Evidence for different gravitational-wave sources in the NANOGrav dataset

Bian, Ligong; Cai, Rong-Gen; Liu, Jing; Yang, Xing-Yu; Zhou, Ruiyu

doi:10.1103/physrevd.103.l081301

Cited by 79 publications

(63 citation statements)

References 51 publications

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“…It is important to note that the induced GWs are not the only explanations of the NANOGrav results. For example, among many others, possible candidates are cosmic strings [328][329][330][331] and first order phase transitions [332][333][334][335][336][337][338][339]. Within the next decades, we expect to have more information from PTA experiments.…”

Section: Current and Future Observational Prospectsmentioning

confidence: 99%

“…We also expect the GW detector LISA to launch. In order to distinguish these candidates to the NANOGrav data, we will need better resolution for a better Bayesian analysis [336] but crucially we will need other discriminators of cosmic GWs. In the case of induced GWs, if some of the LIGO binary black hole mergers are found to be PBHs, the NANOGrav signal would have a strong case to be induced GWs.…”

Section: Current and Future Observational Prospectsmentioning

confidence: 99%

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Scalar Induced Gravitational Waves Review

2021

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We provide a review on the state-of-the-art of gravitational waves induced by primordial fluctuations, so-called induced gravitational waves. We present the intuitive physics behind induced gravitational waves and we revisit and unify the general analytical formulation. We then present general formulas in a compact form, ready to be applied. This review places emphasis on the open possibility that the primordial universe experienced a different expansion history than the often assumed radiation dominated cosmology. We hope that anyone interested in the topic will become aware of current advances in the cosmology of induced gravitational waves, as well as becoming familiar with the calculations behind.

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Section: Current and Future Observational Prospectsmentioning

confidence: 99%

Section: Current and Future Observational Prospectsmentioning

confidence: 99%

Scalar Induced Gravitational Waves Review

2021

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“…For the other interpretations of the NANOGrav data, e.g., primordial black holes, dark phase transition and inflation please see refs. [95][96][97][98][99][100][101][102][103][104][105].…”

Section: Introductionmentioning

confidence: 99%

Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis

Samanta

Datta

2021

J. High Energ. Phys.

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In seesaw mechanism, if right handed (RH) neutrino masses are generated dynamically by a gauged U(1) symmetry breaking, a stochastic gravitational wave background (SGWB) sourced by a cosmic string network could be a potential probe of leptogenesis. We show that the leptogenesis mechanism that facilitates the dominant production of lepton asymmetry via the quantum effects of right-handed neutrinos in gravitational background, can be probed by GW detectors as well as next-generation neutrinoless double beta decay (0νββ) experiments in a complementary way. We infer that for a successful leptogenesis, an exclusion limit on f − ΩGWh2 plane would correspond to an exclusion on the |mββ| − m1 plane as well. We consider a normal light neutrino mass ordering and discuss how recent NANOGrav pulsar timing data (if interpreted as GW signal) e.g., at 95% CL, would correlate with the potential discovery or null signal in 0νββ decay experiments.

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“…(4.11). 13 We have so far considered the case N = 1 corresponding to the usually considered total number of RH neutrinos N = 3. However, we can also study how the GW signal changes with increasing N .…”

Section: Jhep10(2021)193mentioning

confidence: 99%

“…The possibility that a low scale dark phase transition may address the NANOGrav result has been recently considered in ref. [12] (see also [13] for a Bayesian analysis comparing it with other explanations) and, more specifically, within a Majoron model with nonrenormalizable effective operators in ref. [14].…”

Section: Jhep10(2021)193 1 Introductionmentioning

confidence: 99%

Gravitational waves from first-order phase transitions in Majoron models of neutrino mass

Bari

Marfatia

Zhou

2021

J. High Energ. Phys.

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We show how the generation of right-handed neutrino masses in Majoron models may be associated with a first-order phase transition and accompanied by the production of a stochastic background of gravitational waves (GWs). We explore different energy scales with only renormalizable operators in the effective potential. If the phase transition occurs above the electroweak scale, the signal can be tested by future interferometers. We consider two possible energy scales for phase transitions below the electroweak scale. If the phase transition occurs at a GeV, the signal can be tested at LISA and provide a complementary cosmological probe to right-handed neutrino searches at the FASER detector. If the phase transition occurs below 100 keV, we find that the peak of the GW spectrum is two or more orders of magnitude below the putative NANOGrav GW signal at low frequencies, but well within reach of the SKA and THEIA experiments. We show how searches of very low frequency GWs are motivated by solutions to the Hubble tension in which ordinary neutrinos interact with the dark sector. We also present general calculations of the phase transition temperature and Euclidean action that apply beyond Majoron models.

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Evidence for different gravitational-wave sources in the NANOGrav dataset

Cited by 79 publications

References 51 publications

Scalar Induced Gravitational Waves Review

Scalar Induced Gravitational Waves Review

Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis

Gravitational waves from first-order phase transitions in Majoron models of neutrino mass

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