Graviton production in the scaling of a long-cosmic-string network

Details Graviton production in the scaling of a long-cosmic-string network Graviton production in the scaling of a long-cosmic-string network

2011-12-09

arxiv.org/abs/1112.2077v1

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, 2 figures, accepted for publication in Physical Review D

Scientific paper

In a previous paper [1] we considered the possibility that (within the early-radiation epoch) there has been (also) a short period of a significant presence of cosmic strings. During this radiation-plus-strings stage the Universe matter-energy content can be modelled by a two-component fluid, consisting of radiation (dominant) and a cosmic-string fluid (subdominant). It was found that, during this stage, the cosmological gravitational waves (CGWs) - that had been produced in an earlier (inflationary) epoch - with comoving wave-numbers below a critical value (which depends on the physics of the cosmic-string network) were filtered, leading to a distorsion in the expected (scale-invariant) CGW power spectrum. In any case, the cosmological evolution gradually results in the scaling of any long-cosmic-string network and, hence, after a short time-interval, the Universe enters into the late-radiation era. However, along the transition from an early-radiation epoch to the late-radiation era through the radiation-plus-strings stage, the time-dependence of the cosmological scale factor is modified, something that leads to a discontinuous change of the corresponding scalar curvature, which, in turn, triggers the quantum-mechanical creation of gravitons. In this paper we discuss several aspects of such a process, and, in particular, the observational consequences on the expected gravitational-wave (GW) power spectrum.

Affiliated with

Also associated with

No associations

Rating

Graviton production in the scaling of a long-cosmic-string network does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Graviton production in the scaling of a long-cosmic-string network, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Graviton production in the scaling of a long-cosmic-string network will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-43816