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SUMMARY:ECHO21: A tool for modelling global 21-cm signal from dark ages to
  reionization - Shikhar Mittal / Battcock Centre
DTSTART:20251008T124000Z
DTEND:20251008T130500Z
UID:TALK237895@talks.cam.ac.uk
CONTACT:Xander Byrne
DESCRIPTION:I will introduce a Python package called ECHO21 for modelling 
 the global 21-cm signal from the dark ages through cosmic dawn to the end 
 of reionization. Leveraging its analytical framework\, ECHO21 generates a 
 single model in O(1) s\, allowing a large number of signals to be generate
 d efficiently by distributing models across multiple cores. Thus\, it is i
 deal for performing astrophysical or cosmological inference from a given 2
 1-cm dataset. We offer six astrophysical parameters that control the Lyman
 -α emissivity\, X-ray emissivity\, emissivity of ionizing photons\, and s
 tar formation rate. Beyond its efficiency\, some of the attractive and nov
 el features in ECHO21 relative to previously published codes are the inclu
 sion of Lyα heating\, the ability to vary the standard cosmological param
 eters as easily as the astrophysical parameters\, different models of star
  formation rate density (physically-motivated\, a semi-empirical\, and an 
 empirically-motivated)\, and modelling the global signal for a Coulomb-lik
 e interacting DM (IDM) framework. This IDM model incorporates cooling of b
 aryons as well as a delay in star formation. With several 21-cm experiment
 s soon to provide cosmic dawn 21-cm data\, ECHO21 is a flexible and extens
 ible new open-source package for making quick and sufficiently realistic a
 strophysical inferences. 
LOCATION:Hoyle Lecture theatre + Zoom 
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