Small-scale microwave background fluctuations from cosmic strings

Abstract

view Abstract Citations (45) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Small-Scale Microwave Background Fluctuations from Cosmic Strings Hindmarsh, Mark Abstract The Cosmic Microwave Background (CMB) fluctuations at very small angular scales (less than $10'$) induced by matter sources are computed in a simplified way. The result corrects a previous formula appearing in the literature. The small scale power spectrum from cosmic strings is then calculated by a new analytic method. The result compares extremely well with the spectrum computed by numerical techniques (when the old, incorrect, formula is used). The upper bound on the string parameters derived from OVRO data is re-examined, taking into account the non-Gaussian nature of stringy perturbations on small scales. Assuming a conventional ionization history, the bound is $\gamma G\mu < 11\times 10^{-6}$, where $\gamma^2$ is the number of horizon lengths of string per horizon volume. Current simulations give $\gamma^2 = 31\pm 7$. Publication: The Astrophysical Journal Pub Date: August 1994 DOI: 10.1086/174505 arXiv: arXiv:astro-ph/9307040 Bibcode: 1994ApJ...431..534H Keywords: Background Radiation; Galactic Cosmic Rays; Galactic Evolution; Microwaves; String Theory; Cosmology; Minkowski Space; Perturbation Theory; Power Spectra; Temperature Profiles; Astrophysics; COSMOLOGY: COSMIC MICROWAVE BACKGROUND; COSMIC STRINGS; COSMOLOGY: THEORY; Astrophysics; High Energy Physics - Phenomenology E-Print: 24pp LaTeX, 5 ps figures in 4 files, self-unpacking uuencoded file. (Corrected formula for dT/T, non-Gaussian statistical analysis of OVRO data, leading to revised bound on relevant parameter of string model.) full text sources arXiv | ADS |