Zobrazeno 1 - 10
of 17
pro vyhledávání: '"E. I. Guendelman"'
Autor:
E. I. Guendelman
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 10, Pp 1-10 (2022)
Abstract Cosmological solutions are studied in the context of the modified measure formulation of string theory , then the string tension is a dynamical variable and the string the tension is an additional dynamical degree of freedom and its value is
Externí odkaz:
https://doaj.org/article/5d36905bd08c4ac396d31adf18bab0d3
Autor:
E. I. Guendelman, J. Portnoy
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 4, Pp 1-5 (2022)
Abstract There is great interest in the construction of brane worlds, where matter and gravity are forced to be effective only in a lower dimensional surface, the brane . How these could appear as a consequence of string theory is a crucial question
Externí odkaz:
https://doaj.org/article/d0a4055095f84f85864f902ac3bbe6b4
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 3, Pp 1-8 (2022)
Abstract An extension to the Einstein–Cartan (EC) action is discussed in terms of cosmological solutions. The torsion incorporated in the EC Lagrangian is assumed to be totally anti-symmetric, represented by a time-like axial vector $$S^\mu $$ S μ
Externí odkaz:
https://doaj.org/article/ef4cd128c0384714b83004858eefce0d
Autor:
E. I. Guendelman
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-10 (2021)
Abstract There is great interest in the construction of brane worlds, where matter and gravity are forced to be effective only in a lower dimensional surface, the brane . How these could appear as a consequence of string theory is a crucial question
Externí odkaz:
https://doaj.org/article/c0e6a058454c419dbf555d959a7db09a
Autor:
D. Benisty, E. I. Guendelman
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 6, Pp 1-9 (2020)
Abstract From the assumption that the slow-roll parameter $$\varepsilon $$ ε has a Lorentzian form as a function of the e-fold number N, a successful model of a quintessential inflation is obtained, as succinctly studied in [1]. The form corresponds
Externí odkaz:
https://doaj.org/article/70e3eea372a446288ec20438ebd0b224
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 79, Iss 9, Pp 1-9 (2019)
Abstract We propose a simple modified gravity model without any initial matter fields in terms of several alternative non-Riemannian spacetime volume elements within the metric (second order) formalism. We show how the non-Riemannian volume-elements,
Externí odkaz:
https://doaj.org/article/347174a931ca4dfaaccacfd0bed5d819
Autor:
David Benisty, E. I. Guendelman
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 77, Iss 6, Pp 1-10 (2017)
Abstract Here we generalize ideas of unified dark matter–dark energy in the context of two measure theories and of dynamical space time theories. In two measure theories one uses metric independent volume elements and this allows one to construct u
Externí odkaz:
https://doaj.org/article/f6072b632cc14c9f95b9d6c567f9a749
Publikováno v:
AIP Conference Proceedings.
There are solutions of Israel junction conditions that describe the detachment of a region of spacetime, a bubble, from what can be called the parent spacetime. In the past these solutions have been mostly considered in the context of inflationary co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::985ff7ed53471c30344b2e401906154c
https://doi.org/10.1063/1.2823801
https://doi.org/10.1063/1.2823801
Autor:
E. I. Guendelman, O. Katz
We consider the effects of adding a scale invariant $R^{2}$ term to the action of the scale invariant model (SIM) studied previously by one of us (E.I.G., Mod. Phys. Lett. A14, 1043 (1999)). The SIM belongs to the general class of theories, where an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::44f6e20271cfd4d00db634dd5e92d55a
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