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SUMMARY:Towards understanding the epoch of reionization out to the cosmic 
 dawn - Girish Kulkarni (TIFR)
DTSTART:20250516T103000Z
DTEND:20250516T113000Z
UID:TALK228586@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:Work on understanding the epoch of reionization has been galva
 nized in recent years by a series of observational and theoretical breakth
 roughs. These include the recognition that spatial structure in the Lyman-
 α forest retains signatures of reionization history\, the discovery of ga
 laxies and quasars deep in the reionization era by JWST\, and renewed effo
 rts to detect the redshifted 21-cm signal from cosmic dawn and the epoch o
 f reionization. In this talk\, I will present a series of results from our
  group that address the goal of understanding the evolving ionization stat
 e of the Universe\, from cosmic dawn to the final stages of reionization. 
 This includes new simulations of reionization\, updated measurements of th
 e mean free path of ionizing photons\, improved constraints on the neutral
  hydrogen fraction from quasar damping wings\, and interpretations of AGNs
  and LAEs discovered by JWST. I will describe our ongoing attempts to dire
 ctly detect the neutral parts of the IGM for the first time using the 21-c
 m forest\, and discuss the implications of JWST data for quasar growth dur
 ing this era. Deeper into the reionization epoch\, I will present new appr
 oaches to charting reionization using LAEs. Closer to cosmic dawn\, I will
  highlight new radiative transfer models of Lyman-α coupling and a model-
 agnostic framework for combining JWST and 21-cm observations\, including r
 esults from REACH. I will conclude by reviewing where we are and outlining
  key challenges ahead.
LOCATION:Ryle Seminar Room\, KICC + online
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