Gravitational waves from dark matter isocurvature

Domènech, Guillem; Passaglia, Samuel; Renaux‐Petel, Sébastien

doi:10.1088/1475-7516/2022/03/023

Cited by 31 publications

(23 citation statements)

References 133 publications

(200 reference statements)

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“…Oscillon isocurvature perturbations could lead to yet another source of induced GWs (e.g. [65,66]), study of which we leave for future work [67]. Hence, GW signal estimates in this study are conservative.…”

Section: Plmentioning

confidence: 99%

Enhanced Gravitational Waves from Inflaton Oscillons

Lozanov¹,

Takhistov²

2022

Preprint

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In broad classes of inflationary models the period of accelerated expansion is followed by fragmentation of the inflaton scalar field into localized, long-lived and massive oscillon excitations. We demonstrate that matter-dominance of oscillons, followed by their rapid decay, significantly enhances the primordial gravitational wave (GW) spectrum. These oscillon-induced GWs are distinct and could be orders of magnitude lower in frequency than the previously considered GWs associated with oscillon formation. We show that detectable oscillon-induced GW signatures establish direct tests independent from cosmic microwave background radiation (CMB) for monodromy, logarithmic and pure natural (plateau) potential classes of inflationary models, among others. We demonstrate that oscillon-induced GWs in a model based on pure natural inflation could be directly observable with the Einstein Telescope, Cosmic Explorer and DECIGO. These signatures offer a new route for probing the underlying inflationary physics.

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Section: Plmentioning

confidence: 99%

Enhanced Gravitational Waves from Inflaton Oscillons

Lozanov¹,

Takhistov²

2022

Preprint

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“…The energy density spectra of SIGWs include valuable information about PBHs and primordial non-Gaussianity [56][57][58][59][60][61][62][63]. Furthermore, recent studies on SIGWs were also extended to include the gauge issue [64][65][66][67][68][69][70][71][72][73][74][75], dumping effect [76][77][78], epochs of the Universe [79][80][81][82][83][84][85][86][87][88][89][90], and modified gravity [91][92][93]. The relationship between SIGWs and PBH formation was first studied in Ref.…”

Section: %mentioning

confidence: 99%

Primordial black holes and third order scalar induced gravitational waves*

et al. 2023

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The process of Primordial black holess (PBHs) formation would be inevitably accompanied byscalar induced gravitational waves (SIGWs). This strong correlation between PBHs and SIGWssignals could be a promising approach to detecting PBHs in the upcoming gravitational wave (GW)experiments, such as Laser Interferometer Space Antenna (LISA). We investigate the third orderSIGWs during a radiation-dominated (RD) era in the case of a monochromatic primordial powerspectrum Pζ = Aζ k∗δ (k − k∗). For LISA observations, the relations between signal-to-noise ratio(SNR) and monochromatic primordial power spectrum are studied systematically. It shows that theeffects of third order SIGWs extend the cutoff frequency from 2f∗ to 3f∗ and lead to about 200%increase of the SNR for frequency band from 10−5Hz to 1.6 × 10−3Hz corresponding to PBHs withmass range 4 × 10−12M ∼ 10−7M. We find that there exists a critical value A∗ = 1.76 × 10−2for the amplitude of the monochromatic primordial power spectra, such that when Aζ > A∗, theenergy density of third order SIGWs will be larger than the energy density of second order SIGWs.

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“…β > β min . Otherwise, the production of induced GWs is very much suppressed and one needs very large isocurvature fluctuations [79].…”

Section: Gws After Pbh Domination and Evaporationmentioning

confidence: 99%

Gravitational wave hints black hole remnants as dark matter

Domènech

Sasaki

2023

Class. Quantum Grav.

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The end state of Hawking evaporation of a black hole is uncertain. Some candidate quantum gravity theories, such as loop quantum gravity and asymptotic safe gravity, hint towards Planck sized remnants. If so, the Universe might be filled with remnants of tiny primordial black holes, which formed with mass $M<10^9\,{\rm g}$. A unique scenario is the case of $M\sim 5\times10^5\,{\rm g}$, where tiny primordial black holes reheat the universe by Hawking evaporation and their remnants dominate the dark matter. Here, we point out that this scenario leads to a cosmological gravitational wave signal at frequencies $\sim 100{\rm Hz}$. Finding such a particular gravitational wave signature with, e.g., the Einstein Telescope, would suggest black hole remnants as dark matter.

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Gravitational waves from dark matter isocurvature

Cited by 31 publications

References 133 publications

Enhanced Gravitational Waves from Inflaton Oscillons

Enhanced Gravitational Waves from Inflaton Oscillons

Primordial black holes and third order scalar induced gravitational waves*

Gravitational wave hints black hole remnants as dark matter

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