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18 papers · 1 filter
from Superstrings
Nobuyoshi Ohta, Jens Lyng Petersen
We give a simple proof that a particular class of superstrings are equivalent to the superstrings. This is achieved by constructing a similarity transformation which tr…
Multiband tight--binding approach to tunneling in semiconductor heterostructures: Application to transfer in GaAs
J. A. Støvneng, P. Lipavský
We study tunneling in semiconductor heterostructures where the constituent materials can have a direct or indirect bandgap. In order to have a good description of the lowest conduc…
Glueball Spectra of SU(2) Gauge Theories in 3 and 4 Dimensions: A Comparison with the Isgur-Paton Flux Tube Model
T. Moretto, M. Teper
We use the results of recent lattice calculations to obtain (part of) the mass spectrum of continuum SU(2) gauge theory in both 2+1 and 3+1 dimensions. We compare these spectra to…
Neutrino Pair Bremsstrahlung in Neutron Star Crusts: a Reappraisal
C. J. Pethick, Vesteinn Thorsson
We demonstrate that band-structure effects suppress bremsstrahlung of neutrino pairs by electrons in the crusts of neutron stars at temperatures of the order of $5\times 10^9 \,{\r…
Negative Energy Densities in Extended Sources Generating Closed Timelike Curves in General Relativity with and without Torsion
Harald H. Soleng
Near a spinning point particle in (2+1)-dimensional gravity (or near an infinitely thin, straight, spinning string in 3+1 dimensions) there is a region of space-time with closed ti…
Anomalies, VMD and the Enjl Model
Johan Bijnens, Joaquim Prades
We show how the effective action of the Extended Nambu--Jona-Lasinio model (ENJL) can be defined in the presence of anomalies in a way that reproduces the flavour anomaly. This nec…