Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Joan Solà Peracaula"'
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 7, Pp 1-48 (2023)
Abstract Phenomenological work in the last few years has provided significant support to the idea that the vacuum energy density (VED) is a running quantity with the cosmological evolution and that this running helps to alleviate the cosmological ten
Externí odkaz:
https://doaj.org/article/0a37cdab72ff41c4ac9432d27af52396
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 12, Pp 1-14 (2022)
Abstract Recent studies of quantum field theory in FLRW spacetime suggest that the cause of the speeding up of the universe is the running vacuum (RV), see Moreno-Pulido and Solà Peracaula (Eur Phys J C 82(6):551, 2022; Eur Phys J C 80(8):692, 2020)
Externí odkaz:
https://doaj.org/article/459283d3c9994374870456fdaf84b836
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 1, p 64 (2024)
The idea of composite dark energy (DE) is quite natural since on general grounds we expect that the vacuum energy density (associated with the cosmological term Λ) may appear in combination with other effective forms of DE, denoted X . Here we deal
Externí odkaz:
https://doaj.org/article/54486321444047f8ba27c43e9a22ab3c
Autor:
Mehdi Rezaei, Joan Solà Peracaula
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 8, Pp 1-16 (2022)
Abstract We perform a comparative study of different types of dynamical dark energy models (DDEs) using the cosmographic method. Among the models being examined herein we have the Running Vacuum models (RVMs), which have demonstrated considerable abi
Externí odkaz:
https://doaj.org/article/71da5e974bb44f8aba9716078bd6d169
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 6, Pp 1-64 (2022)
Abstract The renormalization of the vacuum energy in quantum field theory (QFT) is usually plagued with theoretical conundrums related not only with the renormalization procedure itself, but also with the fact that the final result leads usually to v
Externí odkaz:
https://doaj.org/article/9b634ec19f7449969454128bbf6b52d9
Autor:
C. P. Singh, Joan Solà Peracaula
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-16 (2021)
Abstract In this paper, we study Friedmann cosmology with time-varying vacuum energy density in the context of Brans–Dicke theory. We consider an isotropic and homogeneous flat space, filled with a matter-dominated perfect fluid and a dynamical cos
Externí odkaz:
https://doaj.org/article/8548954bb7c542f39e63be9dd291f948
Publikováno v:
Universe, Vol 9, Iss 6, p 262 (2023)
A substantial body of phenomenological and theoretical work over the last few years strengthens the possibility that the vacuum energy density (VED) of the universe is dynamical, and in particular that it adopts the ‘running vacuum model’ (RVM) f
Externí odkaz:
https://doaj.org/article/f967ef59ff9f4c30b6831db9c6e585f1
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 8, Pp 1-23 (2020)
Abstract The $$\Lambda $$ Λ -term in Einstein’s equations is a fundamental building block of the ‘concordance’ $$\Lambda $$ Λ CDM model of cosmology. Even though the model is not free of fundamental problems, they have not been circumvented b
Externí odkaz:
https://doaj.org/article/df4b5fadd0b54e4e927e842d68815304
Publikováno v:
Physics Letters B, Vol 803, Iss , Pp - (2020)
In this letter, we elaborate further on a Cosmological “Running-Vacuum” type model for the Universe, suggested previously by the authors [1,2], within the context of a string-inspired effective theory in the presence of a Kalb-Ramond (KR) gravita
Externí odkaz:
https://doaj.org/article/581355d5292f4afcb6a6d603bb9bfb7f
Publikováno v:
Universe, Vol 6, Iss 11, p 218 (2020)
We elaborate further on the compatibility of the “vacuumon potential” that characterises the inflationary phase of the running vacuum model (RVM) with the swampland criteria. The work is motivated by the fact that, as demonstrated recently by the
Externí odkaz:
https://doaj.org/article/d009baffc31243ad9ade35f446fd7111