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Giorgio Busoni (Adelaide University)7/13/26, 11:00โฏAM
Dark matter (DM) constitutes most of the matter content of the Universe, yet its particle nature remains unknown. While laboratory searches and cosmological probes have placed strong constraints on many candidate models, astrophysical environments provide a complementary avenue to test DM interactions under extreme conditions. Stars are particularly promising laboratories: as they move through...
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Stefan Vogl (University of Freiburg)7/13/26, 11:15โฏAM
Light dark photons can be produced in stellar systems and thus contribute to the stellar cooling rate. The additional cooling changes the evolution of the star and has an impact on various observables properties such as radius, photon luminosity or the emitted neutrino fluxes. This has been exploited before to derive limits based on observations of the Sun and horizontal branch stars. Given...
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Yongchao Zhang7/13/26, 11:30โฏAM
MeV-scale axion-like particles (ALPs) can be produced abundantly in the Sun. The photons from ALP decay could deviate significantly from the original ALP direction, or even from roughly the opposite direction of the Sun. The nontrivial angular and spectral distributions enable us new methods to detect the lights from the darkness. We consider the space detection and terrestrial experiments at...
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30. DarkMatterLive: A Live Framework for Unifying Constraints on Dark Matter and Dark Sector PhysicsDr Brij Kishor Jashal (Rutherford Appleton Laboratory)7/13/26, 11:45โฏAM
Dark matter searches now span a wide range of experimental and observational programmes, from collider and fixed-target experiments to direct detection, indirect searches, and cosmological probes. Yet the resulting constraints are often presented in different variables, conventions, and model assumptions, making it difficult to compare them consistently or to build coherent global pictures of...
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Zachary Picker7/13/26, 3:30โฏPM
It has long been known that if the dark sector includes an attractive Yukawa force, dark halos can readily form, well before matter-radiation equality. However, the same scalar field which mediates the Yukawa force also allows these structures to radiatively cool, causing them to further collapse. I will discuss the evolution of these dark halos as they cool into Fermi balls and even...
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William DeRocco (University of Maryland, College Park)7/13/26, 3:45โฏPM
Primordial black holes (PBHs) are a well-motivated candidate for dark matter that may constitute a sub-fraction of the dark sector in the Earth-mass range. The strongest observational probe of this population is through gravitational microlensing, an effect in which the bending of light by a massive object results in the apparent transient magnification of a distant source. While ground-based...
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Asuka Ito (Kobe University), Kazunori Kohri7/13/26, 4:00โฏPM
Light primordial black holes (PBHs) are viable candidates for dark matter. If they constitute a sizable fraction of dark matter, PBH mergers can occur frequently in the Milky Way Galaxy. The merger remnants are Kerr black holes and hence possess spin. In the presence of a light bosonic field with a Compton wavelength comparable to the black-hole radius, superradiant boson clouds can form...
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Simone D'Onofrio (ICE - CSIC)7/13/26, 4:15โฏPM
Tidal Love numbers (TLNs) encode the deformability of compact objects under external tidal fields and leave observable imprints in gravitational wave signals. While black hole TLNs vanish in vacuum general relativity, the presence of surrounding matter can alter this picture. This talk presents a study of the axial (magnetic) TLNs of a Schwarzschild black hole embedded in a spherically...
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Daeun Jeong (Seoul National University)7/13/26, 4:30โฏPM
Recent weak-lensing measurements reported that circular velocity curves of galaxies remain flat out to ~1 Mpc, potentially posing a tension with the standard ฮCDM model. In this work, we investigate the origin of these extended flat rotation curves using the IllustrisTNG cosmological simulation. We select isolated galaxies from the simulation and construct circular velocity profiles in three...
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Amy Smith (University of Southampton)7/13/26, 4:45โฏPM
High-resolution kinematic measurements of disc galaxies continue to exhibit a persistent mismatch between the observed rotation curves and the distribution of visible components, reinforcing either the necessity for a "dark" matter component or a departure from standard gravitational dynamics in the low-acceleration regime. We present the modelled rotation curves of 115 disc-dominated...
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Dr Sreekanth Harikumar (Nicolaus Copernicus Astronomical Center, Warsaw)7/14/26, 11:30โฏAM
Microlensing surveys targeting the stellar fields of the Magellanic Clouds, the Galactic Bulge, and M31 have long constrained the abundance of Massive Compact Halo Objects (MACHOs) and galactic halo structure. Just as electromagnetic radiation is gravitationally lensed, so too are gravitational waves (GWs) producing repeated or chromatically distorted signals. For short-lived transient sources...
