Primordial Adiabatic Fluctuations from Cosmic Defects

Details Primordial Adiabatic Fluctuations from Cosmic Defects Primordial Adiabatic Fluctuations from Cosmic Defects

2000-02-22

arxiv.org/abs/astro-ph/0002413v2

Phys.Rev.Lett. 85 (2000) 1370-1373

Astronomy and Astrophysics

Astrophysics

5 LaTeX pages, no figures; version to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.1370

We point out that in the context of ``two-metric'' theories of gravity there is the possibility that cosmic defects will produce a spectrum of primordial adiabatic density perturbations. This will happen when the speed characterising the defect-producing scalar field is much larger than the speed characterising gravity and all standard model particles. This model will exactly mimic the standard predictions of inflationary models, with the exception of a small non-Gaussian signal which could be detected by future experiments. We briefly discuss defect evolution in these scenarios and analyze their cosmological consequences.

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