Zobrazeno 1 - 10
of 180
pro vyhledávání: '"Risi G"'
Autor:
Mezzapesa, F. P., Columbo, L. L., De Risi, G., Brambilla, M., Dabbicco, M., Spagnolo, V., Scamarcio, G.
We demonstrate a sensor scheme for nanoscale target displacement that relies on a single Quantum Cascade Laser (QCL) subject to optical feedback. The system combines the inherent sensitivity of QCLs to optical re-injection and their ultra-stability i
Externí odkaz:
http://arxiv.org/abs/1505.00027
Autor:
De Risi, G.
We propose a mechanism to have a smooth transition from a pre-Big Bang phase to a standard cosmological phase. Such transition is driven by gravitational production of heavy massive string states that backreact on the geometry to stop the growth of t
Externí odkaz:
http://arxiv.org/abs/1103.2311
Autor:
De Risi, G.
Publikováno v:
Nucl.Phys.B845:246-256,2011
We study the cosmology of a 5-dimensional brane, which represents a regularization of a 4-dimensional codimension-2 brane, embedded in a conical bulk. The brane is assumed to be tensional, and to contain a curvature term. Cosmology is obtained by let
Externí odkaz:
http://arxiv.org/abs/0912.0616
Autor:
De Risi, G.
We present a model in which a 3-brane is embedded in a warped 5-dimensional background with a dilaton and a Kalb-Ramond 2-form. We show that it is possible to find static solutions of the form of charged dS/AdS-like black hole which could have a nega
Externí odkaz:
http://arxiv.org/abs/0805.1685
Autor:
De Risi, G.
Publikováno v:
Phys.Rev.D77:044030,2008
We consider a 3-brane embedded in a warped 5-dimensional background with a dilaton and a Kalb-Ramond 2-form. We show that it is possible to find static solutions of the form of charged dS/AdS-like black hole with horizon which could have a negative m
Externí odkaz:
http://arxiv.org/abs/0711.3781
Autor:
De Risi, G.
Publikováno v:
Phys.Rev. D73 (2006) 124015
We consider a braneworld model in which an anisotropic brane is embedded in a dilatonic background. We solve the background solutions and study the behavior of the perturbations when the universe evolves from an inflationary Kasner phase to a Minkows
Externí odkaz:
http://arxiv.org/abs/gr-qc/0601132
Autor:
De Risi, G.
Publikováno v:
J.Phys.Conf.Ser. 33 (2006) 209-214
We present a simple model in which a brane with anisotropic metric is embedded in an AdS bulk. We discuss the localization of the massless mode and the amplification of both the massless and the massive modes on the branes, paying particular attentio
Externí odkaz:
http://arxiv.org/abs/gr-qc/0511147
Publikováno v:
Phys.Lett. B610 (2005) 9-17
We discuss the cosmological amplification of tensor perturbations in a simple example of brane-world scenario, in which massless gravitons are localized on a higher-dimensional Kasner-like brane embedded in a bulk AdS background. Particular attention
Externí odkaz:
http://arxiv.org/abs/hep-th/0501251
Publikováno v:
JHEP0411:053,2004
We study non planar corrections to the spectrum of operators in the ${\mathcal N}=2$ supersymmetric Yang Mills theory which are dual to string states in the maximally supersymmetric pp-wave background with a {\em compact} light-cone direction. The ex
Externí odkaz:
http://arxiv.org/abs/hep-th/0409315
Publikováno v:
JHEP 0212 (2002) 031
The appearance of space/time non-commutativity in theories of open strings with a constant non-diagonal background metric is considered. We show that, even if the space-time coordinates commute, when there is a metric with a time-space component, no
Externí odkaz:
http://arxiv.org/abs/hep-th/0211056