Gravitational wave anisotropies from primordial black holes

Bartolo, N.; Bertacca, Daniele; Luca, Valerio De; Franciolini, Gabriele; Matarrese, S.; Peloso, Marco; Ricciardone, Angelo; Riotto, Antonio; Tasinato, Gianmassimo

doi:10.1088/1475-7516/2020/02/028

Cited by 86 publications

(92 citation statements)

References 75 publications

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“…Such an enhancement of the curvature perturbations are often considered in the context of the primordial black hole (PBH) [23][24][25] (see also Refs. [7,[26][27][28][29][30][31]). PBHs have recently been studied by many authors mainly because they can be a dark matter (DM) candidate and may explain the binary black hole merger events observed by LIGO/Virgo [32].…”

Section: Introductionmentioning

confidence: 99%

Gauge independence of induced gravitational waves

2020

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We study gauge (in)dependence of the gravitational waves (GWs) induced from curvature perturbations. For the GWs produced in a radiation-dominated era, we find that the observable (late-time) GWs in the TT gauge and in the Newtonian gauge are the same in contrast to a claim in the literature. We also mention the interpretation of the gauge dependence of the tensor perturbations which appears in the context of the induced GWs. arXiv:1912.00785v3 [gr-qc] 6 Jan 2020 1 It is also called the second-order GWs, secondary GWs, or scalar-induced GWs, etc.

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Section: Introductionmentioning

confidence: 99%

Gauge independence of induced gravitational waves

2020

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“…In close analogy to the analysis of CMB photons, we can now ♦4 See Refs. [7][8][9][10][11][12][13] for related analysis of the anisotropies of the SGWB. ♦5 For inflationary GWs, we take "source time" labeled by "s" to be when the relevant GWs are well inside the horizon.…”

Section: Intuitive Explanation Of the Resultsmentioning

confidence: 99%

“…The result for the SW term in ∆lnf (1) is in particular consistent with the results derived in Refs. [7,12].…”

Section: A2 Step 1: Gw Spectrum At the Sourcing Timementioning

confidence: 99%

“…in [6]. For the stochastic background, these effects have been shown to modify and generate anisotropic contributions of the SGWB [7][8][9][10][11][12][13][14] and to lead to a decoherence of the phase information in the SGWB which becomes relevant when probing the three-point function of GWs [15,16]. ♦1 Here, given the limited angular resolution of GW detectors, we instead focus on the isotropic component of the GW power spectrum.…”

Section: Introductionmentioning

confidence: 99%

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Deformation of the gravitational wave spectrum by density perturbations

Domcke

Jinno

Rubira

2020

J. Cosmol. Astropart. Phys.

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We study the effect of primordial scalar curvature perturbations on the propagation of gravitational waves over cosmic distances. We point out that such curvature perturbations deform the isotropic spectrum of any stochastic background of gravitational waves of primordial origin through the (integrated) Sachs-Wolfe effect. Computing the changes in the amplitude and frequency of the propagating gravitational wave induced at linear order by scalar curvature perturbations, we show that the resulting deformation of each frequency bin of the gravitational wave spectrum is described by a linearly biased Gaussian with the variance σ 2 d lnk ∆ 2 R , where ∆ 2 R (k) denotes the amplitude of the primordial curvature perturbations. The linear bias encodes the correlations between the changes induced in the frequency and amplitude of the gravitational waves. Taking into account the latest bounds on ∆ 2 R from primordial black hole and gravitational wave searches, we demonstrate that the resulting O(σ) deformation can be significant for extremely peaked gravitational wave spectra. We further provide an order of magnitude estimate for broad spectra, for which the net distortion is O(σ 2 ).

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“…However, the GW detectors would detect GWs from different directions, resulting in angular anisotropies of the SIGW signal. This was studied in [141]. In the absence of primordial non-Gaussianities, the authors found that the anisotropies are negligible by today due to the propagation effects.…”

Section: Scalar-induced Gravitational Wavesmentioning

confidence: 99%

Probing primordial–black-hole dark matter with scalar induced gravitational waves

2019

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The possibility that primordial black holes (PBHs) represent all of the dark matter (DM) in the Universe and explain the coalescences of binary black holes detected by LIGO/Virgo has attracted a lot of attention. PBHs are generated by the enhancement of scalar perturbations which inevitably produce the induced gravitational waves (GWs). We calculate the induced GWs up to the thirdorder correction which not only enhances the amplitude of induced GWs, but also extends the cutoff frequency from 2k * to 3k * . Such effects of the third-order correction lead to an around 10% increase of the signal-to-noise ratio (SNR) for both LISA and pulsar timing array (PTA) observations, and significantly widen the mass range of PBHs in the stellar mass window accompanying detectable induced GWs for PTA observations including IPTA, FAST and SKA. On the other hand, the null detections of the induced GWs by LISA and PTA experiments will exclude the possibility that all of the DM is comprised of PBHs and the GW events detected by LIGO/Virgo are generated by PBHs.

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Gravitational wave anisotropies from primordial black holes

Cited by 86 publications

References 75 publications

Gauge independence of induced gravitational waves

Gauge independence of induced gravitational waves

Deformation of the gravitational wave spectrum by density perturbations

Probing primordial–black-hole dark matter with scalar induced gravitational waves

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