Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to accomplish inflation and a constant dark energy density   It is commonly assumed that the Lagrangian of multi-field theories of gravity
contains the sum of kinetic terms of scalar fields. However, we propose here
the Lagrangian contains not the sum but the quotient of kinetic terms. With
this novel change, we find the inflationary universe can be acquired with two
scalars without the slow-roll approximation. On the other hand, a constant dark
energy density can also be achieved with two scalars while without the need of
Einstein cosmological constant.

14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs