Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Baryo-Leptogenesis induced by modified gravities in the primordial
  Universe   The long-standing problem of the asymmetry between matter and antimatter in
the Universe is, in this paper, analysed in the context of the modified
theories of gravity. In particular we study two models of $f(R)$ theories of
gravitation that, with the opportune choice of the free parameters, introduce a
little perturbation to the scale factor of the Universe in the radiation
dominated (RD) phase predicted by general relativity (GR), i.e., $a(t)\sim
t^{1/2}$. This little perturbation generates a Ricci scalar different by zero,
i.e., $R\neq 0$ that reproduces the correct magnitude for the asymmetry factor
$\eta$ computed in the frame of the theories of the gravitational baryogenesis
and gravitational leptogenesis. The opportune choice of the free parameters is
discussed in order to obtain results coherent with experimental data.
Furthermore, the form of the potential $V$, for the scalar-tensor theory
conformally equivalent to the $f(R)$ theory which reproduces the right
asymmetry factor, is here obtained.

1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con