Zobrazeno 1 - 10
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pro vyhledávání: '"Gionti, Gabriele"'
We analyze Hamiltonian equivalence between Jordan and Einstein frames considering a mini-superspace model of flat Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe in Brans-Dicke theory. Hamiltonian equations of motion are derived in the Jordan, Ei
Externí odkaz:
http://arxiv.org/abs/2112.02098
Autor:
Gionti, Gabriele, J, S.
Publikováno v:
Phys. Rev. D 103, 024022 (2021)
Jordan and Einstein frame are studied under the light of Hamiltonian formalism. Dirac's constraint theory for Hamiltonian systems is applied to Brans-Dicke theory in the Jordan Frame. In both Jordan and Einstein frame, Brans-Dicke theory has four sec
Externí odkaz:
http://arxiv.org/abs/2003.04304
We investigate the motion of uncharged particles scattered by a binary system consisting of extremely charged black holes in equilibrium as described by the Majumdar-Papapetrou solution. We focus on unbound orbits confined to the plane containing bot
Externí odkaz:
http://arxiv.org/abs/1906.01991
Autor:
Gionti, Gabriele, J, S.
Publikováno v:
J. Phys.: Conf. Ser. 1275 012048 (2019)
A canonical analysis of RG improved action of the Einstein-Hilbert functional is performed. The gravitational and cosmological constants as function of the space-time coordinates are treated as external non-geometrical fields. Dirac's constraint anal
Externí odkaz:
http://arxiv.org/abs/1902.03014
Autor:
Gionti, Gabriele1,2,3 (AUTHOR) ggionti@specola.va, Galaverni, Matteo1,4 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Mar2024, Vol. 84 Issue 3, p1-18. 18p.
We deal with the duality symmetry of the Dilaton field in cosmology and specifically with the so-called Gasperini-Veneziano duality transformation. In particular, we determine two conformal equivalent theories to the Dilaton field, and we show that u
Externí odkaz:
http://arxiv.org/abs/1711.11106
The Asymptotically Safe Gravity provides a framework for the description of gravity from the trans-Planckian regime to cosmological scales. According to this scenario, the cosmological constant and Newton's coupling are functions of the energy scale
Externí odkaz:
http://arxiv.org/abs/1710.06317
Autor:
Gionti, Gabriele, J, S.
The argument of Hodge duality symmetry is introduced starting from the electromagnetic field. Introducing bosonic string theory, O(d,d) duality symmetry can be implemented when there exist d-symmetries, which allows one to write Hodge-dual fields. A
Externí odkaz:
http://arxiv.org/abs/1608.05223
Autor:
Gionti, Gabriele, J, S.
Recent results in Local Regge Calculus are confronted with Spin Foam Formalism. Introducing Barrett-Crane Quantization in Local Regge Calculus makes it possible to associate a unique Spin $j_{h}$ with an hinge $h$, fulfilling one of the requirements
Externí odkaz:
http://arxiv.org/abs/1110.1575
Autor:
Gionti, Gabriele
Publikováno v:
Class.Quant.Grav. 22 (2005) 4217-4230
A discrete theory of gravity locally invariant under the Poincar\'e group is considered as in a companion paper. We define a first order theory, in the sense of Palatini, on the metric-dual Voronoi complex of a simplicial complex. We follow the same
Externí odkaz:
http://arxiv.org/abs/gr-qc/0501082