Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phantom without UV pathology   We present a simple model in which the weak energy condition is violated for
spatially homogeneous, slowly evolving fields. The excitations about
Lorentz-violating background in Minkowski space do not contain ghosts, tachyons
or superluminal modes at spatial momenta ranging from some low scale epsilon to
the UV cutoff scale, while tachyons and possibly ghosts do exist at p^2 <
epsilon^2. We show that in the absence of other matter, slow roll cosmological
regime is possible; in this regime p+rho<0, and yet homogeneity and isotropy
are not completely spoiled (at the expence of fine-tuning), since for given
conformal momentum, the tachyon mode grows for short enough period of time.

34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph