共查询到20条相似文献,搜索用时 9 毫秒
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We consider solutions of the Yang-Mills-Higgs system coupled to gravity in asymptotically de Sitter space-time. The basic features of two classes of solutions are discussed, one of them corresponding to magnetic monopoles, the other one to sphalerons. We find that although the total mass within the cosmological horizon of these configurations is finite, their mass evaluated at timelike infinity generically diverges for most values of the cosmological constant. Also, no solutions exist in the absence of a Higgs potential. 相似文献
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Eckehard W. Mielke 《Physics letters. [Part B]》2011,702(4):187-190
Further consequences of a finite topological field theory for gravity based on the SL(5,R) gauge group are reported. After symmetry breaking, it induces four-dimensional Einstein spaces with a cosmological constant related to the tiny scale of the symmetry breaking. It is shown that not only a ‘background’ metric emerges from a Higgs-like mechanism, but also consistently the geodesic equation central to Einstein?s equivalence principle. In next order of the symmetry breaking scale, the induced torsion could even provoke a tiny Lorentz violation. 相似文献
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H.T. Nieh 《Physics letters. A》1982,88(8):388-390
In a fusing of a few attractive ingredients, we consider a spontaneously broken conformal gauge theory of gravitation, with an underlying Riemann-Cartan-Weyl geometry. The theory contains no intrinsic dimensional parameters, is unitary, and has the Schwarzschild metric as the unique spherically symmetric solution of the vacuum field equation (thus guaranteeing agreement with observed gravitational phenomena). The particle content of the theory consists of a massless 2. graviton, and a super-massive 1? “conformon”. 相似文献
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V.V. Belokurov D.I. Kazakov D.V. Shirkov A.A. Slavnov A.A. Vladimirov 《Physics letters. [Part B]》1973,47(4):359-360
The asymptotic invariant coupling constant (ICC) in the repulsive σ4 interaction is shown to be finite in the second logarithmic approximation. It leads to spontaneously broken gauge theories free of ultraviolet (UV) troubles. 相似文献
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Marco Fabbrichesi 《Pramana》2004,62(3):725-727
I discuss the generalization to global gauge anomalies of the familiar procedure for the cancellation of local gauge anomalies
in effective theories of spontaneously broken symmetries 相似文献
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M. Melles 《The European Physical Journal C - Particles and Fields》2002,24(2):193-204
Recent investigations of electroweak radiative corrections have revealed the importance of higher order contributions in
high energy processes, where the size of typical corrections can exceed those associated with QCD considerably. Beyond one
loop, only universal (angular independent) corrections are known to all orders except for massless processes, where also angle dependent corrections exist in the literature. In this paper we present general arguments for
the consistent resummation of angle dependent subleading (SL) logarithmic corrections to all orders in the regime where all
invariants are still large compared to the gauge boson masses. We discuss soft isospin correlations, fermion mass and gauge
boson mass gap effects, the longitudinal and Higgs boson sector as well as mixing contributions including CKM effects for
massive quarks. Two loop results for the right handed Standard Model are generalized in the context of the high energy effective
theory based on the standard model Lagrangian in the symmetric basis with the appropriate matching conditions to include the
soft QED regime. The result is expressed in exponentiated operator form in a CKM extended isospin space in the symmetric basis.
Thus, a full electroweak SL treatment based on the infrared evolution equation method is formulated for arbitrary high energy
processes at future colliders. Comparisons with known results are presented.
Received: 12 February 2002 / Revised version: 7 March 2002 / Published online: 8 May 2002 相似文献
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We study the nonlocal regularization for the case of a spontaneously broken abelian gauge theory in the R-gauge with an arbitrary gauge parameter . We consider a simple abelian-Higgs model with chiral couplings as an example. We show that if we apply the nonlocal regularization procedure (to construct a nonlocal theory with FINITE mass parameter) to the spontaneously broken R-gauge Lagrangian, using the quadratic forms as appearing in this Lagrangian, we find that a physical observable in this model, an analogue of the muon anomalous magnetic moment, evaluated to order O [g2] does indeed show -dependence. We then apply the modified form of nonlocal regularization that was recently advanced and studied for the unbroken non-abelian gauge theories and discuss the resulting WT identities and -independence of the S-matrix elements. 相似文献
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Jan T. Łopuszański 《Reports on Mathematical Physics》1978,13(1):37-55
It is shown that every spontaneous breaking of supersymmetry can be accomplished by means of a locally conserved supercurrent , where is a massless field satisfying the Weyl Equation. For a given supercurrent the necessary condition that it will break spontaneously the supersymmetry is It is shown that the anticommutation relations of the broken supercharges are not related to the energy-momentum vector.Similar procedure applied in case of a vector field is inconclusive.The extension of the Maisson and Reeh statement on the helicity of Goldstone fields is given. 相似文献
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We discuss the concept of spontaneous breaking of gauge symmetry in super-conductors and superfluids and, in particular, the circumstances under which the absolute phase of a superfluid can be physically meaningful and experimentally relevant. We argue that the study of this question pushes us toward the frontiers of what we understand about the quantum measurement process, and underline the need for a new theoretical framework that keeps pace with modern technological capabilities. 相似文献
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The reduction of a theory with gauge group G to a theory which is gauge invariant with respect to a subgroup H of G is formulated in a geometrical language. It is assumed that among the physical fields considered as cross-sections of fibre bundles with structure group G there exists a section of the fibre bundle with fibre isomorphic to G/H — a Higgs field. The investigation of the broken gauge symmetry is based on the reduction theorem for structure groups of principal fibre bundles. The reduction of fields and their covariant derivatives is studied. 相似文献
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The one-loop quadratically divergent mass corrections in globally supersymmetric gauge theories with spontaneously broken abelian and non-abelian gauge symmetry are studied. Quadratically divergent mass corrections are found to persist in an abelian model with an ABJ anomaly. However, additional supermultiplets necessary to cancel the ABJ anomaly, turn out to be sufficient to eliminate the quadratic divergences as well, rendering the theory natural. Quadratic divergences are shown to vanish also in the case of an anomaly free model with spontaneously broken non-abelian gauge symmetry. 相似文献
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When the four mass parameters of spontaneously broken N = 8 supergravity are taken to be equal, the theory possesses at global SU(4) symmetry. Since it contains massless vectors in the adjoint representation, it is tempting to add gauge interactions so as to make the SU(4) symmetry local. In this paper we show that it is impossible to do this in a way that is consistent with the spontaneous character of the symmetry breaking. 相似文献