Zobrazeno 1 - 10
of 72
pro vyhledávání: '"John Miritzis"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 8, Pp 1-5 (2023)
Abstract We discuss implications of the cosmological frame principle which states that cosmological effects of modified gravity must be stable as solutions of each of the corresponding sets of dynamical equations holding in the two conformally-relate
Externí odkaz:
https://doaj.org/article/dce51dabb86a4ee59c40a6eb2368b1be
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 5, Pp 1-6 (2023)
Abstract We propose a new formulation of f(R) gravity, dubbed scalarized f(R) gravity, in which the Legendre transform is included as a dynamical term. This leads to a theory with second-order field equations that describes general relativity with a
Externí odkaz:
https://doaj.org/article/bcfc94c25bd24c9ab0cb08560f731666
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 9, Pp 1-12 (2022)
Abstract We study the problem of evolution of bulk 5-fluids having an embedded braneworld with a flat, de Sitter, or anti-de Sitter geometry. We introduce new variables to express the Einstein equations as a dynamical system that depends on the equat
Externí odkaz:
https://doaj.org/article/aec2f484f1484409bb6a25ed64fbc06e
Autor:
Spiros Cotsakis, John Miritzis
Publikováno v:
Mathematics, Vol 11, Iss 3, p 633 (2023)
We study the effects of trans-Planckian censorship conjecture (TCC) bounds on geodesic completeness of spacetime and the associated existence for an infinite proper time. Using Gronwall’s lemma, TCC bounds can be derived directly, leading to a resu
Externí odkaz:
https://doaj.org/article/b9559fa65ed14120b4400d71c555d6d4
Publikováno v:
Astronomy. 1:17-35
We discuss qualitative features of the conformal relation between certain classes of gravity theories and general relativity, common to different themes such as $f(R)$, Brans-Dicke-type, and string theories. We focus primarily on the frame relations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd47d018b22bdf1dd1e1834b08b25e63
https://doi.org/10.3390/astronomy1010004
https://doi.org/10.3390/astronomy1010004
Publikováno v:
The European Physical Journal Plus. 135
We study the late time evolution of negatively curved Friedmann--Le\-ma\^{\i}tre--Robert\-son--Walker (FLRW) models with a perfect fluid matter source and a scalar field nonminimally coupled to matter. Since, under mild assumptions on the potential $
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9ab4c103e8c6b34b91649b19635bad1
https://doi.org/10.1140/epjp/s13360-020-00370-3
https://doi.org/10.1140/epjp/s13360-020-00370-3
Autor:
John Miritzis
Publikováno v:
Physical Review D. 95
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd54526708c1defa07710a6f25afb717
https://doi.org/10.1103/physrevd.95.128301
https://doi.org/10.1103/physrevd.95.128301
Publikováno v:
Environmental Modelling & Software. 53:112-120
An integrated methodology is proposed for the effective prediction of biodiversity exclusively from abiotic parameters. Phytoplankton biodiversity was expressed as richness, evenness and dominance indices and abiotic parameters included temperature,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5c15c54123e970564c88148e89b770f
https://doi.org/10.1016/j.envsoft.2013.12.001
https://doi.org/10.1016/j.envsoft.2013.12.001
Publikováno v:
International Journal of Modern Physics A. 34:1950092
We consider theories of gravity that include many coupled scalar fields with arbitrary couplings, in the geometric framework of wave maps. We examine the possibility of obtaining acceptable cosmological solutions without the inclusion of a potential
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::518250304ca4f72639c7ca348361da59
https://doi.org/10.1142/s0217751x19500921
https://doi.org/10.1142/s0217751x19500921
Publikováno v:
Estuarine, Coastal and Shelf Science. 115:210-217
The exploration of processes leading to coastal eutrophication is a major challenge in ecological research, particularly in light of important new policies such as the European Water Framework Directive. In the present study primary production (in te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b1eecc1021d19ff9a10eb5e682d8c4d
https://doi.org/10.1016/j.ecss.2012.09.003
https://doi.org/10.1016/j.ecss.2012.09.003