The Probability Distribution of Astrophysical Gravitational-Wave Background Fluctuations

Ginat, Yonadav Barry; Desjacques, Vincent; Reischke, Robert; Perets, Hagai B.

doi:10.48550/arxiv.1910.04587

Cited by 3 publications

(3 citation statements)

References 45 publications

(63 reference statements)

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“…Residual non-Gaussianities and non-stationarities may be present due to instrumental glitches and the subtraction procedure of thee resolved sources[40]. To account for this, it is possible to include additional parameters in the model for the power spectral density.…”

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confidence: 99%

Foreground cleaning and template-free stochastic background extraction for LISA

Pieroni

Barausse

2020

J. Cosmol. Astropart. Phys.

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Based on the rate of resolved stellar origin black hole and neutron star mergers measured by LIGO and Virgo, it is expected that these detectors will also observe an unresolved Stochastic Gravitational Wave Background (SGWB) by the time they reach design sensitivity. A background from the same class of sources also exists in the LISA band, which will be observable by LISA with signal-to-noise ratio (SNR) ∼ 121. Unlike the stochastic signal from Galactic white dwarf binaries, for which a partial subtraction is expected to be possible by exploiting its yearly modulation (induced by the motion of the LISA constellation), the background from unresolved stellar origin black hole and neutron star binaries acts as a foreground for other stochastic signals of cosmological or astrophysical origin, which may also be present in the LISA band. Here, we employ a principal component analysis to model and extract an additional hypothetical SGWB in the LISA band, without making any a priori assumptions on its spectral shape. At the same time, we account for the presence of the foreground from stellar origin black holes and neutron stars, as well as for possible uncertainties in the LISA noise calibration. We find that our technique leads to a linear problem and is therefore suitable for fast and reliable extraction of SGWBs with SNR up to ten times weaker than the foreground from black holes and neutron stars, quite independently of the SGWB spectral shape.

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confidence: 99%

Foreground cleaning and template-free stochastic background extraction for LISA

Pieroni

Barausse

2020

J. Cosmol. Astropart. Phys.

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“…Progress has been made in recent years to address this important issue of distinguishing a cosmological SGWB from its astrophysical counterpart. The potential solutions include: identify and subtract astrophysical sources using information from future GW detectors with improved resolutions [160][161][162]; optimized statistical analysis beyond the conventional cross-correlation method [163][164][165]; utilize spectral information over a wide frequency band [113,159,[166][167][168][169][170][171][172]. Detailed discussions on this subject can be found in e.g.…”

Section: Distinguish From Other Sgwb Sourcesmentioning

confidence: 99%

Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology

Chang,

Cui

2021

Preprint

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Global cosmic strings are predicted in many motivated extensions to the Standard Model of particle physics, with close connections to axion dark matter physics. Recent studies suggest that, although subdominant relative to Goldstone emission, gravitational wave (GW) signals from global strings can be detectable with current and planned GW detectors such as LIGO, LISA, DECIGO/BBO, ET/CE and AEDGE/AION, as well as pulsar timing arrays such as PPTA, NANOGrav and SKA. This work is an extensive, updated study on GWs from a global cosmic string network, taking into account of the most recent developments related to the subject. The main analysis is based on the analytical Velocity-dependent One-Scale (VOS) model calibrated with recent simulation results, which provides a generic protocol for such calculations with details given. We also demonstrate how the GW signal can be influenced with variations to the baseline model: this includes considering the uncertainties of model parameters and the potential deviation from the conventional VOS model prediction (i.e. the scaling behavior) as suggested by some of the recent simulation results. Furthermore, we investigated in detail the effect of a non-standard cosmology (e.g. early matter domination or kination) or new particle species on the GW signals from global strings. We demonstrate that the frequency spectrum of GW background from global cosmic strings can be used to probe the cosmic history prior to the Big Bang nucleosynthesis (BBN) (i.e. the primordial dark age) up to a temperature of T ∼ 10 8 GeV.

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“…To find what g 2 rel at each point X is, one needs to superpose all the waves, each weighted by its source's distance from X. This problem has been considered in the past by [41][42][43], and the upshot is that, if the number of sources is finite, then the probability of g 2 rel being higher than h is ∼ h −3 , for large h. Thus,…”

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confidence: 99%

Multiple-Scales Approach to The Averaging Problem in Cosmology

Ginat

2020

Preprint

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The Universe is homogeneous and isotropic on large scales, so on those scales it is usually modelled as a Friedmann-Lemaître-Robertson-Walker (FLRW) space-time.The non-linearity of the Einstein field equations raises concern over averaging over small-scale deviations form homogeneity and isotropy, with possible implications on the applicability of the FLRW metric to the Universe, even on large scales. Here I present a technique, based on the multiple-scales method of singular perturbation theory, to handle the small-scale inhomogeneities consistently. I obtain a leading order effective Einstein equation for the large-scale space-time metric, which contains a back-reaction term. The derivation of this equation is done in harmonic gauge, and conversion to other gauges is discussed. I estimate the magnitude of the backreaction term relative to the critical density of the Universe in an example, and find it to be of the order of a few percent.

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The Probability Distribution of Astrophysical Gravitational-Wave Background Fluctuations

Cited by 3 publications

References 45 publications

Foreground cleaning and template-free stochastic background extraction for LISA

Foreground cleaning and template-free stochastic background extraction for LISA

Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology

Multiple-Scales Approach to The Averaging Problem in Cosmology

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