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We study solutions to the Kapustin--Witten equations on ALE and ALF gravitational instantons. On any such space and for any compact structure group, we prove asymptotic estimates for the Higgs field. We then use it to prove a vanishing theorem in the case when the underlying manifold is $\mathrm{R}^4$ or $\mathrm{R}^3 \times \mathbb{S}^1$ and the structure group is $\mathrm{SU} (2)$., Comment: 12 pages, no figures. A mistake in the main theorem is fixed; supersedes published version

In the recently discovered Chern-Simons model, the reduction to a Bogomol'nyi bound or self-duality depends crucially on the specific form of the Higgs potential energy function, which is characterized by a φ6 type self-interaction. The purpose of this paper is to show that a much wider class of Higgs self-interaction may be allowed to achieve self-duality provided that the kinetic energy term of the Higgs scalar is suitably modified. The existence of topological multivortex solutions is also established. Furthermore, it is remarked that the Meissner effect may occur in the model.

We provide an axiomatic Euclidean field-theoretic treatment of the Meissner and Abelian Higgs effects, which extends our previous method to a fully quantum theoretic model of a gauge field, with U(1) symmetry, coupled to a scalar field. Our main results are that the former effect implies the latter one, and ensues from the condition of off-diagonal long-range order.

A complete set of gauge invariant quantities for generic configurations of the theory of an SU(3) gauge field interacting with a Higgs field in the fundamental representation is constructed. Among the invariants, there appear quantities of a nontensorial type reflecting the nontrivial topological structure of the gauge orbit space. In the terminology introduced by Mandelstam, our description of classes of gauge invariant configurations corresponds to the superconductivity phase of this model containing magnetic monopoles which are confined by magnetic vortices.

It is possible to construct non-Abelian field theories by gauging Kac-Moody algebras. Here we discuss the spontaneous symmetry breaking of such theories via the Higgs mechanism. If the Higgs particle lies in the Cartan subalgebra of the Kac-Moody algebra, the previously massless vectors acquire a mass spectrum that is linear in the Kac-Moody index and has additional fine structure depending on the associated Lie algebra.

In this Letter we investigate the lattice version of a certain non-Abelian Higgs model, the theory of a SU(2)-gauge field interacting with a matter field in the adjoint representation.

In the nonabelian SU(2) gauge Higgs model, the explicit meron-meron solution is given for a discrete value of the coupling constant of the scalar fields.

We prove that the Prasad-Sommerfield dyon (monopole) solution for an SU(2) Yang-Mills field coupled with an SU(2) Higgs multiplet can be associated to a certain minimal immersion in S3 (≃SU(2)) i.e. it has a differential-geometric content similar to that of self-dual solutions for the pure SU(2) Yang-Mills field. Implications of this result as well as possibilities to extend it to higher gauge groups are discussed.

The process of the reduction of a principal fibre bundle P(M, G) to a reduced subbundle Q(M, H) is analysed in view of applications to the description of symmetries of gauge theories. The main idea is to relate symmetries of the nonuniqueness of the reduction by gauging the different ways in which for each fiber the unbroken group H is imbedded into the large group G. Gauge theories encompassing gravitation are especially taken into account.

We study finite-energy configurations in SO(N) gauge theories with Higgs fields in the fundamental representation. For all winding numbers, noncontractible hyperloops are constructed. The corresponding energy density is spherically symmetric, and the configuration with maximal energy on each hyperloop can be determined. Noncontractible hyperloops with an arbitrary winding number for SU(2) gauge theory are also given.

A unified treatment of Yang-Mills and Higgs fields in classical gauge theory is carried out in a general relativistic context. A presymplectic formalism for a spinless test particle dwelling in this background geometry is described. The mass of this particle is found to depend specifically upon its generalized isospin and the Higgs field. This mass generating process is very much reminiscent of the so-called Yukawa coupling in the (electro-weak) standard model. The space of motions (phase space) is constructed together with a set of generalized Wong equations. Comparison with the Marsden-Weinstein symplectic reduction procedure is achieved.

Any gauge theory is proved to arise from spontaneous breakdown of symmetry under certain infinite parameter group, the corresponding gauge field being the Goldstone field by which this breakdown is accompanied.

A new series of models is introduced by adding Higgs fields to the earlier proposed Euclidean four-dimensional Skyrme-like models with Yang-Mills composite fields constructed from Stiefel manifold-valued fields. The classical static versions of these models are discussed. The connection with the monopole solutions of the Yang-Mills-Higgs models in the Prasad-Sommerfield limit is pointed out and the BPS monopole is reobtained as an example.

The geometrical and mechanical aspects of a particle interacting with a Poincare gauge field are considered and the relation with a gravitational interaction is studied.

The principle of general covariance for deriving the passive equations is applied to the group of automorphisms of compact support of a principal bundle acting on the space of Cartan connections. Under an orbital constraint this yields the equations of motion postulated in [11] which have a symplectic character. When specialized to an affine connection these equations become the equations of interaction of spin and torsion studied in [5]. With the incorporation of a Higgs field, a forcing term is added to the equations which, in the case of an electromagnetic field, incorporate the effects of the magnetic moment. The Higgs field is of the character obtained by dimensional reduction.

We consider an extension of the supersymmetry formalism in order to include gauge fields. We construct a fiber bundle P(M 4×{θ}, G) over the superspace with the gauge group as the structural group. We obtain the equations of interacting pure Yang-Mills and massless Higgs fields, considering these fields as the components of the same gauge field. Moreover, by fixing a gauge we generate a mass as a result of the supersymmetry breaking.

Phase transition, non-perturbative particle spectra including fermion-boson bound states and dynamical generation of topological gauge-invariant mass terms for the gauge fields in the general class of three-dimensional Higgs models with fermions are derived within the 1/N expansion.