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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-4931
DTSTART:20181026T190000Z
DTEND:20181026T202500Z
DTSTAMP:20260419T084806Z
LAST-MODIFIED:20181015T210558Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Dark quark nuggets\, Theory Seminar (High Energy/Cosmology)\, 
 Sida Lu\, University of Wisconsin-Madison
DESCRIPTION:"Dark quark nuggets''\, a lump of dark quark matter\, can 
 be produced in the early universe for a wide range of confining gauge 
 theories and serve as a macroscopic dark matter candidate. The two nec
 essary conditions\, a nonzero dark baryon number asymmetry and a first
 -order phase transition\, can be easily satisfied for many asymmetric 
 dark matter models and QCD-like gauge theories with a few massless fla
 vors. For confinement scales from 10 keV to 100 TeV\, these dark quark
  nuggets with a huge dark baryon number have their masses vary from $1
 0^{23}~mathrm{g}$ to $10^{-7}~mathrm{g}$ and their radii from $10^{8}~
 mathrm{cm}$ to $10^{-15}~mathrm{cm}$. Such macroscopic dark matter can
 didates can be searched for by a broad scope of experiments and even n
 ew detection strategies. Specifically\, we have found that the gravita
 tional microlensing experiments can probe heavier dark quark nuggets o
 r smaller confinement scales around 10 keV\; collision of dark quark n
 uggets can generate detectable and transient electromagnetic radiation
  signals\; the stochastic gravitational wave signals from the first or
 der phase transition can be probed by the pulsar timing array observat
 ions and other space-based interferometry experiments\; the approximat
 ely massless dark mesons can behave as dark radiation to be tested by 
 the next-generation CMB experiments\; the free dark baryons\, as a sub
 component of dark matter\, can have direct detection signals for a suf
 ficiently strong interaction strength with the visible sector.
URL:https://www.physics.wisc.edu/events/?id=4931
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