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SUMMARY:Contributory: JWST-informed Cosmological Inference from 21-cm Tomo
 graphy
DTSTART;VALUE=DATE-TIME:20261117T070000Z
DTEND;VALUE=DATE-TIME:20261117T071500Z
DTSTAMP;VALUE=DATE-TIME:20261027T010322Z
UID:indico-contribution-981@indico.narit.or.th
DESCRIPTION:Speakers: Madhurima Choudhury (Birla Institute of Technology a
 nd Science\, Pilani - Hyderabad campus.)\nThe redshifted 21-cm line of neu
 tral hydrogen provides a unique probe of the high-redshift Universe\, trac
 ing the evolving state of the intergalactic medium (IGM) during the Epoch 
 of Reionization (EoR). The 21-cm signal\, however\, depends on both the un
 derlying cosmological density field and the astrophysical properties of th
 e sources driving reionization\, leading to potentially strong degeneracie
 s between cosmological and astrophysical parameters. This degeneracy prese
 nts a fundamental challenge for extracting robust cosmological information
  from 21-cm observations alone. Observations of high-redshift galaxies wit
 h the James Webb Space Telescope (JWST) provide complementary information 
 on the population of sources responsible for ionizing the IGM. In this wor
 k\, we investigate a JWST-informed framework for extracting cosmological i
 nformation from 21-cm tomography. We construct simulated EoR lightcones sp
 anning a joint parameter space of cosmological and astrophysical parameter
 s and generate corresponding galaxy observables\, including UV luminosity 
 functions\, together with the 21-cm signal. We first use the JWST-like gal
 axy observables to constrain the properties of the underlying galaxy popul
 ation and use these constraints as informative priors on the astrophysical
  parameters entering the 21-cm forward model. We then employ machine-learn
 ing-based inference to recover cosmological parameters from the 21-cm fiel
 d while marginalizing over the remaining astrophysical uncertainties. By c
 omparing 21-cm-only and JWST-informed inference\, we quantify how external
  information on the high-redshift galaxy population changes the cosmologic
 al posterior and the associated astrophysics–cosmology degeneracies.\n\n
 https://indico.narit.or.th/event/234/contributions/981/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/981/
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