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

被引：80

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

来源：

PHYSICS LETTERS B | 2013年 / 726卷 / 1-3期

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

页码：66 / 71

页数：6

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