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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1972
DTSTART:20110311T220000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T125343Z
LAST-MODIFIED:20110307T154358Z
LOCATION:2241 Chamberlin Hall (coffee at 3:30 pm)
SUMMARY:Using Spin-Stable Neutron Stars to Detect Nano-Hertz Gravitati
 onal Waves from Cosmological Sources\, Physics Department Colloquium\,
  Jim Cordes\, Cornell University
DESCRIPTION:Discoveries of spin-stable pulsars with millisecond period
 s combined with new algorithms for determining arrival times of pulses
  have greatly increased the likelihood of detecting long-wavelength gr
 avitational waves using an array of such objects.  I will discuss grav
 itational wave sources\, which include merging  supermassive black hol
 es and cosmic strings.   Processes within the neutron star and its mag
 netosphere along with plasma propagation effects from the interstellar
  medium limit our ability to time-tag pulses as do instrumental effect
 s.  I will discuss these issues and assess the minimum requirements fo
 r pulsar-timing arrays to be successful. This will also involve a summ
 ary of how existing radio telescopes are being used\, the most importa
 nt of which are the Arecibo Observatory and the Green Bank Telescope\,
   and a discussion of how future array telescopes\, including the Squa
 re Kilometer Array and precursor arrays\, are required.  
URL:https://www.physics.wisc.edu/events/?id=1972
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