arXiv subjects

Jennifer Vaughan

Publications and source records attributed to Jennifer Vaughan.

6 recordsLinked to original sources

arXiv2021

Multiplicative vector fields on bundle gerbes

Infinitesimal symmetries of $S^1$-bundle gerbes are modelled with multiplicative vector fields on Lie groupoids. It is shown that a connective structure on a bundle gerbe gives rise to a natural horizontal lift of multiplicative vector fields to the bundle gerbe, and that the 3-curvature presents the obstruction to the horizontal lift being a morphism of Lie 2-algebras. Connection-preserving multiplicative vector fields on a bundle gerbe with connective structure are shown to inherit a natural Lie 2-algebra structure; moreover, this Lie 2-algebra is canonically quasi-isomorphic to the Poisson-Lie 2-algebra of the 2-plectic base manifold $(M,χ)$, where $χ$ is the 3-curvature of the connective structure. As an application of this result, we give analogues of a formula of Kostant in the 2-plectic and quasi-Hamiltonian context.

math.DG↗

arXiv2017

Equivariant Metaplectic-c Prequantization of Symplectic Manifolds with Hamiltonian Torus Actions

This paper determines a condition that is necessary and sufficient for a metaplectic-c prequantizable symplectic manifold with an effective Hamiltonian torus action to admit an equivariant metaplectic-c prequantization. The condition is evaluated at a fixed point of the momentum map, and is shifted from the one that is known for equivariant prequantization line bundles. Given a metaplectic-c prequantized symplectic manifold with a Hamiltonian energy function, the author previously proposed a condition under which a regular value of the function should be considered a quantized energy level of the system. This definition naturally generalizes to regular values of the momentum map for a Hamiltonian torus action. We state the generalized definition for such a system, and use an equivariant metaplectic-c prequantization to determine its quantized energy levels.

math.SG↗

arXiv2015

Metaplectic-c Quantized Energy Levels of the Hydrogen Atom

This paper calculates the quantized energy levels of the hydrogen atom, using a metaplectic-c prequantization bundle and a definition of a quantized energy level that was introduced by the author in a previous paper. The calculation makes use of a computational technique also demonstrated in that paper. The result is consistent with the standard quantum mechanical prediction. Unlike other treatments of the hydrogen atom, this approach does not require the construction of the symplectic reduction, but takes place over a regular level set of the energy function. The Ligon-Schaaf regularization map is used to transform the problem into one of determining the quantized energy levels of a free particle on the tangent bundle for S3.

math.SG↗

arXiv2015

Dynamical Invariance of a New Metaplectic-c Quantization Condition

Metaplectic-c quantization was developed by Robinson and Rawnsley as an alternative to the classical Kostant-Souriau quantization procedure with half-form correction. Given a metaplectic-c quantizable symplectic manifold M and a smooth function H on M, this paper proposes a condition under which E, a regular value of H, is a quantized energy level for the system. The condition is evaluated on a bundle over the level set of H at E. We prove that the result depends only on the geometry of the level set, and not on the dynamics of a particular function, improving on an earlier construction by Robinson.

math.SG↗

arXiv2015

Metaplectic-c Quantomorphisms

In the classical Kostant-Souriau prequantization procedure, the Poisson algebra of a symplectic manifold $(M,ω)$ is realized as the space of infinitesimal quantomorphisms of the prequantization circle bundle. Robinson and Rawnsley developed an alternative to the Kostant-Souriau quantization process in which the prequantization circle bundle and metaplectic structure for $(M,ω)$ are replaced by a metaplectic-c prequantization. They proved that metaplectic-c quantization can be applied to a larger class of manifolds than the classical recipe. This paper presents a definition for a metaplectic-c quantomorphism, which is a diffeomorphism of metaplectic-c prequantizations that preserves all of their structures. Since the structure of a metaplectic-c prequantization is more complicated than that of a circle bundle, we find that the definition must include an extra condition that does not have an analogue in the Kostant-Souriau case. We then define an infinitesimal quantomorphism to be a vector field whose flow consists of metaplectic-c quantomorphisms, and prove that the space of infinitesimal metaplectic-c quantomorphisms exhibits all of the same properties that are seen for the infinitesimal quantomorphisms of a prequantization circle bundle. In particular, this space is isomorphic to the Poisson algebra $C^\infty(M)$.

math.SG↗

arXiv2009

Model Discrimination at the LHC: a Case Study

We investigate the potential of the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) to discriminate between two theoretical models predicting anomalous events with jets and large missing transverse energy, minimal supersymmetry and Little Higgs with T Parity. We focus on a simple test case scenario, in which the only exotic particles produced at the LHC are heavy color-triplet states (squarks or T-quarks), and the only open decay channel for these particles is into the stable missing-energy particle (neutralino or heavy photon) plus a quark. We find that in this scenario, the angular and momentum distributions of the observed jets are sufficient to discriminate between the two models with a few inverse fb of the LHC data, provided that these distributions for both models and the dominant Standard Model backgrounds can be reliably predicted by Monte Carlo simulations.

hep-ph↗