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Generation, evolution, and observations of cosmological magnetic fields

29 April 2024 to 7 June 2024
Bernoulli Center
Europe/Zurich timezone

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  1. 96. Welcome and registration
    29/04/2024, 09:30
  2. 31. Sterile Neutrino Dark Matter and Magnetic Fields
    Mikhail Shaposhnikov (EPFL)
    29/04/2024, 10:30

    I will discuss how the Abelian part of the electroweak anomaly can influence the generation of lepton asymmetry of the Universe and its impact on dark matter sterile neutrino.

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  3. 40. Scenarios of inflationary magnetogenesis
    Lorenzo Sorbo (Univesity of Massachusetts, Amherst)
    29/04/2024, 11:30

    In this talk I will review the motivation behind the idea that the cosmic magnetic fields observed today were originated in some dynamics that occurred during inflation. I will then discuss the pros and cons of some of the most popular among these scenarios of inflationary magnetogenesis, with a particular focus on the role that might be played, in this context, by axionic degrees of freedom

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  4. 10. Imprints of primordial curvature perturbations on inflationary magnetic fields
    Rajeev Kumar Jain
    29/04/2024, 14:00

    We examine the imprints of sharp departures from slow-roll inflation which lead to strong features in the scalar power spectra, on the spectra of the primordial electromagnetic fields generated during inflation. In particular, we find that an epoch of ultra-slow roll inflation leads to a severe suppression of the magnetic field spectrum over large scales. We also make use of the code magcamb...

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  5. 99. Welcome reception
    29/04/2024, 18:00
  6. 33. Symmetry breaking and magnetic fields
    Tanmay Vachaspati (Arizona State University)
    30/04/2024, 11:30

    TBA

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  7. 37. Simulating the Early Universe
    Paul Saffin (Nottingham University)
    30/04/2024, 14:00

    One approach to exploring the dynamical properties of systems is to use computer simulations, and these can take many different forms depending on the energy scales and length scales of interest. In this talk I shall give an overview of some techniques for real-time simulations of the underlying fields. This allows one to examine some of the microscopic processes underlying the development of...

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  8. 3. Vacuum Energy of the Universe, Large scale magnetic field and nontrivial topology in QCD.
    Prof. Ariel Zhitnitsky (University of British Columbia)
    30/04/2024, 15:00

    We discuss a new scenario for early cosmology when the de Sitter phase emerges dynamically.
    This genuine quantum effect occurs as a result of dynamics of the topologically nontrivial sectors in a strongly coupled QCD in an expanding universe.
    We argue that the key element for this idea to work is the presence of nontrivial holonomy in strongly coupled gauge theories. The effect is...

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  9. 42. The Non-linear early Universe
    Daniel Figueroa (IFIC Valencia)
    01/05/2024, 10:30

    We review "Lattice Cosmology" techniques as a method to solve non-linear dynamics of interactive fields in an expanding Universe. As a demonstration we apply these ideas to solve two different problems of early Universe cosmology: i) the non-linear dynamics of axion inflation when backreaction of the produced gauge field becomes relevant, and ii) gravitational wave emission from (global and...

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  10. 41. Statistical Mechanics of the Universe
    Jürg Fröhlich (ETH Zurich)
    01/05/2024, 11:30

    To start with I summarize some key puzzles of cosmology to be clarified in the future. I then briefly sketch how to describe the geometry and the state of matter in the Universe after its inflationary era. The main part of my talk is devoted to describing possible mechanisms for the generation of primordial magnetic fields in the Universe. These mechanisms are based on the chiral magnetic...

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  11. 38. Particle production by axion-like particles
    Valerie Domcke (CERN)
    01/05/2024, 14:00

    Axion-like particles may play a key role in early universe cosmology. In this talk I discuss the dual production of gauge fields and fermions induced by axion-like particles, and its implications for magnetogenesis from axion inflation.

