Zobrazeno 1 - 10
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pro vyhledávání: '"L. C. Garcia de Andrade"'
Autor:
L. C. Garcia de Andrade
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-4 (2022)
Abstract We have recently shown that in Einstein–Cartan–Brans–Dicke (ECBD) gravity, torsion effects are not present in today’s universe because they are suppressed in a four-dimensional system, as in the bulk of five-dimensional braneworld en
Externí odkaz:
https://doaj.org/article/afbe9007fa7c4d38a22c995441e72ea7
Autor:
L. C. Garcia de Andrade
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 4, Pp 1-7 (2022)
Abstract Paul and SenGupta (Eur Phys J C 79:591, 2019) have recently shown that the reason why torsion effects are not present in today s universe is that they are suppressed in the bulk of a 5D braneworld. In this case only curvature effects remain.
Externí odkaz:
https://doaj.org/article/3227d71205984aabbd2c07ae8c4df6db
Autor:
L. C. Garcia de Andrade
Publikováno v:
Universe, Vol 8, Iss 12, p 658 (2022)
Spacetime torsion is known to be highly suppressed at the end of inflation, which is called preheating. This result was recently shown in (EPJ C (2022)) in the frame of Einstein–Cartan–Brans–Dicke inflation. In this paper, it is shown that a to
Externí odkaz:
https://doaj.org/article/c672afde9f5c43ab8a7e51da95f0920f
Autor:
L. C. Garcia de Andrade
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 6, Pp 1-7 (2018)
Abstract Metric-torsion effects on chiral massless fermions are investigated in the realm of the adiabatic amplification of cosmological magnetic fields (CMFs) in a general relativistic framework and in the framework of Einstein–Cartan (EC) bouncin
Externí odkaz:
https://doaj.org/article/5b3340fa769240c48b4b552a1dac119b
Autor:
L. C. Garcia de Andrade
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 3, Pp 1-7 (2018)
Abstract Recently chiral anomalous currents have been investigated by Boyarsky et al. and Brandenburg et al. with respect to applications to the early universe. In this paper we show that these magnetic field anomalies, which can give rise to dynamo
Externí odkaz:
https://doaj.org/article/edd54f09fccf4421a4bb0dbf8c965a43
Autor:
L. C. Garcia de Andrade
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 6, Pp 1-6 (2017)
Abstract Earlier we have computed a Lorentz violation (LV) bound for torsion terms via galactic dynamos and found bounds similar to the one obtained by Kostelecky et al. (Phys Rev Lett 100:111102, 2008) which is of the order of $$10^{-31}$$ 10 - 31 G
Externí odkaz:
https://doaj.org/article/ee1e1c4b40514fe8bbf926c3bac52447
Autor:
L. C. Garcia de Andrade
Publikováno v:
International Journal of Geometric Methods in Modern Physics. 19
Recently, presence of gravitational and axial anomalies in Riemann–Cartan (RC) spacetime [Garcia de Andrade, Class. Quantum Gravity 38 (2021)] indicates that topological densities expressed in terms of torsion may be very useful in understanding th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a52599cc69db07bb23abdc18cd094d8
https://doi.org/10.1142/s0219887822501286
https://doi.org/10.1142/s0219887822501286
Autor:
L. C. Garcia de Andrade
Publikováno v:
Canadian Journal of Physics. 99:347-352
In this paper two types of applications of Cartan torsion to cosmology and quantum field theory are given. The first is given by massive photon axial torsion mixing through non-minimal coupling. It is shown that chiral anomalies induce upper limits o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9110f6290a108a931035f95d57d5af4d
https://doi.org/10.1139/cjp-2020-0259
https://doi.org/10.1139/cjp-2020-0259
Autor:
L. C. Garcia de Andrade
Publikováno v:
International Journal of Geometric Methods in Modern Physics. 19
In this paper, spin polarized domain walls in Einstein–Cartan (EC) gravity have been recently investigated [L. C. Garcia de Andrade, Einstein–Cartan non-supersymmetric dynamo walls, Ann. Phys. 432 (2021).], where the spin polarizes along the dire
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6fab626a20242fa493e3e478255371c
https://doi.org/10.1142/s0219887822501298
https://doi.org/10.1142/s0219887822501298
Autor:
L. C. Garcia de Andrade
Publikováno v:
International Journal of Geometric Methods in Modern Physics. 19
Recently, Barrow et al. showed that chaotic dynamical systems may be obtained from small fluctuations of torsion in cosmological plasmas. Following this idea our goal in this paper is to show analytically that torsion fluctuations in primordial plasm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::258f7ae316df80f3507713fe9365f30e
https://doi.org/10.1142/s0219887822500694
https://doi.org/10.1142/s0219887822500694