Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-09-14
Phys.Rev.D80:103520,2009
Physics
High Energy Physics
High Energy Physics - Theory
9 pages, 1 figure
Scientific paper
10.1103/PhysRevD.80.103520
Non-gaussianity in the microwave background radiation is bound to play a key role in giving us clues about the physics of the very early universe. However, the associated calculations, at second and even third order in perturbation theory, tend to be complicated to the point of obscuring simple underlying physical processes. In this note, we present a simple analytic procedure for approximating the non-linearity parameters f_{NL} and g_{NL} for cyclic models in which the cosmological perturbations are generated via the entropic mechanism. Our approach is quick, physically transparent and agrees well with the results of numerical calculations.
Lehners Jean-Luc
Steinhardt Paul J.
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