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  12. 15. Magnetogenesis and baryogenesis in pseudoscalar inflation
    Kohei Kamada (Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences)
    01/05/2024, 15:00

    Pseudoscalar inflation with Chern-Simons coupling to U(1) gauge fields generates helical magnetic field during inflation. If this U(1) gauge field is the Standard Model U(1) hypergauge interaction, the baryon (or B+L) asymmetry is generated at the same time through the chiral anomaly in a way that the total chirality vanishes. We could expect that it explains the present Baryon Asymmetry of...

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  13. 43. Primordial Magnetic Fields from Preheating at the Electroweak Scale
    Juan Garcia-Bellido (Universidad Autonoma de Madrid)
    02/05/2024, 10:30

    TBA

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  14. 36. Magnetic fields effects on particle interactions strength in the early universe
    Gabriella Piccinelli (UNAM)
    02/05/2024, 11:30

    Motivated by our work on inflationary scenarios in presence of magnetic fields, we have focused on one of the puzzling features with which we have faced: the effect of magnetic fields on the particles’ interaction processes, which may be a relevant issue during inflation or in the subsequent stages of the Universe evolution. The importance of magnetic fields’ contribution comes from the fact...

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  15. 75. Magnetogenesis form axion-U(1) preheating
    Evangelos Sfakianakis (Case Western Reserve U.)
    02/05/2024, 14:00

    I will review the numerical results that demonstrate efficient preheating of an axion-inflaton to photons and the prospects for magnetogenesis. I will also discuss possible correlated observables and possible connections to SM and BSM physics.

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  16. 32. Backreaction from magnetic fields generated during inflation
    Ruth Durrer (University of Geneva)
    02/05/2024, 15:00

    In this talk I shall discuss how magnetic fields generated during inflation can back-react on the inflaton perturbation spectrum. I shall first outline the problem and present the generic form of the equations which have to be solved. I shall then discuss the effects which have been neglected in previous work. I can also outline an example which will be discussed in detail by another speaker...

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  17. 13. Gravitational Waves from Chiral Plasma Instability in Standard Cosmology
    Andrew Long (Rice University)
    03/05/2024, 10:30

    In the primordial plasma, at temperatures above the scale of electroweak symmetry breaking, the presence of chiral asymmetries is expected to induce the development of helical hypermagnetic fields through the phenomenon of chiral plasma instability. It results in magnetohydrodynamic turbulence due to the high conductivity and low viscosity and sources gravitational waves that survive in the...

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  18. 19. Charge transfer induced by chiral plasma instability
    Kyohei Mukaida (KEK)
    03/05/2024, 11:30

    It is well known that the weak sphaleron exchanges chemical potentials of left-handed fermions and plays important roles in baryogenesis. In this talk, we will focus on another source of $B+L$ violation, i.e., $U(1)_Y$ Chern-Pontryagin density. We discuss several examples where the charge transfer induced by this term plays a central role in the early Universe.

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  19. 44. How's Schwinger effect affect primordial Magnetogenesis?
    Tomohiro Fujita (Waseda University)
    03/05/2024, 14:00

    The Schwinger effect is a non-perturbative phenomenon in QED in which an electric field stronger than a certain strength decays into charged particle pairs. In primordial magnetogenesis, especially in inflationary magnetogenesis, the Schwinger effect can drastically change the dynamics of the electromagnetic fields and significantly alter theoretical predictions. However, until recently this...

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  20. 9. Evolution of Cosmological Magnetic Fields from Early to Late Times
    Tina Kahniashvili
    06/05/2024, 10:45

    The physics of primordial magnetic fields can be broken down into three main motifs that are addressed: the generation of a magnetic field in the early universe, the evolution of this magnetic fields subject to
    magnetohydrodynamic (MHD) effects through the various cosmological epochs, and the detection and/or probing of this magnetic field with a comprehensive array of astrophysical and...

