Dynamical axions and gravitational waves

Croon, Djuna; Houtz, R.; Sanz, Verónica

doi:10.1007/jhep07(2019)146

Cited by 51 publications

(37 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An analytic argument by Pisarski and Wilczek in 1983 [291] determines the confining phase transition to be first order for N F ≥ 3 light quark flavors at the time of confinement. 3 Hidden sector confinement has been studied recently in the context of dark quark nuggets [293], as well as solutions to the strong CP problem [294,295]. Models of confinement invariably predict states around the confinement scale, as well as lighter pions.…”

Section: Hidden Sector Confinementmentioning

confidence: 99%

Gravitational wave probes of dark matter: challenges and opportunities

Bertone

Croon²,

Amin

et al. 2020

SciPost Phys. Core

Self Cite

View full text Add to dashboard Cite

In this white paper, we discuss the prospects for characterizing and identifying dark matter using gravitational waves, covering a wide range of dark matter candidate types and signals. We argue that present and upcoming gravitational wave probes offer unprecedented opportunities for unraveling the nature of dark matter and we identify the most urgent challenges and open problems with the aim of encouraging a strong community effort at the interface between these two exciting fields of research.

show abstract

Section: Hidden Sector Confinementmentioning

confidence: 99%

Gravitational wave probes of dark matter: challenges and opportunities

Bertone

Croon²,

Amin

et al. 2020

SciPost Phys. Core

Self Cite

View full text Add to dashboard Cite

show abstract

“…where the dynamical scale of SU (3) 1 is defined by 16) and once again the instanton weight d 3 (M )| S=3,F =6 is given in (3.11). Note that these results are in agreement with the qualitative discussion of Sec.…”

Section: Small Instanton Contributionsmentioning

confidence: 99%

“…This possibility opens up new regions of the parameter space on the m 2 a , f a plane. Interesting models implementing the mechanism of [12] were proposed in [14][15][16][17][18], applications to models of inflation were studied in [19]. Other approaches to modify the axion mass within QCD were proposed in [20][21][22][23] while in [24][25][26][27][28][29][30] the axion mass is raised by coupling it to a new confining gauge group.…”

Section: Introductionmentioning

confidence: 99%

UV sensitivity of the axion mass from instantons in partially broken gauge groups

Csáki

Ruhdorfer

Shirman

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

We examine the contribution of small instantons to the axion mass in various UV completions of QCD. We show that the reason behind the potential dominance of such contributions is the non-trivial embedding of QCD into the UV theory. The effects from instantons in the partially broken gauge group appear as "fractional instanton" corrections in the effective theory. These will exhibit unusual dependences on the various scales in the problem whenever the index of embedding is non-trivial. We present a full one-instanton calculation of the axion mass in the simplest product group models, carefully keeping track of numerical prefactors. Rather than using a 't Hooft operator approximation we directly evaluate the contributions to the vacuum bubble, automatically capturing the effects of closing up external fermion lines with Higgs loops. This approach is manifestly finite and removes the uncertainty associated with introducing a cutoff scale for the Higgs loops. We verify that the small instantons may dominate over the QCD contribution for very high breaking scales and at least three group factors.

show abstract

“…In the absence of a reliable effective field theory description of chiral symmetry breaking at the scales of interest, the gravitational wave spectra can be studied using the linear-sigma model as a low-energy effective theory, with finite-temperature corrections from meson loops [36][37][38] or using interpolating models such as the Nambu-Jona-Lasinio model [38]. However, such models are known to fall short for the case of QCD, and the resulting GW spectrum is subject to very large uncertainties.…”

Section: Gravitational Wavesmentioning

confidence: 99%

QCD baryogenesis

Croon¹,

Howard

Ipek

et al. 2020

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

We explore a simple model which naturally explains the observed baryon asymmetry of the Universe. In this model the strong coupling is promoted to a dynamical quantity, which evolves through the vacuum expectation value of a singlet scalar field that mixes with the Higgs field. In the resulting cosmic history, QCD confinement and electroweak symmetry breaking initially occur simultaneously close to the weak scale. The early confinement triggers a chemical potential between baryons and antibaryons through the interactions of the η 0 meson, resulting in spontaneous baryogenesis. The electroweak sphalerons are sharply switched off after confinement and the baryon asymmetry is frozen in. Subsequently, evolution of the Higgs vacuum expectation value (which is modified in the confined phase) triggers a relaxation to a Standard Model-like vacuum. We identify viable regions of parameter space and describe various experimental probes, including current and future collider constraints and gravitational wave phenomenology.

show abstract

Dynamical axions and gravitational waves

Cited by 51 publications

References 76 publications

Gravitational wave probes of dark matter: challenges and opportunities

Gravitational wave probes of dark matter: challenges and opportunities

UV sensitivity of the axion mass from instantons in partially broken gauge groups

QCD baryogenesis

Contact Info

Product

Resources

About