Singlet-assisted electroweak phase transition at two loops

Niemi, Lauri; Schicho, Philipp; Tenkanen, Tuomas V. I.

doi:10.1103/physrevd.103.115035

Cited by 80 publications

(64 citation statements)

References 68 publications

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“…The well known breakdown of the perturbative expansion at high temperature [180] due to the presence of infrared bosonic modes can be ameliorated by performing dimensional reduction techniques [68,181,182]. Such a dedicated study is left for future work.…”

Section: Jhep02(2022)017mentioning

confidence: 99%

Electroweak bubble wall expansion: gravitational waves and baryogenesis in Standard Model-like thermal plasma

Lewicki

Merchand

Zych

2022

J. High Energ. Phys.

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Computing the properties of the bubble wall of a cosmological first order phase transition at electroweak scale is of paramount importance for the correct prediction of the baryon asymmetry of the universe and the spectrum of gravitational waves. By means of the semiclassical formalism we calculate the velocity and thickness of the wall using as theoretical framework the scalar singlet extension of the SM with a parity symmetry and the SM effective field theory supplemented by a dimension six operator. We use these solutions to carefully predict the baryon asymmetry and the gravitational wave signals. The singlet scenario can easily accommodate the observed asymmetry but these solutions do not lead to observable effects at future gravity wave experiments. In contrast the effective field theory fails at explaining the baryon abundance due to the strict constraints from electric dipole moment experiments, however, the strongest solutions we found fall within the sensitivity of the LISA experiment. We provide a simple analytical approximation for the wall velocity which only requires calculation of the strength and temperature of the transition and works reasonably well in all models tested. We find that generically the weak transitions where the fluid approximation can be used to calculate the wall velocity and verify baryogenesis produce signals too weak to be observed in future gravitational wave experiments. Thus, we infer that GW signals produced by simple SM extensions visible in future experiments are likely to only result from strong transitions described by detonations with highly relativistic wall velocities.

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Section: Jhep02(2022)017mentioning

confidence: 99%

Electroweak bubble wall expansion: gravitational waves and baryogenesis in Standard Model-like thermal plasma

Lewicki

Merchand

Zych

2022

J. High Energ. Phys.

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“…A future refinement of our study should use the methods of dimensional reduction which can automatically deal with resummations and can even be combined with lattice data to capture non-perturbative effects (for recent pedagogical examples of dimensional reduction, see e.g. [24,[50][51][52]). It should also study quantities related to the nucleation of bubbles more quantitatively.…”

Section: Jhep10(2021)127mentioning

confidence: 99%

A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory

Camargo-Molina

Enberg

Löfgren

2021

J. High Energ. Phys.

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A first-order Electroweak Phase Transition (EWPT) could explain the observed baryon-antibaryon asymmetry and its dynamics could yield a detectable gravitational wave signature, while the underlying physics would be within the reach of colliders. The Standard Model, however, predicts a crossover transition. We therefore study the EWPT in the Standard Model Effective Field Theory (SMEFT) including dimension-six operators. A first-order EWPT has previously been shown to be possible in the SMEFT. Phenomenology studies have focused on scenarios with a tree-level barrier between minima, which requires a negative Higgs quartic coupling and a new physics scale low enough to raise questions about the validity of the EFT approach. In this work we stress that a first-order EWPT is also possible when the barrier between minima is generated radiatively, the quartic coupling is positive, the scale of new physics is higher, and there is good agreement with experimental bounds. Our calculation is done in a consistent, gauge-invariant way, and we carefully analyze the scaling of parameters necessary to generate a barrier in the potential. We perform a global fit in the relevant parameter space and explicitly find the points with a first-order transition that agree with experimental data. We also briefly discuss the prospects for probing the allowed parameter space using di-Higgs production in colliders.

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“…Building on these earlier works, later studies using dimensional reduction to study hot electroweak theories have typically performed complete O(g 4 ) computations, for which the cancellation of renormalisation scale dependence serves as a useful crosscheck (c.f. for example [80][81][82][83][84][85][86][87][88][89][90][91][92][93]).…”

Section: Introductionmentioning

confidence: 99%

“…In theories with non-Z 2 -symmetric scalars, there is also a term at this order arising from thermal contributions to the tadpole; see for example Refs. [76,92,93]. For a beyond the Standard Model theory with an extra Z 2 -symmetric scalar S the thermal self-energy of the Higgs scalar is schematically…”

mentioning

confidence: 99%

“…[66,[68][69][70]. Similar computations in theories beyond the SM include [88,90] (2HDM), [89,91] (real-triplet) and [76,93] (real-singlet); works that all utilise dimensional reduction to three-dimensional effective theories at high temperature. The cancellation of scale dependence is an important consistency check in the construction of these high temperature effective field theories.…”

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confidence: 99%

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On the perturbative expansion at high temperature and implications for cosmological phase transitions

Gould,

Tenkanen

2021

Preprint

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We revisit the perturbative expansion at high temperature and investigate its convergence by inspecting the renormalisation scale dependence of the effective potential. Although at zero temperature the renormalisation group improved effective potential is scale independent at one-loop, we show how this breaks down at high temperature, due to the misalignment of loop and coupling expansions. Following this, we show how one can recover renormalisation scale independence at high temperature, and that it requires computations at two-loop order. We demonstrate how this resolves some of the huge theoretical uncertainties in the gravitational wave signal of first-order phase transitions, though uncertainties remain stemming from the computation of the bubble nucleation rate.

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Singlet-assisted electroweak phase transition at two loops

Cited by 80 publications

References 68 publications

Electroweak bubble wall expansion: gravitational waves and baryogenesis in Standard Model-like thermal plasma

Electroweak bubble wall expansion: gravitational waves and baryogenesis in Standard Model-like thermal plasma

A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory

On the perturbative expansion at high temperature and implications for cosmological phase transitions

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