Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Alfredo D. Millano"'
Autor:
Alfredo D. Millano, Genly Leon
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 1, Pp 1-22 (2024)
Abstract This research focuses on scalar field cosmologies with a generalized harmonic potential. Our attention is centred on the anisotropic LRS Bianchi I and III metrics, Bianchi V metrics, and their isotropic limits. We provide a comprehensive ove
Externí odkaz:
https://doaj.org/article/b1f1ff7f934544579b4768823908a0aa
Autor:
Bayron Micolta-Riascos, Alfredo D. Millano, Genly Leon, Byron Droguett, Esteban González, Juan Magaña
Publikováno v:
Fractal and Fractional, Vol 8, Iss 11, p 626 (2024)
Our paper introduces a new theoretical framework called the Fractional Einstein–Gauss–Bonnet scalar field cosmology, which has important physical implications. Using fractional calculus to modify the gravitational action integral, we derived a mo
Externí odkaz:
https://doaj.org/article/39ddf8af1d9448b5ac5206f7e05c1e42
Publikováno v:
Fractal and Fractional, Vol 8, Iss 5, p 253 (2024)
Fractional differential calculus is a mathematical tool that has found applications in the study of social and physical behaviors considered “anomalous”. It is often used when traditional integer derivatives models fail to represent cases where t
Externí odkaz:
https://doaj.org/article/874cc7c0b0d64701badd320aaaf4b3b1
Publikováno v:
Physics Letters B, Vol 841, Iss , Pp 137916- (2023)
We use the recently modified Friedmann equations obtained from string T-duality effects that encode the zero-point length (Jusufi and Sheykhi (2023) [132]) to study the phase space analyses of a bouncing early universe. An important implication of su
Externí odkaz:
https://doaj.org/article/241b4555885f4c839b041c8deff4aa49
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 10, Pp 1-54 (2021)
Abstract Scalar-field cosmologies with a generalized harmonic potential and matter with energy density $$\rho _m$$ ρ m , pressure $$p_m$$ p m , and barotropic equation of state (EoS) $$p_m=(\gamma -1)\rho _m, \; \gamma \in [0,2]$$ p m = ( γ - 1 )
Externí odkaz:
https://doaj.org/article/f36ade7d21d24611a0050687162da2d3
Autor:
Genly Leon, Sebastián Cuéllar, Esteban González, Samuel Lepe, Claudio Michea, Alfredo D. Millano
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 6, Pp 1-26 (2021)
Abstract Scalar field cosmologies with a generalized harmonic potential and a matter fluid with a barotropic equation of state (EoS) with barotropic index $$\gamma $$ γ for the locally rotationally symmetric (LRS) Bianchi I and flat Friedmann–Lema
Externí odkaz:
https://doaj.org/article/baf6a489550d4a5fbdfc699610c66a14
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 81, Iss 5, Pp 1-40 (2021)
Abstract Scalar field cosmologies with a generalized harmonic potential and a matter fluid with a barotropic Equation of State (EoS) with barotropic index $$\gamma $$ γ for locally rotationally symmetric (LRS) Bianchi III metric and open Friedmann
Externí odkaz:
https://doaj.org/article/5bb2bf4c9592470eb536136c9c1d2d6f
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 80, Iss 12, Pp 1-41 (2020)
Abstract The asymptotic properties of conformally static metrics in Einstein–æther theory with a perfect fluid source and a scalar field are analyzed. In case of perfect fluid, some relativistic solutions are recovered such as: Minkowski spacetime
Externí odkaz:
https://doaj.org/article/84b091b921364d868a73847b0bed6e84
Publikováno v:
Mathematics, Vol 11, Iss 6, p 1408 (2023)
We perform a detailed study of the phase-space of the field equations of an Einstein–Gauss–Bonnet scalar field cosmology for a spatially flat Friedmann–Lemaître–Robertson–Walker spacetime. For the scalar field potential, we consider the ex
Externí odkaz:
https://doaj.org/article/34ddd1d2f96c4aa48fac1d57ab5981f2
Autor:
Bayron Micolta-Riascos, Alfredo D. Millano, Genly Leon, Cristián Erices, Andronikos Paliathanasis
Publikováno v:
Fractal and Fractional, Vol 7, Iss 2, p 149 (2023)
Recently, the research community has been exploring fractional calculus to address problems related to cosmology; in this approach, the gravitational action integral is altered, leading to a modified Friedmann equation, then the resulting theory is c
Externí odkaz:
https://doaj.org/article/191f4105fccf44059715912ca7d4cccf