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  21. 4. Magnetogenesis from axion-SU(2) inflation
    Oksana Iarygina (Nordita)
    06/05/2024, 11:45

    The origin and maintenance of magnetic fields is an outstanding question of modern cosmology and astrophysics. Dynamo and compression mechanisms during gravitational collapse accompanying the structure formation can only amplify existing magnetic fields, but cannot explain their genesis. The need for a “seed” field motivates the investigation of primordial origin of magnetic fields. The search...

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  22. 34. Cosmological Seed Magnetic Field from Inflation
    Bharat Ratra (Kansas State University)
    07/05/2024, 10:45

    A cosmological magnetic field of nG strength on Mpc length scales could be the seed magnetic field needed to explain observed few microG large-scale galactic magnetic fields. I first briefly review the observational and theoretical motivations for such a seed field, two galactic magnetic field amplification models, and some non-inflationary seed field generation scenarios. I then discuss an...

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  23. 25. Magnetogenesis from vorticity in the primordial universe
    Gaurav Mukherjee (Bhabha Atomic Research Centre, Homi Bhabha National Institute)
    07/05/2024, 11:45

    I explore the speculation that a physical mechanism underlying primordial magnetogenesis could arise from the vorticity field in the quark-gluon plasma (QGP) phase of the early universe. This possibility is motivated by the recent discovery of giant rotating filaments connecting the cosmic web in the large scale structure (P. Wang et al., Possible observational evidence for cosmic filament...

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  24. 68. Primordial magnetogenesis from electroweak dumbbells
    Teerthal Patel
    08/05/2024, 11:00

    The “electroweak dumbbell” consists of a magnetic monopole and an antimonopole of the standard electroweak model connected by a string made of Z−magnetic field. We have scrutinized the structure of static electroweak dumbbells using “constrained relaxation” for a range of separations and twists, and find that dumbbells with a twist have a novel magnetic field structure. Using the relaxed field...

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  25. 74. Fluid and Magnetic Spectra in First-Order Phase Transitions
    Antonino Midiri (University of Geneva)
    08/05/2024, 11:45

    First-Order Phase Transitions in the early universe can be an important source for a Stochastic Gravitational Wave Background (SGWB). All particle sectors can contribute to it: the scalar sector through quantum fluctuations and collision of true vacuum bubbles, the fermionic sector, usually considered within a fluid description, through fluid longitudinal perturbations leading, after bubble...

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  26. 1. Lattice Simulations of Axion-U(1) Inflation
    Angelo Caravano
    09/05/2024, 11:00

    I will present the first nonlinear lattice simulation of an axion field coupled to a U(1) gauge field during inflation. The Chern-Simons coupling induces a tachyonic growth of one of the two helicities of this electromagnetic inflationary field, often invalidating the standard perturbation theory approach. We use the simulation to study the production of the gauge field on the lattice and its...

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  27. 27. Stochastic effects and Primordial magnetogenesis
    Alireza Talebian Ashkezari
    09/05/2024, 11:45

    In this talk, I delve into the intricacies of primordial magnetogenesis during inflation, incorporating a thorough consideration of the dynamics of stochastic noises associated with electromagnetic perturbations. By deriving the Langevin and Fokker-Planck equations governing the evolution of electromagnetic fields, I achieve analytical solutions. Our investigation reveals that, although the...

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  28. 104. General Relativistic Entropic Acceleration (GREA): Dark Energy from First Principles
    Juan Garcia-Bellido (Universidad Autonoma de Madrid)
    09/05/2024, 14:00
  29. 100. On adiabatic renormalization and Gauge invariant backreaction in U(1)-axion inflation
    Pietro Conzinu (CERN/INFN Pisa)
    10/05/2024, 11:00

    I describe a new approach to renormalize physical quantities in curved space-time introducing a comoving infrared cut-off in defining the adiabatic counterpart of the physical quantity under consideration. This infrared cut-off is fundamental to avoid unphysical divergences that can be generated by a pathological behavior of the adiabatic subtraction extended to the infrared domain. Applying...

