Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Can ghost condensate decrease entropy?   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.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin