Title: Relativistic and nonrelativistic Landau levels for Dirac fermions in the cosmic string spacetime in the context of rainbow gravity

Abstract: In this paper, we study the relativistic and nonrelativistic Landau levels for Dirac fermions in the cosmic string spacetime in the context of rainbow gravity in $(3+1)$-dimensions, where we work with the curved Dirac equation with minimal coupling in cylindrical coordinates. Using the tetrads formalism of General Relativity, we obtain a second-order differential equation. Solving this differential equation, we obtain a generalized Laguerre equation as well as the relativistic Landau levels for the fermion and antifermion, where such energy levels are quantized in terms of the quantum numbers $n$, $m_j$ and $m_s$, and explicitly depends on the rainbow functions $f(\varepsilon)$ and $g(\varepsilon)$, charge parameter $\sigma$, cyclotron frequency $\omega_c$, curvature parameter $\alpha$, and on the square rest energy $m^2_0$ and square $z$-momentum $k^2_z$, respectively. Posteriorly, we study the nonrelativistic limit of the system, where we obtain the nonrelativistic Landau levels. In both cases (relativistic and nonrelativistic), we graphically analyze the behavior of Landau levels for the three rainbow gravity scenarios as a function of the magnetic field $B$ and of the curvature parameter $\alpha$. In addition, we also compared our problem with other works, where we verified that our results generalize several particular cases in the literature.