5th EuCAPT Annual Symposium (online)

Session

LambdaCDM and beyond

7 May 2025, 14:00

ONLY ONLINE (CERN)

14. DESI results

Andreu Font Ribera (IFAE, Barcelona)

07/05/2025, 14:00

15. Fundamental Physics with Galaxy Surveys

Azadeh Moradinezhad (University of Geneva)

07/05/2025, 14:30

16. Updates on the Hubble tension

Nils Schöneberg (ICC University Barcelona)

07/05/2025, 14:45

39. New early dark energy and its equation of state

Aleksandr Chatrchyan (Nordita)

07/05/2025, 15:00

Tests of LambdaCDM

The Hubble Tension is the discrepancy between the measured value of the Hubble parameter $H_0$ and its $\Lambda$CDM model prediction using CMB data. New Early Dark Energy (NEDE) addresses this tension using a triggered phase transition in the dark sector. In this work we constrain the properties of NEDE using recent datasets. We study the equation of state parameter, characterizing the...

37. Anisotropy in Pantheon+ supernovae

Mr Animesh Sah (Tata Institute of Fundamental Research)

07/05/2025, 15:01

Tests of LambdaCDM

We employ Maximum Likelihood Estimators to examine the Pantheon+ catalogue of Type Ia supernovae for large scale anisotropies in the expansion rate of the Universe. The analyses are carried out in the heliocentric frame, the CMB frame, as well as the Local Group frame. In all frames, the Hubble expansion rate in the redshift range 0.023 < z < 0.15 is found to have a statistically significant...

60. Inferring cosmological parameters from galaxy and dark sirens cross-correlation

Giona Sala (RWTH Aachen University)

07/05/2025, 15:02

Tests of LambdaCDM

The observation of galaxies and gravitational waves (GW) emitted by dark sirens provides two different and complementary measures of distance, respectively redshift and luminosity distance. Under the assumption that both dark sirens and galaxies trace the distribution of matter up to some bias parameters, it is possible to infer cosmological parameters by cross-correlating their density...

34. Is cosmological data suggesting a nonminimal coupling between matter and gravity?

Miguel Barroso Varela

07/05/2025, 15:03

Tests of LambdaCDM

We briefly present the late-time cosmological effects of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave background data until their values from direct late-time measurements, we can obtain an agreement between different experimental methods without disrupting their individual...

29. New robust constraints on Dark Photon Dark Matter from the intergalactic medium

ANDREA TROST (University of Trieste)

07/05/2025, 15:04

Tests of LambdaCDM

The ultralight dark photon is a well-motivated, hypothetical dark matter candidate. In a dilute plasma, they can resonantly convert into photons, and heat up the intergalactic medium between galaxies. In this talk, we explore the dark photon dark matter parameter space by comparing synthetic Lyman-α forest data from cosmological hydrodynamical simulations to observational data from VLT/UVES of...

55. Generalised Neutrino Isocurvature

Christopher Gerlach (Johannes Gutenberg-Universität Mainz)

07/05/2025, 15:05

Tests of LambdaCDM

While searches for neutrino isocurvature usually constrain a specific linear combination of isocurvature perturbations, this talk focusses on realistic cosmological scenarios giving rise to neutrino isocurvature - mostly in the form of dark radiation. In general both, neutrino and dark matter isocurvature perturbations are generated, whose ratio can be parameterised by a newly introduced...

68. Questions and Discussion

07/05/2025, 15:06

18. Panel Discussion. Panelists: Kazuya Koyama, Vivian Poulin, Zvonimir Vlah

07/05/2025, 15:30

17. Lightning talks + discussion