Zobrazeno 1 - 10
of 77
pro vyhledávání: '"Radicella, N."'
The origin of the accelerated expansion of the universe is still unclear and new physics is needed on cosmological scales. We propose and test a novel interpretation of dark energy as originated by an elastic strain due to a cosmic defect in an other
Externí odkaz:
http://arxiv.org/abs/1211.3125
The properties of a spherically symmetric static space-time permeated of dark energy are worked out. Dark energy is viewed as the strain energy of an elastically deformable four dimensional manifold. The metric is worked out in the vacuum region arou
Externí odkaz:
http://arxiv.org/abs/1204.2965
The Cosmic Defect theory has been confronted with four observational constraints: primordial nuclear species abundances emerging from the big bang nucleosynthesis; large scale structure formation in the universe; cosmic microwave background acoustic
Externí odkaz:
http://arxiv.org/abs/1102.4435
The Horava - Lifshitz (HL) theory has recently attracted a lot of interest as a viable solution to some quantum gravity related problems and the presence of an effective cosmological constant able to drive the cosmic speed up. We show here that, in t
Externí odkaz:
http://arxiv.org/abs/1003.2144
Publikováno v:
Int.J.Mod.Phys.D18:501-512,2009
The Cosmic Defect (CD) theory is reviewed and used to fit the data for the accelerated expansion of the universe, obtained from the apparent luminosity of 192 SnIa's. The fit from CD is compared with the one obtained by means of $\Lambda $CDM. The re
Externí odkaz:
http://arxiv.org/abs/0801.1921
Autor:
Tartaglia, A., Radicella, N.
The cosmological expansion of the universe affects the behaviour of all physical systems and, in the case of gravitationally bound ones, could correspond to or mimic a time dependent Newton's constant. Here we discuss the case of a locally spherical
Externí odkaz:
http://arxiv.org/abs/0801.1888
Autor:
Jaranowski, P., Arun, K. G., Barack, L., Blanchet, L., Buonanno, A., De Laurentis, M. F., Detweiler, S., Dittus, H., Favata, M., Faye, G., Friedman, J. L., Ganz, K., Hikida, W., Iyer, B. R., Keidl, T. S., Kim, Dong-Hoon, Kokkotas, K. D., Kol, B., Kubeka, A. S., Lämmerzahl, C., Majár, J., Nagar, A., Nakano, H., Price, L. R., Qusailah, M. S. S., Radicella, N., Sago, N., Singh, D., Sotani, H., Tanaka, T., Tartaglia, A., Vasúth, M., Vega, I., Whiting, B. F., Wiseman, A. G., Yoshida, S.
Publikováno v:
Class.Quant.Grav.25:114020,2008
The paper summarizes the parallel session B3 {\em Analytic approximations, perturbation methods, and their applications} of the GR18 conference. The talks in the session reported notably recent advances in black hole perturbations and post-Newtonian
Externí odkaz:
http://arxiv.org/abs/0710.5658
Autor:
Tartaglia, A., Radicella, N.
Publikováno v:
Phys.Rev.D76:083501,2007
Recently proposed theories based on the cosmic presence of a vectorial field are compared and contrasted. In particular the so called Einstein aether theory is discussed in parallel with a recent proposal of a strained space-time theory (Cosmic Defec
Externí odkaz:
http://arxiv.org/abs/0708.0675
Autor:
PAVÓN, D.1 diego.pavon@uab.es, RADICELLA, N.2
Publikováno v:
Thirteenth Marcel Grossmann Meeting, The: on Recent Developments in Theoretical & Experimental General Relativity, Astrophysics & Relativistic Field Theories - Proceedings of the Mg13 Meeting on General Relativity (In 3 Volumes). 2015, p1558-1560. 3p.
Autor:
TARTAGLIA, A.1 angelo.tartaglia@polito.it, RADICELLA, N.1 ninfa.radicella@uab.es
Publikováno v:
Twelfth Marcel Grossmann Meeting, The: on Recent Developments in Theoretical & Experimental General Relativity, Astrophysics & Relativistic Field Theories (In 3 Volumes) - Proceedings of the Mg12 Meeting on General Relativity. 2012, p1322-1324. 3p.