High Energy Astrophysics and Cosmology in the era of all-sky surveys

Session

Cosmology and large scale structure

18 Jun 2026, 17:05

73. Tracing the large-scale structure of the Universe back in time: why and how?

Prof. Adi Nusser

18/06/2026, 17:05

Upcoming and ongoing cosmological surveys, such as Euclid and DESI, are mapping the distribution of tens of millions of galaxies across cosmic time. These data sets will provide unprecedented opportunities to constrain the fundamental physical theory governing the Universe, including the nature of gravity, dark matter and dark energy. To fully exploit this potential, however, one must...

48. Gamma-ray cosmology: axion-like particles and Hubble constant measurements from the extragalactic background light

Lucas Gréaux (Ruhr Universität Bochum)

18/06/2026, 17:35

The extragalactic background light (EBL) encodes the signature of galaxy evolution and photon production history since the epoch of reionization. The optical and infrared photons that dominate the EBL can interact with 𝛾-rays above a certain energy threshold to create e+/e- pairs, leading to absorption imprints seen in the very-high energy (VHE; E > 100 GeV) spectra of extragalactic sources....

11. Quantum Droplets in Space: Electromagnetic- and Graviational-Wave Signatures of White Dwarf-Black Hole Tidal Stripping

Dr Marek Nikołajuk (University of Bialystok, Faculty of Physics)

18/06/2026, 17:50

We investigate the tidal stripping of a cold helium white dwarf (WD) by a stellar-mass black hole (BH). Owing to the degenerate nature of the WD, quantum effects are expected to play a significant role in the dynamics. To capture these effects, we employ a full quantum hydrodynamic framework to simulate the formation of the accretion disk. The WD is modelled as a Bose–Fermi droplet composed of...

79. The Non-Thermal SZ Effect: A New Window to Radio Galaxies and Cosmology

Prof. Subhabrata Majumdar

A novel secondary CMB anisotropy, the non-thermal Sunyaev-Zel’dovich (nthSZ) distortions of the CMB sourced by radio galaxies, opens up a new window to radio-galaxy physics and cosmology. We show how relativistic, non-thermal electrons in radio galaxy lobes imprint distinctive signatures on the cosmic microwave background via the non-thermal Sunyaev–Zel’dovich (nthSZ) effect, using a...