119489587
Fermion representation of the rolling tachyon boundary conformal field theory
A free fermion representation of the rolling tachyon boundary conformal field theory is constructed. The representation is used to obtain an explicit, compact, exact expression for the boundary state. We use the boundary state to compute the disc and cylinder amplitudes for the half-S-brane.
18394193
Topological Ward identity and anti-de Sitter space / CFT correspondence
Abstract The dual relationship between the supergravity in the anti-de Sitter (AdS) space and the superconformal field theory is discussed in the simplest form. We show that a topological Ward identity holds in the three dimensional Chern–Simons gravity. In this simple case the proposed dual relationship can be understood as the topological Ward identity. Extensions to the supersymmetric theories and higher dimensional ones are also briefly discussed.
123683308
STRING THEORY AND DUALITIES IN THE QUANTUM DISSIPATIVE HOFSTADTER SYSTEM
We study the dualities of the quantum dissipative Hofstadter system which describes particles moving in two dimensions, subject to a uniform magnetic field, a periodic potential and a dissipative force. Using the string theory formulation, we show that the system has two kinds of dualities. The duality, previously known as the exact duality in the literature is shown to correspond to a subgroup of the T-dual symmetry group unbroken by the periodic boundary potential in string theory. The other duality is a particle–kink duality in the noncommutative open string theory which is a generalized Schmid duality in the presence of the uniform magnetic field. The kinks of the dissipative Hofstadter model are found to be noncommutative objects. The particle–kink duality, which is called previously the approximate duality, is shown to be also exact. In contrast to the previous derivation, which is based on the Coulomb gas expansion of the partition function and asserts that the duality holds only approximately in t...
37673623
Apparatus-dependent contributions to g-2?
The University of Washington g-2 experiments have progressed to the marvelous precision of 10/sup 12/ in their measurement of the magnetic moment of the electron. A further improvement of a factor of 10 should occur in the near future. Concomitant with this accuracy is the necessity of understanding small corrections. These experiments employ a Penning trap whose electrodes behave as conducting walls for a microwave cavity. We investigate the effect of this cavity on the spin and cyclotron frequencies. Previous work, employing calculations that are not gauge invariant, implies that the present level of accuracy cannot be exceeded because of cavity effects on the spin precession frequency. In contrast to this erroneous work, we find no significant correction to the spin precession frequency, but we do find that the correction to the cyclotron frequency will be important when the experiments improve by another order of magnitude. 9 references.
6225872
Statistical mechanics of non-Abelian Chern-Simons particles.
We discuss the statistical mechanics of a two-dimensional gas of non-Abelian Chern-Simons particles which obey the non-Abelian braid statistics. The second virial coefficient is evaluated in the framework of the non-Abelian Chern-Simons quantum mechanics.
117114158
Relativistic Anyon and (2+1) Dimensional Gravity
17933439
Nonperturbative effects from the resummation of perturbation theory
Using the general argument in Borel resummation of perturbation theory that links the divergent perturbation theory to the nonperturbative effect we argue that the nonperturbative effect associated with the perturbation theory should have a branch cut only along the positive real axis in the complex coupling plane. The component in the weak coupling expansion of the nonperturbative amplitude, which usually includes the leading term in the weak coupling expansion, that gives rise to the branch cut can be calculated in principle from the perturbation theory combined with some exactly calculable properties of the nonperturbative effect. The realization of this mechanism is demonstrated in the double well potential and the two-dimensional O(N) nonlinear sigma model. In these models the leading term in weak coupling of the nonperturbative effect can be obtained with good accuracy from the first terms of the perturbation theory. Applying this mechanism to the infrared renormalon induced nonperturbative effect in QCD, we suggest some of the QCD condensate effects can be calculated in principle from the perturbation theory.
117208394
Scalar Nonluminous Matter in Galaxies
As a candidate for dark matter in galaxies, we study an SU(3) triplet of complex scalar fields which are nonminimally coupled to gravity. In the spherically symmetric static space–time where the flat rotational velocity curves of stars in galaxies can be explained, we find simple solutions of scalar fields with SU(3) global symmetry broken to U(1) × U(1), in an exponential scalar potential, which will be useful in a quintessence model of the late-time acceleration of the universe.
118715383
Global monopole asymptotic solutions in Horava gravity
In Hořava's theory of gravity coupled to a global monopole source, we seek for static, spherically symmetric spacetime, solutions for general values of λ. We obtain the explicit solutions with deficit solid angles, in the IR modified Hořava gravity model, at the IR fixed point λ = 1 and at the conformal point λ = 1/3. For the other values of 1 > λ > 0 we also find special solutions to the inhomogenous equation of the gravity model with detailed balance, and we discuss a possibility of astrophysical applications of the λ = 1/2 solution that has a deficit angle for a finite range.
27595321
Chiral radiative corrections and the Ds(2317)/D(2308) mass puzzle
We show that the one-loop chiral corrections for heavy light mesons in the potential model can explain the small mass of Ds(2317) as well as the small mass gap between Ds(2317) and D(2308).
121048591
Some power-law cosmological solutions derived from the 5D Brans-Dicke vacuum theory
We solve vacuum field equations in five-dimensional Brans–Dicke gravity to find power-law growth for the cosmological scale factor, with the range of its parameter values extended by the Brans–Dicke field. We discuss its implications for the onset of late-time cosmic acceleration.