Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Model of Vanishing Cosmological Constant   We propose a model in which there exists a real scalar field $q$ satisfying a
condition $\dot{q} =MH$ and its energy density is given by
$(1/2)\dot{q}^2+V(q)$, where $H$ is the Hubble parameter ($H=\dot{a}/a$) and
$M$ is a mass scale characterizing the field. We show that the potential $V(q)$
of the field is uniquely determined by the condition. The potential depends on
the energy densities of background matters. We find that the vacuum energy of
the matters is cancelled by the potential of the field. As a result, the
minimum of the total energy density of the matters and the field vanishes and
is located at the infinite scale factor $a=\infty$. This remarkable property
results without a supersymmetry. We show that the present tiny dark energy is
caused by early inflation, while the energy is comparable to Planck scale
before the inflation. As our model is reduced to the $\Lambda$CDM model in the
limit $M\to 0$, it is a natural generalization of the $\Lambda$CDM model.

28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con