Zobrazeno 1 - 10
of 312
pro vyhledávání: '"Anagnostopoulos, Fotios"'
We confront massive Proca-Nuevo gravity with cosmological observations. The former is a non-linear theory involving a massive spin-1 field, that can be extended incorporating operators of the Generalized Proca class, and when coupled to gravity it ca
Externí odkaz:
http://arxiv.org/abs/2312.15483
The $f(Q)$ theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time Universe. We use the Big Bang Nucleosynthesis (BBN) formalism
Externí odkaz:
http://arxiv.org/abs/2205.11445
Publikováno v:
Phys. Rev. D 105, 083532, 2022
A convincing explanation for the nature of the dark energy and dark matter is still missing. In recent works a RG-improved swiss-cheese cosmology with an evolving cosmological constant dependent on the \sch radius has been proven to be a promising mo
Externí odkaz:
http://arxiv.org/abs/2201.02251
Autor:
Saridakis, Emmanuel N., Yang, Weiqiang, Pan, Supriya, Anagnostopoulos, Fotios K., Basilakos, Spyros
Publikováno v:
Nucl.Phys.B 986 (2023) 116042
Soft cosmology is an extension of standard cosmology allowing for a scale-dependent equation-of-state (EoS) parameter in the dark sectors, which is one of the properties of soft materials in condensed-matter physics, that may arise either intrinsical
Externí odkaz:
http://arxiv.org/abs/2112.08330
Autor:
Vrettos, Ioannis1, Anagnostopoulos, Fotios2, Voukelatou, Panagiota1 tina.voukelatou@gmail.com, Kyvetos, Andreas1, Theotoka, Despoina3, Niakas, Dimitris4
Publikováno v:
Annals of Geriatric Medicine & Research. Mar2024, Vol. 28 Issue 1, p65-75. 11p.
We propose a novel model in the framework of $f(Q)$ gravity, which is a gravitational modification class arising from the incorporation of non-metricity. The model has General Relativity as a particular limit, it has the same number of free parameter
Externí odkaz:
http://arxiv.org/abs/2104.15123
Publikováno v:
Int.J.Mod.Phys.D 28 (2019) 14, 1944013
The novel idea is that the undergoing accelerated expansion of the universe happens due to infrared quantum gravity modifications at intermediate astrophysical scales of galaxies or galaxy clusters, within the framework of Asymptotically Safe gravity
Externí odkaz:
http://arxiv.org/abs/2102.07578
Publikováno v:
Phys. Rev. D 103, 104013 (2021)
We use data from Supernovae (SNIa) Pantheon sample, from Baryonic Acoustic Oscillations (BAO), and from cosmic chronometers measurements of the Hubble parameter (CC), alongside arguments from Big Bang Nucleosynthesis (BBN), in order to extract constr
Externí odkaz:
http://arxiv.org/abs/2012.06524
We use observational data from Supernovae (SNIa) Pantheon sample, as well as from direct measurements of the Hubble parameter from the cosmic chronometers (CC) sample, in order to extract constraints on the scenario of Barrow holographic dark energy.
Externí odkaz:
http://arxiv.org/abs/2005.10302
Publikováno v:
Int.J.Mod.Phys.D 30 (2021) 11, 2150085
The existence or not of pathologies in the context of Lagrangian theory is studied with the aid of Machine Learning algorithms. Using an example in the framework of classical mechanics, we make a proof of concept, that the construction of new physica
Externí odkaz:
http://arxiv.org/abs/2002.00049