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pro vyhledávání: '"Kremer, A. M."'
We consider slow-roll inflation in the context of a modified Brans-Dicke dilaton gravity. From a two self-interacting potentials $V(\phi)$, we reproduce a Starobinsky-like potential and, commonly in syperstring models, an exponential tail potential $
Externí odkaz:
http://arxiv.org/abs/2409.02975
Autor:
Kremer, Gilberto M.
Publikováno v:
J. Phys. A: Math. Theor. 57 (2024) 235002
A kinetic theory for moderately dense gases of inelastic and rough spherical molecules is developed from the Enskog equation where a macroscopic state is characterized by 29 scalar fields which correspond to the moments of the distribution function:
Externí odkaz:
http://arxiv.org/abs/2408.00414
Autor:
Santos, Andrés, Kremer, Gilberto M.
Publikováno v:
J. Stat. Phys. 191, 54 (2024)
Granular gases demand models capable of capturing their distinct characteristics. The widely employed inelastic hard-sphere model (IHSM) introduces complexities that are compounded when incorporating realistic features like surface roughness and rota
Externí odkaz:
http://arxiv.org/abs/2311.15440
Autor:
Kremer, Gilberto M., Ourabah, Kamel
We study the Jeans gravitational instability for a mixture of baryonic and dark matter particles, in the post-Newtonian approximation. We adopt a kinetic model consisting of a coupled system of post-Newtonian collisionless Boltzmann equations, for ea
Externí odkaz:
http://arxiv.org/abs/2303.03331
Autor:
Kremer, Gilberto M.
The non-equilibrium contributions to the post-Newtonian hydrodynamic equations are determined from a relaxation-time model of the post-Newtonian Boltzmann equation. The Chapman-Enskog method is used to calculate the non-equilibrium distribution funct
Externí odkaz:
http://arxiv.org/abs/2301.04880
Autor:
Kremer, Gilberto M.
Publikováno v:
International Journal of Geometric Methods in Modern Physics Vol. 20 (2023) 2350039
The second post-Newtonian hydrodynamic equations are analyzed within the framework of a plane wave solution. The hydrodynamic equations for the mass and momentum density are coupled with six Poisson equations for the Newtonian and post-Newtonian grav
Externí odkaz:
http://arxiv.org/abs/2210.01850
Autor:
Pappas, Dimitrios A, Reed, George, Kane, Kevin, Curtis, Jeffrey R, Charles-Schoeman, Christina, Giles, Jon T, Kremer, Joel M
Publikováno v:
In Seminars in Arthritis and Rheumatism October 2024 68
Autor:
Kremer, Gilberto M., Santos, Andrés
Publikováno v:
J. Stat. Phys. 189, 23 (2022)
The most widely used model for granular gases is perhaps the inelastic hard-sphere model (IHSM), where the grains are assumed to be perfectly smooth spheres colliding with a constant coefficient of normal restitution. A much more tractable model is t
Externí odkaz:
http://arxiv.org/abs/2203.10119
Autor:
Kremer, Gilberto M.
Publikováno v:
Universe 2022, 8, 179
The post-Newtonian Jeans equation for stationary self-gravitating systems is derived from the post-Newtonian Boltzmann equation in spherical coordinates. The Jeans equation is coupled with the three Poisson equations from the post-Newtonian theory. T
Externí odkaz:
http://arxiv.org/abs/2203.06922
Autor:
Kremer, Gilberto M.
Publikováno v:
Annals of Physics 441 (2022) 168865
The post-Newtonian hydrodynamic equations for a non-perfect fluid are developed within the framework of a post-Newtonian Boltzmann equation. The post-Newtonian components of the energy-momentum tensor are determined by considering the relativistic Ec
Externí odkaz:
http://arxiv.org/abs/2112.02419