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pro vyhledávání: '"Bertini, Nicolas R."'
Autor:
Bertini, Nicolas R.
A fundamental element of scale-dependent gravity is the scale-setting procedure. We present a new covariant expression to set the scale that arises when examining the field equations. Considering the renormalization group equations and imposing energ
Externí odkaz:
http://arxiv.org/abs/2408.05893
We explore the possibility of a consistent cosmology based on the gauge-fixing independent running of the gravitational and cosmological constants ($G$ and $\Lambda$) in the framework of effective quantum gravity. In particular, their running in this
Externí odkaz:
http://arxiv.org/abs/2401.11559
Autor:
Bertini, Nicolas R., Velten, Hermano
Publikováno v:
Phys. Rev. D 107, 124005 (2023)
The $f(R,T)$ gravity is a model whose action contains an arbitrary function of the Ricci scalar $R$ and the trace of the energy-momentum tensor $T$. We consider the separable model $f (R, T ) = \chi(R) + \varphi(T )$ and shown that, for perfect fluid
Externí odkaz:
http://arxiv.org/abs/2303.09699
Publikováno v:
Phys. Rev. D 105, 023509 (2022)
We consider an action for gravity that, in addition to the Einstein-Hilbert term, contains a function of the Ricci scalar and the Gauss-Bonnet invariant. The specific form of the function considered is motivated by holographic cosmology. At backgroun
Externí odkaz:
http://arxiv.org/abs/2012.05154
Publikováno v:
Phys. Rev. D 102, 123505 (2020); Phys. Rev. D 105, 129901 (2022) (Erratum)
We consider an inflationary scenario in the holographic braneworld with a cosmological fluid occupying the 3+1 dimensional brane located at the holographic boundary of an asymptotic ADS$_5$ bulk. The contribution of the boundary conformal field can b
Externí odkaz:
http://arxiv.org/abs/2007.02332
Publikováno v:
Eur. Phys. J. C 80, 479 (2020)
General relativity (GR) extensions based on renormalization group (RG) flows may lead to scale-dependent couplings with nontrivial effects at large distance scales. Here we develop further the approach in which RG effects at large distance scales are
Externí odkaz:
http://arxiv.org/abs/1908.03960
Autor:
Bertini, Nicolas R.1 (AUTHOR), Hipólito-Ricaldi, Wiliam S.2 (AUTHOR), de Melo-Santos, Felipe1 (AUTHOR), Rodrigues, Davi C.3 (AUTHOR) davi.rodrigues@cosmo-ufes.org
Publikováno v:
European Physical Journal C -- Particles & Fields. May2020, Vol. 80 Issue 5, p1-16. 16p.
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Akademický článek
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Autor:
Bertini, Nicolas R.1 (AUTHOR), Hipólito-Ricaldi, Wiliam S.2 (AUTHOR), de Melo-Santos, Felipe1 (AUTHOR), Rodrigues, Davi C.3 (AUTHOR) davi.rodrigues@cosmo-ufes.org
Publikováno v:
European Physical Journal C -- Particles & Fields. Jul2020, Vol. 80 Issue 7, pN.PAG-N.PAG. 1p.