Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Orazi, Emanuele"'
Publikováno v:
Universe 10 (2024) no.7, 284
In this review, a pedagogical introduction to the concepts of slow-roll inflationary Universe and number of $e$-folds is provided. In particular, the differences between the basic notion of number of $e$-folds ($N_e$), total number of $e$-folds ($N_T
Externí odkaz:
http://arxiv.org/abs/2408.01854
Publikováno v:
European Physics Journal C (EPJC), Volume 84, article number 146, (2024)
We study a class of early universe cosmological models based on Einstein-Cartan gravity and including a higher derivative term corresponding to a power of the Holst scalar curvature. The resulting effective action is basically given by General Relati
Externí odkaz:
http://arxiv.org/abs/2309.11345
We revisit the gauge symmetry related to integrable projective transformations in metric-affine formalism, identifying the gauge field of the Weyl (conformal) symmetry as a dynamical component of the affine connection. In particular, we show how to i
Externí odkaz:
http://arxiv.org/abs/2207.12597
Autor:
Afonso, Victor I., Mora-Pérez, Gerardo, Olmo, Gonzalo J., Orazi, Emanuele, Rubiera-Garcia, Diego
We build an infinite class of exact axisymmetric solutions of a metric-affine gravity theory, namely, Eddington-inspired Born-Infeld gravity, coupled to an anisotropic fluid as a matter source. The solution-generating method employed is not unique of
Externí odkaz:
http://arxiv.org/abs/2111.12381
Autor:
Guerrero, Merce, Mora-Pérez, Gerardo, Olmo, Gonzalo J., Orazi, Emanuele, Rubiera-Garcia, Diego
We construct an axially symmetric solution of Eddington-inspired Born-Infeld gravity coupled to an electromagnetic field in 2+1 dimensions including a (negative) cosmological constant term. This is achieved by using a recently developed mapping proce
Externí odkaz:
http://arxiv.org/abs/2108.09594
By using a novel technique that establishes a correspondence between general relativity and metric-affine theories based on the Ricci tensor, we are able to set stringent constraints on the free parameter of Born-Infeld gravity from the ones recently
Externí odkaz:
http://arxiv.org/abs/2104.01647
Autor:
Di Marco, Alessandro1 (AUTHOR) alessandro.dimarco1@inaf.it, Orazi, Emanuele2 (NURSE), Pradisi, Gianfranco3 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Feb2024, Vol. 84 Issue 2, p1-16. 16p.
Autor:
Lobo, Francisco S. N., Olmo, Gonzalo J., Orazi, Emanuele, Rubiera-Garcia, Diego, Rustam, Azmat
Publikováno v:
Phys. Rev. D 102, 104012 (2020)
We study the structure and stability of traversable wormholes built as (spherically symmetric) thin shells in the context of Palatini $f(\mathcal{R})$ gravity. Using a suitable junction formalism for these theories we find that the effective number o
Externí odkaz:
http://arxiv.org/abs/2009.10997
Publikováno v:
Eur. Phys. J. C. 80 (2020) 1018
We find multicenter (Majumdar-Papapetrou type) solutions of Eddington-inspired Born-Infeld gravity coupled to electromagnetic fields governed by a Born-Infeld-like Lagrangian. We construct the general solution for an arbitrary number of centers in eq
Externí odkaz:
http://arxiv.org/abs/2006.08180
Autor:
Guerrero, Merce, Mora-Pérez, Gerardo, Olmo, Gonzalo J., Orazi, Emanuele, Rubiera-Garcia, Diego
Publikováno v:
JCAP 07 (2020) 058
We find an exact, rotating charged black hole solution within Eddington-inspired Born-Infeld gravity. To this end we employ a recently developed correspondence or {\it mapping} between modified gravity models built as scalars out of contractions of t
Externí odkaz:
http://arxiv.org/abs/2006.00761