Distinguishing Causal Seeds from Inflation

Details Distinguishing Causal Seeds from Inflation Distinguishing Causal Seeds from Inflation

1996-05-30

arxiv.org/abs/astro-ph/9605193v2

Phys.Rev.D55:3288-3302,1997

Astronomy and Astrophysics

Astrophysics

22pgs, revtex, 5 figs.; revision clarifies discussion of astro-ph/9604172, includes new supporting sections on assumptions and

Scientific paper

10.1103/PhysRevD.55.3288

Causal seed models, such as cosmological defects, generically predict a distinctly different structure to the CMB power spectrum than inflation, due to the behavior of the perturbations outside the horizon. We provide a general analysis of their causal generation from isocurvature initial conditions by analyzing the role of stress perturbations and conservation laws in the causal evolution. Causal stress perturbations tend to generate an isocurvature pattern of peak heights in the CMB spectrum and shift the first compression, i.e.~main peak, to smaller angular scales than in the inflationary case, unless the pressure and anisotropic stress fluctuations balance in such a way as to reverse the sense of gravitational interactions while also maintaining constant gravitational potentials. Aside from this case, these causal seed models can be cleanly distinguished from inflation by CMB experiments currently underway.

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