Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Meysam Motaharfar"'
Autor:
Meysam Motaharfar, Parampreet Singh
Publikováno v:
Physical Sciences Forum, Vol 7, Iss 1, p 44 (2023)
It has recently been shown that the tunneling wavefunction proposal is consistent with loop quantum geometry corrections, including both holonomy and inverse scale factor corrections, in the gravitational part of a spatially closed isotropic model wi
Externí odkaz:
https://doaj.org/article/e8a8d0dfeb5344d195bfa4dab4f74598
Publikováno v:
Universe, Vol 9, Iss 3, p 124 (2023)
Warm inflation, its different particle physics model implementations, and the implications of dissipative particle production for its cosmology are reviewed. First, we briefly present the background dynamics of warm inflation and contrast it with the
Externí odkaz:
https://doaj.org/article/b4a1542e2fec4111888ccf0f73f7c4dc
Autor:
Meysam Motaharfar, Parampreet Singh
In Vilenkin's tunneling wavefunction proposal our expanding universe is born via a tunneling through a barrier from nothing at the zero scale factor. We explore the viability of this proposal for the spatially closed FLRW model with a positive cosmol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::073e82656af2ba3621ca639bca7c506b
Autor:
Parampreet Singh, Meysam Motaharfar
Publikováno v:
Physical Review D. 104
A problematic feature of low energy scale inflationary models, such as Starobinsky inflation, in a spatially closed universe is the occurrence of a recollapse and a big crunch singularity before inflation can even set in. In a recent work it was show
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bd42a368017c178176130bfe90e1ff9
https://doi.org/10.1103/physrevd.104.106006
https://doi.org/10.1103/physrevd.104.106006
Autor:
Meysam Motaharfar, Rudnei O. Ramos
Publikováno v:
Physical Review
We consider warm inflation with a Dirac-Born-Infeld (DBI) kinetic term in which both the nonequilibrium dissipative particle production and the sound speed parameter slow the motion of the inflaton field. We find that a low sound speed parameter remo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::57818200444b4b45624e5ddf38a38f66
Warm brane inflation with an exponential potential: A consistent realization away from the swampland
It has very recently been realized that coupling branes to higher dimensional quantum gravity theories and considering the consistency of what lives on the branes, one is able to understand whether such theories can belong either to the swampland or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea172302cfd2475c8e7004bf1d6f4422
We reconsider a recently proposed warm G-inflation scenario in which the Galileon scalar field concurrently dissipates its kinetic energy as the radiation fluid throughout inflation and the universe smoothly enters into a radiation dominated era with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7c086a6845030b3a541f4fa5d92d13d
We discuss how dissipative effects and the presence of a thermal radiation bath, which are inherent characteristics of the warm inflation dynamics, can evade the recently proposed Swampland conjectures. Different forms of dissipation terms, motivated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7d6684c84c3f793b730dcff0d160d8d
Publikováno v:
Physical Review D. 96
Recently, it has been realized that the so-called G-inflation model inspired by supplementing a generalized covariant Galileon-like non-linear derivative self-interacting term to the standard kinetic term should be ruled out from inflationary models.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c92d42e05fe7ca57fe0a40dcf58bec54
https://doi.org/10.1103/physrevd.96.103541
https://doi.org/10.1103/physrevd.96.103541
Publikováno v:
European Physical Journal C
We analyze the cosmology of a general scalar–tensor theory which encompasses generalized Brans–Dicke theory, Gauss–Bonnet gravity, non-minimal derivative gravity, generalized Galilean gravity and also the general k-essence type models. Instead
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c47c7d0facc11bac3f455a5b40b4cb95
https://doi.org/10.1140/epjc/s10052-017-4682-3
https://doi.org/10.1140/epjc/s10052-017-4682-3