Fermionic condensate and the Casimir effect in cosmic string spacetime; International Journal of Modern Physics D; Vol. 26, iss. 7

Fermionic condensate and the Casimir effect in cosmic string spacetime; International Journal of Modern Physics D; Vol. 26, iss. 7

Bibliografiset tiedot
Parent link:International Journal of Modern Physics D: Scientific Journal
Vol. 26, iss. 7.— 2017.— [26 p.]
Päätekijä: Grigoryan A. Kh.
Yhteisötekijä: Национальный исследовательский Томский политехнический университет (ТПУ) Физико-технический институт (ФТИ) Кафедра прикладной физики (№ 12) (ПФ)
Muut tekijät: Mkrtchan (Mkrtchyan) A. R. Alpik Rafaelovich, Saharian A. A. Aram
Yhteenveto:Title screen
We investigate combined effects of nontrivial topology, induced by a cosmic string, and boundaries on the fermionic condensate and the vacuum expectation value (VEV) of the energy–momentum tensor for a massive fermionic field. As geometry of boundaries we consider two plates perpendicular to the string axis on which the field is constrained by the MIT bag boundary condition. By using the Abel–Plana type summation formula, the VEVs in the region between the plates are decomposed into the boundary-free and boundary-induced contributions for general case of the planar angle deficit. The boundary-induced parts in both the fermionic condensate and the energy–momentum tensor vanish on the cosmic string. Fermionic condensate is positive near the string and negative at large distances, whereas the vacuum energy density is negative everywhere. The radial stress is equal to the energy density. For a massless field, the boundary-induced contribution in the VEV of the energy–momentum tensor is different from zero in the region between the plates only and it does not depend on the coordinate along the string axis. In the region between the plates and at large distances from the string, the decay of the topological part is exponential for both massive and massless fields. This behavior is in contrast to that for the VEV of the energy–momentum tensor in the boundary-free geometry with the power law decay for a massless field. The vacuum pressure on the plates is inhomogeneous and vanishes at the location of the string. The corresponding Casimir forces are attractive.
Режим доступа: по договору с организацией-держателем ресурса
Kieli:englanti
Julkaistu: 2017
Aiheet:
электронный ресурс
труды учёных ТПУ
Casimir effect
cosmic string
fermionic field
эффект Казимира
фермионные поля
космические струны
Linkit:https://doi.org/10.1142/S021827181750064X
Aineistotyyppi: Elektroninen Kirjan osa
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=656045

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