Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

Appelquist, Thomas; Brower, Richard C.; Fleming, George; Kiskis, Joe; Lin, Meifeng; Neil, Ethan T.; Osborn, James C.; Rebbi, C.; Rinaldi, Enrico; Schaich, David; Schroeder, Chris; Syritsyn, Sergey; Voronov, Gennady; Vranas, P.; Weinberg, Evan; Witzel, Oliver

doi:10.1103/physrevd.90.114502

Cited by 77 publications

(95 citation statements)

References 65 publications

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“…This seems strange; if a data set is going to be infrared conformal, it will be most infrared conformal at the smallest fermion mass, subject to the caveat that finite volume effects are largest there. Appelquist et al (2014a) also have data at one gauge coupling, two large volumes, and several quark masses. They see separation between the pseudoscalar and vector masses and lack of parity doubling in the vector and axial vector channels, all increasing at their smallest fermion masses.…”

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confidence: 99%

Lattice tests of beyond standard model dynamics

2016

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Over the last few years lattice techniques have been used to investigate candidate theories of new physics beyond the Standard Model. This review gives a survey of results from these studies. Most of these investigations have been of systems of gauge fields and fermions that have slowly-running coupling constants. A major portion of the review is a critical discussion of work in this particular subfield, first describing the methods used, and then giving a compilation of results for specific models.

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Section: Fig 21mentioning

confidence: 99%

Lattice tests of beyond standard model dynamics

2016

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“…The lightest composite scalar, so-called walking dilaton, arises as the consequence of the spontaneous breaking of the (approximate) scale invariance, and simultaneously gets massive due to the explicit breaking induced by the scale anomaly [10] arising from the Miransky scaling above: β(α) = ∂α/∂ ln Λ UV ∼ − α c π (α/α c − 1) 3/2 . QCD with eight flavors has been confirmed by lattice simulations to be walking with the chiral broken phase [11,12,13]. In that case, it has been observed on lattices [14,15,16] that the walking dilaton formed by a flavor singlet bilinearFF can be as light as or less than the chiral symmetry breaking scale m F , in accordance with the expected particle identity as a pseudo Nambu-Goldstone (pNG) boson for the scale symmetry breaking.…”

Section: Introductionmentioning

confidence: 63%

A walking dilaton inflation

Ishida

Matsuzaki

2020

Physics Letters B

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We propose an inflationary scenario based on a many-flavor hidden QCD with eight flavors, which realizes the almost scale-invariant (walking) gauge dynamics. The theory predicts two types of composite (pseudo) Nambu-Goldstone bosons, the pions and the lightest scalar (dilaton) associated with the spontaneous chiral symmetry breaking and its simultaneous violation of the approximate scale invariance. The dilaton acts as an inflaton, where the inflaton potential is induced by the nonperturbative-scale anomaly linked with the underlying theory. The inflaton potential parameters are highly constrained by the walking nature, which are evaluated by straightforward nonperturbative analyses including lattice simulations. Due to the pseudo Nambu-Goldstone boson's natures and the intrinsic property for the chiral symmetry breaking in the walking gauge dynamics, the inflaton coupled to the pions naturally undergoes the small field inflation consistently with all the cosmological and astrophysical constraints presently placed by Planck 2018 data. When the theory is vector-likely coupled to the standard model in part in a way to realize a dynamical electroweak symmetry breaking, the reheating temperature is determined by the pion decays to electroweak gauge bosons. The proposed inflationary scenario would provide a dynamical origin for the small field inflation as well as the light pions as a smoking-gun to be probed by future experiments.

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“…Our future plans, beside completing the analyses presented here, include a careful comparison of the scalar spectrum and of the beta function with N f = 4, which is our template for QCD. Moreover, we want to expand our previous study 8 of the S parameter to investigate the electroweak constraints on this theory in the massless limit.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the scalar spectrum in SU (3) with eight degenerate flavors

Rinaldi

2017

Int. J. Mod. Phys. A

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The Lattice Strong Dynamics collaboration is investigating the properties of a SU(3) gauge theory with N f = 8 light fermions on the lattice. We measure the masses of the lightest pseudoscalar, scalar and vector states using simulations with the nHYP staggered-fermion action on large volumes and at small fermion masses, reaching Mρ/Mπ ≈ 2.2. The axial-vector meson and the nucleon are also studied for the same range of fermion masses. One of the interesting features of this theory is the dynamical presence of a light flavor-singlet scalar state with 0 ++ quantum numbers that is lighter than the vector resonance and has a mass consistent with the one of the pseudoscalar state for the whole fermion mass range explored. We comment on the existence of such state emerging from our lattice simulations and on the challenges of its analysis. Moreover we highlight the difficulties in pursuing simulations in the chiral regime of this theory using large volumes.

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Lattice simulations with eight flavors of domain wall fermions in SU(3) gauge theory

Cited by 77 publications

References 65 publications

Lattice tests of beyond standard model dynamics

Lattice tests of beyond standard model dynamics

A walking dilaton inflation

Investigation of the scalar spectrum in SU (3) with eight degenerate flavors

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