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SUMMARY:Exploring the Cosmos with Hydrogen Observation - Shikhar Mittal (C
 avendish)
DTSTART:20251205T113000Z
DTEND:20251205T123000Z
UID:TALK236803@talks.cam.ac.uk
CONTACT:Sandro Tacchella
DESCRIPTION:The dark ages and cosmic dawn remain among the least explored 
 epochs in our cosmic history. A powerful probe of these periods is the glo
 bal 21-cm signal. With a growing number of experiments—such as REACH—a
 pproaching the sensitivity required to detect this signal\, it is essentia
 l to develop robust tools for interpreting the forthcoming data. In this t
 alk\, I will introduce ECHO21\, a Python package I have developed for mode
 lling the global 21-cm signal from the dark ages through cosmic dawn and u
 p to the end of reionization. Built on an analytic framework\, ECHO21 can 
 generate a single signal in O(1) s\, enabling the efficient computation of
  large model grids using multi-core parallelisation. This makes it ideally
  suited for astrophysical and cosmological inference from upcoming dataset
 s. I will also present my recent work on modelling Lyman-α coupling. Conv
 entional treatments typically neglect the effects of multiple scatterings 
 of Ly-α photons. Our new framework incorporates both multiple scattering 
 and inhomogeneities in the medium\, leading to an RMS difference of up to 
 30% relative to standard calculations. I will conclude by outlining future
  directions and planned developments.\n
LOCATION:Ryle Seminar Room\, KICC + online
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