05 1 v 2 1 1 A ug 1 99 5 BROWN - HET - 961 to appear in MNRAS Statistics of Peculiar Velocities from Cosmic Strings
نویسنده
چکیده
We calculate the probability distribution of a single component of peculiar velocities due to cosmic strings, smoothed over regions with a radius of several h −1 Mpc. The probability distribution is shown to be Gaussian to good accuracy, in agreement with the distribution of peculiar velocities deduced from the 1.9 Jy IRAS redshift survey. Using the normalization of parameters of the cosmic string model from CMB measurements , we show that the rms values for peculiar velocities inferred from IRAS are consistent with the cosmic string model provided that long strings have some small-scale structure.
منابع مشابه
Statistics of Peculiar Velocities from Cosmic Strings
We calculate the probability distribution of a single component of peculiar velocities due to cosmic strings, smoothed over regions with a radius of several h 1 Mpc. The probability distribution is shown to be Gaussian to good accuracy, in agreement with the distribution of peculiar velocities deduced from the 1.9 Jy IRAS redshift survey. Using the normalization of parameters of the cosmic stri...
متن کاملar X iv : h ep - p h / 93 02 25 4 v 1 1 2 Fe b 19 93 BROWN - HET - 896 February 1993 Gamma Ray Bursts From Ordinary Cosmic Strings
We give an upper estimate for the number of gamma ray bursts from ordinary (non-superconducting) cosmic strings expected to be observed at terrestrial detectors. Assuming that cusp annihilation is the mechanism responsible for the bursts we consider strings arising at a GUT phase transition and compare our estimate with the recent BATSE results. Further we give a lower limit for the effective a...
متن کاملPeculiar Velocities and Microwave Background Anisotropies from Cosmic Strings
Using an analytic model we show that the predictions of the cosmic string model for the peculiar velocities and the microwave background (MBR) anisotropy depend on similar combinations of string evolution parameters. Normalizing from the COBE detection of MBR anisotropy, and for certain reasonable values of string network evolution parameters, we find that the magnitude of predicted velocity fl...
متن کاملar X iv : a st ro - p h / 94 02 02 3 v 1 9 F eb 1 99 4 November 1993 BROWN - HET - 926 Signatures of Cosmic Strings on the Microwave Background
We review recent progress on testing the hypothesis of the existence of cosmic string perturbations in microwave background maps. Using an analytical model for the string network we show that the predicted amplitude and spectrum of MBR fluctuations are consistent with the COBE data for a reasonable value of the single free parameter of the string model (the mass per unit length of the string µ)...
متن کاملar X iv : a st ro - p h / 96 07 14 3 v 1 2 8 Ju l 1 99 6 Analytical Approximations to the Low - Order Statistics of Dark Matter Distribution
We show that in a hierarchical clustering model the low-order statistics of the density and the peculiar velocity fields can all be modelled semianalytically for a given cosmology and an initial density perturbation power spectrum P (k). We present such models for the two-point correlation function ξ(r), the amplitude Q of the three-point correlation function, the mean pairwise peculiar velocit...
متن کامل