Large angle cosmic microwave background fluctuations from cosmic strings with a cosmological constant

  title={Large angle cosmic microwave background fluctuations from cosmic strings with a cosmological constant},
  author={Martin Landriau and E. P. S. Shellard},
  journal={Physical Review D},
In this paper, we present results for large-angle cosmic microwave background anisotropies generated from high resolution simulations of cosmic string networks in a range of flat Friedmann-Robertson-Walker universes with a cosmological constant. Using an ensemble of all-sky maps, we compare with the Cosmic Background Explorer data to infer a normalization (or upper bound) on the string linear energy density $\ensuremath{\mu}.$ For a flat matter-dominated model $({\ensuremath{\Omega}}_{M}=1)$ we… 
Peak–peak correlations in the cosmic background radiation from cosmic strings
We examine the two-point correlation function of local maxima in temperature fluctuations at the last scattering surface when this stochastic field is modified by the additional fluctuations produced
Observing cosmic string loops with gravitational lensing surveys
We show that the existence of cosmic strings can be strongly constrained by the next generation of gravitational lensing surveys at radio frequencies. We focus on cosmic string loops, which
Cosmic String Detection via Microlensing of Stars
Cosmic superstrings are produced towards the end of the brane inflation. If the string tension is low enough, loops tend to be relatively long-lived. The resultant string network is expected to
Bounds on cosmic strings from WMAP and SDSS
We find the constraints from Wilkinson microwave anisotropy probe (WMAP) and Sloan digital sky survey (SDSS) data on the fraction of cosmological fluctuations sourced by local cosmic strings using a
Cosmic microwave anisotropies from BPS semilocal strings
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
Cosmic strings and their induced non-Gaussianities in the cosmic microwave background
Motivated by the fact that cosmological perturbations of inflationary quantum origin were born Gaussian, the search for non-Gaussianities in the cosmic microwave background (CMB) anisotropies is
Cosmic strings as the source of small-scale microwave background anisotropy
Cosmic string networks generate cosmological perturbations actively throughout the history of the universe. Thus, the string sourced anisotropy of the cosmic microwave background is not affected by
Small-Angle CMB Temperature Anisotropies Induced by Cosmic Strings
We use Nambu-Goto numerical simulations to compute the cosmic microwave background (CMB) temperature anisotropies induced at arcminute angular scales by a network of cosmic strings in a
The Rise and Fall of the Cosmic String Theory for Cosmological Perturbations
The cosmic string theory for cosmological fluctuations is a good example of healthy scientific progress in cosmology. It is a well defined physically motivated model that has been tested by
Inflation, Strings, CMB anisotropies and Leptogenesis
In this talk, I shall focus on theories beyond the Standard Model which predict massive neutrinos. Hybrid inflation emerges naturally in these theories: the slow-rolling inflaton field is a gauge