Friction pressure on relativistic bubble walls

Gouttenoire, Yann; Jinno, Ryusuke; Sala, Filippo

doi:10.48550/arxiv.2112.07686

Cited by 9 publications

(18 citation statements)

References 80 publications

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“…Due to spherical symmetry, we are able to evolve the equations of motion of Eqs. (13)(14)(15) on a 1D lattice. To do this, we use a simplified 1D version of the SCOTTS code used in Refs.…”

Section: Methodsmentioning

confidence: 99%

“…With upcoming gravitational wave detectors like LISA offering enhanced observational prospects for cosmological gravitational wave backgrounds, there have been increased efforts to understand first-order phase transitions in precise detail. Recent years have seen advances in the determination of the asymptotic wall speed for expanding bubbles [8][9][10][11][12][13][14][15][16], more precise calculations of the thermodynamic phase transition parameters and nucleation rates [17][18][19][20][21][22][23][24][25][26], and refined baryogenesis computations [27][28][29][30][31]. Holographic techniques have been used to compute phase transition parameters and gravitational wave signals [12,16,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Droplet collapse during strongly supercooled transitions

Cutting¹,

Essi²,

Weir³

2022

Preprint

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We simulate the decay of isolated, spherically symmetric droplets in a cosmological phase transition. It has long been posited that such heated droplets of the metastable state could form, and they have recently been observed in 3D multi-bubble simulations. In those simulations, the droplets were associated with a reduction in the wall velocity and a decrease in the kinetic energy of the fluid, with a consequent suppression in the gravitational wave power spectrum. In the present work, we track the wall speed and kinetic energy production in isolated droplets and compare them to those found in multi-bubble collisions. The late-time wall velocities that we observe match those of the 3D simulations, though we find that the spherical simulations are a poor predictor of the kinetic energy production. This implies that spherically symmetric simulations could be used to refine baryogenesis predictions due to the formation of droplets, but not to estimate any accompanying suppression of the gravitational wave signal.

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“…Due to spherical symmetry, we are able to evolve the equations of motion of Eqs. (13)(14)(15) on a 1D lattice. To do this, we use a simplified 1D version of the SCOTTS code used in Refs.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Droplet collapse during strongly supercooled transitions

Cutting¹,

Essi²,

Weir³

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In principle, the wall velocity v w (or corresponding Lorentz factor γ = (1 − v 2 w ) −1/2 ) is determined by the balancing condition between the vacuum energy pressure and the friction pressure [77]. In this paper, we simply take the Jouguet detonation [78]…”

Section: Various Parametersmentioning

confidence: 99%

Cosmology of Supercooled Universe

Kawana

2022

Preprint

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First-order phase transitions (FOPTs) are ubiquitous in physics beyond the Standard Model (SM). Recently, models with no dimensionful parameters in the tree-level action have been attracting much attention because they can predict a very strong FOPT with ultrasupercooling. In this paper, we study the cosmological signatures of such a supercooling model. As a concrete model, we consider the SM with two additional real scalars φ and S, which can realize the electroweak symmetry breaking via Coleman-Weinberg mechanism. One of the additional scalars S can naturally become a Dark Matter (DM) candidate due to the Z 2 symmetry of the action. We study the FOPT of this model and calculate the Gravitational Wave (GW) signals and the thermal relic abundance of S. As a result, we find that (i) the GW peak amplitude can reach ∼ 10 −10 around the frequency f ∼ 10 −3 Hz for some model parameters and (ii) the scalar mixing coupling λ φS is constrained to be 0.8 λ φS 1 in order to achieve both FOPT and DM relic abundance.

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“…where a(t) and v w are the scale factor at time t and the bubble wall velocity, respectively. The determination of v w is one of the challenging issues in the field of FOPTs [59]. We choose v w = 0.5 [60,61] as a benchmark value in this paper.…”

Section: Nucleation and Percolationmentioning

confidence: 99%

Gravitational waves in models with multicritical-point principle

Hamada,

Kawai,

Kawana

et al. 2022

Preprint

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The multicritical-point principle (MPP) provides a natural explanation of the large hierarchy between the Planck and electroweak scales. We consider a scenario in which MPP is applied to the Standard Model extended by two real singlet scalar fields φ and S, and a dimensional transmutation occurs by the vacuum expectation value of φ. In this paper, we focus on the critical points that possess a Z 2 symmetry S → −S and all the other fields are left invariant. Then S becomes a natural dark matter (DM) candidate. Further, we concentrate on the critical points where φ does not possess further Z 2 symmetry so that there is no cosmological domain-wall problem. Among such critical points, we focus on maximally critical one called CP-1234 that fix all the superrenormalizable parameters. We show that there remains a parameter region that satisfies the DM relic abundance, DM direct-detection bound and the current LHC constraints. In this region, we find a first-order phase transition in the early universe around the TeV-scale temperature. The resultant gravitational waves are predicted with a peak amplitude of O(10 −12 ) at a frequency of 10 −2 -10 −1 Hz, which can be tested with future space-based instruments such as DECIGO and BBO.

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Friction pressure on relativistic bubble walls

Cited by 9 publications

References 80 publications

Droplet collapse during strongly supercooled transitions

Droplet collapse during strongly supercooled transitions

Cosmology of Supercooled Universe

Gravitational waves in models with multicritical-point principle

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