Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-18
Phys.Rev.D62:123513,2000
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures, revtex, In Press Physical Review D 2000
Scientific paper
10.1103/PhysRevD.62.123513
We investigate to what extent future microwave background experiments might be able to detect a suppression of fluctuation power on large scales in flat and open universe models. Such suppression would arise if fluctuations are generated by causal processes, and a measurement of a small suppression scale would be problematic for inflation models, but consistent with many defect models. More speculatively, a measurement of a suppression scale of the order of the present Hubble radius could provide independent evidence for a fine-tuned inflation model leading to a low-density universe. We find that, depending on the primordial power spectrum, a suppression scale modestly larger than the visible Horizon can be detected, but that the detectability drops very rapidly with increasing scale. For models with two periods of inflation, there is essentially no possibility of detecting a causal suppression scale.
Berera Arjun
Heavens Alan F.
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