QCD axion and gravitational waves in light of NANOGrav results

Ramberg, Nicklas; Visinelli, Luca

doi:10.1103/physrevd.103.063031

Cited by 31 publications

(17 citation statements)

References 132 publications

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“…Searches for proton decay provide a complimentary probe of symmetry breaking chains, as chains that allow for proton decay can be chains that do not predict strings [328]. Furthermore, there has been a growing interest in gravitational wave from global/axion topological defects due to the close connection to axion or axion-like (ALP) dark matter physics [279,293,304,305,329,330]: when PQ symmetry breaking occurs after inflation, these topological defects are indispensable companion of axion particles. While there have been extensive studies on axion particle detection which strongly depend on whether/how axion couples to the SM particles in an observable manner, the GW signature from axion strings/domain walls is universal and could be a highly complementary probe for axion physics.…”

Section: Topological Defectsmentioning

confidence: 99%

Detection of Early-Universe Gravitational Wave Signatures and Fundamental Physics

Caldwell,

Cui,

Guo

et al. 2022

Preprint

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Detection of a gravitational-wave signal of non-astrophysical origin would be a landmark discovery, potentially providing a significant clue to some of our most basic, big-picture scientific questions about the Universe. In this white paper, we survey the leading early-Universe mechanisms that may produce a detectable signal -including inflation, phase transitions, topological defects, as well as primordial black holes -and highlight the connections to fundamental physics. We review the complementarity with collider searches for new physics, and multimessenger probes of the large-scale structure of the Universe.

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Section: Topological Defectsmentioning

confidence: 99%

Detection of Early-Universe Gravitational Wave Signatures and Fundamental Physics

Caldwell,

Cui,

Guo

et al. 2022

Preprint

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“…(For other explanations for the sources of the NANAGrav signal, see Ref. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].) The nanohertz frequencies of SIGWs constrain the masses of PBHs to stellar mass, and these stellar mass PBHs, on the other hand, may be the sources of the GWs detected by the Laser Interferometer Gravitational Wave Observatory (LIGO) Scientific Collaboration and the Virgo Collaboration [25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

NANOGrav signal and LIGO-Virgo Primordial Black Holes from the Higgs field

Yi,

Zhu

2021

Preprint

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We show that the NANOGrav signal can come from the Higgs inflation with a noncanonical kinetic term in terms of the scalar induced gravitational waves. The scalar induced gravitational waves generated in our model are also detectable by space based gravitational wave observatories. Primordial black holes with stellar masses that can explain LIGO-Virgo events are also produced. Therefore, the NANOGrav signal and the BHs in LIGO-Virgo events may both originate from the Higgs field.

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“…Scalar fields stand out as the simplest proposed candidates to explain some issues in physics, as, for instance, the abundance of dark matter [27] and the strong-CP problem [28,29]. Related to the latter, some attempts suggested the axion hypothesis to elucidate the recent reported results of North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration [30,31]. Moreover, scalar waves have been extensively studied in the investigation of absorption and scattering by black holes [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Absorption by stringy black holes

2021

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We investigate the absorption of planar massless scalar waves by a charged rotating stringy black hole, namely a Kerr–Sen black hole. We compute numerically the absorption cross section and compare our results with those of the Kerr–Newman black hole, a classical general relativity solution. In order to better compare both charged black holes, we define the ratio of the black hole charge to the extreme charge as Q. We conclude that Kerr–Sen and Kerr–Newman black holes have a similar absorption cross section, with the difference increasing for higher values of Q.

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QCD axion and gravitational waves in light of NANOGrav results

Cited by 31 publications

References 132 publications

Detection of Early-Universe Gravitational Wave Signatures and Fundamental Physics

Detection of Early-Universe Gravitational Wave Signatures and Fundamental Physics

NANOGrav signal and LIGO-Virgo Primordial Black Holes from the Higgs field

Absorption by stringy black holes

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