Phase transitions in perturbative walking dynamics

Azatov, Aleksandr; Vanvlasselaer, Miguel

doi:10.1007/jhep09(2020)085

Cited by 22 publications

(13 citation statements)

References 53 publications

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“…the dilaton [24]). That supercooling occurs with a light dilaton is known from a JHEP04(2021)278 number of previous studies [16][17][18], see [25][26][27][28][29][30][31][32][33] for studies in a confining sector and [34][35][36][37][38][39][40][41][42][43] for studies of holographic dual 5D warped extra dimension models.…”

Section: Strongly Coupled Cftmentioning

confidence: 97%

String fragmentation in supercooled confinement and implications for dark matter

Baldes

Gouttenoire

Sala

2021

J. High Energ. Phys.

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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. We suggest a modelling of the subsequent dynamics and find that the flux linking the fundamental quanta 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 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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Section: Strongly Coupled Cftmentioning

confidence: 97%

String fragmentation in supercooled confinement and implications for dark matter

Baldes

Gouttenoire

Sala

2021

J. High Energ. Phys.

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“…(3.17) between m χ and the reheating temperature is easily achievable in the case of long and flat potentials where the difference of energies between false and true vacua is smaller than the VEV: T reh ∼ (∆V /g * ) 1/4 O(10 −1 ) φ ∼ O(10 −1 )m χ , which can be achieved for example by simply taking small quartic coupling in the φ potential. This happens typically in models with approximate conformal symmetry [43][44][45][46], and in the case of models containing heavy fermions [47,48].…”

Section: Jhep10(2021)043mentioning

confidence: 99%

Baryogenesis via relativistic bubble walls

Azatov

Vanvlasselaer

Yin

2021

J. High Energ. Phys.

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We present a novel mechanism which leads to the baryon asymmetry generation during the strong first order phase transition. If the bubble wall propagates with ultra-relativistic velocity, it has been shown [1] that it can produce states much heavier than the scale of the transition and that those states are then out of equilibrium. In this paper, we show that this production mechanism can also induce CP-violation at one-loop level. We calculate those CP violating effects during the heavy particle production and show, that combined with baryon number violating interactions, those can lead to successful baryogenesis. Two models based on this mechanism are constructed and their phenomenology is discussed. Stochastic gravitational wave signals turn out to be generic signatures of this type of models.

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“…There are two types of well-understood quasi-conformal models, whose scalar potential takes the form λ(φ)φ 4 /4 with slowly evolving λ(φ). The first type describes a confinementdeconfinement transition in (nearly conformal) strongly coupled gauge theories, and it has been modelled mainly using AdS/CFT methods [15] (see also [7,9,11,[16][17][18][19][20][21][22][23][24][25][26][27]). The second class of models consists in the radiative symmetry breaking in a weakly coupled gauge theory à la Coleman-Weinberg [28] (see also [8,10,[29][30][31][32][33][34][35][36]).…”

Section: Thermal Inflation From Quasi-conformal Dynamicsmentioning

confidence: 99%

Escape from supercooling with or without bubbles: gravitational wave signatures

2021

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Quasi-conformal models are an appealing scenario that can offer naturally a strongly supercooled phase transition and a period of thermal inflation in the early Universe. A crucial aspect for the viability of these models is how the Universe escapes from the supercooled state. One possibility is that thermal inflation phase ends by nucleation and percolation of true vacuum bubbles. This route is not, however, always efficient. In such case another escape mechanism, based on the growth of quantum fluctuations of the scalar field that eventually destabilize the false vacuum, becomes relevant. We study both of these cases in detail in a simple yet representative model. We determine the duration of the thermal inflation, the curvature power spectrum generated for the scales that exit horizon during the thermal inflation, and the stochastic gravitational wave background from the phase transition. We show that these gravitational waves provide an observable signal from the thermal inflation in almost the entire parameter space of interest. Furthermore, the shape of the gravitational wave spectrum can be used to ascertain how the Universe escaped from supercooling.

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Phase transitions in perturbative walking dynamics

Cited by 22 publications

References 53 publications

String fragmentation in supercooled confinement and implications for dark matter

String fragmentation in supercooled confinement and implications for dark matter

Baryogenesis via relativistic bubble walls

Escape from supercooling with or without bubbles: gravitational wave signatures

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