Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Decelerating universes older than their Hubble times   Recent observations suggest that Hubble's constant is large, and hence that
the Universe appears to be younger than some of its constituents. The
traditional escape route, which assumes that the expansion is accelerating,
appears to be blocked by observations of Type 1a supernovae, which suggest(ed)
that the Universe is decelerating. These observations are reconciled in a model
in which the Universe has experienced an inflationary phase in the recent past,
driven by an ultra-light inflaton whose Compton wavelength is of the same order
as the Hubble radius.

14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin