Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Lasha Berezhiani"'
Autor:
Lasha Berezhiani, Mark Trodden
Publikováno v:
Physics Letters B, Vol 840, Iss , Pp 137852- (2023)
The possibility of the resilience of the beginning of inflation under unfavourable conditions is examined by considering the initial state of the inflaton field to be in the form of a relativistic gas with some of its properties in close proximity to
Externí odkaz:
https://doaj.org/article/22df68dbef374359b3d9139f0d2202e3
Publikováno v:
Physics Letters B, Vol 819, Iss , Pp 136422- (2021)
We study the structure of galactic halos within a scalar dark matter model, endowed with a repulsive quartic self-interaction, capable of undergoing the superfluid phase transition in high-density regions. We demonstrate that the thermalized cores ar
Externí odkaz:
https://doaj.org/article/f50a8cc4f5d647deaa67796ba1f0a3ff
Autor:
Lasha Berezhiani
Publikováno v:
Physics Letters B, Vol 805, Iss , Pp - (2020)
It is shown that the standard effective field theory of non-relativistic superfluids, which includes only the leading order action in derivative expansion, is in general inadequate for studying supersonic processes. Namely, for a proper treatment of
Externí odkaz:
https://doaj.org/article/b307d55bb03c4c839efc111bdc62b26e
Autor:
Lasha Berezhiani, Justin Khoury
Publikováno v:
Physics Letters B, Vol 753, Iss C, Pp 639-643 (2016)
We propose a unified framework that reconciles the stunning success of MOND on galactic scales with the triumph of the ΛCDM model on cosmological scales. This is achieved through the physics of superfluidity. Dark matter consists of self-interacting
Externí odkaz:
https://doaj.org/article/353928f53b674f438cadbba73f9f0a9a
Autor:
Lasha Berezhiani, Mark Trodden
Publikováno v:
Physics Letters B, Vol 749, Iss C, Pp 425-430 (2015)
We propose an intuitive framework for studying the problem of initial conditions in slow-roll inflation. In particular, we consider a universe at high, but sub-Planckian energy density and analyze the circumstances under which it is plausible for it
Externí odkaz:
https://doaj.org/article/04f73fbf56224b44a3230f9ac34446bf
Autor:
Lasha Berezhiani, Mark Trodden
Publikováno v:
Physics Letters
The possibility of the resilience of the beginning of inflation under unfavorable conditions is examined by considering the initial state of the inflaton field to be in the form of a relativistic gas with some of its properties in close proximity to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b7df89b6bf96b62b975de32f1fc0495
http://arxiv.org/abs/2211.06222
http://arxiv.org/abs/2211.06222
Publikováno v:
Physical Review
The background field method is adopted for studying the dynamics of coherent states within an interacting scalar field theory. Focusing on a coherent state that corresponds to the homogeneous condensate, the quantum depletion of the expectation value
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::908798d96d5ebbdf45147126b17c6d26
https://doi.org/10.1103/physrevd.105.045003
https://doi.org/10.1103/physrevd.105.045003
Publikováno v:
Physical Review
The $S$-matrix formulation indicates that a consistent embedding of de Sitter state in quantum gravity is possible exclusively as an excited quantum state constructed on top of a valid $S$-matrix vacuum such as Minkowski. In the present paper we offe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7743cb5b455013c2bd6ff344652764c6
Autor:
Michael Zantedeschi, Lasha Berezhiani
Publikováno v:
Physical Review
Quantum dynamics of coherent states is studied within quantum field theory using two complementary methods: by organizing the evolution as a Taylor series in elapsed time and by perturbative expansion in coupling within the interaction-picture formal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f6ac780c258352b65a5ae8b532e17bdd
We compute the dynamical friction on a small perturber moving through an inviscid fluid, i.e., a superfluid. Crucially, we account for the tachyonic gravitational mass for sound waves, reminiscent of the Jeans instability of the fluid, which results
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b514e12ff4feb02ef06ed5cb76873c45