Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-renormalizable terms and M theory during inflation   Inflation is well known to be difficult in the context of supergravity, if
the potential is dominated by the $F$ term. Non-renormalizable terms
generically give $|V''|\sim V/M^2$, where $V(\phi)$ is the inflaton potential
and $M$ is the scale above which the effective field theory under consideration
is supposed to break down. This is equivalent to $|\eta|\sim (\mpl/M)^2 > 1$
where $\mpl=(8\pi G)^{-1/2}$, but inflation requires $|\eta|<0.1 $. I here
point out that all of the above applies also if the $D$ term dominates, with
the crucial difference that the generic result is now easily avoided by
imposing a discrete symmetry. I also point out that if extra spacetime
dimensions appear well below the Planck scale, as in a recent M-theory model,
one expects $M\ll \mpl$, which makes the problem worse than if $M\sim \mpl$.

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The categories of this paper are: math
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
1
The categories of this paper are: cs