Power Spectrum of Cosmic String Perturbations on the Microwave Background
| dc.creator | Perivolaropoulos, Leandros | |
| dc.date | 1994-06-07 | |
| dc.date.accessioned | 2026-07-25T12:35:36Z | |
| dc.description | I review recent progress towards a detailed understanding of the power spectrum of cosmic string perturbations induced on the Microwave Background (CMB). The use of a simple analytic model allows to include important effects that have not been included in previous studies. These effects are potential fluctuations on the last scattering surface (the Sachs-Wolfe effect) and Doppler CMB perturbations. These previously neglected fluctuations are shown to dominate over post-recombination fluctuations (Gott-Kaiser-Stebbins effect) on angular scales less than about $2^\circ$ assuming that no reionization occurs. The effective power spectrum index $n_{eff}$ is calculated on COBE scales and is shown to be somewhat larger than 1 ($1.35 \lsim n_{eff} \lsim 1.5$). After normalizing the model on COBE data and string simulations, I derive the predicted values of $({{δT}\over T})_{rms}$ for several ongoing CMB experiments on medium and small angular scales. A comparison is also made with current observations and predictions of models based on inflation. | |
| dc.description | Invited Talk at the Global Foundation conference `Unified Symmetry of the Small and the Large', January 27-30 1994, Miami, Florida. To appear in the conference proceedings. 18 pages plus 6 figures (available in postscript from the author). Use LaTeX | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9406020 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9406020 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/10740 | |
| dc.subject | Astrophysics | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Power Spectrum of Cosmic String Perturbations on the Microwave Background | |
| dc.type | text |