Cosmology wH0rksH0p

Contribution List

1. From dark SU(N) to H0 and back again

Mathias Garny (Technische Universitaet Muenchen (DE))

18/11/2024, 09:00

2. Type Ia supernova standardisation: taboo systematics in the local Hubble constant measurement

Radosław Wojtak

18/11/2024, 10:20

My talk will focus on unresolved problems in the current models of type Ia supernova standardisation and how they bias the Hubble constant determination. I will show that the supernova standardisation model employed in the SH0ES measurement leaves unaccounted for residuals in the calibration data (supernovae observed in host galaxies of Cepheids). These residuals can be traced back to the...

6. Discussion session I / Systematics or new models

18/11/2024, 11:20

Short discussion session / Systematics or new models

What is the status/systematics of the distance ladder independent measurements?

How should we interpret the new results from Wendy Freedman et al. (CCHP)?

HNEDE: Other dark radiation models (step model, decaying DM->DR, interacting DM-DR) Signatures in LSS that can discriminate? Status w.r.t. H0 tensions?

3. On the implications of the cosmic calibration tension beyond H0 and the synergy between early- and late-time new physics

Théo Simon

18/11/2024, 14:00

The cosmic calibration tension is a > 5σ discrepancy between the cosmological distance ladder built from baryonic acoustic oscillations calibrated by the Planck/ΛCDM sound horizon and Type Ia supernovae calibrated with the SH0ES absolute magnitude. In this talk, I will emphasize the consequences of this tension beyond the value of the Hubble constant, and the implications for physics beyond...

4. Decaying dark matter and emulating CMB codes

Dr Thomas Tram

18/11/2024, 15:20

In the last few years, advances in artificial neural networks has allowed fast and accurate emulation of cosmic microwave background (CMB) observables and, to a lesser degree, large-scale structure observables. The potential speed-up of this approach is significant: the execution time of a CMB code such as CLASS is of the order 10 core-seconds, while the output of the neural network is of the...

8. Beyond decay: late-time conversion of dark matter to invisible radiation

Torsten Bringmann (University of Oslo (NO))

19/11/2024, 09:00

In the cosmological concordance model, dark matter is assumed to be cold,
non-interacting and covariantly conserved. An interesting possibility to
consider is a violation of the third assumption in this simple picture,
namely the conversion of a small fraction of dark matter to an invisible
form of radiation.

So far, surprisingly little attention has been given to this option...

11. TBA

Mads Frandsen

19/11/2024, 14:00

10. Probing the intergalactic magnetic field through gamma-ray ob- servations

Manuel Meyer

19/11/2024, 15:20

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 in-direct probe of the IGMF. Gamma-rays interact with the extragalactic background light to produce...

12. The EFTofLSS: going forward

Guido D'Amico (Universita degli Studi di Parma (IT))

20/11/2024, 09:00

13. The Renormalization group of Large Scale Structure

Henrique Rubira

20/11/2024, 10:20

14. The Hubble Tension as the Signature of a New Phase of Dark Energy

Florian Niedermann (Nordita)

20/11/2024, 14:00

In my talk, will argue that the Hubble tension might be the signature of new physics in the early Universe. First, I will describe the conditions new physics has to satisfy to stand a chance of addressing the Hubble tension without compromising the fit of the CMB. Secondly, I will argue that this new physics could be related to a new phase of dark energy that decays in a first-order phase...

15. New early dark energy and its equation of state

Aleksandr Chatrchyan

20/11/2024, 15:20

Cold New Early Dark Energy (NEDE) addresses the Hubble tension using a triggered vacuum phase transition in the dark sector. In this work we constrain the phenomenological fluid model properties of NEDE using recent datasets. We allow the equation of state parameter, characterizing the post-phase transition fluid, to evolve in time. We discuss simple physical scenarios where such a...

5. Coffee

9. TBA

Torsten Bringmann (University of Oslo (NO))