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  30. 71. Scalar perturbations from inflationary magnetogenesis
    Deepen Garg (Princeton University)
    10/05/2024, 11:45

    Primordial non-Gaussianities, though yet unobserved, remain an important observable since they can help differentiate various models of inflation. This necessitates a deep understanding of the various processes that could contribute to these non-Gaussianities, with inflationary magnetogenesis being one of them. Often, the spectrum and the bispectrum of the perturbations produced during...

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  31. 97. Welcome
    13/05/2024, 10:00
  32. 45. Numerical simulations from reheating to turbulent MHD
    Axel Brandenburg (Nordita)
    13/05/2024, 10:30

    TBA

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  33. 46. Production of chiral anomaly, dynamo instabilities and generation of turbulence
    Igor Rogachevskii (Ben-Gurion University of the Negev)
    13/05/2024, 11:30

    The standard model of particles predicts the occurrence of a macroscopic quantum phenomenon named the chiral magnetic effect (CME) in plasmas with chiral, electrically charged particles. The CME implies an electric current along a magnetic field, which arises if there is an asymmetry in the chemical potentials of left- and right-handed fermions related to a chiral anomaly. This effect can be...

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  34. 52. Challenges in understanding primordial magnetic fields and its evolution (remote)
    Kandaswamy Subramanian (IUCAA, Pune and Ashoka University, Sonipat)
    13/05/2024, 14:00

    TBA

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  35. 16. Exploring the PMF imprints through rotation measure in the rarified cosmic regions
    Salome Mtchedlidze (University of Bologna, Ilia State University)
    13/05/2024, 15:00

    Faraday rotation of linearly polarized emission as light passes through the foreground magnetised medium is one of the powerful indirect probes of the large-scale magnetic fields (LSMFs). Rotation measure (RM) which quantifies the amount of the rotation of the polarisation plane has been used for reconstructing the magnetic field properties in the intracluster medium. In the recent years,...

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  36. 101. Welcome reception
    13/05/2024, 18:00
  37. 53. PMFs and their density perturbations through recombination
    Pranjal Trivedi (University of Hamburg)
    14/05/2024, 10:30

    TBA

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  38. 55. Magnetic reconnection in the early Universe
    David Hosking (Princeton University)
    14/05/2024, 11:30

    TBA

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  39. 29. Magnetic fields in galaxy clusters
    Paola Dominguez Fernandez
    14/05/2024, 14:00

    Galaxy clusters host Mpc-scale diffuse radio emission giving us evidence of large-scale magnetic fields in the Universe. Among the potential explanations for the observed magnetic fields in these clusters are primordial magnetic fields (PMFs). There are two main theories for primordial magnetogenesis: those formed during inflation and those created during phase transitions. In my talk, I will...

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  40. 7. Dark matter minihalos from primordial magnetic fields
    Pranjal Ralegankar
    14/05/2024, 14:45

    Primordial magnetic fields (PMF) can enhance baryon perturbations on scales below the photon mean free path. However, a magnetically driven baryon fluid becomes turbulent near recombination, thereby damping out baryon perturbations below the magnetic Jeans length. In this Letter, we show that the initial growth in baryon perturbations gravitationally induces growth in the dark matter...

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  41. 8. Structure Formation with Primordial Magnetic Fields: enhancing baryon fraction in halos
    Mak Pavičević (SISSA (International School for Advanced Studies), INFN-Trieste)
    14/05/2024, 15:30

    Primordial magnetic fields (PMFs) can enhance matter power spectrum on small scales ($\lesssim$ Mpc) and still agree with bounds from cosmic microwave background (CMB) and Faraday rotation measurements. As modes on scales smaller than Mpc have already become non-linear today, constraints on PMFs from the impact on small-scale structures require dedicated cosmological simulations. Here, for the...

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  42. 49. Cosmic Recombination in the Presence of Primordial Magnetic Fields (remote)
    Karsten Jedamzik (University of Montpellier)
    15/05/2024, 10:30

    Primordial magnetic fields (PMFs) may explain observations of magnetic fields on extragalactic scales. They are most cleanly constrained by observations of details of the cosmic microwave background radiation (CMB). Their effects on cosmic recombination may even be at the heart of the resolution of the Hubble tension. Employing detailed MHD- and Monte-Carlo- simulations we present an analysis...

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  43. 47. Primordial Magnetic Fields, CMB and the Hubble tension
    Levon Pogosian (Simon Fraser University)
    15/05/2024, 11:30

    A stochastic primordial magnetic field (PMF), if present in the plasma prior to last scattering, would induce baryon inhomogeneities and speed up cosmic recombination. The consequently smaller sound horizon at last scattering, along with more subtle changes in recombination history, have a significant impact on the observed cosmic microwave background (CMB) temperature and polarization, and...

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  44. 26. Small scale baryons fluctuations from causal primordial magnetic fields
    Fabio Finelli
    15/05/2024, 14:00

    We compute the enhancement of baryon density fluctuations sourced by a stochastic background of primordial magnetic fields by means of an Einstein-Boltzmann code which evolves the full system for cosmological perturbations and computes the cosmic microwave background anisotropy temperature and polarization power spectra.

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  45. 69. Rethinking Recombination: Primordial Magnetic Fields and the Hubble tension
    Jonathan Schiff (University of California Santa Barbara)
    15/05/2024, 15:00

    Perhaps the most significant challenge to the widely successful Lambda-CDM theory is the disagreement between late and early Universe measurements of the present day Hubble expansion rate (H0), referred to as the Hubble tension. One of the ways to resolve the Hubble tension is to modify the recombination history of the early universe. An intriguing proposal to realize this invokes primordial...

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  46. 22. Cosmological simulations including magnetic fields and realistic feedback from galaxies
    Matthieu Schaller
    16/05/2024, 10:30

    We use the FLAMINGO model of galaxy formation to study the cosmological evolution of primordial magnetic fields. This model was calibrated, using machine-learning techniques, to reproduce key observables of the galaxy and cluster population. This gives strong constraints on the feedback mechanisms around haloes and, as a consequence, on the spatial regions where magnetic field sourced in...

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  47. 48. Modeling the galactic dynamo in the cosmological context
    Romain Teyssier (Princeton University)
    16/05/2024, 11:30

    TBA

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  48. 50. Magnetism footprints in cosmological envirnments
    Federico Stasyszyn (IATE / OAC)
    16/05/2024, 14:00

    TBA

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  49. 28. Probing high-frequency gravitational waves in cosmic magnetic fields
    Yutong He (Nordita & Stockholm University)
    16/05/2024, 15:00

    High-frequency gravitational waves (HFGWs), loosely defined as above kHz, could stem from new physics, e.g., light primordial black holes, beyond-Standard Model mechanisms. One approach to detect such HFGWs is via the inverse Gertsenshtein effect, where gravitons convert to photons in an external magnetic field. Since magnetic fields are ubiquitous in the universe, such graviton-photon...

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  50. 60. CR propagation in intermittent magnetic fields
    Michael Kachelriess (NTNU Trondheim)
    17/05/2024, 11:30

    TBA

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  51. 17. Magnetic dynamo in SWIFT simulations
    Nikyta Shchutskyi (Leiden University)
    17/05/2024, 14:00

    Dynamos and astrophysical magnetic field (MF) evolution can be studied with numerical simulations.
    There is an ongoing effort to implement cosmological MFs evolution in SWIFT code using smoothed particle hydrodynamics (SPH) for the first time. The code contains several implementations: solve direct induction equations or evolve vector potential. Having different implementations might help to...

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  52. 23. Very large magnetohydrodynamical simulations of structure formation with the cosmological code SWIFT
    Orestis Karapiperis
    17/05/2024, 14:45

    Numerical simulations can substantially support the study of the origin and evolution of cosmic magnetic fields. Leveraging on algorithmic advances at the heart of the novel cosmological code SWIFT, and developing a suite of Modern Lagrangian Magnetohydrodynamical (MHD) Solvers - each with a different formulation of Ideal and Resistive MHD - we seek to make predictions for the large-scale...

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  53. 14. Magnetic field seeds from black holes accretion disks
    Mr Patricio Colazo (IATE - Córdoba, Argentina)
    17/05/2024, 15:30

    The origin and evolution of cosmological magnetic fields not only remains a subject that is still unresolved, it also has the potential to serve as a test for current cosmological models. This talk focuses on investigating different magnetic field seeds and explores potential origins involving black holes with charge, amplification processes, and distribution mechanisms on large...

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  54. 81. Introduction
    Alberto Roper Pol (Universite de Geneve (CH)), Jennifer Waltraud Schober
    21/05/2024, 09:30
  55. 76. Theory lecture 1a. Fluid dynamics
    Jennifer Waltraud Schober
    21/05/2024, 10:30
  56. 77. Theory lecture 1b. Fluid dynamics
    Jennifer Waltraud Schober
    21/05/2024, 13:30
  57. 78. Practice session 1. Sound waves
    Jennifer Waltraud Schober
    21/05/2024, 16:30
  58. 79. Theory lecture 2. MHD
    Alberto Roper Pol (Universite de Geneve (CH))
    22/05/2024, 09:30
  59. 82. Practice session 2a. MHD waves
    Alberto Roper Pol (Universite de Geneve (CH))
    22/05/2024, 11:30
  60. 94. Practice session 2b. MHD waves
    Alberto Roper Pol (Universite de Geneve (CH))
    22/05/2024, 13:30
  61. 80. Theory lecture 3. Turbulence
    Jennifer Waltraud Schober
    22/05/2024, 14:30
  62. 83. Practice session 3. Driven turbulence
    Jennifer Waltraud Schober
    22/05/2024, 17:30
  63. 84. Lecture 5. Cosmology
    Alberto Roper Pol (Universite de Geneve (CH))
    23/05/2024, 09:30
  64. 85. Lecture 6a. MHD in an expanding universe
    Alberto Roper Pol (Universite de Geneve (CH))
    23/05/2024, 10:30
  65. 103. Pencil Code office hours
    23/05/2024, 13:00
  66. 86. Lecture 6b. MHD in an expanding universe
    Alberto Roper Pol (Universite de Geneve (CH))
    23/05/2024, 14:00
  67. 87. Practice session 4. MHD decaying turbulence
    Alberto Roper Pol (Universite de Geneve (CH))
    23/05/2024, 16:30
  68. 88. Lecture 7. Magnetic chiral dynamo
    Jennifer Waltraud Schober
    24/05/2024, 09:30
  69. 90. Practice session 5. Chiral dynamo
    Jennifer Waltraud Schober
    24/05/2024, 11:30
  70. 95. Practice session 5. Chiral dynamo
    Jennifer Waltraud Schober
    24/05/2024, 13:30
  71. 89. Lecture 8. Gravitational waves
    Alberto Roper Pol (Universite de Geneve (CH))
    24/05/2024, 14:30
  72. 91. Practice session 6. Gravitational waves
    Alberto Roper Pol (Universite de Geneve (CH))
    24/05/2024, 17:30
  73. 98. Welcome
    27/05/2024, 10:00
  74. 58. Multimessenger constraints on intergalactic magnetic fields: quo vadis?
    Rafael Alves Batista (Instituto de Física Teórica UAM-CSIC, Universidad Autónoma de Madrid)
    27/05/2024, 10:30

    Recently, there has been a burgeoning interest in the exploration of intergalactic magnetic fields (IGMFs) through the use of multiple astrophysical messengers. In fact, this has prominently featured as a primary science case of gamma-ray and (ultra-high-energy) cosmic-ray observatories. While numerous studies have derived bounds on IGMFs, many of these results have been obtained under...

