15,638 research outputs found
Gravitational-Wave Stochastic Background from Kinks and Cusps on Cosmic Strings
We compute the contribution of kinks on cosmic string loops to stochastic
background of gravitational waves (SBGW).We find that kinks contribute at the
same order as cusps to the SBGW.We discuss the accessibility of the total
background due to kinks as well as cusps to current and planned gravitational
wave detectors, as well as to the big bang nucleosynthesis (BBN), the cosmic
microwave background (CMB), and pulsar timing constraints. As in the case of
cusps, we find that current data from interferometric gravitational wave
detectors, such as LIGO, are sensitive to areas of parameter space of cosmic
string models complementary to those accessible to pulsar, BBN, and CMB bounds.Comment: 24 pages, 3 figure
B-mode polarization induced by gravitational waves from kinks on infinite cosmic strings
We investigate the effect of the stochastic gravitational wave (GW)
background produced by kinks on infinite cosmic strings, whose spectrum was
derived in our previous work, on the B-mode power spectrum of the cosmic
microwave background (CMB) anisotropy. We find that the B-mode polarization due
to kinks is comparable to that induced by the motion of the string network and
hence the contribution of GWs from kinks is important for estimating the B-mode
power spectrum originating from cosmic strings. If the tension of cosmic
strings \mu is large enough i.e., G\mu >~ 10^{-8}, B-mode polarization induced
by cosmic strings can be detected by future CMB experiments.Comment: 13 pages, 1 figur
Large scale EPR correlations and cosmic gravitational waves
We study how quantum correlations survive at large scales in spite of their
exposition to stochastic backgrounds of gravitational waves. We consider
Einstein-Podolski-Rosen (EPR) correlations built up on the polarizations of
photon pairs and evaluate how they are affected by the cosmic gravitational
wave background (CGWB). We evaluate the quantum decoherence of the EPR
correlations in terms of a reduction of the violation of the Bell inequality as
written by Clauser, Horne, Shimony and Holt (CHSH). We show that this
decoherence remains small and that EPR correlations can in principle survive up
to the largest cosmic scales.Comment: 5 figure
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