Analytical modeling of large-angle CMBR anisotropies from textures

Details Analytical modeling of large-angle CMBR anisotropies from textures Analytical modeling of large-angle CMBR anisotropies from textures

1995-04-12

arxiv.org/abs/astro-ph/9504042v2

Phys.Rev. D52 (1995) 689-701

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1103/PhysRevD.52.689

We propose an analytic method for predicting the large angle CMBR temperature fluctuations induced by model textures. The model makes use of only a small number of phenomenological parameters which ought to be measured from simple simulations. We derive semi-analytically the $C^l$-spectrum for $2\leq l\leq 30$ together with its associated non-Gaussian cosmic variance error bars. A slightly tilted spectrum with an extra suppression at low $l$ is found, and we investigate the dependence of the tilt on the parameters of the model. We also produce a prediction for the two point correlation function. We find a high level of cosmic confusion between texture scenarios and standard inflationary theories in any of these quantities. However, we discover that a distinctive non-Gaussian signal ought to be expected at low $l$, reflecting the prominent effect of the last texture in these multipoles.

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