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SUMMARY:Bryce Cyr\, "Soft Photon Heating: A zeroth order correction to the
  global 21cm signal"
DTSTART:20260806T070400Z
DTEND:20260806T090400Z
DTSTAMP:20260821T222900Z
UID:indico-event-1386@indico.ibs.re.kr
DESCRIPTION:Abstract: In this talk I will discuss recent work highlighting
  the interplay between a cosmological low-frequency (soft) photon backgrou
 nd\, and the global 21cm brightness temperature. I will begin with a broad
  introduction to 21cm cosmology\, putting special emphasis on describing t
 he underlying physics of the signal to build intuition. Afterwards\, I wil
 l tell the tale of two intriguing astrophysical anomalies (from the EDGES 
 and ARCADE-2 experiments)\, and discuss attempts to connect them. After po
 inting out a critical flaw in our understanding circa 2018\, I will descri
 be a more accurate way to study the evolution of the global 21cm brightnes
 s temperature in the presence of soft photons. This will reveal a correcti
 on that enters at zeroth order\, qualitatively altering the shape and ampl
 itude of the expected 21cm signal in the presence of soft photons.\n\nhttp
 s://indico.ibs.re.kr/event/1386/
URL:https://indico.ibs.re.kr/event/1386/
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