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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-9764
DTSTART:20260820T150000Z
DTEND:20260820T170000Z
DTSTAMP:20260801T041129Z
LAST-MODIFIED:20260729T210007Z
LOCATION:5380 Chamberlin
SUMMARY:Astrophysical Probes of Particle Dark Matter\, Preliminary Exa
 m\, Fabrizio Vassallo\, Physics PhD Graduate Student
DESCRIPTION:Dark matter remains one of the central open problems in pa
 rticle physics and cosmology\, motivating a broad range of astrophysic
 al searches for its signatures. Interpreting such signatures requires 
 accurate modeling of the connection between fundamental dark matter ph
 ysics and observable phenomena. In this preliminary exam\, I will pres
 ent two examples of my work in this direction. First\, I will discuss 
 models in which dark matter annihilates into new particles carrying ba
 ryon and lepton number\, leading to greatly enhanced production of cos
 mic-ray antideuterons and antihelium. Using state-of-the-art simulatio
 ns of particle production and antinucleus formation\, we show that the
 se scenarios can greatly enhance antinucleus yields relative to conven
 tional dark matter annihilation channels\, offering a possible explana
 tion for the tentative antinucleus events reported by AMS. I will then
  present a new framework for forecasting the sensitivity of pulsar tim
 ing arrays to compact dark matter substructures\, developing the first
  comprehensive treatment spanning the full range of substructure masse
 s and signal regimes\, from rare\, nearly static encounters to dynamic
  flybys and stochastic populations. Combining Monte Carlo simulations 
 with machine-learned surrogate likelihoods\, this framework enables ef
 ficient and unified sensitivity forecasts across these regimes. Togeth
 er\, these projects illustrate how detailed modeling of astrophysical 
 signatures can improve our ability to probe the nature of dark matter.
URL:https://www.physics.wisc.edu/events/?id=9764
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