Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum vacuum energy in General Relativity   The paper deals with the scale discrepancy between the observed vacuum energy
in cosmology and the theoretical quantum vacuum energy (cosmological constant
problem). Here, we demonstrate that Einstein's equation and an analogy to
particle physics leads to the first physical justification of the so-called
fine-tuning problem. This fine-tuning could be automatically satisfied with the
variable cosmological term $\Lambda(a)=\Lambda_0+\Lambda_1 a^{-(4-\epsilon)}$,
$0 < \epsilon \ll 1,$ where $a$ is the scale factor.
  As a side effect of our solution of the cosmological constant problem, the
dynamical part of the cosmological term generates an attractive force and
solves the missing mass problem of dark matter.

36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin