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Physics of the Early Universe

→ Europe/Zurich
Mikhail Shaposhnikov, Andrey Shkerin (University of Minnesota), Inar Timiryasov (University of Copenhagen), Sebastian Zell (EPFL - Ecole Polytechnique Federale Lausanne (CH))
Description

Online Workshop "Physics of the Early Universe"

This is an online workshop about physics of the early Universe. Topics include in particular:

  • Quantum cosmology
  • Inflation
  • Preheating
  • Primordial black holes
  • Primordial gravitational waves
  • Leptogenesis
  • Big Bang nucleosynthesis
  • Dark matter
  • Phase transitions and vacuum decay

 

The workshop takes place from Monday, June 13, to Friday, June 17, and mostly follows Central European Time. The schedule will be slightly irregular to accommodate the needs of speakers from various timezones. If you want to attend as a listener, we ask you to register by June 10 at the latest. Access to the workshop will only be possible for registered participants. There is no registration fee.

The workshop is organized by

  • Mikhail Shaposhnikov (École Polytechnique Fédérale de Lausanne)
  • Andrey Shkerin (Minnesota University)
  • Inar Timiryasov (Niels Bohr Institute, University of Copenhagen)
  • Sebastian Zell (École Polytechnique Fédérale de Lausanne)
schedule_early_universe_2022.pdf
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Participants
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  • Monday 13 June
    • 10:10 → 10:20
      Opening 10m
    • 10:20 → 11:00
      Starting the Universe from strong gravity regime 40m
      Speaker: Valery Rubakov (Institute for Nuclear Research of RAS)
      cosmoworkshop-jun2022.pdf
    • 11:00 → 11:40
      A de-Sitter no-hair theorem for spacetimes with isometry group forming two-dimensional orbits 40m
      Speaker: Leonardo Senatore
    • 11:40 → 12:20
      New boundary conditions for cosmology 40m
      Speaker: Neil Turok
      EUShort.pdf
    • 12:20 → 14:00
      Lunch 1h 40m
    • 14:00 → 14:40
      From Wormholes and Baby Universes to Inflation and the Measure Problem 40m
      Speaker: Arthur Hebecker
      Hebecker.pdf
    • 14:40 → 15:20
      Gravity and Axion 40m
      Speaker: Gia Dvali
      gia_talk_axiongravity_June_13_22.pdf
    • 15:20 → 16:00
      Quantum gravity from the beginning to the present Universe 40m
      Speaker: Christof Wetterich
      QG beginning to present_EarlyUniverse0622.pdf
    • 16:00 → 16:30
      Coffee break 30m
    • 16:30 → 17:10
      Gravitational wave production in non-local Starobinsky model 40m
      Speaker: Anna Tokareva
      Tokareva_EPFL.pdf
    • 17:10 → 17:50
      Path integrals in some 2D and 4D quadratic gravity models 40m
      Speaker: Vladimir Belokurov
      Belokurov_Talk_Phys_Earl_Univ.pdf
  • Tuesday 14 June
    • 10:20 → 11:00
      Field redefinitions, perturbative unitarity, and Higgs inflation 40m
      Speaker: Georgios Karananas
      2022_ONLINE_WSHOP.pdf
    • 11:00 → 11:40
      Higgs inflation as a door to gravity 40m
      Speaker: Syksy Räsänen
      higgs_gravity_Rasanen.pdf
    • 11:40 → 12:20
      Scale symmetry, the Higgs and the Nature of Gravity 40m
      Speaker: Javier Rubio
      JavierRubio_EC.pdf
    • 12:20 → 14:00
      Lunch 1h 40m
    • 14:00 → 14:40
      IR effects in de Sitter and in Inflation 40m
      Speaker: Victor Gorbenko
      IR 2022.pdf
    • 14:40 → 15:20
      Bootstrapping large graviton non-Gaussianities 40m

      Gravitational interferometers and cosmological observations of the cosmic microwave background offer us the prospect to probe the laws of gravity in the primordial universe. To study and interpret these datasets we need to know the possible graviton non-Gaussianities. To this end, we derive the most general tree-level three-point functions (bispectra) for a massless graviton to all orders in derivatives, assuming scale invariance. Instead of working with explicit Lagrangians, we take a bootstrap approach and obtain our results using the recently derived constraints from unitarity, locality and the choice of vacuum. Since we make no assumptions about de Sitter boosts, our results capture the phenomenology of large classes of models such as the effective field theory of inflation and solid inflation. We present formulae for the infinite number of parity-even bispectra. Remarkably, for parity-odd bispectra, we show that unitarity allows for only a handful of possible shapes: three for graviton-graviton-graviton, three for scalar-graviton-graviton and one for scalar-scalar-graviton, which we bootstrap explicitly. These parity-odd non-Gaussianities can be large, for example in solid inflation, and therefore constitute a concrete and well-motivated target for future observations.

      Speaker: Enrico Pajer
      Workshop_Jun_2022.pdf
    • 15:20 → 16:00
      Fundamental Physics from Galaxy Surveys 40m

      The distribution of galaxies on large scales is a sensitive probe of cosmological physics. In particular, the structure of this distribution depends on properties of dark matter and the dynamics of the early universe. Understanding this dependence, however, is a challenging task because the observed galaxy distribution is modulated by a variety of non-linear effects. I will present theoretical tools that have allowed for a systematic analytic description of these effects. These tools play a central role in a new program of extracting cosmological information from galaxy surveys. I will share some results of this program from my independent analysis of the public data from the Baryon acoustic Oscillation Spectroscopic Survey. These results include the measurement of the Hubble constant as well as constraints on new physics and the early Universe.

      Speaker: Mikhail Ivanov
    • 16:00 → 16:30
      Coffee break 30m
    • 16:30 → 17:10
      Generation of peaks in primordial perturbation spectra due to variable number of slow-roll inflatons 40m
      Speaker: Alexei Starobinsky
      Physics-Early-Universe-June-2022.pdf
    • 17:10 → 17:50
      Cosmological attractors after Planck/BICEP/Keck 40m
      Speaker: Andrei Linde
      BKInflation0614.pdf
  • Wednesday 15 June
    • 10:20 → 11:00
      Aspects of High Scale Leptogenesis with Low Energy CP Violation 40m
      Speaker: Serguey Petcov
    • 11:00 → 11:40
      Resonant Leptogenesis 40m
      Speaker: Björn Garbrecht
      LeptogenesisJune22-1.pdf
    • 11:40 → 12:20
      Testable scenarios of leptogenesis 40m
      Speaker: Marco Drewes
      Drewes_PhysicsEarlyUnivers_OverlayRemoved.pdf
    • 12:20 → 14:00
      Lunch 1h 40m
    • 14:00 → 14:40
      2PI-approach to particle production and phase transition dynamics 40m
      Speaker: Kimmo Kainulainen
      Quark2022.pdf
    • 14:40 → 15:20
      CosmoLattice: The Art of Simulating the Early Universe 40m
      Speaker: Daniel Figueroa
      DaniFigueroa_EarlyUniverseEPFL_2022.pdf
    • 15:20 → 16:00
      Lattice simulations of inflation and reheating 40m
      Speaker: Kaloian Lozanov
      KaloianLozanov2022PhysicsOfTheEarlyUniverseWorkshop40minsPDF.pdf
    • 16:00 → 16:30
      Coffee break 30m
    • 16:30 → 17:10
      Gravitation portals and particle production during inflationary reheating 40m
      Speaker: Keith Olive
      GravPortEU.pdf
    • 17:10 → 17:50
      Small-scale structure in vector dark matter 40m
      Speaker: Mustafa Amin
    • 17:50 → 18:30
      Vacuum Energy of the Universe, Large scale magnetic field and nontrivial topology in Quantum Field Theory 40m
      Speaker: Ariel Zhitnitsky
      Zhitnitsky.pdf
  • Thursday 16 June
    • 10:20 → 11:00
      Lorentzian Description of the 1st Order Phase Transition 40m
      Speaker: Kohei Kamada
      Kamada.pdf
    • 11:00 → 11:40
      Primordial Black Holes and Vacuum Decay 40m
      Speaker: Ruth Gregory
      PhysEarlyU.pdf
    • 11:40 → 12:20
      Cosmological implications of Higgs vacuum metastability 40m
      Speaker: Arttu Rajantie
      Rajantie_PEU_2022.pdf
    • 12:20 → 14:00
      Lunch 1h 40m
    • 14:00 → 14:40
      A novel technique for the description of gauge-field production during axion inflation 40m
      Speaker: Oleksandr Sobol
      Sobol_2022.pdf
    • 14:40 → 15:20
      Electroweak model in a strong magnetic field 40m
      Speaker: Maxim Chernodub
      Magnetic_EW_Lattice.pdf
    • 15:20 → 16:00
      Cosmological stochastic gravitational wave backgrounds in LISA 40m
      Speaker: Chiara Caprini
      slides_Chiara_Caprini.pdf
    • 16:00 → 16:30
      Coffee break 30m
    • 16:30 → 17:10
      Probing the scale of grand unification with gravitational waves 40m
      Speaker: Valerie Domcke
      LPPC_workshop_domcke_metastable_strings.pdf
    • 17:10 → 17:50
      Cosmic strings and black holes 40m
      Speaker: Alexander Vilenkin
      BHstrings.2.2022.pdf
  • Friday 17 June
    • 10:20 → 11:00
      The nature of Dark Matter: what can we learn from astrophysical data expected in the next few years 40m
      Speaker: Alexey Boyarsky
    • 11:00 → 11:40
      Dark Matter abundance via thermal decays and leptoquark mediators 40m
      Speaker: Alessandro Strumia
      2022-DMtalks.pdf
    • 11:40 → 12:20
      Primordial black holes and their observational constraints 40m
      Speaker: Kazunori Kohri
    • 12:20 → 14:00
      Lunch 1h 40m
    • 14:00 → 14:40
      Big Bang nucleosynthesis -- new about old 40m
      Speaker: Oleg Ruchayskiy
    • 14:40 → 15:20
      The problem of instability of gravitational baryogenesis and its possible resolution 40m
      Speaker: Elena Arbuzova
      Early-Univ-22-ArbuzovaE.pdf
    • 15:20 → 16:00
      Primordial black holes as dark matter from inflation 40m
      Speaker: Guillermo Ballesteros
      PBHEarlyUnivWorkshop.pdf
    • 16:00 → 16:30
      Coffee break 30m
    • 16:30 → 17:10
      Primordial black holes in the universe and antistars in Milky Way 40m
      Speaker: Alexander Dolgov
      Dolgov-antiquarks-2022.pdf
    • 17:10 → 17:50
      Primordial black holes as dark matter 40m
      Speaker: Alexander Kusenko
      Primordial black holes as dark matter
      Primordial black holes _Physics of the Early Universe_ workshop 2022.pdf
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