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On the mass spectrum of noncommutative Schwinger model in R^2 space
mass spectrum noncommutative Schwinger model
2010/12/24
The mass spectrum of the noncommutative QED in two-dimensional Euclidean R^2 space is derived first in a perturbative approach at one-loop level and then in a nonperturbative approach using the equiv...
Variational Approach to Yang--Mills Theory with non-Gaussian Wave Functionals
Yang--Mills Theory non-Gaussian Wave Functionals
2010/12/24
A general method for treating non-Gaussian wave functionals in quantum field theory is presented and applied to the Hamiltonian approach to Yang-Mills theory in Coulomb gauge in order to include a th...
We compute scattering amplitudes of leading Regge trajectory states in open superstring theories. Highest spin states at mass level n with spin s=n+1 for bosons and s=n+1/2 for fermions are generated ...
Fundamental String (Membrane) Orbiting D5(M5)-branes
Fundamental String Orbiting D5(M5)-branes
2010/12/23
We study fundamental string (F-string) dynamics near D5-brane in some limits. We find that when the angular momentum of the probe is proportional to string length (l_s) and square root of string coupl...
Lorentz-preserving fields in Lorentz-violating theories
Lorentz-preserving fields Lorentz-violating theories
2010/12/23
We identify a fairly general class of field configurations (of spins 0, 1/2 and 1) which preserve Lorentz invariance in effective field theories of Lorentz violation characterized by a constant timel...
I present some applications of geometric flows in string theory and gravity. In some circumstances time evolution in string theory can be approximately identified with Ricci-flow parametric evolution...
The Hamiltonian constraint in Polymer Parametrized Field Theory
The Hamiltonian constraint Polymer Parametrized Field Theory
2010/12/27
Recently, a generally covariant reformulation of 2 dimensional flat spacetime free scalar field theory known as Parameterised Field Theory was quantized using Loop Quantum Gravity (LQG) type `polymer...
Axial Symmetry, Anti-BRST Invariance and Modified Anomalies
Axial Symmetry Anti-BRST Invariance Modified Anomalies
2010/12/23
It is shown that anti-BRST symmetries are quantized counterparts of local axial symmetries in gauge theories. An extended form of descent equations is worked out which yields a set of modified consist...
Note on Bonus Relations for N=8 Supergravity Tree Amplitudes
Bonus Relations N=8 Supergravity Tree Amplitudes
2010/12/24
We study the application of non-trivial relations between gravity tree amplitudes, the bonus relations, to all tree-level amplitudes in N=8 supergravity. We show that the relations can be used to sim...
The gravitino problem in supersymmetric warm inflation
The gravitino problem supersymmetric warm inflation
2010/12/27
The warm inflation paradigm considers the continuous production of radiation during inflation due to dissipative effects. In its strong dissipation limit, warm inflation gives way to a radiation domin...
Quantum Aspects of Massive Gravity II: Non-Pauli-Fierz Theory
Massive Gravity II Non-Pauli-Fierz Theory
2010/12/24
We investigate the non-Pauli-Fierz (nPF) theory, a linearized massive gravity with a generic graviton mass term, which has been ignored due to a ghost in its spectrum and the resultant loss of unitari...
Matrix Model and Refined Wall-Crossing Formula
Matrix Model Refined Wall-Crossing Formula
2010/12/23
In this paper, we show how to get matrix models corresponding to the refined BPS states partition functions of $\mathbb{C}^3$, resolved conifold and $\mathbb{C}^3/\mathbb{Z}_2$ by inserting the ident...
Spherically Symmetric Approximation (and beyond) in Relativistic Schroedinger Theory
Spherically Symmetric Approximation Relativistic Schroedinger Theory
2010/12/23
The energy eigenvalue problem of non-relativistic positronium is considered within the framework of Relativistic Schroedinger Theory (RST), and the results are compared to those of the conventional qu...
Algebraic classification of spacetimes using discriminating scalar curvature invariants
Algebraic classification of spacetimes discriminating scalar curvature invariants
2010/12/27
The Weyl and Ricci tensors can be algebraically classified in a Lorentzian spacetime of arbitrary dimensions using alignment theory. Used in tandem with the boost weight decomposition and curvature op...
Consistency of isotropic modified Maxwell theory: Microcausality and unitarity
Maxwell theory Microcausality and unitarity
2010/12/24
The Lorentz-violating isotropic modified Maxwell theory minimally coupled to standard Dirac theory is characterized by a single real dimensionless parameter which is taken to vanish for the case of t...