Varying alpha and the electroweak model

Kimberly, Dagny; Magueijo, João

doi:10.1016/j.physletb.2004.01.050

Cited by 37 publications

(36 citation statements)

References 29 publications

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“…In order to evaluate the constraints introduced by a programme of unification, it is important to extend these simple models to include electroweak and grand unification. Kimberly and Magueijo [39] have proposed an extensions to the Glashow-Salam-Weinberg (GSW) electroweak theory in which the weak couplings can also vary in space and time and which reduces to the standard GSW theory in the limit of no variation.…”

Section: The Simplest Modelmentioning

confidence: 99%

“…[31,34,35,36,37,38]. A further step has recently been taken by Kimberly and Magueijo [39] who have extended the BSBM theory to create a generalisation of the Glashow-Salam-Weinberg theory to allow variation of the electromagnetic and weak couplings. This allows the consequences of electroweak unification to be investigated self consistently for the first time.…”

Section: Introductionmentioning

confidence: 99%

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Varying couplings in electroweak theory

Shaw

Barrow

2005

Phys. Rev. D

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We extend the theory of Kimberly and Magueijo for the spacetime variation of the electroweak couplings in the unified Glashow-Salam-Weinberg model of the electroweak interaction to include quantum corrections. We derive the effective quantum-corrected dilaton evolution equations in the presence of a background cosmological matter density that is composed of weakly interacting and non-weakly-interacting non-relativistic dark-matter components.

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Section: The Simplest Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Varying couplings in electroweak theory

Shaw

Barrow

2005

Phys. Rev. D

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“…This approach was first superseded in the case of varying G by the creation of scalar-tensor theories of gravity [6], culminating in the standard form of Brans and Dicke [7] in which G varies through a dynamical scalar field which conserves energy and momentum and contributes to the curvature of spacetime by a means of a set of generalised gravitational field equations. More recently, such self-consistent descriptions of the spacetime variation of other constants, like α [8,9], the electroweak couplings [10], and the electron-proton mass ratio, µ, [11] have been formulated although most observational constraints in the literature are imposed by simply making constants into variables in formulae derived under the assumption that are constant.…”

Section: Introductionmentioning

confidence: 99%

Local effects of cosmological variations in physical “constants” and scalar fields. II. Quasispherical spacetimes

Shaw

Barrow

2006

Phys. Rev. D

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We investigate the conditions under which cosmological variations in physical 'constants' and scalar fields are detectable on the surface of local gravitationally-bound systems, such as planets, in non-spherically symmetric background spacetimes. The method of matched asymptotic expansions is used to deal with the large range of length scales that appear in the problem. We derive a sufficient condition for the local time variation of the scalar fields driving variations in 'constants' to track their large-scale cosmological variation and show that this is consistent with our earlier conjecture derived from the spherically symmetric problem. We perform our analysis with spacetime backgrounds that are of Szekeres-Szafron type. They are approximately Schwarzschild in some locality and free of gravitational waves everywhere. At large distances, we assume that the spacetime matches smoothly onto a Friedmann background universe. We conclude that, independent of the details of the scalar-field theory describing the varying 'constant', the condition for its cosmological variations to be measured locally is almost always satisfied in physically realistic situations. The very small differences expected to be observed between different scales are quantified. This strengthens the proof given in our previous paper that local experiments see global variations by dropping the requirement of exact spherical symmetry. It provides a rigorous justification for using terrestrial experiments and solar system observations to constraint or detect any cosmological time variations in the traditional 'constants' of Nature in the case where non-spherical inhomogeneities exist.

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“…(2)). Constraints on the dilatonic coupling in extensions of the standard electroweak model [65,66] have recently been imposed by the LHC [67][68][69].…”

Section: Conclusion-discussionmentioning

confidence: 99%

Dilatonic topological defects in3+1dimensions and their embeddings

2014

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We consider Lagrangians in 3+1 dimensions admitting topological defects where there is an additional coupling between the defect scalar field Φ and the gauge field kinetic term (eg B(|Φ| 2 )Fµν F µν ). Such a dilatonic coupling in the context of a static defect, induces a spatially dependent effective gauge charge and effective mass for the scalar field which leads to modified properties of the defect core. In particular, the scale of the core gets modified while the stability properties of the corresponding embedded defects are also affected. These modifications are illustrated for gauged (Nielsen-Olesen) vortices and for gauged ('t Hooft-Polyakov) monopoles. The corresponding dilatonic global defects are also studied in the presence of an external gauge field.

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Varying alpha and the electroweak model

Cited by 37 publications

References 29 publications

Varying couplings in electroweak theory

Varying couplings in electroweak theory

Local effects of cosmological variations in physical “constants” and scalar fields. II. Quasispherical spacetimes

Dilatonic topological defects in3+1dimensions and their embeddings

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