Zobrazeno 1 - 10
of 155
pro vyhledávání: '"P. Ungarelli"'
We propose a "thought technique" for detecting Gravitational Waves using Einstein-Podolski-Rosen photon Entangled States. GWs decohere the entangled photon pairs, introduce a relative rotation and de-synchronize Alice and Bob's reference frames thus
Externí odkaz:
http://arxiv.org/abs/0804.4345
Publikováno v:
Phys.Rev.D77:123526,2008
A model of non-local dilaton interactions, motivated by string duality symmetries, is applied to a scenario of "coupled quintessence" in which the dilaton dark energy is non-locally coupled to the dark-matter sources. It is shown that the non-local e
Externí odkaz:
http://arxiv.org/abs/0711.5022
Publikováno v:
Class.Quant.Grav. 22 (2005) S955-S964
One of the fundamental and yet untested predictions of inflationary models is the generation of a very weak cosmic background of gravitational radiation. We investigate the sensitivity required for a space-based gravitational wave laser interferomete
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504294
Autor:
Ungarelli, Carlo, Vecchio, Alberto
Publikováno v:
Class.Quant.Grav. 21 (2004) S857-S860
We consider a three dimensional family of filters based on broken power law spectra to search for gravitational wave stochastic backgrounds in the data from Earth-based laser interferometers. We show that such templates produce the necessary fitting
Externí odkaz:
http://arxiv.org/abs/gr-qc/0312061
Publikováno v:
Phys.Rev.D67:063516,2003
We present a gauge-invariant formalism to study the evolution of curvature perturbations in a Friedmann-Robertson-Walker universe filled by multiple interacting fluids. We resolve arbitrary perturbations into adiabatic and entropy components and deri
Externí odkaz:
http://arxiv.org/abs/astro-ph/0211602
Publikováno v:
Phys.Rev. D68 (2003) 043504
Imagine a scenario in which the dark energy forms via the condensation of dark matter at some low redshift. The Compton wavelength therefore changes from small to very large at the transition, unlike quintessence or metamorphosis. We study CMB, large
Externí odkaz:
http://arxiv.org/abs/astro-ph/0211303
Until now all well-studied dark energy models proposed have very large Compton wavelengths, $\lambda_c > 100 Mpc$ at all time and hence show no clustering on small scales. Evidence against this would disfavour both $\Lambda$CDM and quintessence. We s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210640
Publikováno v:
Phys.Rev.Lett. 90 (2003) 091303
We study the integrated Sachs-Wolfe (ISW) effect using a model-independent parameterization of the dark energy equation of state. Cosmic variance severely restricts the class of models distinguishable from Lambda-CDM. In particular if the present val
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210209
Publikováno v:
Phys.Rev.D67:023503,2003
We analyse the primordial density perturbation when it is generated by a `curvaton' field different from the inflaton. In some cases this perturbation may have large isocurvature components, fully correlated or anti-correlated with the adiabatic comp
Externí odkaz:
http://arxiv.org/abs/astro-ph/0208055
Publikováno v:
Phys.Rev. D67 (2003) 043512
We estimate the growth of matter perturbations in a class of recently proposed dark-energy models based on the (loop-corrected) gravi-dilaton string effective action, and characterized by a global attractor epoch in which dark-matter and dark-energy
Externí odkaz:
http://arxiv.org/abs/astro-ph/0208032