13,250 research outputs found
Space-times produced by a time-dependent scalar field
Models of Lorentz/diffeomorphism violation frequently make use of a
time-dependent scalar field. We investigate space-times produced by such a
field.Comment: Presented at PASCOS Meeting 200
Conformal Blocks for the 4-Point Function in Conformal Quantum Mechanics
Extending previous work on 2 -- and 3 -- point functions, we study the 4 --
point function and its conformal block structure in conformal quantum mechanics
CFT, which realizes the SO(2,1) symmetry group. Conformal covariance is
preserved even though the operators with which we work need not be primary and
the states are not conformally invariant. We find that only one conformal block
contributes to the four-point function. We describe some further properties of
the states that we use and we construct dynamical evolution generated by the
compact generator of SO(2.1).Comment: Formula for 4-point function is corrected and generalize
State Space for Planar Majorana Zero Modes
Zero modes arising from a planar Majorana equation in the presence of
vortices require an -dimensional state-space, where for even and for odd. The mode
operators form a restricted -dimensional Clifford algebra.Comment: 6 pages, no figure
Reducing the Chern-Simons term by a symmetry
Reducing a 3-dimensional Chern-Simons term by a symmetry yields other
topologically interesting structures. Specifically, reducing by radial symmetry
results in a 1-dimensional quantum mechanical model, which has recently been
used in an analysis of finite-temperature Chern-Simons theory. The radially
symmetric expression may be inserted into 3-dimensional monopole or
(2+1)-dimensional instanton equations, where it eliminates the monopole or
instanton solutions.Comment: Email correspondence to [email protected] ; 7 pages, REVTe
Persistence of zero modes in a gauged Dirac model for bilayer graphene
A recently constructed model for low lying excitations in bilayer graphene
exhibits mid-gap, zero energy modes in its Dirac-like spectrum, when a scalar
order parameter takes a vortex profile. We show that these modes persist when
the dynamics is extended by a gauge field interaction, which also renders
finite the vortex energy. The effect of the gauge field on the zero energy wave
function is to shift the phase of the (damped) oscillatory component of the
wave function in the absence of the gauge field.Comment: 7 pages, no figure
Cotton Blend Gravity Waves
We study conformal gravity in d=2+1, where the Cotton tensor is equated to
a--necessarily traceless--matter stress tensor, for us that of the improved
scalar field. We first solve this system exactly in the wave regime, then
show it to be equivalent to topologically massive gravity.Comment: 6 pages. Dedicated to Andrzej Staruszkiewicz, a pioneer in d=3
gravity, on his 65th birthda
Self-consistent Improvement of the Finite Temperature Effective Potential
We present a self-consistent calculation of the finite temperature effective
potential for theory, using the composite operator effective
potential in which an infinite series of the leading diagrams is summed up. Our
calculation establishes the proper form of the leading correction to the
perturbative one-loop effective potential.Comment: 19 pages, Plain Tex, (References completely reorganized and
corresponding changes in the text. Also minor typo corrections. 4 figures
still not included.
Investigation of Northrop F-5A wing buffet intensity in transonic flight
A flight test and data processing program utilizing a Northrop F-5A aircraft instrumented to acquire buffet pressures and response data during transonic maneuvers is discussed. The data are presented in real-time format followed by spectral and statistical analyses. Also covered is a comparison of the aircraft response data with computed responses based on the measured buffet pressures
Evaluation of three analytical methods for structures under random acoustic excitation
Evaluation of three methods for determining response analysis of plate and shell structures under random acoustic excitatio
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