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PRODID:UW-Madison-Physics-Events
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SEQUENCE:3
UID:UW-Physics-Event-9356
DTSTART:20251124T190000Z
DTEND:20251124T203000Z
DTSTAMP:20260413T084040Z
LAST-MODIFIED:20251118T160242Z
LOCATION:Chamberlin 5280
SUMMARY:Challenging the standard neutrino sector from cosmology\, Theo
 ry Seminar (High Energy/Cosmology)\, Toni Bertólez-Martínez\, Univer
 sity of Wisconsin-Madison
DESCRIPTION:As a new postdoc in the department\, I will introduce my r
 esearch around cosmological neutrinos. In the first part of the talk\,
  I will focus on the physical effects that neutrino masses have in cos
 mological observables\, which allow cosmology to place the most string
 ent bounds on neutrino masses as of today. Then\, I will show how CMB 
 bounds can be relaxed not only by a different assumption on the cosmol
 ogical model\, but by non-standard properties of the neutrino sector. 
 This motivates a novel framework which allows to quantify which proper
 ties of neutrinos in cosmology we are actually measuring. In the secon
 d part of the talk\, I will introduce a model which could explain the 
 origin of neutrino masses by a coupling to ultralight dark matter (ULD
 M). I will introduce a consistent treatment of the coupled neutrino-UD
 LM oscillations and use Big Bang Nucleosynthesis to put competitive bo
 unds on neutrino-ULDM interactions. This talk is based in 2411.14524 a
 nd 2509.22867\, respectively.
URL:https://www.physics.wisc.edu/events/?id=9356
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