Chiral-scale effective theory including a dilatonic meson

Li, Yanling; Ma, Yong-Liang; Rho, Mannque

doi:10.1103/physrevd.95.114011

Cited by 41 publications

(92 citation statements)

References 45 publications

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“…where V = (ρ, ω), holds in RI. To the leading order in the counting involved with both scale and chiral symmetries [41], the hidden gauge coupling g V and the dilatonnucleon coupling g σN do not scale in RI. It should be stressed that this expression (18) uses approximate equality.…”

Section: Bshls Lagrangianmentioning

confidence: 99%

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Pseudoconformal structure in dense baryonic matter

Rho

2019

Phys. Rev. D

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We clarify and extend further the idea we developed before that baryonic matter at high density has an emergent "pseudoconformal symmetry." It is argued that as baryonic density exceeds n ≃ n 1/2 > ∼ 2n0, a topology change mimicking the baryon-quark continuity takes place at n 1/2 . In terms of skyrmions, this corresponds to the transition from skyrmions to half-skyrmions and impacts on the equation of state of dense baryonic matter. The emergence in medium at n 1/2 of paritydoublet symmetry -which is invisible in QCD in a matter-free vacuum -plays the crucial role. The consequence of the topology change is that massive compact stars carry the "pseudoconformal sound velocity" v 2 s /c 2 ≈ 1/3 at n ∼ > n 1/2 signaling a precursor to the precocious emergence of scale symmetry as well as a local symmetry hidden in QCD in the matter-free vacuum. A highly significant prediction of this work is that the topology change density from normal matter to halfskyrmion matter, up to date inaccessible either by QCD proper or by terrestrial experiments, could possibly be pinned down within the range 2 < n 1/2 /n0 < 4, commensurate with the range expected for a continuous hadrons-to-quarks or -gluons transition.I.

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Section: Bshls Lagrangianmentioning

confidence: 99%

“…it is straightforward to derive from (41) and (42) the vacuum expectation value (VEV) of the TEMT θ µ µ (we work in the chiral limit)…”

Section: Pseudoconformal Equation Of Statementioning

confidence: 99%

Pseudoconformal structure in dense baryonic matter

Rho

2019

Phys. Rev. D

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“…It is interesting to note that at the leading order of the BChPT, the scalaron effects on the nucleon mass by coincidence looks just like the Brown-Rho (BR) scaling [43], or the leading-order scale symmetry relation [44,45] as a sort of the extension of the BR scaling.…”

Section: Coupling Scalaron To Baryon Chiral Perturbation Theory At Lementioning

confidence: 99%

Big Bang Nucleosynthesis hunts chameleon dark matter

Chen

Katsuragawa

Matsuzaki

et al. 2020

J. High Energ. Phys.

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We study the chameleon field dark matter, dubbed scalaron, in F (R) gravity in the Big Bang Nucleosynthesis (BBN) epoch. With an R 2 -correction term required to solve the singularity problem for F (R) gravity, we first find that the scalaron dynamics is governed by the R 2 term and the chameleon mechanism in the early universe, which makes the scalaron physics model-independent regarding the low-energy scale modification. In viable F (R) dark energy models including the R 2 correction, our analysis suggests the scalaron universally evolves in a way with a bouncing oscillation irrespective of the low-energy modification for the late-time cosmic acceleration. Consequently, we find a universal bound on the scalaron mass in the BBN epoch, to be reflected on the constraint for the coupling strength of the R 2 term, which turns out to be more stringent than the one coming from the fifth force experiments. It is then shown that the scalaron naturally develops a small enough fluctuation in the BBN epoch, hence can avoid the current BBN constraint placed by the latest Planck 2018 data, and can also have a large enough sensitivity to be hunted by the BBN, with more accurate measurements for light element abundances as well as the baryon number density fraction.

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“…Leading-order scale symmetry As we discussed above, it is essential to remove the strong constraint of the classical scale invariance to give a mass to the dilaton, and also to include a nonperturbative gluonic effect from the underlying dynamics. One possible access to achieve them is to introduce a small explicit breaking term characterized by a breaking parameter a arising from the scale anomaly, which is conventionally known as the leading order scale symmetry (LOSS) in the fermionic QCD [7]:…”

Section: A Scale-invariant Linear Sigma Modelmentioning

confidence: 99%

Enhanced di-Higgs signal from hidden scalar QCD at leading-order in the scale-symmetry limit

Ouyang

Matsuzaki

2019

Phys. Rev. D

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We develop an effective-model description arising from a recently proposed scale-invariant hidden scalar-QCD, which has been used to explain the dynamical origin of the electroweak scale. In addition to the previous works, our new effective model includes the dynamical scale-anomaly effect from the hidden QCD gluons, to explicitly break the classical-scale invariance at the level of an effective field theory, which is known as the leading-order scale-symmetry (LOSS). In the phenomenological analysis, the proposed model predicts a light composite dilaton composed of hidden scalar quarks and gluons with the mass around electroweak scale (around 280 GeV), and has only one input parameter, which is the mixing angle between the Higgs boson and the composite dilaton. Our result for the dilaton mass is in accord with the lattice simulation for scalar QCD, where the scalar-quark bound states acquire a large effective mass from the hidden gluon contribution. Furthermore, we predict several significant deviations from the SM, like the diHiggs production cross sections (maximally about 10 times larger than the SM prediction), that could be directly tested at the high luminosity LHC. It is also the first study for the diHiggs production signal predicted from a scale(conformal)-invariant hidden sector, even from dark/hidden QCD. Our proposed effective model is thus significantly different than the conventional realization of scale-invariant hidden-scalar QCD without the scale anomaly effect, and can potentially provide a competitive explanation for many exotic phenomena beyond the standard model, such as new dark matter candidates and a strongly first-order electroweak phase transition. PACS numbers:#1 Strictly speaking, the classical-scale invariance may not be a solution to the gauge hierarchy problem. This kind of scenario

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Chiral-scale effective theory including a dilatonic meson

Cited by 41 publications

References 45 publications

Pseudoconformal structure in dense baryonic matter

Pseudoconformal structure in dense baryonic matter

Big Bang Nucleosynthesis hunts chameleon dark matter

Enhanced di-Higgs signal from hidden scalar QCD at leading-order in the scale-symmetry limit

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