“Invisible” QCD axion rolling through the QCD phase transition

Kim, Jihn E.; Kim, Se-Jin

doi:10.1016/j.physletb.2018.07.020

Cited by 12 publications

(12 citation statements)

References 66 publications

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“…[120], but adopt a cosmological model, taking into a field theoretic account of 'supercooling' of the light degrees by forming bubbles in the RD universe as shown in Fig. 9, presented recently [121]. We adopt two basic principles: (i) during the first order phase transition the Gibbs free energy is conserved and (ii) the phase transition is completed into the homogenious h-phase by the time t f in the evolving Universe.…”

Section: Qcd Phase Transition In the Rd Universe And Axion Massmentioning

confidence: 99%

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Fate of global symmetries in the Universe: QCD axion, quintessential axion and trans-Planckian inflaton decay constant

Kim

Nam

Semetzidis

2018

Int. J. Mod. Phys. A

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Pseudoscalars appearing in particle physics are reviewd systematically. From the fundamental point of view at an ultra-violat completed theory, they can be light if they are realized as pseudo-Goldstone bosons of some spontaneously broken global symmetries. The spontaneous breaking scale is parametrized by the decay constant f . The global symmetry is defined by the lowest order terms allowed in the effective theory consistent with the gauge symmetry in question. Since any global symmetry is known to be broken at least by quantum gravitational effects, all pseudoscalars should be massive. The mass scale is determined by f and the explicit breaking terms ∆V in the effective potential and also anomaly terms ∆Λ 4 G for some non-Abelian gauge groups G. The well-known example by non-Abelian gauge group breaking is the potential for the "invisible" QCD axion, via the Peccei-Quinn symmetry, which constitutes a major part of this review. Even if there is no breaking terms from gauge anomalies, there can be explicit breaking terms ∆V in the potential in which case the leading term suppressed by f determines the pseudoscalar mass scale. If the breaking term is extremely small and the decay constant is trans-Planckian, the corresponding pseudoscalar can be a candidate for a 'quintessential axion'. In general, (∆V ) 1/4 is considered to be smaller than f , and hence the pseudo-Goldstone boson mass scales are considered to be smaller than the decay constants. In such a case, the potential of the pseudo-Goldstone boson at the grand unification scale is sufficiently flat near the top of the potential that it can be a good candidate for an inflationary model, which is known as 'natural inflation'. We review all these ideas in the bosonic collective motion framework.

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Section: Qcd Phase Transition In the Rd Universe And Axion Massmentioning

confidence: 99%

“…A view of susceptibility χ (blue curve) during the quark-hadron phase transition, and a typical axion energy density (red curve) for ma = 100 µ eV[121].…”

mentioning

confidence: 99%

Fate of global symmetries in the Universe: QCD axion, quintessential axion and trans-Planckian inflaton decay constant

Kim

Nam

Semetzidis

2018

Int. J. Mod. Phys. A

Self Cite

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“…Moreover, we may consider the environment of the early universe, where the hadron phase is expected to be created in a spatially (presumably almost) homogeneous form, after the QCD phase transition and thermalization of the hadron phase bubbles (even with feasible inhomogeneity by a supercooling) [24]. The homogeneous hadron phase is thermalized with the temperature ∼ 100 MeV [24][25][26], at which all hadrons already become nonrelativistic in the thermal bath with photon (but still strongly interacting each other in the kinetic equilibrium). Then the thermal loop corrections to the dilaton dynamics can safely be neglected (with all exponentially suppressed), so the external EM interactions would be most relevant to the dilaton, as well as the vacuum contributions by strong interactions with pions and dilatons themselves.…”

mentioning

confidence: 99%

Dynamic scale anomalous transport in QCD with electromagnetic background

Kawaguchi,

Matsuzaki,

Huang

2020

Preprint

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We discuss phenomenological implications of the anomalous transport induced by the scale anomaly in QCD coupled to an electromagnatic (EM) field, based on a dilaton effective theory. The scale anomalous current emerges in a way perfectly analogous to the conformal transport current induced in a curved spacetime background, or the Nernst current in Dirac and Weyl semimetals -both current forms are equivalent by a "Weyl transformation". We focus on a spatially homogeneous system of QCD hadron phase, which is expected to be created after the QCD phase transition and thermalization. We find that the EM field can induce a dynamic oscillatory dilaton field which in turn induces the scale anomalous current. As the phenomenological applications, we evaluate the dilepton and diphoton productions induced from the dynamic scale anomalous current, and find that those productions include a characteristic peak structure related to the dynamic oscillatory dialton, which could be tested in heavy ion collisions. We also briefly discuss the out-of-equilibrium particle production created by a nonadiabatic dilaton oscillation, which happens in a way of the so-called tachyonic preheating mechanism.

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“…Moreover, we may consider the environment of the early universe, where the hadron phase is expected to be created in a spatially (presumably almost) homogeneous form, after the QCD phase transition and thermalization of the hadron phase bubbles (even with feasible inhomogeneity by a supercooling) [25]. The homogeneous hadron phase is thermalized with the temperature ∼ 100 MeV [25][26][27], at which all hadrons already become nonrelativistic in the thermal bath with photon (but still strongly interacting each other in the kinetic equilibrium). Then the thermal loop corrections to the dilaton dynamics can safely be neglected (with all exponentially suppressed), so the external EM interactions would be most relevant to the dilaton, as well as the vacuum contributions by strong interactions with pions and dilatons themselves.…”

Section: Jhep10(2020)017mentioning

confidence: 99%

Dynamic scale anomalous transport in QCD with electromagnetic background

Kawaguchi

Matsuzaki

Huang

2020

J. High Energ. Phys.

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We discuss phenomenological implications of the anomalous transport induced by the scale anomaly in QCD coupled to an electromagnetic (EM) field, based on a dilaton effective theory. The scale anomalous current emerges in a way perfectly analogous to the conformal transport current induced in a curved spacetime background, or the Nernst current in Dirac and Weyl semimetals — both current forms are equivalent by a “Weyl transformation”. We focus on a spatially homogeneous system of QCD hadron phase, which is expected to be created after the QCD phase transition and thermalization. We find that the EM field can induce a dynamic oscillatory dilaton field which in turn induces the scale anomalous current. As the phenomenological applications, we evaluate the dilepton and diphoton productions induced from the dynamic scale anomalous current, and find that those productions include a characteristic peak structure related to the dynamic oscillatory dilaton, which could be tested in heavy ion collisions. We also briefly discuss the out-of-equilibrium particle production created by a nonadiabatic dilaton oscillation, which happens in a way of the so-called tachyonic preheating mechanism.

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“Invisible” QCD axion rolling through the QCD phase transition

Cited by 12 publications

References 66 publications

Fate of global symmetries in the Universe: QCD axion, quintessential axion and trans-Planckian inflaton decay constant

Fate of global symmetries in the Universe: QCD axion, quintessential axion and trans-Planckian inflaton decay constant

Dynamic scale anomalous transport in QCD with electromagnetic background

Dynamic scale anomalous transport in QCD with electromagnetic background

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