Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Trans-Planckian Physics and Inflationary Cosmology   Due to the quasi-exponential red-shifting which occurs during an inflationary
period in the very early Universe, wavelengths which at the present time
correspond to cosmological lengths are in general sub-Planckian during the
early stages of inflation. This talk discusses two approaches to addressing
this issue which both indicate that the standard predictions of inflationary
cosmology - made using classical general relativity and weakly coupled scalar
matter field theory - are not robust against changes in the physics on
trans-Planckian scales. One approach makes use of modified dispersion relations
for a usual free field scalar matter theory, the other uses some properties of
space-time non-commutativity - a feature expected in string theory. Thus, it is
possible that cosmological observations may be used as a window to explore
trans-Planckian physics. We also speculate on a novel way of obtaining
inflation based on modified dispersion relations for ordinary radiation.

11
The categories of this paper are: hep-lat
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an