Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Curvaton Hypothesis and the eta-problem of Quintessential Inflation,
  with and without Branes   It is argued why, contrary to expectations, steep brane-inflation cannot
really help in overcoming the eta-problem of quintessential inflation
model-building. In contrast it is shown that the problem is substantially
ameliorated under the curvaton hypothesis. This is quantified by considering
possible modular quintessential inflationary models in the context of both
standard and brane cosmology.

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The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