Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sensitivity of inflationary predictions to pre-inflationary phases   How sensitive are the predictions of inflation to pre-inflationary conditions
when the number of efolds of inflation is not too large? In an attempt to
address this question, we consider a simple model where the inflationary era is
preceded by an era dominated by a radiation fluid, which is coupled to the
inflaton only gravitationally and which extends back to the Planck era. We show
that there is a natural generalized Bunch-Davies vacuum state for perturbations
to the coupled inflaton-gravity-fluid system at early times. With this choice
of initial state the model predicts interesting deviations from the standard
power spectrum of single field slow-roll inflation at large scales. However,
the deviations are too small to be observable in near future CMB observations.

14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex