Cosmic microwave anisotropies from BPS semilocal strings

Details Cosmic microwave anisotropies from BPS semilocal strings Cosmic microwave anisotropies from BPS semilocal strings

2007-11-12

arxiv.org/abs/0711.1842v2

JCAP 0807:010,2008

Astronomy and Astrophysics

Astrophysics

15 pages, 13 figures. Minor correction of numerical results, matches published version

Scientific paper

10.1088/1475-7516/2008/07/010

We present the first ever calculation of cosmic microwave background CMB anisotropy power spectra from semilocal cosmic strings, obtained via simulations of a classical field theory. Semilocal strings are a type of non-topological defect arising in some models of inflation motivated by fundamental physics, and are thought to relax the constraints on the symmetry breaking scale as compared to models with (topological) cosmic strings. We derive constraints on the model parameters, including the string tension parameter mu, from fits to cosmological data, and find that in this regard BPS semilocal strings resemble global textures more than topological strings. The observed microwave anisotropy at l = 10 is reproduced if Gmu = 5.3x10^{-6} (G is Newton's constant). However as with other defects the spectral shape does not match observations, and in models with inflationary perturbations plus semilocal strings the 95% confidence level upper bound is Gmu<2.0x10^{-6} when CMB data, Hubble Key Project and Big Bang Nucleosynthesis data are used (c.f. Gmu<0.9x10^{-6} for cosmic strings). We additionally carry out a Bayesian model comparison of several models with and without defects, showing models with defects are neither conclusively favoured nor disfavoured at present.

Affiliated with

Also associated with

No associations

Rating

Cosmic microwave anisotropies from BPS semilocal strings 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 Cosmic microwave anisotropies from BPS semilocal strings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic microwave anisotropies from BPS semilocal strings will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-129332