Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-28
Phys.Rev.D69:083505,2004
Astronomy and Astrophysics
Astrophysics
13 pages
Scientific paper
10.1103/PhysRevD.69.083505
We generalize a recently proposed mechanism for the origin of primordial metric perturbations in inflationary models. Quantum fluctuations of light scalar fields during inflation give rise to super-horizon fluctuations of masses and reaction rates of various particles. Reheating, freeze-out, and matter-domination processes become inhomogeneous and generate super-horizon metric perturbations. We also calculate the degree of non-Gaussianity $f_{nl}$ for this new model of cosmological perturbations. The precise value of $f_{nl}$ depends on the specific models, but $|f_{nl}|\sim$few is a natural lower bound for our mechanisms. This is much larger than the currently assumed theoretical value $f_{nl}\sim tilt \lesssim 0.05$, and is thought to be observable. In a particularly attractive model of inhomogeneous mass-domination, the non-Gaussianity of perturbations generated by our mechanism is simply $f_{nl}=5$, irrespective of the detailed structure of the underlying field theory.
Dvali Gia
Gruzinov Andrei
Zaldarriaga Matias
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