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Zhong Zhang7/15/26, 10:30โฏAM
Self-interacting neutrinos are well-motivated particles in order to solve problems such as Hubble tension in cosmology. Neutrino-philic scalars, such as flavons and Majorons, can be solutions to BSM puzzles, such as lepton number and lepton flavour violations. New muon decay channels (e.g. ยต โ eฯ, ยต โ eฯฯ) will be introduced by neurtino-scalar couplings and ยต โ eฮฝฮฝ will have additional...
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Ruchika Ruchika (Salamanca University)7/15/26, 10:45โฏAM
As next-generation telescopes and observational surveys continue to expand the boundaries of our understanding, tensions and discrepancies between observational datasets are becoming increasingly prominent. In this work, we focus on one such discrepancy: the differences between 2D and 3D Baryon Acoustic Oscillation (BAO) measurements. Without extending beyond the standard $\Lambda$CDM...
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AJAY Kaladharan7/15/26, 11:00โฏAM
Strongly Interacting Massive Particles (SIMPs) provide an intriguing alternative to conventional collisionless dark matter (CDM) scenarios, particularly in light of tensions between CDM predictions and observations on small astrophysical scales. In SIMP models, the observed dark matter relic abundance is generated through self-annihilation processes such asย $3 \to 2$ย orย $4 \to 2$, involving...
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101. Primordial Gravitational Waves as Complementary Probe of Dark Matter Indirect Detection & AxionAnish Ghoshal (University of Sussex)7/15/26, 11:15โฏAM
We propose a novel cosmological probe of dark matter (DM) and QCD Axions through inflationary primordial gravitational wave (GW) measurements highlighting its complementarity with traditional indirect detection. In scenarios like early matter domination (EMD), the thermal DM relic is diluted and then replenished via non-thermal production, leaving characteristic imprints on the primordial GW...
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Dr Rishav Roshan (University of Southampton)7/15/26, 11:30โฏAM
We calculate the gravitational waves (GWs) produced by primordial black holes (PBHs) in the presence of the inflaton condensate in the early Universe. Combining the GW production from the evaporation process, the gravitational scattering of the inflaton itself, and the density fluctuations due to the inhomogeneous distribution of PBHs, we propose for the first time a complete coherent analysis...
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Prof. Asher Yahalom (Ariel University)7/15/26, 3:30โฏPM
Gravity and electromagnetic interactions are the only fundamental physical interactions (outside the nuclear domain). In this work, we shall concentrate on Hamiltonians containing gravitational interaction, which according to general relativity must be retarded. In recent years, retarded gravity has explained many of the mysteries surrounding the โmissing massโ related to galactic rotation...
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Giovani Dalla Valle Garcia (The University of Melbourne)7/15/26, 3:45โฏPM
We investigate minimal dark matter models based on a confining ($SU(N)$) dark sector, motivated by the central role of non-Abelian gauge forces in the Standard Model. After arguing that dark gluons alone cannot provide viable self-interacting dark matter capable of addressing small-scale structure tensions, we consider theories with dark quarks. Although light dark quarks can generate...
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Pierros Ntelis (Harbin Institute of Technology and Institute of Theoretical Physics at NUU)7/15/26, 4:00โฏPM
deviations in the dark energy sector. We systematically compare $\Lambda$CDM with phenomenological extensions inspired by ScalarโVectorโTensor (SVT) modified gravity, collectively denoted as poly$\Lambda$CDM. These models introduce exotic components with constant equations of state, parametrised by their presentโday density parameters $\Omega_v$, $\Omega_x$, $\Omega_z$ and a fixed exponent...
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Sara Rebecca Gozzini7/15/26, 4:15โฏPM
As other Standard Model particles, neutrinos can be emitted in dark matter pair-annihilation or decay processes. However, unlike other messengers, neutrinos undergo neither deflection nor absorption over cosmic distances, making them an ideal probe for inspecting dark matter interactions in astrophysical sources, potentially yielding sizeable, high-energy fluxes. Besides, neutrinos can scan...
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Matteo Cappelli (Sapienza Universita e INFN, Roma I (IT))7/15/26, 4:30โฏPM
BULLKID-DM is a cryogenic experiment designed for the direct detection of WIMP-like dark matter particles with mass of 1 GeV or below. The detector will consist of a stack of 16 intrinsic silicon wafers, for a total mass of 800 g, carved into 2320 active dice each with a volume of 5.4ร5.4ร5 mm3. The silicon dice will be instrumented with multiplexed phonon-mediated Kinetic Inductance Detectors...
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