期刊
PHYSICS LETTERS B
卷 726, 期 1-3, 页码 66-71出版社
ELSEVIER
DOI: 10.1016/j.physletb.2013.08.077
关键词
Stochastic gravitational-wave background; Gravitational-wave detector; Parity violation; Axion inflation
资金
- NSF [PHY1204944]
- DOE at the University of Minnesota [E-FG02-94ER-40823]
- Japan-Russia Research Cooperative Program [24540256, 21111006]
- WPI Initiative, MEXT, Japan
- University and the INFN of Padua
- Grants-in-Aid for Scientific Research [21111006, 24540256] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Physics [1204944] Funding Source: National Science Foundation
A stochastic gravitational-wave background (SGWB) is expected to arise from the superposition of many independent and unresolved gravitational-wave signals, of either cosmological or astrophysical origin. Some cosmological models (characterized, for instance, by a pseudo-scalar inflaton, or by some modification of gravity) break parity, leading to a polarized isotropic SGWB. We present the first upper limit on this parity violation from direct gravitational-wave measurements by measuring polarization of the SGWB in recent LIGO data and by assuming a generic power-law SGWB spectrum across the LIGO-sensitive frequency region. We also estimate sensitivity to parity violation for future generations of gravitational-wave detectors, both for a power-law spectrum and for a specific model of axion inflation. Since astrophysical sources are not expected to produce a polarized SGWB, measurements of polarization in the SGWB would provide a new way of differentiating between the cosmological and astrophysical SGWB sources. (C) 2013 Elsevier B.V. All rights reserved.
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