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  75. 64. CRPropa 3.2 - a public framework for high-energy astroparticle simulations
    Andrey Saveliev
    27/05/2024, 11:30

    In this contribution, we introduce CRPropa 3.2, a Monte Carlo framework revolutionizing the simulation of (ultra-)high-energy particle propagation in the Universe. Encompassing cosmic rays, gamma rays, electrons, and neutrinos across a vast energy spectrum, from ZeV to GeV for gamma rays and electrons, and TeV for cosmic rays and neutrinos, CRPropa 3.2 represents a significant leap towards a...

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  76. 65. CMB spectral distortions meet PMFs
    Jens Chluba (JBCA)
    27/05/2024, 14:00

    CMB spectral distortions provide a new window to early-universe and particle physics. This opens new ways to constrain the amplitude of fluctuations at small scales and also during the cosmological recombination era. In my talk, I will highlight some of the exciting opportunities for constraining the effects of PMFs on the CMB spectrum and how this might allow us to shed new light on the...

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  77. 102. Welcome reception
    27/05/2024, 18:00
  78. 39. Hints of magnetic helicity in the gamma-ray background?
    Francesc Ferrer (Washington University in Saint Louis)
    28/05/2024, 10:30
  79. 67. Probing the intergalactic magnetic field through gamma-ray observations
    Manuel Meyer (University of Southern Denmark)
    28/05/2024, 11:30

    Magnetic fields in galaxies and galaxy clusters are believed to be the result of the amplification of seed fields during structure formation. However, the origin of this intergalactic magnetic field (IGMF) remains unknown. Observations of high-energy gamma rays from distant sources offer an indirect probe of the IGMF. Gamma-rays interact with the extragalactic background light to produce...

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  80. 66. IceCube/CTAO
    Teresa Montaruli (University of Geneva)
    28/05/2024, 14:00

    TBA

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  81. 61. Searching for Primordial Magnetism in the Cosmic Microwave Background with LiteBIRD (remote)
    Daniela Paoletti (INAF-OAS Bologna and INFN-Bologna)
    29/05/2024, 10:30

    LiteBIRD will map the Cosmic Microwave Background polarization on the whole sky with unprecedented accuracy, opening a whole new world of opportunities in cosmology. One of these is the study of primordial magnetism. In particular, the combination of the many signatures in CMB polarization of primordial magnetic fields and the sensitivity and cleanness of LiteBIRD data will enable the study...

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  82. 18. Connecting the observed and simulated cosmic web to primordial magnetism
    Franco Vazza (Università di Bologna)
    29/05/2024, 11:30

    I will show how the development of new simulations, jointly with the latest extragalactic radio surveys are giving us a deep and new view of cosmic magnetism on scales never probed so far. Jointly with other probes from different wavelengths, they have started producing seemingly consistent constraints on the presence of very diffuse magnetic fields on the largest scales in the Universe,...

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  83. 62. Observations of Magnetic Fields in the Large Scale Structure of the Universe (remote)
    Valentina Vacca (INAF - OAC)
    29/05/2024, 14:00

    Precious information about the history of cosmological magnetic fields comes from their observation in the large scale structure of the Universe. Diffuse synchrotron emission represents a powerful tool to constrain the strength and geometry of the magnetic fields in clusters and in filaments of the cosmic web. A complementary probe is the Faraday effect on the signal of background radio...

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  84. 73. Multi-messenger signatures of cosmological magnetic fields
    Dmitri Semikoz (APC)
    30/05/2024, 10:30

    In this talk I’ll review recent developments in the measurements of intergalactic magnetic fields in the voids of large scale structure with gamma-ray telescopes and by ultra-high energy cosmic ray detectors.

