Radiation Anisotropy Induced by Cosmic Strings 12
نویسندگان
چکیده
We report on a current investigation of the anisotropy pattern induced by cosmic strings on the cosmic microwave background radiation (MBR). We have numerically evolved a network of cosmic strings from a redshift of Z = 100 to the present and calculated the anisotropies which they induce. Based on a limited number of realizations, we have compared the results of our simulations with the observations of the COBE-DMR experiment. We have obtained a preliminary estimate of the string mass-per-unit-length µ in the cosmic string scenario.
منابع مشابه
CMB temperature trispectrum of cosmic strings
We provide an analytical expression for the trispectrum of the cosmic microwave background (CMB) temperature anisotropies induced by cosmic strings. Our result is derived for the small angular scales under the assumption that the temperature anisotropy is induced by the Gott-Kaiser-Stebbins effect. The trispectrum is predicted to decay with a noninteger power-law exponent ‘ with 6< < 7, dependi...
متن کاملThe Implications of the Cobe-dmr Results for Cosmic Strings
We compare the anisotropies in the cosmic microwave background radiation measured by the COBE experiment to the predictions of cosmic strings. We use an analytic model for the ∆T/T power spectrum that is based on our previous numerical simulations to show that the COBE results imply a value for the string mass per unit length, μ under the assumption that cosmic strings are the source of the mea...
متن کاملar X iv : a st ro - p h / 96 09 03 8 v 1 5 S ep 1 99 6 Large Angular Scale CMB Anisotropy Induced by Cosmic Strings
We simulate the anisotropy in the cosmic microwave background (CMB) induced by cosmic strings. By numerically evolving a network of cosmic strings we generate full-sky CMB temperature anisotropy maps. Based on 192 maps, we compute the anisotropy power spectrum for multipole moments ℓ ≤ 20. By comparing with the observed temperature anisotropy, we set the normalization for the cosmic string mass...
متن کاملLarge Scale Cosmic Rays Anisotropy With IceCube
We report on a study of the anisotropy in the arrival direction of cosmic rays with a median energy per Cosmic Ray (CR) particle of ∼ 14 TeV using data from the IceCube detector. IceCube is a neutrino observatory at the geographical South Pole, when completed it will comprise 80 strings plus 6 additional strings for the low energy array Deep Core. The strings are deployed in the deep ice betwee...
متن کاملRethinking the Model of Moving Cosmic Strings Producing Anisotropy in the Microwave Background
We re-analyze the issue of redshifts induced by a moving cosmic string by looking at moving sources and observers on a conical spacetime in a fully relativistic approach. By replacing the concept of a moving spacetime with the more clearly defined concept of moving sources and observers in the string spacetime, we show that there is no effect: the only redshift is a Doppler shift due to the mot...
متن کامل