Zobrazeno 1 - 10
of 221
pro vyhledávání: '"Gorji Mohammad Ali"'
Autor:
Aoki, Katsuki, Gorji, Mohammad Ali, Hiramatsu, Takashi, Mukohyama, Shinji, Pookkillath, Masroor C., Takahashi, Kazufumi
We study the cosmic microwave background (CMB) radiation in the unified description of the effective field theory (EFT) of dark energy that accommodates both scalar-tensor and vector-tensor theories. The boundaries of different classes of theories ar
Externí odkaz:
http://arxiv.org/abs/2405.04265
Contrary to conformal transformations, disformal transformations can change the principal null directions of a spacetime geometry. Thus, depending on the frame a gravitational wave (GW) detector minimally couples to, the properties of GWs may change
Externí odkaz:
http://arxiv.org/abs/2402.01487
We present and analyze a new non-perturbative radiative solution of Horndeski gravity. This exact solution is constructed by a disformal mapping of a seed solution of the shift-symmetric Einstein-Scalar system belonging to the Robinson-Trautman geome
Externí odkaz:
http://arxiv.org/abs/2401.05099
Autor:
Aoki, Katsuki, Gorji, Mohammad Ali, Mukohyama, Shinji, Takahashi, Kazufumi, Yingcharoenrat, Vicharit
We formulate the effective field theory (EFT) of vector-tensor gravity for perturbations around an arbitrary background with a ${\it timelike}$ vector profile, which can be applied to study black hole perturbations. The vector profile spontaneously b
Externí odkaz:
http://arxiv.org/abs/2311.06767
Publikováno v:
Phys.Rev.D 110 (2024) 2, 024017
We formulate cosmological perturbation theory around the spatially curved FLRW background in the context of metric-affine gauge theory of gravity which includes torsion and nonmetricity. Performing scalar-vector-tensor decomposition of the spatial pe
Externí odkaz:
http://arxiv.org/abs/2310.16007
Autor:
Hatamipour Mohammad Sadegh, Almodares Abbas, Ahi Mohsen, Gorji Mohammad Ali, Jahanshah Qazaleh
Publikováno v:
Polish Journal of Chemical Technology, Vol 17, Iss 3, Pp 13-18 (2015)
Sweet sorghum juice and traditional ethanol substrate i.e. sugarcane molasses were used for ethanol production in this work. At the end of the fermentation process, the sweet sorghum juice yielded more ethanol with higher ethanol concentration compar
Externí odkaz:
https://doaj.org/article/3fdab54e03854fd3ab8cdf9597fcf9c8
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:
http://arxiv.org/abs/2307.13109
Autor:
Gorji, Mohammad Ali
The seed of dark matter can be generated from light spectator fields during inflation through a similar mechanism that the seed of observed large scale structures are produced from the inflaton field. The accumulated energy density of the correspondi
Externí odkaz:
http://arxiv.org/abs/2305.13381
Autor:
Gorji, Mohammad Ali, Sasaki, Misao
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:
http://arxiv.org/abs/2302.14080
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:
http://arxiv.org/abs/2204.09182