Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vacuum energy, holography and a quantum portrait of the visible Universe   Describing the presently observable Universe as a self-sustained condensate
of gravitons of size $H_0^{-1}$, with large occupation number $N$, we argue
that the most probable value for the quantum vacuum energy is of the order of
the critical energy density, as observed.

2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph