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SUMMARY:On the thermodynamics of moving bodies - Paul Townsend (DAMTP)
DTSTART:20130426T120000Z
DTEND:20130426T130000Z
UID:TALK44522@talks.cam.ac.uk
CONTACT:Dr Joan Camps
DESCRIPTION:A particle detector undergoing stationary motion has a time-in
 dependent response. Well-known examples are inertial motion (no response) 
 and constant proper acceleration (thermal response due to Unruh effect)\, 
 but there are four other types of stationary motion. One is ``acceleration
  with drift''\, which is realized by a detector moving with constant veloc
 ity in a plane parallel to the horizon of a static black brane. The local 
 temperature on the plane is uniform so\, by restricting the angular respon
 se to directions within the plane\, one has a model for inertial motion in
  a heatbath.\n\nThe standard theory of motion in a radiation heatbath is d
 ue to Pauli and Peebles & Wilkinson\, and others. It is based on a photon 
 gas model and amounts to an application of the relativistic Doppler shift.
  This is used to subtract from the CMB measurements a dipole term due to o
 ur motion relative to the CMB rest frame.\n\nUsing the ``acceleration with
  drift'' method\, one finds a frequency-dependent dipole that agrees with 
 the standard theory at high frequencies but not at low frequencies. The po
 ssible origin of this discrepancy will be discussed.
LOCATION:Pavilion B Potter Room (B1.19)
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