$f(T)$ gravitational baryogenesis

We investigate how baryogenesis can occur by the presence of an $f(T)$-related gravitational term. We study various cases of $f(T)$ gravity, and we discuss in detail the effect of the novel terms on the baryon-to-entropy ratio. Additionally, we study the constraints imposed by the observational values of the baryon-to-entropy ratio, and we discuss how more generalized cosmologies can contribute successfully, in a viable and consistent way, in the gravitational baryogenesis mechanism.

Figure 1

The $n$-dependence of the baryon-to-entropy ratio $n_B/s$, for the model $f(T)=B(-T{)}^n$, for ${\mathcal{T}}_D=2\times 10^{16}\mathrm{GeV}$, $M_{*}=10^{12}\mathrm{GeV}$, $\gamma =2.5$ and for $B=-{10}^{-6}$ (blue curve) and $B=-{10}^{-7}$ (red curve).