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SEQUENCE:0
UID:UW-Physics-Event-3334
DTSTART:20140411T191500Z
DURATION:PT1H0M0S
DTSTAMP:20260419T193507Z
LAST-MODIFIED:20140408T150738Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Light from Dark Strings\, Theory Seminar (High Energy/Cosmolog
 y)\, Andrew Long\, Arizona State University
DESCRIPTION:I will suppose that there is new physics above the TeV sca
 le that is sequestered from the Standard Model in a hidden sector.  On
 e may want to invoke such a scenario to develop a viable model of dark
  matter\, to motivate Z’ searches at colliders\, or to ameliorate el
 ectroweak baryogenesis.  It has not been generally recognized that if 
 the hidden sector contains a spontaneously broken Abelian gauge symmet
 ry\, then our universe is permeated by a network of cosmic “dark str
 ings.”  With a mass scale of\, say\, 10 TeV these strings are far to
 o light to be exposed by the standard gravitational probes.  However\,
  with a coupling to the (comparatively light) Standard Model fields\, 
 the strings can produce SM particles in abundance\, and their decay pr
 oducts may be observed on Earth.  Over the recent years\, there has be
 en significant success in constraining empirical models of cosmic stri
 ngs via astrophysical probes\, particularly the diffuse gamma ray flux
  measured by EGRET and Fermi-LAT.  In this talk\, I will focus on a si
 mple model that allows only two points of interaction with the SM:  th
 e so-called gauge kinetic mixing and the Higgs portal\, which have bee
 n probed up to the TeV scale by a variety of terrestrial tests.  I wil
 l discuss whether bounds on the diffuse gamma ray flux that originates
  from cosmic dark strings provides a complimentary test at or above th
 e TeV scale.  
URL:https://www.physics.wisc.edu/events/?id=3334
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