Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Eddington-inspired Born-Infeld Gravity with Varying Cosmological
  Constant   In this paper we modify the EiBI model to realize a varying cosmological
constant which is determined by matter distribution. We find that the Newton's
constant is also variable and its change is related to the change of
cosmological constant. And then we study its cosmological behavior. We find
that the early universe will have different behaviors if we take different
forms of pending functions. And we can avoid singularity in early universe just
like the original EiBI model.

33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
18
The categories of this paper are: econ
16
The categories of this paper are: stat