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23 August 2021 to 7 October 2021
Venue: OAC conference center, Kolymbari, Crete, Greece. Participation is possible also via internet.
Europe/Athens timezone

Constraints on dark matter from high-redshift observations

26 Aug 2021, 17:30
30m
Room 4

Room 4

Speaker

Anton Rudakovskyi

Description

The number density of small dark matter (DM) halos hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties is complicated by degeneracies with the uncertain baryonic physics governing star formation.
We use a flexible astrophysical model and a Bayesian inference framework to analyse ultra-violet (UV) luminosity functions (LFs) at z=68. We vary the complexity of the astrophysical galaxy model as well as the matter power spectrum (cold DM vs thermal relic warm DM), comparing their Bayesian evidences.
Adopting a conservatively wide prior range for the WDM particle mass, we show that the UV LFs at z=68 only weakly favour CDM over WDM. We find that particle masses ≲2 keV are rejected at a 95% credible level in all models that have a WDM-like power spectrum cutoff. This bound should increase to 2.5 keV with the James Webb Space Telescope (JWST).

Details

Dr. Anton Rudakovskyi, Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine, Ukraine, http://bitp.kiev.ua/news

Is this abstract from experiment? No
Name of experiment and experimental site N/A
Is the speaker for that presentation defined? Yes
Internet talk Yes

Authors

Dr Nicolas Gillet Prof. Andrei Mesinger Anton Rudakovskyi Dr Denys Savchenko

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