Peccei-Quinn symmetry from dynamical supersymmetry breaking

In a Mirror Twin World with a maximally symmetric Higgs sector the little hierarchy of the Standard Model can be significantly mitigated, perhaps displacing the cutoff scale above the LHC reach. We show that consistency with observations requires that the Z 2 parity exchanging the Standard Model with its mirror be broken in the Yukawa couplings. A minimal such effective field theory, with this sole Z 2 breaking, can generate the Z 2 breaking in the Higgs sector necessary for the Twin Higgs mechanism. The theory has constrained and correlated signals in Higgs decays, direct Dark Matter Detection and Dark Radiation, all within reach of foreseen experiments, over a region of parameter space where the fine-tuning for the electroweak scale is 10-50%. For dark matter, both mirror neutrons and a variety of self-interacting mirror atoms are considered. Neutrino mass signals and the effects of a possible additional Z 2 breaking from the vacuum expectation values of B − L breaking fields are also discussed.

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“…75. With these masses, we solve the two-loop renormalization group equation of the mirror QCD gauge coupling constant.…”

Section: Mirror Qcd Phase Transition Temperaturementioning

confidence: 99%

“…Due to the small Peccei-Quinn symmetry breaking scale and the large axion mass, the PecceiQuinn symmetry can be easily understood as an accidental symmetry [65,68]. (See [69][70][71][72][73][74][75] for models of an invisible QCD axion with an accidental Peccei-Quinn symmetry. )…”

Section: A Heavy Axion and Z 2 Symmetry Breaking In Froggatt Nielsen mentioning

confidence: 99%

Minimal mirror twin Higgs

Barbieri

Hall

Harigaya

2016

J. High Energ. Phys.

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135

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“…Such a situation can occur in a variety of BSM scenarios. Possible BSM scalar fields that φ may be identified as include, but are not limited to: the Polonyi field in models of gravity-mediated supersymmetry breaking [41,42], a modulus field in four-dimensional compactifications of string theory [43][44][45][46], a flavon field in extensions of the Standard Model (SM) that aim at explaining the flavor structure of quark and leptons (such as, e.g., the Froggatt-Nielsen flavor model [47]), and the saxion field in supersymmetric axion models [48][49][50][51][52][53][54].…”

mentioning

confidence: 99%

Imprint of a scalar era on the primordial spectrum of gravitational waves

DʼEramo

Schmitz

2019

Phys. Rev. Research

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Upcoming searches for the stochastic background of inflationary gravitational waves (GWs) offer the exciting possibility to probe the evolution of our Universe prior to Big Bang nucleosynthesis. In this spirit, we explore the sensitivity of future GW observations to a broad class of beyond-the-Standard-Model scenarios that lead to a nonstandard expansion history. We consider a new scalar field whose coherent oscillations dominate the energy density of the Universe at very early times, resulting in a scalar era prior to the standard radiation-dominated era. The imprint of this scalar era on the primordial GW spectrum provides a means to probe well-motivated yet elusive models of particle physics. Our work highlights the complementarity of future GW observatories across the entire range of accessible frequencies.

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“…The F -term of S stabilizes P andP in the moduli space PP = f 2 a to break PQ. The coupling constant λ may be as large as 4π in strongly coupled models [80,81]. To ensure that PQ is not thermally restored after inflation where the maximum temperature achieved during reheating is T max (H I M Pl T 2 R ) 1/4 , 5 the thermal mass must be less than λf a < 4πf a at this time, giving an upper bound on the Yukawa coupling which can be easily satisfied with y O(1) in the allowed parameter space of Fig.…”

Section: Minimal Modelsmentioning

confidence: 99%