Measuring the primordial curvature perturbations from the scalar induced gravitational waves

Li, Jun; Guo, Guanghai

doi:10.1103/physrevd.107.043536

Cited by 6 publications

(10 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From our results, we conclude that if the PTA GWB signal is due to SIGWs, it hints at c 2 s > 1/3 or non-Gaussian primordial fluctuations (as shown in ref. [23], see also [28,34]), or both. It is interesting to note that while PTAs might not be very sensitive to the value of c s (or the non-Gaussian parameter f NL ), the PBH counterpart can reduce the allowed parameter space and prefer certain values of these parameters.…”

Section: Resultsmentioning

confidence: 99%

“…Even though the NANOGrav data has relatively large errors, the best frequency bins lie in the low frequency band, that is f ∼ 10 −9 -10 −8 Hz, and data seem to follow a blue tilted power-law, which is better fitted by the low frequency tail of SIGWs [22][23][24][25][26][27][28][29][30][31][32][33][34][35]. As argued in refs.…”

Section: Jcap10(2023)041mentioning

confidence: 99%

“…Importantly, a large amplitude of primordial fluctuations may lead to an overproduction of PBHs for some of the allowed parameter space [22][23][24][25][26][27][28][29][30][31][32][33][34][35][65][66][67], although some systematic uncertainties remain in the PBH calculation. See refs.…”

Section: Jcap10(2023)041mentioning

confidence: 99%

“…[68][69][70][71][72] for recent reviews on PBHs. One way to remedy this is to invoke large and negative non-Gaussianities of primordial fluctuations, which significantly suppress PBH formation [23] (see also [28,34]). For earlier works on the impact of local non-Gaussianities on the SIGWs see refs.…”

Section: Jcap10(2023)041mentioning

confidence: 99%

“…In the NANOGrav analysis [22], and many subsequent papers [23][24][25][26][27][28][29][30][31][32][33][34][35], it is assumed that SIGWs are generated by large primordial adiabatic fluctuations when the universe is dominated by an adiabatic perfect fluid of relativistic particles (see e.g. refs.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed

Balaji,

Domènech,

Franciolini

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Pulsar timing arrays gathered evidence of the presence of a gravitational wave background around nHz frequencies. If the gravitational wave background was induced by large and Gaussian primordial fluctuations, they would then produce too many sub-solar mass primordial black holes. We show that if at the time of gravitational wave generation the universe was dominated by a canonical scalar field, with the same equation of state as standard radiation but a higher propagation speed of fluctuations, one can explain the gravitational wave background with a primordial black hole counterpart consistent with observations. Lastly, we discuss possible ways to test this model with future gravitational wave detectors.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Jcap10(2023)041mentioning

confidence: 99%

Section: Jcap10(2023)041mentioning

confidence: 99%

Section: Jcap10(2023)041mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed

Balaji,

Domènech,

Franciolini

2023

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

Domènech,

Sasaki

2024

Class. Quantum Grav.

View full text Add to dashboard Cite

It is possible that primordial black holes constitute (or constituted) a significant fraction of the energy budget of our universe. Terrestrial gravitational wave detectors offer the opportunity to test the existence of primordial black holes in two different mass ranges, from $10^2\,{\rm g}-10^{16}\,{\rm g}$ to $10^{-6}\,M_\odot-100 \,M_\odot$. The first mass window is open via induced gravitational waves, and the second one is by gravitational waves from binary mergers. In this review, we outline and explain the different gravitational wave signatures of primordial black holes that may be probed by terrestrial gravitational wave detectors, such as the current LIGO/Virgo/KAGRA and future ones like Einstein Telescope and Cosmic Explorer. We mainly focus on the associated GW background signals and provide rough estimates for their typical frequency and amplitude. We also discuss complementary probes for these primordial black hole mass ranges.

show abstract

Gravitational wave constraints on the primordial black hole dominated early universe

Domènech

Lin

Sasaki

2021

J. Cosmol. Astropart. Phys.

105

View full text Add to dashboard Cite

We calculate the gravitational waves (GWs) induced by the density fluctuations due to the inhomogeneous distribution of primordial black holes (PBHs) in the case where PBHs eventually dominate and reheat the universe by Hawking evaporation. The initial PBH density fluctuations are isocurvature in nature. We find that most of the induced GWs are generated right after evaporation, when the universe transits from the PBH dominated era to the radiation dominated era and the curvature perturbation starts to oscillate wildly. The strongest constraint on the amount of the produced GWs comes from the big bang nucleosynthesis (BBN). We improve previous constraints on the PBH fraction and find that it cannot exceed 10-4. Furthermore, this maximum fraction decreases as the mass increases and reaches 10-12 for MPBH∼ 5×108 g, which is the largest mass allowed by the BBN constraint on the reheating temperature. Considering that PBH may cluster above a given clustering scale, we also derive a lower bound on the scale of clustering. Interestingly, the GW spectrum for MPBH∼ 104 -108 g enters the observational window of LIGO and DECIGO and could be tested in the future. Although we focus on the PBH dominated early universe in this paper, our methodology is applicable to any model with early isocurvature perturbation.

show abstract

Measuring the primordial curvature perturbations from the scalar induced gravitational waves

Cited by 6 publications

References 57 publications

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed

Scalar-induced gravitational wave interpretation of PTA data: the role of scalar fluctuation propagation speed

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

Gravitational wave constraints on the primordial black hole dominated early universe

Contact Info

Product

Resources

About