Zobrazeno 1 - 10
of 1 334
pro vyhledávání: '"Cianci, R."'
We compare theoretical predictions with observations for a class of cosmological models in which the dark energy component is modeled as a fermionic condensate, non-minimally coupled with the gravitational field and characterized by some specific sel
Externí odkaz:
http://arxiv.org/abs/1811.10300
Autor:
Rosa, C., Caravatta, L., Delli Pizzi, A., Di Tommaso, M., Cianci, R., Gasparini, L., Perrotti, F., Solmita, J., Sartori, S., Zecca, I.A.L., Di Nicola, M., Basilico, R., Genovesi, D.
Publikováno v:
In Cancer / Radiothérapie June 2019 23(3):216-221
Publikováno v:
Eur.Phys.J.C70:341-349,2010
We discuss the emergence of scalar gravitational waves in metric-affine f(R)-gravity. Such a component allows to discriminate between metric and metric-affine theories The intrinsic meaning of this result is that the geodesic structure of the theory
Externí odkaz:
http://arxiv.org/abs/1007.3670
Publikováno v:
Phys.Scripta 78:065010,2008
f(R)-gravity with geometric torsion (not related to any spin fluid) is considered in a cosmological context. We derive the field equations in vacuum and in presence of perfect-fluid matter and discuss the related cosmological models. Torsion vanishes
Externí odkaz:
http://arxiv.org/abs/0810.2549
Publikováno v:
Int.J.Geom.Meth.Mod.Phys.05:765-788,2008
We discuss the f(R)-theories of gravity with torsion in the framework of jet-bundles. Such an approach is particularly useful since the components of the torsion and curvature tensors can be chosen as fiber jet-coordinates on the bundles and then the
Externí odkaz:
http://arxiv.org/abs/0801.0445
Publikováno v:
Class.Quant.Grav.24:6417-6430,2007
The role of torsion in f(R) gravity is considered in the framework of metric-affine formalism. We discuss the field equations in empty space and in presence of perfect fluid matter taking into account the analogy with the Palatini formalism. As a res
Externí odkaz:
http://arxiv.org/abs/0708.3038
Publikováno v:
Int.J.Geom.Meth.Mod.Phys. 3 (2006) 1493-1500
The formulation of General Relativity presented in math-ph/0506077 and the Hamiltonian formulation of Gauge theories described in math-ph/0507001 are made to interact. The resulting scheme allows to see General Relativity as a constrained Gauge theor
Externí odkaz:
http://arxiv.org/abs/math-ph/0605059
Publikováno v:
Int.J.Geom.Meth.Mod.Phys. 2 (2005) 1115-1132
The Hamiltonian formulation of the theory of J-bundles is given both in the Hamilton--De Donder and in the Multimomentum Hamiltonian geometrical approaches. (3+3) Yang-Mills gauge theories are dealt with explicitly in order to restate them in terms o
Externí odkaz:
http://arxiv.org/abs/math-ph/0507001
Publikováno v:
Class.Quant.Grav. 22 (2005) 4063-4070
In the gauge natural bundle framework a new space is introduced and a first-order purely frame-formulation of General Relativity is obtained.
Comment: 9 Pages, Submitted to Classical and Quantum Gravity
Comment: 9 Pages, Submitted to Classical and Quantum Gravity
Externí odkaz:
http://arxiv.org/abs/math-ph/0506077