Cosmic String Interpretation of NANOGrav Pulsar Timing Data

Ellis, John; Lewicki, Marek

doi:10.1103/physrevlett.126.041304

Cited by 252 publications

(209 citation statements)

References 73 publications

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“…Let's point out that our fit is consistent with ref. [92], e.g., Gµ ∼ 2.7 × 10 −10 is disfavored at 2σ, however, we get the strain amplitude value slightly lower than ref. [92].…”

Section: Jhep05(2021)211contrasting

confidence: 78%

“…[92], e.g., Gµ ∼ 2.7 × 10 −10 is disfavored at 2σ, however, we get the strain amplitude value slightly lower than ref. [92]. The new JHEP05(2021)211 NANOGrav 12.5 yr data [91] though consistent with previous EPTA data [149], they are in tension with previous limits from PPTA [150] and a previous NANOGrav analysis of their 11 yr data [151].…”

Section: Jhep05(2021)211contrasting

confidence: 78%

“…Unequivocally, GW probe of BSM models has become more interesting after the new NANOGrav analysis of 12.5 yrs pulsar timing data [91] which reports a strong evidence for a stochastic common-spectrum process and may be interpreted as a GW signal at frequency f ∼ 1/yr. The new data is better fitted with cosmic string models [92][93][94] than the single value power spectral density as suggested by the models of supermassive black hole (SMBHs). For the other interpretations of the NANOGrav data, e.g., primordial black holes, dark phase transition and inflation please see refs.…”

Section: Introductionmentioning

confidence: 86%

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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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“…Let's point out that our fit is consistent with ref. [92], e.g., Gµ ∼ 2.7 × 10 −10 is disfavored at 2σ, however, we get the strain amplitude value slightly lower than ref. [92].…”

Section: Jhep05(2021)211contrasting

confidence: 78%

Section: Jhep05(2021)211contrasting

confidence: 78%

Section: Introductionmentioning

confidence: 86%

See 1 more Smart Citation

Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis

Samanta

Datta

2021

J. High Energ. Phys.

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“…A few months ago, the NANOGrav collaboration has reported evidence for a stochastic process at nanohertz frequencies [31], which has been interpreted as SGWB in a large number of recent papers. Possible cosmological interpretations include stable [32,33] as well as metastable strings [34]. In the latter case an analysis of the NANOGrav data deduced a monopole-string-tension ratio in the range 7.8 ≤ √ κ ≤ 9.0 (2σ CL).…”

Section: Jhep04(2021)168mentioning

confidence: 97%

Metastable strings and dumbbells in supersymmetric hybrid inflation

Buchmüller

2021

J. High Energ. Phys.

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We study symmetry breaking and topological defects in a supersymmetric model with gauge group U(2), which can be identified with the right-handed part SU(2)R× U(1)B−L of an extended electroweak symmetry of the Standard Model. The model has two phases of hybrid inflation terminated by tachyonic preheating where either monopoles and strings or, alternatively, dumbbells are formed. In the first case a stochastic gravitational wave background is predicted in the LIGO-Virgo band, possibly extending to the LISA frequency band and to nanohertz frequencies, which is generated by a metastable cosmic string network. In the second case no topological defects survive inflation and no stochastic gravitational wave background is produced.

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“…The radiation of gravitational waves from the CS was considered in the works [19,106,107]. There was also an interpretation of NANOGrav signal as a manifestation of CS [108].…”

Section: Gravitational Waves From Cosmic Strings: Generation Mechanism and Possible Detection Methodsmentioning

confidence: 99%

Space fabric wrinkles: history of observational searches for exotic structures in the Universe

Sazhin

Sazhina

2021

Riv. Nuovo Cim.

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The paper consistently presents the history and methodology of observational searches for cosmic strings of various nature. Cosmic strings are one-dimensional extended objects predicted by modern cosmology, which, however, have not yet been detected with a high degree of confidence. The presence of cosmic strings changes the global geometry of the Universe and could serve as a unique proof of higher-dimensional theories. The properties and features of these cosmological objects from the point of view of observational astronomy are discussed. The presentation is preceded by a brief mathematical theory of cosmic strings.

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Cosmic String Interpretation of NANOGrav Pulsar Timing Data

Cited by 252 publications

References 73 publications

Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis

Gravitational wave complementarity and impact of NANOGrav data on gravitational leptogenesis

Metastable strings and dumbbells in supersymmetric hybrid inflation

Space fabric wrinkles: history of observational searches for exotic structures in the Universe

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