Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Horizon crossing and inflation with large \eta   I examine the standard formalism of calculating curvature perturbations in
inflation at horizon crossing, and derive a general relation which must be
satisfied for the horizon crossing formalism to be valid. This relation is
satisfied for the usual cases of power-law and slow roll inflation. I then
consider a model for which the relation is strongly violated, and the curvature
perturbation evolves rapidly on superhorizon scales. This model has Hubble slow
roll parameter $\eta = 3$, but predicts a scale-invariant spectrum of density
perturbations. I consider the case of hybrid inflation with large $\eta$, and
show that such solutions do not solve the ``$\eta$ problem'' in supergravity.
These solutions correspond to field evolution which has not yet relaxed to the
inflationary attractor solution, and may make possible new, more natural models
on the string landscape.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph