Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ricci-inverse gravity: a novel alternative gravity, its flaws, and how
  to cure them   We introduce a novel theory of gravity based on the inverse of the Ricci
tensor, that we call the anticurvature tensor. We derive the general equations
of motion for any Lagrangian function of the curvature and anticurvature
scalars. We then demonstrate a no-go theorem: no Lagrangian that contains terms
linear in any positive or negative power of the anticurvature scalar can drive
an evolution from deceleration to acceleration, as required by observations.
This effectively rules out many realizations of this theory, as we illustrate
in detail in a particular case. Finally, we speculate on how to circumvent the
no-go theorem.

37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs