Zobrazeno 1 - 10
of 428
pro vyhledávání: '"Faraoni, V"'
Publikováno v:
Phys. Rev. D 94, 104019 (2016)
Motivated by statements in the literature which contradict two general theorems, the static and spherically symmetric Brans solutions of scalar-tensor gravity are analyzed explicitly in both the Jordan and the Einstein conformal frames. Depending on
Externí odkaz:
http://arxiv.org/abs/1609.02783
We survey the landscape of $f(R)$ theories of gravity in their various formulations, which have been used to model the cosmic acceleration as alternatives to dark energy and dark matter. Besides, we take into account the problem of gravitational wave
Externí odkaz:
http://arxiv.org/abs/0909.4672
Publikováno v:
Phys.Rev.D79:104004,2009
Alternative theories of gravity predict the presence of massive scalar, vector, and tensor gravitational wave modes in addition to the standard massless spin~2 graviton of general relativity. The deflection and frequency shift effects on light from d
Externí odkaz:
http://arxiv.org/abs/0812.1348
Publikováno v:
Class.Quant.Grav.23:4215-4230,2006
In the context of scalar-tensor models of dark energy and inflation, the dynamics of vacuum scalar-tensor cosmology are analysed without specifying the coupling function or the scalar field potential. A conformal transformation to the Einstein frame
Externí odkaz:
http://arxiv.org/abs/gr-qc/0605050
Autor:
Cooperstock, F. I., Faraoni, V.
Publikováno v:
Int.J.Mod.Phys. D12 (2003) 1657-1662
In the standard approach to defining a Planck scale where gravity is brought into the quantum domain, the Schwarzschild gravitational radius is set equal to the Compton wavelength. However, ignored thereby are the charge and spin, the fundamental qua
Externí odkaz:
http://arxiv.org/abs/gr-qc/0305092
Autor:
Cooperstock, F. I., Faraoni, V.
Publikováno v:
Mod.Phys.Lett. A18 (2003) 1037-1042
Traditional derivations of the Planck mass ignore the role of charge and spin in general relativity. From the Kerr-Newman null surface and horizon radii, quantized charge and spin dependence are introduced in an extended Planck scale of mass. Spectra
Externí odkaz:
http://arxiv.org/abs/hep-th/0302080
Autor:
Faraoni, V., Cooperstock, F. I.
Publikováno v:
Astrophys.J. 587 (2003) 483-486
The idea that the universe has zero total energy when one includes the contribution from the gravitational field is reconsidered. A Hamiltonian is proposed as an energy for the exact equations of FRW cosmology: it is then shown that this energy is co
Externí odkaz:
http://arxiv.org/abs/astro-ph/0212574
Autor:
Bellucci, S., Faraoni, V.
Publikováno v:
Nucl.Phys. B640 (2002) 453-468
Attention has been recently called upon the fact that the weak and null energy conditions and the second law of thermodynamics are violated in wormhole solutions of Einstein's theory with classical, nonminimally coupled, scalar fields as material sou
Externí odkaz:
http://arxiv.org/abs/hep-th/0106168
Publikováno v:
Phys.Lett. A282 (2001) 357-361
The response of a gravitational wave detector to scalar waves is analysed in the framework of the debate on the choice of conformal frames for scalar-tensor theories. A correction to the geodesic equation arising in the Einstein conformal frame modif
Externí odkaz:
http://arxiv.org/abs/hep-th/0103180
Publikováno v:
Int.J.Theor.Phys. 40 (2001) 2295
We consider the dynamics of a spatially flat universe dominated by a self-interacting nonminimally coupled scalar field. The structure of the phase space and complete phase portraits for the conformal coupling case are given. It is shown that the non
Externí odkaz:
http://arxiv.org/abs/gr-qc/0012105