Zobrazeno 1 - 10
of 198
pro vyhledávání: '"Gilberto M Kremer"'
Autor:
Gilberto M. Kremer, Kamel Ourabah
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 9, Pp 1-6 (2023)
Abstract 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 equation
Externí odkaz:
https://doaj.org/article/eb9f205dbe584771b323a159d6199720
Autor:
Gilberto M. Kremer
Publikováno v:
Entropy, Vol 26, Iss 3, p 246 (2024)
Self-gravitating fluid instabilities are analysed within the framework of a post-Newtonian Boltzmann equation coupled with the Poisson equations for the gravitational potentials of the post-Newtonian theory. The Poisson equations are determined from
Externí odkaz:
https://doaj.org/article/d08a2814772449778c8a9c801184d21c
Autor:
Gilberto M. Kremer
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-7 (2021)
Abstract Jeans instability within the framework of post-Newtonian Boltzmann and Poisson equations are analyzed. The components of the energy–momentum tensor are calculated from a post-Newtonian Maxwell-Jüttner distribution function. The perturbati
Externí odkaz:
https://doaj.org/article/04e7b9f17586469796f1160aa611b2cf
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 6, Pp 1-11 (2019)
Abstract We examine the evolution of non-relativistic cold dark matter gravitationally coupled to baryons with modes deep inside the Hubble radius (sub-horizon regime) using a kinetic theory approach within the realm of Newtonian theory. We obtain th
Externí odkaz:
https://doaj.org/article/18a9fbf9732b411996b8217847b2a012
Autor:
Adriano B. Barreto, Gilberto M. Kremer
Publikováno v:
Symmetry, Vol 12, Iss 7, p 1110 (2020)
The aim of this work is to study a scalar-tensor theory where owing to Palatini’s variational method the space-time is endowed with a geometrical structure of Weyl integrable type. The geometrical nature of the scalar field is related to the non-me
Externí odkaz:
https://doaj.org/article/c24b28b92d9844d7b38f50129fc85568
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 6, Pp 1-11 (2019)
European Physical Journal
European Physical Journal
We examine the evolution of non-relativistic cold dark matter gravitationally coupled to baryons with modes deep inside the Hubble radius (sub-horizon regime) using akinetic theory approach within the realm of Newtonian theory. We obtain the general
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c453a9a06b3f307f9877a4aba02f040
http://link.springer.com/article/10.1140/epjc/s10052-019-6965-3
http://link.springer.com/article/10.1140/epjc/s10052-019-6965-3
Publikováno v:
Physical Review D. 104
The objetive of this work is to investigate the influence of the corrections to the spherical symmetrical accretion of an infinity gas cloud characterized by a polytropic equation into a massive object due to the post-Newtonian approximation.The post
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e43dfe7e7a3bacb4d69cb68ae5d40269
https://doi.org/10.1103/physrevd.104.024056
https://doi.org/10.1103/physrevd.104.024056
Autor:
Gilberto M. Kremer
A kinetic theory for relativistic gases in the presence of gravitational fields is developed in the second post-Newtonian approximation. The corresponding Boltzmann equation is determined from the evolution of the one-particle distribution function w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af0b902f59a423b55d006b8e32499131
http://arxiv.org/abs/2010.11017
http://arxiv.org/abs/2010.11017
Publikováno v:
Physica A: Statistical Mechanics and its Applications. 490:92-113
A detailed kinetic-theory model for the vibrationally state-resolved transport coefficients is developed taking into account the dependence of the collision cross section on the size of vibrationally excited molecule. Algorithms for the calculation o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d433b2221cb8f924dfdeaa33f43c126a
https://doi.org/10.1016/j.physa.2017.08.019
https://doi.org/10.1016/j.physa.2017.08.019
Autor:
Valdemar Moratto, Gilberto M. Kremer
Publikováno v:
Physica A: Statistical Mechanics and its Applications. 471:44-58
In the present work, we calculate the transport coefficients for a relativistic binary mixture of diluted gases of hard-sphere particles. The gas mixture under consideration is studied within the relativistic Boltzmann equation in the presence of a g
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8559c134d7ae1e7661536d8763a87a77
https://doi.org/10.1016/j.physa.2016.12.004
https://doi.org/10.1016/j.physa.2016.12.004