Peccei-Quinn phase transition at LIGO

Harling, Benedict von; Pomarol, Alex; Pujolàs, Oriol; Rompineve, Fabrizio

doi:10.1007/jhep04(2020)195

Cited by 80 publications

(61 citation statements)

References 76 publications

(129 reference statements)

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“…Like for other models with CW symmetry breaking [11,12], we find that when T goes below T c the scalar field φ is trapped in the false vacuum φ = 0 until T is much below T c , in other words the universe features a phase of strong supercooling. Then the energy density is dominated by the vacuum energy of φ and the universe grows exponentially like during inflation but with Hubble rate H I = β f 2 a /(4 √ 3M P ), whereM P is the reduced Planck mass that is defined in terms of the Planck mass M P byM P ≡ M P / √ 8π.…”

Section: Jhep12(2020)049 4 Peccei-quinn Phase Transitionsupporting

confidence: 71%

“…But, as pointed out in refs. [11,12], the particular features of the phase transition and the corresponding GWs depend on the specific dynamics implementing the PQ symmetry. 1 These features include, for example, the temperature at which the phase transition occurs, its duration and the GW spectrum.…”

Section: Jhep12(2020)049mentioning

confidence: 99%

“…As pointed out in ref. [31] (see [11,12] for recent applications to QCD axion models) the phase transitions associated with the CW symmetry breaking are typically of first order and can, therefore, lead to observable GWs. 2 This, together with the high predictivity of the TAF axion model mentioned above, can lead to testable implications at GW detectors.…”

Section: Jhep12(2020)049mentioning

confidence: 99%

“…2 This, together with the high predictivity of the TAF axion model mentioned above, can lead to testable implications at GW detectors. Furthermore, a typical feature of CW phase transitions is the presence of a phase of strong supercooling, meaning that the temperature below which the phase transition is effective (the nucleation JHEP12(2020)049 temperature) turns out to be much smaller than the critical temperature [31] and, for the PQ symmetry breaking, much below f a [11,12].…”

Section: Jhep12(2020)049mentioning

confidence: 99%

“…Finally, another important parameter is the inverse of the duration of the phase transition which, following ref. [12], we define through…”

Section: Jhep12(2020)049mentioning

confidence: 99%

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Gravitational waves from fundamental axion dynamics

Ghoshal

Salvio

2020

J. High Energ. Phys.

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A totally asymptotically free QCD axion model, where all couplings flow to zero in the infinite energy limit, was recently formulated. A very interesting feature of this fundamental theory is the ability to predict some low-energy observables, like the masses of the extra fermions and scalars. Here we find and investigate a region of the parameter space where the Peccei-Quinn (PQ) symmetry is broken quantum mechanically through the Coleman-Weinberg mechanism. This results in an even more predictive framework: the axion sector features only two independent parameters (the PQ symmetry breaking scale and the QCD gauge coupling). In particular, we show that the PQ phase transition is strongly first order and can produce gravitational waves within the reach of future detectors. The predictivity of the model leads to a rigid dependence of the phase transition (like its duration and the nucleation temperature) and the gravitational wave spectrum on the PQ symmetry breaking scale and the QCD gauge coupling.

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Section: Jhep12(2020)049 4 Peccei-quinn Phase Transitionsupporting

confidence: 71%

Section: Jhep12(2020)049mentioning

confidence: 99%

Section: Jhep12(2020)049mentioning

confidence: 99%

Section: Jhep12(2020)049mentioning

confidence: 99%

“…Finally, another important parameter is the inverse of the duration of the phase transition which, following ref. [12], we define through…”

Section: Jhep12(2020)049mentioning

confidence: 99%

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Gravitational waves from fundamental axion dynamics

Ghoshal

Salvio

2020

J. High Energ. Phys.

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String Fragmentation in Supercooled Confinement and Implications for Dark Matter

Gouttenoire

2022

Beyond the Standard Model Cocktail

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A strongly-coupled sector can feature a supercooled confinement transition in the early universe. We point out that, when fundamental quanta of the strong sector are swept into expanding bubbles of the confined phase, the distance between them is large compared to the confinement scale. The flux linking the fundamental quanta then deforms and stretches towards the wall, producing an enhanced number of composite states upon string fragmentation. The composite states are highly boosted in the plasma frame, which leads to additional particle production through the subsequent deep inelastic scattering. We propose a modelling of these dynamics and study the consequences for the abundance and energetics of particles in the universe and for bubble-wall Lorentz factors. This opens several new avenues of investigation, which we begin to explore here, showing that the composite dark matter relic density is affected by many orders of magnitude.

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New sensitivity curves for gravitational-wave signals from cosmological phase transitions

Schmitz

2021

J. High Energ. Phys.

211

149

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Gravitational waves (GWs) from strong first-order phase transitions (SFOPTs) in the early Universe are a prime target for upcoming GW experiments. In this paper, I construct novel peak-integrated sensitivity curves (PISCs) for these experiments, which faithfully represent their projected sensitivities to the GW signal from a cosmological SFOPT by explicitly taking into account the expected shape of the signal. Designed to be a handy tool for phenomenologists and model builders, PISCs allow for a quick and systematic comparison of theoretical predictions with experimental sensitivities, as I illustrate by a large range of examples. PISCs also offer several advantages over the conventional power-law-integrated sensitivity curves (PLISCs); in particular, they directly encode information on the expected signal-to-noise ratio for the GW signal from a SFOPT. I provide semianalytical fit functions for the exact numerical PISCs of LISA, DECIGO, and BBO. In an appendix, I moreover present a detailed review of the strain noise power spectra of a large number of GW experiments. The numerical results for all PISCs, PLISCs, and strain noise power spectra presented in this paper can be downloaded from the Zenodo online repository [1]. In a companion paper [2], the concept of PISCs is used to perform an in-depth study of the GW signal from the cosmological phase transition in the real-scalar-singlet extension of the standard model. The PISCs presented in this paper will need to be updated whenever new theoretical results on the expected shape of the signal become available. The PISC approach is therefore suited to be used as a bookkeeping tool to keep track of the theoretical progress in the field.

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Peccei-Quinn phase transition at LIGO

Cited by 80 publications

References 76 publications

Gravitational waves from fundamental axion dynamics

Gravitational waves from fundamental axion dynamics

String Fragmentation in Supercooled Confinement and Implications for Dark Matter

New sensitivity curves for gravitational-wave signals from cosmological phase transitions

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