Prospects for direct detection of primordial gravitational waves

被引:95
作者
Chongchitnan, S [1 ]
Efstathiou, G [1 ]
机构
[1] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
来源
PHYSICAL REVIEW D | 2006年 / 73卷 / 08期
关键词
D O I
10.1103/PhysRevD.73.083511
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the primordial gravitational wave background produced in models of single-field inflation. Using the inflationary flow approach, we investigate the amplitude of gravitational wave spectrum, omega(gw), in the frequency range 1 mHz-1 Hz pertinent to future space-based laser interferometers. For models that satisfy the current observational constraint on the tensor-to-scalar ratio, r less than or similar to 0.36, we derive a strict upper bound of omega(gw)less than or similar to 1.6x10(-15) independent of the form of the inflationary potential. Applying, in addition, the observational constraints on the spectral index n(s) and its running, omega(gw) is expected to be considerably lower than this bound unless the shape of the potential is finely tuned. We contrast our numerical results with those based on simple power-law extrapolation of the tensor power spectrum from cosmic microwave background (CMB) scales. In addition to single-field inflation, we summarize a number of other possible cosmological sources of primordial gravitational waves and assess what might be learned from direct detection experiments such as LISA, Big Bang Observer and beyond.
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页数:10
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