Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Salehian, Borna"'
We study the constraints imposed on the electromagnetic response of general media by microcausality (commutators of local fields vanish outside the light cone) and positivity of the imaginary parts (the medium can only absorb energy from the external
Externí odkaz:
http://arxiv.org/abs/2405.09614
We describe a new mechanism that gives rise to dissipation during cosmic inflation. In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global $U(1)$ symmetry, along with the inflaton fie
Externí odkaz:
http://arxiv.org/abs/2305.07695
Autor:
Salehian, Borna, Zhang, Hong-Yi, Amin, Mustafa A., Kaiser, David I., Namjoo, Mohammad Hossein
Massive scalar fields provide excellent dark matter candidates, whose dynamics are often explored analytically and numerically using nonrelativistic Schr\"{o}dinger-Poisson (SP) equations in a cosmological context. In this paper, starting from the no
Externí odkaz:
http://arxiv.org/abs/2104.10128
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 minimum
Externí odkaz:
http://arxiv.org/abs/2011.06324
Publikováno v:
Phys. Rev. D 103, 063526 (2021)
We present a scenario of vector dark matter production from symmetry breaking at the end of inflation. In this model, the accumulated energy density associated with the quantum fluctuations of the dark photon accounts for the present energy density o
Externí odkaz:
http://arxiv.org/abs/2010.04491
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 photons
Externí odkaz:
http://arxiv.org/abs/2007.08148
Publikováno v:
JHEP 07 (2020) 059
A massive, nonrelativistic scalar field in an expanding spacetime is usually approximated by a pressureless perfect fluid, which leads to the standard conclusion that such a field can play the role of cold dark matter. In this paper, we systematicall
Externí odkaz:
http://arxiv.org/abs/2005.05388
Autor:
Salehian, Borna, Firouzjahi, Hassan
Publikováno v:
Phys. Rev. D 99, 025002 (2019)
In this work we study vacuum decay and bubble nucleation in models of $f(R)$ higher curvature gravity. Building upon the analysis of Coleman-De Luccia (CDL), we present the formalism to calculate the Euclidean action and the bounce solution for a gen
Externí odkaz:
http://arxiv.org/abs/1810.01391
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