Measurement of parity violation in the early universe using gravitational-wave detectors

被引:81
作者
Crowder, S. G. [1 ]
Namba, R. [1 ]
Mandic, V. [1 ]
Mukohyama, S. [2 ]
Peloso, M. [1 ,3 ]
机构
[1] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA
[2] Univ Tokyo, Todai Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan
[3] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
基金
美国国家科学基金会;
关键词
Stochastic gravitational-wave background; Gravitational-wave detector; Parity violation; Axion inflation; INFLATION;
D O I
10.1016/j.physletb.2013.08.077
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:66 / 71
页数:6
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