期刊
PHYSICAL REVIEW D
卷 91, 期 8, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.083527
关键词
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资金
- Berkeley Center for Theoretical Physics
- National Science Foundation [1002399, 0855653, 0756174]
- fqxi Grant [RFP3-1004]
- New Frontiers in Astronomy and Cosmology
- Princeton Center for Theoretical Science
- U.S. Department of Energy [DE-AC02-05CH11231]
- DOE Early Career Award [DE-FG02-12ER41854]
- NSF Grant [PHY-1068380]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1214644] Funding Source: National Science Foundation
We assess two potential signals of the formation of our universe by the decay of a false vacuum. Negative spatial curvature is one possibility, but the window for its detection is now small. However, another possible signal is a suppression of the cosmic microwave background (CMB) power spectrum at large angles. This arises from the steepening of the effective potential as it interpolates between a flat inflationary plateau and the high barrier separating us from our parent vacuum. We demonstrate that these two effects can be parametrically separated in angular scale. Observationally, the steepening effect appears to be excluded at large l; but it remains consistent with the slight lack of power below l approximate to 30 found by the WMAP and Planck collaborations. We give two simple models which improve the fit to the Planck data; one with observable curvature and one without. Despite cosmic variance, we argue that future CMB polarization and most importantly large-scale structure observations should be able to corroborate the Planck anomaly if it is real. If we further assume the specific theoretical setting of a landscape of metastable vacua, as suggested by string theory, we can estimate the probability of seeing a low-l suppression in the CMB. There are significant theoretical uncertainties in such calculations, but we argue the probability for a detectable suppression may be as large as O(1), and in general is significantly larger than the probability of seeing curvature.
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