Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inflaton decay and reheating in nonminimal derivative coupling   We investigate the inflaton decay and reheating period after the end of
inflation in the non-minimal derivative coupling (NDC) model with chaotic
potential. In general, this model is known to provide an enhanced slow-roll
inflation caused by gravitationally enhanced friction. We find violent
oscillations of Hubble parameter which induces oscillations of the sound speed
squared, implying the Lagrangian instability of curvature perturbation $\zeta$
under the comoving gauge $\varphi=0$. Also, it is shown that the curvature
perturbation blows up at $\dot{\phi}=0$, leading to the breakdown of the
comoving gauge at $\dot{\phi}=0$. Therefore, we use the Newtonian gauge to
perform the perturbation analysis where the Newtonian potential is employed as
a physical variable. The curvature perturbation is not considered as a physical
variable which describes a relevant perturbation during reheating.

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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys