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SUMMARY:Oliver Newton (CFT)\, Constraints on the properties of vMSM dark m
 atter using the satellite galaxies of the Milky Way
DTSTART;VALUE=DATE-TIME:20241023T140000Z
DTEND;VALUE=DATE-TIME:20241023T141500Z
DTSTAMP;VALUE=DATE-TIME:20261014T003836Z
UID:indico-contribution-1735@events.ncbj.gov.pl
DESCRIPTION:Low-mass galaxies provide a powerful tool with which to invest
 igate departures from the standard cosmological paradigm in models that su
 ppress the abundance of small dark matter structures. One of the simplest 
 metrics that can be used to compare different models is the abundance of s
 atellite galaxies in the Milky Way. Viable dark matter models must produce
  enough substructure to host the observed number of Galactic satellites. H
 ere\, we scrutinize the predictions of the neutrino Minimal Standard Model
  (MSM)\, a well-motivated extension of the Standard Model of particle phys
 ics in which the production of sterile neutrino dark matter is resonantly 
 enhanced by a lepton asymmetry in the primordial plasma. This process enab
 les the model to evade current constraints associated with non-resonantly 
 produced dark matter. Independently of assumptions about galaxy formation 
 physics we rule out\, with at least 95 per cent confidence\, all parameter
 izations of the MSM with sterile neutrino rest mass\, Ms1.4keV. Incorporat
 ing physically motivated prescriptions of baryonic processes and modelling
  the effects of reionization strengthen our constraints\, and we exclude a
 ll MSM parameterizations with Ms4keV. Unlike other literature\, our fiduci
 al constraints do not rule out the putative 3.55 keV X-ray line\, if it is
  indeed produced by the decay of a sterile neutrino\; however\, some of th
 e most favoured parameter space is excluded. If the Milky Way satellite co
 unt is higher than we assume\, or if the Milky Way halo is less massive th
 an M200=8 10^11 M\, we rule out the MSM as the origin of the 3.55 keV exce
 ss. In contrast with other work\, we find that the constraints from satell
 ite counts are substantially weaker than those reported from X-ray non-det
 ections.\n\nhttps://events.ncbj.gov.pl/event/364/contributions/1735/
LOCATION:
URL:https://events.ncbj.gov.pl/event/364/contributions/1735/
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