Axiogenesis from $SU(2)_R$ phase transition

Harigaya, Keisuke; Wang, Isaac R.

doi:10.48550/arxiv.2107.09679

Cited by 3 publications

(5 citation statements)

References 36 publications

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“…Other axiogenesis scenarios are are also considered in the literature [64,65]. Baryon asymmetry may be dominantly produced at a temperature…”

Section: B − L Number Violation By New Physicsmentioning

confidence: 99%

Gravitational Wave and CMB Probes of Axion Kination

Co,

Dunsky,

Fernandez

et al. 2021

Preprint

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Rotations of an axion field in field space provide a natural origin for an era of kination domination, where the energy density is dominated by the kinetic term of the axion field, preceded by an early era of matter domination. Remarkably, no entropy is produced at the end of matter domination and hence these eras of matter and kination domination may occur even after Big Bang Nucleosynthesis.We derive constraints on these eras from both the cosmic microwave background and Big Bang Nucleosynthesis. We investigate how this cosmological scenario affects the spectrum of possible primordial gravitational waves and find that the spectrum features a triangular peak. We discuss how future observations of gravitational waves can probe the viable parameter space, including regions that produce axion dark matter by the kinetic misalignment mechanism or the baryon asymmetry by axiogenesis. For QCD axion dark matter produced by the kinetic misalignment mechanism, a modification to the inflationary gravitational wave spectrum occurs above 0.01 Hz and, for high values of the energy scale of inflation, the prospects for discovery are good. We briefly comment on implications for structure formation of the universe.

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“…Other axiogenesis scenarios are are also considered in the literature [64,65]. Baryon asymmetry may be dominantly produced at a temperature…”

Section: B − L Number Violation By New Physicsmentioning

confidence: 99%

Gravitational Wave and CMB Probes of Axion Kination

Co,

Dunsky,

Fernandez

et al. 2021

Preprint

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“…This specification need not necessarily predict new experimental signals. For example, this requirement only puts a lower bound on the masses of new particles in the models presented in [10,16], and possible signals may be pushed to unobservable energies. In RPV axiogenesis with an SU (5) texture, on the other hand, the requirement puts a lower bound on the RPV couplings, which sets a minimum proton decay rate.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…To explain the observed baryon asymmetry, new physics beyond the Standard Model (SM) and the QCD axion is therefore required; see Refs. [10,[14][15][16][17]. Requiring the correct baryon abundance without overproducing axion dark matter imposes constraints on this new physics.…”

mentioning

confidence: 99%

“…Unlike the B + L asymmetry of the minimal axiogenesis model, the B − L asymmetry is impervious to electroweak-sphaleron washout, and so it may be produced prior to the electroweak phase transition. (Effective) B −L violation from new physics is utilized also in the proposals in [15][16][17]. The resultant baryon asymmetry depends on the magnitude of RPV and the masses of supersymmetric particles, rather than the electroweak phase transition temperature.…”

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confidence: 99%

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R-Parity Violation Axiogenesis

Co,

Harigaya,

Johnson

et al. 2021

Preprint

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We show that the rotation of the QCD axion field, aided by B − L violation from supersymmetric R-parity violating couplings, can yield the observed baryon abundance. Strong sphaleron processes transfer the angular momentum of the axion field into a quark chiral asymmetry, which R-parity violating couplings convert to the baryon asymmetry of the Universe. We focus on the case of dimensionless R-parity violating couplings with textures motivated by grand unified theories and comment on more general scenarios. The axion decay constant and mass spectrum of supersymmetric particles are constrained by Big Bang nucleosynthesis, proton decay from the R-parity violation, and successful thermalization of the Peccei-Quinn symmetry breaking field. Axion dark matter may be produced by the axion rotation via the kinetic misalignment mechanism for axion decay constants below 10 10 GeV, or by the conventional misalignment mechanism for 10 11-12 GeV.The viable parameter region can be probed by proton decay and axion searches. This scenario may also have connections with collider experiments, including searches for long-lived particles, and observations of gravitational waves.

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“…The present work also contributes to the larger effort in the community to explore the different possibilities for the cosmological axion evolution which open up once the assumptions of the canonical misalignment picture are relaxed or modified. Indeed, a variety of such scenarios have been proposed in the literature, e. g., large [43][44][45][46] or small [47][48][49][50] misalignment angles, parametric resonance [51][52][53], kinetic misalignment mechanism [39,[54][55][56][57][58][59][60][61][62][63], trapped misalignment [64], axion fragmentation [65][66][67], varying axion decay constant [68], interaction with monopoles [69,70] or modifications in the cosmological history of the Universe [71,72], including entropy injection [12,73,74] or non-standard inflation scenarios [75][76][77][78][79][80].…”

Section: Introductionmentioning

confidence: 99%

Axion dark matter from frictional misalignment

Papageorgiou¹,

Quílez²,

Schmitz³

2022

Preprint

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We study the impact of sphaleron-induced thermal friction on the axion dark-matter abundance due to the interaction of an axion-like particle (ALP) with a dark non-abelian gauge sector in a secluded thermal bath. Thermal friction can either enhance the axion relic density by delaying the onset of oscillations or suppress it by damping them. We derive an analytical formula for the frictional adiabatic invariant, which remains constant along the axion evolution and which allows us to compute the axion relic density in a general set-up. Even in the most minimal scenario, in which a single gauge group is responsible for both the generation of the ALP mass and the friction force, we find that the resulting dark-matter abundance from the misalignment mechanism deviates from the standard scenario for axion masses m a ≳ 100 eV. We also generalize our analysis to the case where the gauge field that induces friction and the gauge sector responsible for the ALP mass are distinct and their couplings to the axion have a large hierarchy as can be justified by means of alignment or clockwork scenarios. We find that it is easy to open up the ALP parameter space where the resulting axion abundance matches the observed dark-matter relic density both in the traditionally over-and underabundant regimes. This conclusion also holds for the QCD axion.

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Axiogenesis from $SU(2)_R$ phase transition

Cited by 3 publications

References 36 publications

Gravitational Wave and CMB Probes of Axion Kination

Gravitational Wave and CMB Probes of Axion Kination

R-Parity Violation Axiogenesis

Axion dark matter from frictional misalignment

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