Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inflation in $f(R,T)$ Gravity   The article presents modeling of inflationary scenarios for the first time in
the $f(R,T)$ theory of gravity. We assume the $f(R,T)$ functional from to be $R
+ \eta T$, where $R$ denotes the Ricci scalar, $T$ the trace of the
energy-momentum tensor and $\eta$ the model parameter (constant). We first
investigated an inflationary scenario where the inflation is driven purely due
to geometric effects outside of GR. We found the inflation observables to be
independent of the number of e-foldings in this setup. The computed value of
the spectral index is consistent with latest Planck 2018 dataset while the
scalar to tensor ratio is a bit higher. We then proceeded to analyze the
behavior of an inflation driven by $f(R,T)$ gravity coupled with a real scalar
field. By taking the slow-roll approximation, we generated interesting
scenarios where a Klein Gordon potential leads to observationally consistent
inflation observables. Our results makes it clear-cut that in addition to the
Ricci scalar and scalar fields, the trace of energy momentum tensor also play a
major role in driving inflationary scenarios.

20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat