Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effective Field Equations of the Quantum Gravitational Back-Reaction on
  Inflation   Quantum gravitational back-reaction offers the potential of simultaneously
resolving the problem of the cosmological constant and providing a natural
model of inflation in which scalars play no special role. In this model
inflation begins because the cosmological constant is not unnaturally small. It
ends through the accumulated gravitational interaction between virtual
gravitons which are ripped apart by the inflationary expansion. Although
perturbative techniques can be used to study the effect as long as it remains
weak, they break down when back-reaction begins to exert an appreciable effect
on the expansion rate. In this talk I argue that the end of inflation is sudden
and that there is actually an overshoot into deflation. (This incidentally
provides a very efficient mechanism for reheating.) The subsequent evolution
can be understood in terms of a competition between the opening of the past
light cone and the formation of a thermal barrier to the persistence of
correlations from during the period of inflation.

32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph