Can ghost condensate decrease entropy?

Details Can ghost condensate decrease entropy? Can ghost condensate decrease entropy?

2009-08-28

arxiv.org/abs/0908.4123v2

Open Astron.J.3:30-36,2010

Physics

High Energy Physics

High Energy Physics - Theory

16 pages, paper invited to the open astronomy journal hot topic "Gravitational Alternative for Dark Energy and Inflation"; (v2

Scientific paper

10.2174/1874381101003020030

By looking for possible violation of the generalized second law, we might be able to find regions in the space of theories and states that do not allow holographic dual descriptions. We revisit three proposals for violation of the generalized second law in the simplest Higgs phase of gravity called ghost condensate. Two of them, (i) analogue of Penrose process and (ii) semiclassical heat flow, are based on Lorentz breaking effects, by which particles of different species can have different limits of speed. We show that processes in both (i) and (ii) are always slower than accretion of ghost condensate and cannot decrease the total entropy before the accretion increases the entropy. The other proposal is to use (iii) negative energy carried by excitations of ghost condensate. We prove an averaged null energy condition, which we conjecture prevents the proposal (iii) from violating the generalized second law in a coarse-grained sense.

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