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  85. 59. Cosmic magnetic field probes with electromagnetic cascades and cosmic rays
    Günter Sigl (University of Hamburg)
    30/05/2024, 11:30

    Weak relic magnetic fields produced in the early Universe can be probed through their influence on electromagnetic cascades in the relatively pristine environment of cosmic voids. Such electromagnetic cascades are initiated by powerful blazars and lead to gamma-ray spectra from GeV to TeV energies whose spectrum at Earth that are sensitive to cosmic magnetic fields, but also to pair beam...

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  86. 70. Efficient subsonic turbulent dynamo during cosmic RD era
    Pranjal Trivedi (University of Hamburg)
    30/05/2024, 14:00

    TBA

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  87. 2. Cosmological-scale magnetic fields from galactic outflows
    Kyrylo Bondarenko (Cosmological-scale magnetic fields from galactic outflows)
    30/05/2024, 14:45

    We study the effects of galaxy formation physics on the magnetization of the intergalactic medium (IGM) using the IllustrisTNG simulations. We demonstrate that large-scale regions affected by the outflows from galaxies and clusters contain magnetic fields that are several orders of magnitude stronger than in unaffected regions with the same electron density. Moreover, like magnetic fields...

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  88. 56. Probing primordial magnetic fields with 21 cm line observations
    Kerstin Kunze (Universidad de Salamanca)
    31/05/2024, 10:30

    TBA

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  89. 57. New Models of the Coherent Galactic Magnetic Field
    Michael Unger (Karlsruhe Institute for Technology)
    31/05/2024, 11:30

    Galaxies are known to be permeated by large-scale magnetic fields with energy densities comparable to the turbulent and thermal energy densities of the interstellar medium. A good knowledge of the global structure of these fields is important to understand their origin and to infer their effect on galactic dynamics and the propagation of charged particles in galaxies. In this talk I will...

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  90. 20. Constraints on extragalactic magnetic fields from ultra-high-energy cosmic rays
    Arjen van Vliet (Khalifa University)
    31/05/2024, 14:00

    Ultra-high-energy cosmic rays (UHECRs) get deflected by extragalactic magnetic fields (EGMFs) when they propagate from their sources to Earth. The spread of UHECRs around their original source position provides a measure for the strength of the EGMFs in between the UHECR sources and Earth. Furthermore, the density of UHECR sources plays an essential role in determining the relative...

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  91. 21. Role of space plasma instabilities in blazar probes of the intergalactic magnetic field
    Oindrila Ghosh (Stockholm University & the Oskar Klein Centre)
    03/06/2024, 11:45

    Prompt emissions from TeV blazars pair produce on the extragalactic background light and the resulting e+e- pairs then undergo inverse Compton scattering, giving rise to secondary gamma-rays. The non-observation of such reprocessed emission implies a suppression of cascades from TeV blazars. In addition to the deflection of the pairs away from the line of sight by the intergalactic magnetic...

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  92. 72. PMFs from Double Inflation
    Kosar Asadi (Institute for Research in Fundamental Sciences (IPM))
    04/06/2024, 11:45

    We study the helical magnetic fields during an inflationary period, which
    is the result of the tachyonic growth of the gauge field. We consider double inflation
    model and solve the electromagnetic dynamics. We find that magnetic fields with
    amplitude 𝐵 ≈ 10−23 𝐺 at present can be generated, which can be considered as
    magnetic seed for the magnetic field observed in galaxies.

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  93. 12. Constraining inflationary magnetogenesis and reheating via GWs in light of PTA data
    SUBHASIS MAITI
    05/06/2024, 11:45

    Recent advancements in our observation of the cosmos have led to significant progress. However, we still lack a complete understanding of the dynamics involved in the reheating process after cosmic inflation. Gaining a deep understanding of reheating dynamics is crucial for deciphering the unfolding story of our universe. It is essential for reheating to conclude before the Big Bang...

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  94. 93. Coffee break
  95. 92. Lunch break