Symmetry nonrestoration at high temperature in little Higgs models

Espinosa, J. R.; Losada, M.; Riotto, Antonio

doi:10.1103/physrevd.72.043520

Cited by 47 publications

(60 citation statements)

References 27 publications

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“…As already discussed in [10], it is easy to check that with the prescription of eq. (19) scalar fluctuations are automatically canonical.…”

Section: An Efficient Way Of Dealing With Scalar Fluctuationsmentioning

confidence: 91%

“…Once this is done there will be also a scalar contribution to the supertrace in (63) and the main purpose of this paper has been to compute this new contribution and discuss what impact it might have for the phenomenology of LH models. In calculating this new scalar contribution to the effective potential we have used with advantage a technique proposed recently in [10] which greatly simplifies the task.…”

Section: Discussionmentioning

confidence: 99%

“…Let us now discuss the method introduced in [10] to compute the masses of scalar fluctuations (i.e. the degrees of freedom in Σ itself) for instance in a simple background…”

Section: An Efficient Way Of Dealing With Scalar Fluctuationsmentioning

confidence: 99%

“…Instead of following this standard procedure, ref. [10] used an alternative method which simplifies the calculations and has many appealing features.…”

Section: An Efficient Way Of Dealing With Scalar Fluctuationsmentioning

confidence: 99%

“…The programme then might be straightforward but seems rather cumbersome and tedious. Fortunately, a method recently developed in [10] to deal efficiently with scalar fluctuations in nonlinear sigma models, is ideally suited for our task.…”

Section: Introductionmentioning

confidence: 99%

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Scalar loops in little Higgs models

Espinosa¹,

No²

2007

J. High Energy Phys.

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Loops of the scalar particles present in Little Higgs models generate radiatively scalar operators that have been overlooked before in Little Higgs analyses. We compute them using a technique, recently proposed to deal with scalar fluctuations in non-linear sigma models, that greatly simplifies the calculation. In particular models some of these operators are not induced by loops of gauge bosons or fermions, are consistent with the Little Higgs symmetries that protect the Higgs boson mass, and must also be included in the Lagrangian. In general, scalar loops multiplicatively renormalize the tree-level scalar operators,] with large N (e.g. N ∼ 20 for the Littlest Higgs), suggesting a true UV cutoff Λ < ∼ 4πf / √ N significantly below the estimate 4πf of naive dimensional analysis. This can have important implications for the phenomenology and viability of Little Higgs models.

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“…As already discussed in [10], it is easy to check that with the prescription of eq. (19) scalar fluctuations are automatically canonical.…”

Section: An Efficient Way Of Dealing With Scalar Fluctuationsmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

“…Let us now discuss the method introduced in [10] to compute the masses of scalar fluctuations (i.e. the degrees of freedom in Σ itself) for instance in a simple background…”

Section: An Efficient Way Of Dealing With Scalar Fluctuationsmentioning

confidence: 99%

“…Instead of following this standard procedure, ref. [10] used an alternative method which simplifies the calculations and has many appealing features.…”

Section: An Efficient Way Of Dealing With Scalar Fluctuationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Scalar loops in little Higgs models

Espinosa¹,

No²

2007

J. High Energy Phys.

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Can a pseudo-Nambu-Goldstone Higgs lead to symmetry non-restoration?

Kılıç

Swaminathan

2016

J. High Energ. Phys.

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The calculation of finite temperature contributions to the scalar potential in a quantum field theory is similar to the calculation of loop corrections at zero temperature. In natural extensions of the Standard Model where loop corrections to the Higgs potential cancel between Standard Model degrees of freedom and their symmetry partners, it is interesting to contemplate whether finite temperature corrections also cancel, raising the question of whether a broken phase of electroweak symmetry may persist at high temperature. It is well known that this does not happen in supersymmetric theories because the thermal contributions of bosons and fermions do not cancel each other. However, for theories with same spin partners, the answer is less obvious. Using the Twin Higgs model as a benchmark, we show that although thermal corrections do cancel at the level of quadratic divergences, subleading corrections still drive the system to a restored phase. We further argue that our conclusions generalize to other well-known extensions of the Standard Model where the Higgs is rendered natural by being the pseudo-Nambu-Goldstone mode of an approximate global symmetry.

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Towards TeV-scale supersymmetric electroweak baryogenesis

Matsedonskyi

Unwin

Wang

2023

J. High Energ. Phys.

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Electroweak baryogenesis (EWBG) offers a compelling narrative for the generation of the baryon asymmetry, however it cannot be realised in the Standard Model, and leads to severe experimental tensions in the Minimal Supersymmetric Standard Model (MSSM). One of the reasons for these experimental tensions is that in traditional approaches to EWBG new physics is required to enter at the electroweak phase transition, which conventionally is fixed near 100 GeV. Here we demonstrate that the addition of sub-TeV fields in supersymmetric extensions of the Standard Model permits TeV-scale strongly first-order electroweak phase transition. While earlier literature suggested no-go arguments with regards to high-temperature symmetry breaking in supersymmetric models, we show these can be evaded by employing a systematic suppression of certain thermal corrections in theories with a large number of states. The models presented push the new physics needed for EWBG to higher scales, hence presenting new parameter regions in which to realize EWBG and evade experimental tensions, however they are not expected to render EWBG completely outside of the foreseeable future experimental reach.

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Symmetry nonrestoration at high temperature in little Higgs models

Cited by 47 publications

References 27 publications

Scalar loops in little Higgs models

Scalar loops in little Higgs models

Can a pseudo-Nambu-Goldstone Higgs lead to symmetry non-restoration?

Towards TeV-scale supersymmetric electroweak baryogenesis

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