Has NANOGrav Found First Evidence for Cosmic Strings?

Blasi, Simone; Brdar, Vedran; Schmitz, Kai

doi:10.1103/physrevlett.126.041305

Cited by 242 publications

(176 citation statements)

References 76 publications

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“…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: 87%

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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Section: Introductionmentioning

confidence: 87%

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: 96%

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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“…These methods have not yet yielded clear results [60,61], although the results are expected in the next 2-5 years.…”

Section: Search By Cmb Anisotropymentioning

confidence: 97%

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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Has NANOGrav Found First Evidence for Cosmic Strings?

Cited by 242 publications

References 76 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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