Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comoving suppression mechanism and cosmological constant problem   In this paper, we assume that the observer is fixed in a comoving frame of
reference with $g_{00}=\frac{\lambda}{\Lambda}$, where $\lambda$ and $\Lambda$
denote the comoving parameter and the cosmological constant, respectively. By
using the {\it comoving suppression mechanism} and {\it Mach's principle} (the
latter of which is used to determine the comoving parameter $\lambda$), we
calculate the vacuum energy density of quantum fluctuation field in the
above-mentioned comoving frame of reference. It is shown that in such a
comoving frame of reference, the cosmological constant will greatly decrease by
many orders of magnitude (if Mach's principle is applied to this calculation,
then it will be shown that $\Lambda$ is reduced by about 120 orders of
magnitude). Additionally, we briefly discuss the related topics such as the
varying observed speed of light ($\frac{{\rm d}c}{{\rm d}t}={\mathcal
O}(10^{-9}{\rm m/s}^{2})$) and the mystery of anomalous acceleration ($\sim
10^{-9}{\rm m/s}^{2}$) acquired by the Pioneer 10/11, Galileo and Ulysses
spacecrafts.

7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics