Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Mohammad Ali Gorji"'
Autor:
Mohammad Ali Gorji, Misao Sasaki
Publikováno v:
Physics Letters B, Vol 846, Iss , Pp 138236- (2023)
Cosmological stochastic gravitational waves (GWs) induced by a spectator field are usually expected to have an amplitude very small compared with those generated by the curvature perturbation, or equivalently by a field dominating the universe. On th
Externí odkaz:
https://doaj.org/article/140e79a8465146b6bf2fe7e195f3e55d
Publikováno v:
Physics Letters B, Vol 846, Iss , Pp 138214- (2023)
Recently, pulsar timing array (PTA) collaborations announced evidence for an isotropic stochastic gravitational wave (GW) background. The origin of the PTA signal can be astrophysical or cosmological. In the latter case, the so-called secondary scala
Externí odkaz:
https://doaj.org/article/a90966080aab4e549c435b08a7b5a7c2
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 6, Pp 1-24 (2021)
Abstract We present a scenario of vector dark matter production during inflation containing a complex inflaton field which is charged under a dark gauge field and which has a symmetry breaking potential. As the inflaton field rolls towards the global
Externí odkaz:
https://doaj.org/article/d89927779020482b801d73e4f834426a
Publikováno v:
Journal of High Energy Physics, Vol 2021, Iss 5, Pp 1-46 (2021)
Abstract Axion-like fields heavier than about 10 −27 eV are expected to oscillate in the radiation dominated epoch when the Hubble parameter drops below their mass. Considering the Chern-Simons coupling with a dark gauge boson, large amount of dark
Externí odkaz:
https://doaj.org/article/a271931d3fca41d7b848b066f3d56853
Publikováno v:
Physics Letters B, Vol 810, Iss , Pp 135843- (2020)
We investigate the D→4 limit of the D-dimensional Einstein-Gauss-Bonnet gravity, where the limit is taken with α˜=(D−4)α kept fixed and α is the original Gauss-Bonnet coupling. Using the ADM decomposition in D dimensions, we clarify that the
Externí odkaz:
https://doaj.org/article/eee59bdde3e944a89cddb002d65cc257
Autor:
Mohammad Ali Gorji
Publikováno v:
Physics Letters B, Vol 760, Iss C, Pp 769-774 (2016)
In this paper, inspired by the ultraviolet deformation of the Friedmann–Lemaître–Robertson–Walker geometry in loop quantum cosmology, we formulate an infrared-modified cosmological model. We obtain the associated deformed Friedmann and Raychau
Externí odkaz:
https://doaj.org/article/9218ac8bd1b4435ab7f60dc46da3f7b2
Publikováno v:
Transport Policy. 133:27-44
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::43b1ccceef4c45031a96a12b8773a1f2
https://doi.org/10.1016/j.tranpol.2022.11.009
https://doi.org/10.1016/j.tranpol.2022.11.009
Publikováno v:
Transport Policy. 128:229-239
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1d7d83aeab6a3f1f9cd209a6104ff37
https://doi.org/10.1016/j.tranpol.2022.09.013
https://doi.org/10.1016/j.tranpol.2022.09.013
Lockdowns in urban scale are shown to be a last resort during pandemics. Despite the effectiveness of this strategy in preventing the spread of disease, the economic necessities of citizens and the social and psychological difficulties created during
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::85c4e4ae7d9c80c507d7aa162a5e8d0d
https://doi.org/10.21203/rs.3.rs-2936581/v1
https://doi.org/10.21203/rs.3.rs-2936581/v1
Publikováno v:
Physical Review D. 106
The cosmological memory effect is a permanent change in the relative separation of test particles located in a FLRW spacetime due to the passage of gravitational waves. In the case of a spatially flat FLRW spacetime filled with a perfect fluid in gen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ad0e120cbbfff7d3f05a33737771699
https://doi.org/10.1103/physrevd.106.024013
https://doi.org/10.1103/physrevd.106.024013