Description and Application of the Surfing Effect by Michele Maiorano, Francesco De Paolis, Achille A. Nucita

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Stochastic Gravitational-Wave Backgrounds: Current Detection Efforts and Future Prospects by Arianna I. Renzini, Boris Goncharov, Alexander C. Jenkins, Patrick M. Meyers

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Nanohertz gravitational waves from supergravity inflationary model with double-inflection-point by Tie-Jun Gao, Ke-Sheng Sun, Xiu-Yi Yang

“…Abstract Recently, the worldwide pulsar timing array(PTA) collaborations, such as the Chinese Pulsar Timing Array (CPTA), the European PulsarTiming Array (EPTA), the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) and the Parkers Pulsar Timing Array (PPTA) published the analysis of PTA data, which is consistent with the Hellings–Downs curve, thus provides evidence for the existence of stochastic gravitational wave backgrounds (SGWB). …”
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Looking out for the Galileon in the nanohertz gravitational wave sky by Reginald Christian Bernardo, Kin-Wang Ng

“…We study the polarizations induced by the Galileon as a stochastic gravitational wave background in the cross correlated power in a pulsar timing array. Working within Galileon gravity, we first show that the scalar gravitational wave signature of the Galileon is encoded solely in its effective mass, which is controlled by the bare mass, conformal coupling, and a tadpole. …”
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Dark baryon from pure Yang-Mills theory and its GW signature from cosmic strings by Masaki Yamada, Kazuya Yonekura

“…In particular, our model can simultaneously account for both abundance of DM and the recently reported gravitational wave signals detected in pulsar timing array experiments, including NANOGrav.…”
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Nanohertz gravitational waves from cosmic strings and dark photon dark matter by Naoya Kitajima, Kazunori Nakayama

“…The recent observations by pulsar timing array (PTA) experiments suggest the existence of stochastic gravitational wave background in the nano-Hz range. …”
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Revisiting metastable cosmic string breaking by Akifumi Chitose, Masahiro Ibe, Yuhei Nakayama, Satoshi Shirai, Keiichi Watanabe

“…In particular, it is relevant to the cosmic string interpretation of the gravitational wave signals recently reported by pulsar timing array experiments.…”
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Ultra-low-frequency Gravitational Waves from Massive Clusters at z ∼ 1 by David K. Wendt, Roger W. Romani

“…Recent progress with pulsar timing array experiments, especially from the NANOGrav collaboration, indicates that we are on the cusp of detecting significant signals from the inspiral of supermassive black hole (BH) binaries. …”
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Can the Gravitational Wave Background Feel Wiggles in Spacetime? by Gen Ye, Alessandra Silvestri

“…Recently the international pulsar timing array collaboration has announced the first strong evidence for an isotropic gravitational-wave background (GWB). …”
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The primordial black holes solution to the cosmological monopole problem by Xin-Zhe Wang, Can-Min Deng

“…Abstract Recently, the pulsar timing array (PTA) collaborations, including CPTA, EPTA, NANOGrav, and PPTA, announced that they detected a stochastic gravitational wave background spectrum in the nHz band. …”
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Extra-tensor-induced origin for the PTA signal: No primordial black hole production by Mohammad Ali Gorji, Misao Sasaki, Teruaki Suyama

“…Recently, pulsar timing array (PTA) collaborations announced evidence for an isotropic stochastic gravitational wave (GW) background. …”
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Population estimates for electromagnetically distinguishable supermassive binary black holes by Krolik, J, Volonteri, M, Dubois, Y, Devriendt, J

“…Roughly 10% should have periods short enough (<~5 yr) to detect the X-ray modulation; this is also the period range accessible to Pulsar Timing Array observations.…”

Multiple supermassive black hole systems: SKA’s future leading role by Deane, R, Paragi, Z, Jarvis, M, Coriat, M, Bernardi, G, Frey, S, Heywood, I, Klöckner, H

“…In addition, these observations will provide constraints on and an understanding of stochastic gravitational wave background detections in the pulsar timing array sensitivity band (nanoHz -microHz). …”

NANOGrav signal from the end of inflation and the LIGO mass and heavier primordial black holes by Amjad Ashoorioon, Kazem Rezazadeh, Abasalt Rostami

“…Releasing the 12.5-year pulsar timing array data, the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has recently reported the evidence for a stochastic common-spectrum which would herald the detection of a stochastic gravitational wave background (SGWB) for the first time. …”
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QCD-collapsed domain walls: QCD phase transition and gravitational wave spectroscopy by Yang Bai, Ting-Kuo Chen, Mrunal Korwar

“…The evidence of stochastic gravitational waves at nanohertz observed by pulsar timing array experiments suggests that the discrete-symmetry-breaking scale is around 100 TeV, assuming the domain-wall explanation. …”
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Primordial gravitational waves in the nano-Hertz regime and PTA data — towards solving the GW inverse problem by Eric Madge, Enrico Morgante, Cristina Puchades-Ibáñez, Nicklas Ramberg, Wolfram Ratzinger, Sebastian Schenk, Pedro Schwaller

“…Abstract In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. …”
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PBH-infused seesaw origin of matter and unique gravitational waves by Debasish Borah, Suruj Jyoti Das, Rome Samanta, Federico R. Urban

“…Thence, a low-frequency GW feature related to DM genesis and detectable with a pulsar-timing array must correspond to a mid- or high-frequency GW signature related to baryogenesis at interferometer scales.…”
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Gravitational wave signature of generic disappearance of Z 2-symmetry breaking domain walls by Piyali Banerjee, Urjit A. Yajnik

“…This frequency band is sensitive to pulsar timing array based experiments such as SKA and NANOGrav. …”
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Probing primordial black holes from a first order phase transition through pulsar timing and gravitational wave signals by Jan Tristram Acuña, Po-Yan Tseng

“…Abstract In this work, we assess the sensitivity reach of pulsar timing array (PTA) measurements to probe pointlike primordial black holes (PBHs), with an extended mass distribution, which originate from collapsed Fermi balls that are formed through the aggregation of asymmetric U(1) dark fermions trapped within false vacuum bubbles during a dark first order phase transition (FOPT). …”
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Differential Interferometric Signatures of Close Binaries of Supermassive Black Holes in Active Galactic Nuclei. II. Merged Broad-line Regions by Yu-Yang Songsheng, Jian-Min Wang

“…Once the CB-SMBH evolves to the stage where BLRs merge to form a circumbinary BLR, it will hopefully be resolved by the pulsar timing array in the near future as sources of nanohertz gravitational waves. …”
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