Fate of electroweak symmetry in the early Universe: non-restoration and trapped vacua in the N2HDM

Biekötter, Thomas; Heinemeyer, S.; No, José Miguel; Olea, María Olalla; Weiglein, G.

doi:10.1088/1475-7516/2021/06/018

Cited by 41 publications

(42 citation statements)

References 128 publications

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“…The general concept of symmetry non-restoration (SNR) was first explored by Weinberg [1] and then expanded upon in [2][3][4][5][6][7][8][9][10][11][12][13][14]. Recently, scenarios of SNR for the electroweak sector, and the associated phenomenological observables, have become a topic of investigation [15][16][17][18][19][20][21][22]. Electroweak SNR is of special interest in the context of certain baryogenesis scenarios [23].…”

Section: Introductionmentioning

confidence: 99%

Electroweak symmetry non-restoration from dark matter

Matsedonskyi

Unwin

Wang

2021

J. High Energ. Phys.

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Restoration of the electroweak symmetry at temperatures around the Higgs mass is linked to tight phenomenological constraints on many baryogenesis scenarios. A potential remedy can be found in mechanisms of electroweak symmetry non-restoration (SNR), in which symmetry breaking is extended to higher temperatures due to new states with couplings to the Standard Model. Here we show that, in the presence of a second Higgs doublet, SNR can be realized with only a handful of new fermions which can be identified as viable dark matter candidates consistent with all current observational constraints. The competing requirements on this class of models allow for SNR at temperatures up to ∼TeV, and imply the presence of sub-TeV new physics with sizable interactions with the Standard Model. As a result this scenario is highly testable with signals in reach of next-generation collider and dark matter direct detection experiments.

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Section: Introductionmentioning

confidence: 99%

Electroweak symmetry non-restoration from dark matter

Matsedonskyi

Unwin

Wang

2021

J. High Energ. Phys.

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“…In order to achieve such a transition, it is required (just as in the 2HDM) to consider parameter space JHEP10(2021)215 regions where large loop corrections to the scalar potential are present, since at tree level the scalar potential does not allow for an EW phase transition of first order. The required loop corrections have their origin in values of one or more |λ 1,2,3,4,5 | > 1 [33]. As a result, our analysis indicates that for a perturbative study of the parameter regions of the S2HDM relevant for possible first-order EW phase transitions, it is of crucial importance to take into account constraints in relation to the perturbative unitarity and the RGE running of the quartic couplings.…”

Section: Jhep10(2021)215mentioning

confidence: 72%

“…The analysis of the thermal history of the scalar potential of the S2HDM is beyond the scope of this paper (see ref. [33] for an N2HDM analysis), such that we demand the most conservative constraint, i.e. excluding all parameter points for which the EW minimum is not the global minimum of the potential.…”

Section: Jhep10(2021)215mentioning

confidence: 99%

“…One of such possibilities is that pNG DM can be incorporated into 2 Higgs doublet models (2HDM) (see ref. [31] for a review), in which, in contrast to the pNG DM model with only one Higgs doublet [32], a first-order EW phase transition can be realized [29,33]. Such a transition provides a departure from thermal equilibrium, required to explain the matter-antimatter asymmetry via the mechanism of EW baryogenesis [34,35].…”

Section: Introductionmentioning

confidence: 99%

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Reconciling Higgs physics and pseudo-Nambu-Goldstone dark matter in the S2HDM using a genetic algorithm

Biekötter

Olea-Romacho

2021

J. High Energ. Phys.

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We investigate a possible realization of pseudo-Nambu-Goldstone (pNG) dark matter in the framework of a singlet-extended 2 Higgs doublet model (S2HDM). pNG dark matter gained attraction due to the fact that direct-detection constraints can be avoided naturally because of the momentum-suppressed scattering cross sections, whereas the relic abundance of dark matter can nevertheless be accounted for via the usual thermal freeze-out mechanism. We confront the S2HDM with a multitude of theoretical and experimental constraints, paying special attention to the theoretical limitations on the scalar potential, such as vacuum stability and perturbativity. In addition, we discuss the complementarity between constraints related to the dark matter sector, on the one hand, and to the Higgs sector, on the other hand. In our numerical discussion we explore the Higgs funnel region with dark matter masses around 60 GeV using a genetic algorithm. We demonstrate that the S2HDM can easily account for the measured relic abundance while being in agreement with all relevant constraints. We also discuss whether the so-called center-of-galaxy excesses can be accommodated, possibly in combination with a Higgs boson at about 96 GeV that can be the origin of the LEP- and the CMS-excess observed at this mass in the b$$ \overline{b} $$ b ¯ -quark and the diphoton final state, respectively.

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“…As discussed in Refs. [37,38], taking into account the thermal history of models with multiple scalar fields, one finds that a parameter point featuring a global EW minimum at zero temperature may still be unphysical. This happens if the transition to the EW vacuum would have occurred via a first-order phase transition, but the transition probabilities turn out to be never large enough to allow the onset of the bubble nucleation of true EW vacuum bubbles in the early universe.…”

Section: The Neutral Scalar Sector Of the µνSsmmentioning

confidence: 99%

Vacuum (meta-)stability in the $μν$SSM

Biekötter,

Heinemeyer,

Weiglein

2021

Preprint

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We perform an analysis of the vacuum stability of the neutral scalar potential of the µ-from-ν Supersymmetric Standard Model (µνSSM). As an example scenario, we discuss the alignment-without-decoupling limit of the µνSSM, for which the required conditions on the Higgs sector are derived. We demonstrate that in this limit large parts of the parameter space feature unphysical minima that are deeper than the electroweak minimum. In order to estimate the lifetime of the electroweak vacuum, we calculate the rates for the tunneling process into each unphysical minimum. We find that in many cases the resulting lifetime is longer than the age of the universe, such that the considered parameter region is not excluded. On the other hand, we also find parameter regions in which the EW vacuum is short-lived. We investigate how the different regions of stability are related to the presence of light right-handed sneutrinos. Accordingly, a vacuum stability analysis that accurately takes into account the possibility of long-lived metastable vacua is crucial for a reliable assessment of the phenomenological viability of the parameter space of the µνSSM and its resulting phenomenology at the (HL)-LHC.

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Fate of electroweak symmetry in the early Universe: non-restoration and trapped vacua in the N2HDM

Cited by 41 publications

References 128 publications

Electroweak symmetry non-restoration from dark matter

Electroweak symmetry non-restoration from dark matter

Reconciling Higgs physics and pseudo-Nambu-Goldstone dark matter in the S2HDM using a genetic algorithm

Vacuum (meta-)stability in the $μν$SSM

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