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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-1793
DTSTART:20100302T213000Z
DTEND:20100302T230000Z
DTSTAMP:20260414T124524Z
LAST-MODIFIED:20100224T164805Z
LOCATION:3425 Sterling Hall
SUMMARY:Interstellar Constraints on the Evolution of Cosmic Lithium\, 
 Astronomy Colloquium\, Chris Howk\, Notre Dame University\, Physics De
 pt
DESCRIPTION:The cosmic abundance of lithium continues to represent a c
 onundrum\, as predictions from standard theories of Big Bang nucleosyn
 thesis are inconsistent with measurements in the atmospheres of the lo
 west-metallicity stars.  This discrepancy may be caused by astrophysic
 al effects\, such as the destruction of Li in the stars over their lif
 etimes\, although no fully satisfactory astrophysical explanation has 
 been proposed.  Alternatively\, it may also be explained by new physic
 s in the early universe\, e.g.\, by the early decay of particle dark m
 atter.  We are following an alternate approach to studying the cosmic 
 Li abundance: the use of interstellar gas-phase Li in low-metallicity 
 galaxies as a constraint on the primordial abundance and the cosmic ev
 olution of Li.  I will present measurement of gas-phase Li in the Smal
 l Magellanic Cloud\, the first such measurement beyond the Milky Way. 
  I will discuss the implications of our measurements and the prospects
  for future advances in this area.<br>
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URL:https://www.physics.wisc.edu/events/?id=1793
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