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Article Dans Une Revue Classical and Quantum Gravity Année : 2010

On the thermodynamics of moving bodies

Résumé

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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Dates et versions

hal-00619937 , version 1 (07-09-2011)

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Jorge G Russo, Paul K Townsend. On the thermodynamics of moving bodies. Classical and Quantum Gravity, 2010, 27 (17), pp.175005. ⟨10.1088/0264-9381/27/17/175005⟩. ⟨hal-00619937⟩

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