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32 papers · 1 filter
Geometric Phase, Bundle Classification, and Group Representation
Ali Mostafazadeh
The line bundles which arise in the holonomy interpretations of the geometric phase display curious similarities to those encountered in the statement of the Borel-Weil-Bott theore…
Tunnelling geometries II. Reduction methods for functional determinants
A. O. Barvinsky
The reduction algorithms for functional determinants of differential operators on spacetime manifolds of different topological types are presented, which were recently used for the…
Tunnelling geometries I. Analyticity, unitarity and instantons in quantum cosmology
A. O. Barvinsky, A. Yu. Kamenshchik
We present a theory of tunnelling geometries originating from the no-boundary quantum state of Hartle and Hawking. We reformulate the no-boundary wavefunction in the representation…
Solving the Hamilton-Jacobi Equation for General Relativity
J. Parry D. S. Salopek, J. M. Stewart
We demonstrate a systematic method for solving the Hamilton-Jacobi equation for general relativity with the inclusion of matter fields. The generating functional is expanded in a s…
Self-dual gravity as a two dimensional theory and conservation laws
Viqar Husain
Starting from the Ashtekar Hamiltonian variables for general relativity, the self-dual Einstein equations (SDE) may be rewritten as evolution equations for three divergence free ve…
Topological Mass Generation in Three-Dimensional String Theory
Nemanja Kaloper
The effective action of string theory in three dimensions is investigated, incorporating the Lorentz and gauge Chern-Simons terms in the definition of the Kalb-Ramond axion field s…
Model independent constraints on leptoquarks from rare processes
Sacha Davidson, David Bailey, Bruce A. Campbell
We present model independent constraints on the masses and couplings to fermions of and conserving leptoquarks. Such vector or scalar particles could have masses below 100…
Two-loop renormalization group analysis of hadronic decays of a charged Higgs boson
Andrzej Czarnecki, Andrei I. Davydychev
We calculate next-to-leading QCD corrections to the decay for generic up and down quarks in the final state. A recently developed algorithm for evaluation of mass…
Dynamical Origin of the Entropy of a Black Hole
Valery Frolov, Igor Novikov
Modes of physical fields which are located inside a horizon and which cannot be observed by a distant observer are identified with dynamical degrees of freedom of a black hole. A n…
Electroweak corrections to decays involving a charged Higgs boson
Andrzej Czarnecki
We present complete one-loop radiative corrections to the decay rate of a top quark into a charged Higgs boson and a bottom quark, and for the decay of a charged Higgs boson into l…
Faraday lines and observables for the Einstein-Maxwell theory
Viqar Husain
In recent work on Einstein gravity in four dimensions using the Ashtekar variables, non-local loop variables have played an important role in attempts to formulate a quantum theory…
Information in Black Hole Radiation
Don N. Page
If black hole formation and evaporation can be described by an matrix, information would be expected to come out in black hole radiation. An estimate shows that it may come out…
A Bjorken sum rule for semileptonic decays to ground and excited charmed baryon states
Q. P. Xu
We derive a Bjorken sum rule for semileptonic decays to ground and low-lying negative-parity excited charmed baryon states, in the heavy quark limit. We discuss the restricti…
Two dimensional general covariance from three dimensions
Viqar Husain
A 3d generally covariant field theory having some unusual properties is described. The theory has a degenerate 3-metric which effectively makes it a 2d field theory in disguise. Fo…
Black Hole Information
Don N. Page
Hawking's 1974 calculation of thermal emission from a classical black hole led to his 1976 proposal that information may be lost from our universe as a pure quantum state collapses…
Average Entropy of a Subsystem
Don N. Page
If a quantum system of Hilbert space dimension is in a random pure state, the average entropy of a subsystem of dimension is conjectured to be $S_{m,n}=\sum_{k=n+1}^…
Generalizations of the thermal Bogoliubov transformation
P. Elmfors, H. Umezawa
The thermal Bogoliubov transformation in thermo field dynamics is generalized in two respects. First, a generalization of the --degree of freedom to tilde non--conserving repres…
No Time Asymmetry from Quantum Mechanics
Don N. Page
With CPT-invariant initial conditions that commute with CPT-invariant final conditions, the respective probabilities (when defined) of a set of histories and its CPT reverse are eq…
Diagonalization of full finite temperature Green's function by quasi-particles
P. A. Henning, H. Umezawa
For thermal systems, standard perturbation theory breaks down because of the absence of stable, observable asymptotic states. We show, how the introduction of {\it statistical} qua…
The Delta-Hole model at Finite Temperature
P. A. Henning, H. Umezawa
The spectral function of pions interacting with a gas of nucleons and Delta-33-resonances is investigated using the formalism of Thermo Field Dynamics. After a discussion of the ze…
General covariance, loops and matter
Viqar Husain
A four dimensional generally covariant field theory is presented which describes non-dynamical three geometries coupled to scalar fields. The theory has an infinite number of physi…
Exact Primordial Black Strings in Four Dimensions
Nemanja Kaloper
A solution of effective string theory in four dimensions is presented which admits interpretation of a rotating black cosmic string. It is constructed by tensoring the three dimens…
Miens of The Three Dimensional Black Hole
N. Kaloper
Some aspects of the rotating three-dimensional Einstein-Anti-de-Sitter black hole solution, constructed recently by Banados, Teitelboim and Zanelli are discussed. It is shown expli…
Toponium Tests Of Top-Quark Higgs Bags
Alick L. Macpherson, Bruce A. Campbell
Recently it has been suggested that top quarks, or very massive fourth generation quarks, might surround themselves with a Higgs "bag" of deformation of the Higgs expectation value…