On the thermodynamics of moving bodies

Details On the thermodynamics of moving bodies On the thermodynamics of moving bodies

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010cqgra..27q5005r&link_type=abstract

Classical and Quantum Gravity, Volume 27, Issue 17, pp. 175005 (2010).

Computer Science

Scientific paper

We consider an Unruh-DeWitt particle detector, coupled to a massless scalar field, undergoing 'acceleration with drift' in a (1 + 3)-dimensional Minkowski spacetime. We use this to model inertial motion in a (1 + 2)-dimensional Minkowski heat bath, in particular motion within a 2-plane parallel (and near) to the horizon of a black 2-brane. We compute the angular response of the detector in its own rest frame. The response to particles arriving from within the 2-plane is isotropic and Planckian for zero drift velocity. For small drift velocities, and in the ultra-violet limit in which the excitations behave like a classical gas, the response is just Doppler shifted. However, we find discrepancies with the Doppler-shifted formula in the infrared limit, and qualitatively different behaviour when the drift velocity is not small. We discuss possible explanations for this result and potential implications for observations of the cosmic microwave background radiation.

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