Reconstructing the spectral shape of a stochastic gravitational wave background with LISA

被引：188

作者：

Caprini, Chiara ^{[1
]}

Figueroa, Daniel G. ^{[2
]}

Flauger, Raphael ^{[3
]}

Nardini, Germano ^{[4
]}

Peloso, Marco ^{[5
,6
]}

Pieroni, Mauro ^{[7
]}

Ricciardone, Angelo ^{[6
]}

Tasinato, Gianmassimo ^{[8
]}

机构：

[1] Univ Paris Diderot, CNRS, Lab Astroparticule & Cosmol, UMR 7164, 10 Rue Alice Domon & Leonie Duquet, F-75013 Paris, France

[2] Ecole Polytech Fed Lausanne, LPPC, Inst Phys, CH-1015 Lausanne, Switzerland

[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[4] Univ Stavanger, Fac Sci & Technol, N-4036 Stavanger, Norway

[5] Univ Padua, Dipartimento Fis & Astron G Galilei, Via Marzolo 8, I-35131 Padua, Italy

[6] INFN, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy

[7] Univ Autonoma Madrid Cantoblanco, Inst Fis Teor UAM CSIC, C Nicolas Cabrera 13-15, Madrid 28049, Spain

[8] Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2019年 / 11期

基金：

瑞士国家科学基金会; 欧盟地平线“2020”;

关键词：

gravitational waves / experiments; primordial gravitational waves (theory); RADIATION;

D O I：

10.1088/1475-7516/2019/11/017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a set of tools to assess the capabilities of LISA to detect and reconstruct the spectral shape and amplitude of a stochastic gravitational wave background (SGWB). We first provide the LISA power-law sensitivity curve and binned power-law sensitivity curves, based on the latest updates on the LISA design. These curves are useful to make a qualitative assessment of the detection and reconstruction prospects of a SGWB. For a quantitative reconstruction of a SGWB with arbitrary power spectrum shape, we propose a novel data analysis technique: by means of an automatized adaptive procedure, we conveniently split the LISA sensitivity band into frequency bins, and fit the data inside each bin with a power law signal plus a model of the instrumental noise. We apply the procedure to SGWB signals with a variety of representative frequency profiles, and prove that LISA can reconstruct their spectral shape. Our procedure, implemented in the code SGWBinner, is suitable for homogeneous and isotropic SGWBs detectable at LISA, and it is also expected to work for other GW observatories.

引用

页数：38

共 154 条

[11] Large tensor non-Gaussianity from axion-gauge field dynamics [J].