Zobrazeno 1 - 10
of 206
pro vyhledávání: '"Aram A. Saharian"'
Autor:
Aram A. Saharian
Publikováno v:
Symmetry, Vol 16, Iss 1, p 92 (2024)
This paper presents a review of investigations into the vacuum expectation value of the current density for a charged scalar field in spacetimes that hold toroidally compactified spatial dimensions. As background geometries, the locally Minkowskian (
Externí odkaz:
https://doaj.org/article/2733117f012443039454c463d7dead22
Publikováno v:
Symmetry, Vol 14, Iss 3, p 584 (2022)
In this paper, we analyzed the fermionic condensate (FC) associated with a massive fermionic field on a five-dimensional anti-de Sitter (AdS) spacetime in the presence of a cosmic string taking into account a magnetic flux running along its core. In
Externí odkaz:
https://doaj.org/article/7050320ed5084672a386bf994e507bbc
Autor:
Aram A. Saharian
Publikováno v:
Universe, Vol 6, Iss 10, p 181 (2020)
We review the results of investigations for brane-induced effects on the local properties of quantum vacuum in background of AdS spacetime. Two geometries are considered: a brane parallel to the AdS boundary and a brane intersecting the AdS boundary.
Externí odkaz:
https://doaj.org/article/33a5a68b51964d6cae0a49c4ddb98392
Autor:
Aram A. Saharian, Tigran A. Petrosyan
Publikováno v:
Symmetry, Vol 12, Iss 4, p 619 (2020)
The influence of a spherical boundary on the vacuum fluctuations of a massive scalar field is investigated in the background of a ( D + 1 ) -dimensional Milne universe, assuming that the field obeys Robin boundary conditions on the sphere. The normal
Externí odkaz:
https://doaj.org/article/fda3682e8b54458d9f52a044ebc8eb10
Publikováno v:
Astrophysics. 64:529-543
Fermionic condensate is investigated in $(D+1)$-dimensional de Sitter spacetime by using the cutoff function regularization. In order to fix the renormalization ambiguity for massive fields an additional condition is imposed, requiring the condensate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dadc53a0529c757d81c46843b3cb5503
https://doi.org/10.1007/s10511-021-09713-z
https://doi.org/10.1007/s10511-021-09713-z
Publikováno v:
Astrophysics. 64:355-369
Cosmological evolution is examined in a model with a conformally-coupled scalar field and with a cosmological constant. Models of this type arise in two types of gravitational theory: in the general theory of relativity and in scalar-tensor theories
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b63ca7a32b28575d757d70121a6233bc
https://doi.org/10.1007/s10511-021-09695-y
https://doi.org/10.1007/s10511-021-09695-y
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 3, Pp 1-22 (2020)
European Physical Journal
European Physical Journal C
European Physical Journal
European Physical Journal C
We investigate the combined effects of boundaries and topology on the vacuum expectation values (VEVs) of the charge and current densities for a massive 2D fermionic field confined on a conical ring threaded by a magnetic flux. Different types of bou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::833ef8181e2ea4fe2e3ee89e82014bdf
http://link.springer.com/article/10.1140/epjc/s10052-020-7819-8
http://link.springer.com/article/10.1140/epjc/s10052-020-7819-8
Autor:
Aram A. Saharian, L.Sh. Grigoryan, Artak Mkrtchyan, Sultan Dabagov, Vahan Kocharyan, Vardazar Kotanjyan, Hayk Harutyunyan, Hrant Khachatryan
Publikováno v:
SSRN Electronic Journal.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::654083b0401ec7d1d32fa88de257b7d8
https://doi.org/10.2139/ssrn.4217660
https://doi.org/10.2139/ssrn.4217660
Publikováno v:
Galaxies, Vol 5, Iss 4, p 102 (2017)
We investigate the vacuum expectation value (VEV) of the energy-momentum tensor for the electromagnetic field in anti-de Sitter (AdS) spacetime in the presence of a boundary parallel to the AdS horizon. On the boundary, the field obeys the generalize
Externí odkaz:
https://doaj.org/article/fd62dee8e660497c9e43cd8cd08382d2
Autor:
T. A. Petrosyan, Aram A. Saharian
Publikováno v:
Physical Review
Complete set of modes and the Hadamard function are constructed for a scalar field inside and outside a sphere in (D+1)-dimensional de Sitter spacetime foliated by negative constant curvature spaces. We assume that the field obeys Robin boundary cond
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee42e9bf4651d02b4e906381dc72df02
http://arxiv.org/abs/2107.04376
http://arxiv.org/abs/2107.04376
