Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Sandeep Aashish"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-6 (2019)
Abstract Models of inflation with antisymmetric tensor studied in the past are plagued with ghost instability even in an unperturbed FRW background. We show that it is possible to avoid ghosts in an unperturbed FRW background by considering the most
Externí odkaz:
https://doaj.org/article/96916a57e14c444aaedc0429bfbecd36
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-8 (2018)
Abstract We investigate the possibility of inflation with models of antisymmetric tensor field having minimal and nonminimal couplings to gravity. Although the minimal model does not support inflation, the nonminimal models, through the introduction
Externí odkaz:
https://doaj.org/article/e3c717d880c24c11af3ba641127d013f
Autor:
Sandeep Aashish, Sukanta Panda
Publikováno v:
Springer Proceedings in Physics ISBN: 9789813344075
Recent and upcoming experimental data, as well as the possibility of rich phenomenology, has spiked interest in studying the quantum gravitational effects in cosmology at low (inflation-era) energy scales. While Planck scale physics is under developm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8769dbee9723b96e39fd6e0e3b25cbac
https://doi.org/10.1007/978-981-33-4408-2_47
https://doi.org/10.1007/978-981-33-4408-2_47
We study classes of inflation models driven by antisymmetric tensor field, with minimal and nonminimal couplings to gravity, that address known issues of such models considered in the past. First we show that with a different choice of the background
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69147d66c9cc1ca555814c584550c254
We build upon the past studies of inflation with rank-2 antisymmetric tensor field, including here the tensor perturbations to metric. We perform a comprehensive analysis of the background dynamics of our model in the presence of non-minimal coupling
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d6189b9dd0186f5b191525553780b51
Autor:
Sukanta Panda, Sandeep Aashish
We calculate the covariant one-loop quantum gravitational effective action for a scalar field model inspired by the recently proposed nonminimal natural inflation model. Our calculation is perturbative, in the sense that the effective action is evalu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fae329855b6d1bbc9f3de1d033e2f05
Publikováno v:
Journal of Cosmology and Astroparticle Physics. 2021:006
We develop the calculation of the divergent part of one-loop covariant effective action for scalar fields minimally and non-minimally coupled to gravity using the generalized Schwinger-DeWitt technique. We derive the field-space metric using Vilkovis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49afb7f7a0b499d289ed1aede7e50e11
https://doi.org/10.1088/1475-7516/2021/10/006
https://doi.org/10.1088/1475-7516/2021/10/006
Publikováno v:
European Physical Journal
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-6 (2019)
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-6 (2019)
Models of inflation with antisymmetric tensor studied in the past are plagued with ghost instability even in an unperturbed FRW background. We show that it is possible to avoid ghosts in an unperturbed FRW background by considering the most general k
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75c4f5c8f332d282d465687a980cb6f6
http://repo.scoap3.org/api
http://repo.scoap3.org/api
Autor:
Sukanta Panda, Sandeep Aashish
Publikováno v:
Physical Review D. 100
We study the quantization of a simple model of antisymmetric tensor field with spontaneous Lorentz violation in curved spacetime. We evaluate the 1-loop corrections at first order of metric perturbation, using a general covariant effective action app
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f1d5360f0976079a76350af3dec4455
https://doi.org/10.1103/physrevd.100.065010
https://doi.org/10.1103/physrevd.100.065010
Publikováno v:
European Physical Journal
European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-8 (2018)
European Physical Journal C: Particles and Fields, Vol 78, Iss 11, Pp 1-8 (2018)
We investigate the possibility of inflation with models of antisymmetric tensor field having minimal and nonminimal couplings to gravity. Although the minimal model does not support inflation, the nonminimal models, through the introduction of a nonm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7441e3e8ba15b3592578f3edcdcf7372
http://repo.scoap3.org/api
http://repo.scoap3.org/api