Pati-Salam axion

Luzio, Luca Di

doi:10.1007/jhep07(2020)071

Cited by 8 publications

(5 citation statements)

References 128 publications

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“…For instance, the models discussed in Refs. [70,71] feature a PQ breaking representation that transforms trivially under the Z 4 center of SU(4) PS , and hence the U(1) PQ is not protected. Following a similar path as in the present work, an accidental Pati-Salam axion could arise by breaking the PQ symmetry with representations that have non-trivial B − L quantum numbers (e.g.…”

Section: Discussionmentioning

confidence: 99%

Accidental SO(10) axion from gauged flavour

Di Luzio

2020

Preprint

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An accidental U(1) Peccei-Quinn (PQ) symmetry automatically arises in a class of SO(10) unified theories upon gauging the SU(3) f flavour group. The PQ symmetry is protected by the Z 4 × Z 3 center of SO(10) × SU(3) f up to effective operators of canonical dimension nine (developing high-scale contributions to the axion potential). In the pre-inflationary PQ breaking scenario the axion mass window is predicted to be m a ∈ [7 × 10 −8 , 10 −3 ] eV, where the lower end is bounded by the seesaw scale and the upper end by iso-curvature fluctuations. A high-quality axion, that is immune to the PQ quality problem, is obtained for m a 0.02 eV. We finally offer a general perspective on the PQ quality problem in 4D grand unified theories. Contents 1 Introduction 2 Gauging the way to the SO(10) axion 3 Peccei-Quinn quality 4 Axion's guts (physical axion field) 5 SU(3) f sector 6 Axion phenomenology 7 Conclusions A Low-energy axion couplings

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Section: Discussionmentioning

confidence: 99%

Accidental SO(10) axion from gauged flavour

Di Luzio

2020

Preprint

Self Cite

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“…1. In contrast to grand unified theories (GUT), partially unified theories such as the Pati-Salam extensions of the SM allows for a more flexible symmetry breaking scale, ranging from just below the Planck scale, to as low as O(10 TeV) depending on the field content [91][92][93][94][95].…”

Section: Particle Physics Scenariosmentioning

confidence: 99%

Gravitational capture of magnetic monopoles by primordial black holes in the early universe

Zhang,

Zhang

2023

J. High Energ. Phys.

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It is intriguing to ask whether the existence of primordial black holes (PBHs) in the early universe could significantly reduce the abundance of certain stable massive particles (SMP) via gravitational capture, after which the PBHs evaporate before BBN to avoid conflict with stringent bounds. For example, this mechanism is relevant to an alternative solution of the monopole problem proposed by Stojkovic and Freese, in which magnetic monopoles produced in the early universe are captured by PBHs, thus freeing inflation from having to occur during or after the corresponding phase transitions that produced the monopoles. In this work, we reanalyze the solution by modelling the capture process in the same way as the coexisting monopole annihilation. A subtle issue which is not handled properly in the previous literature is the choice of an effective capture cross section for diffusive capture. We model this aspect properly and justify our treatment. A monochromatic PBH mass function and a radiation-dominated era before PBH evaporation are assumed. We find that for Pati-Salam monopoles corresponding to a symmetry breaking scale between 1010 GeV and 1015 GeV, the capture rate is many orders of magnitude below what is needed to cause a significant reduction of the monopole density. Within our assumptions, we also find that the magnetic charge that is large enough to make an extremal magnetic black hole cosmologically stable cannot be obtained from magnetic charge fluctuation via monopole capture. The large magnetic charged required by cosmological stability can nevertheless be obtained from magnetic charge fluctuation at PBH formation, and if later the monopole abundance can be reduced significantly by some non-inflationary mechanism, long-lived near-extremal magnetic black holes of observational relevance might result.

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Section: Particle Physics Scenariosmentioning

confidence: 99%

Gravitational capture of magnetic monopoles by primordial black holes in the early universe

Zhang¹,

Zhang²

2023

Preprint

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It is intriguing to ask whether the existence of primordial black holes (PBHs) in the early universe could significantly reduce the abundance of certain stable massive particles (SMP) via gravitational capture, after which the PBHs evaporate before BBN to avoid conflict with stringent bounds. For example, this mechanism is relevant to an alternative solution of the monopole problem proposed by Stojkovic and Freese, in which magnetic monopoles produced in the early universe are captured by PBHs, thus freeing inflation from having to occur during or after the corresponding phase transitions that produced the monopoles. In this work, we reanalyze the solution by modelling the capture process in the same way as the coexisting monopole annihilation, which exhibits typical features of a diffusive capture. A monochromatic PBH mass function and a radiationdominated era before PBH evaporation are assumed. We found that for Pati-Salam monopoles corresponding to a symmetry breaking scale between 10 10 GeV and 10 15 GeV, the capture rate is many orders of magnitude below what is needed to cause a significant reduction of the monopole density. The difference with respect to previous literature can be attributed to both the modelling of the capture process and also the assumption on the PBH mass function. Within our assumptions, we also found that the magnetic charge that is large enough to make an extremal magnetic black hole cosmologically stable cannot be obtained from magnetic charge fluctuation via monopole capture. The large magnetic charged required by cosmological stability can nevertheless be obtained from magnetic charge fluctuation at PBH formation, and if later the monopole abundance can be reduced significantly by some non-inflationary mechanism, long-lived near-extremal magnetic black holes of observational relevance might result.

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Pati-Salam axion

Cited by 8 publications

References 128 publications

Accidental SO(10) axion from gauged flavour

Accidental SO(10) axion from gauged flavour

Gravitational capture of magnetic monopoles by primordial black holes in the early universe

Gravitational capture of magnetic monopoles by primordial black holes in the early universe

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