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125 papers · 1 filter
BPS Amplitudes, Helicity Supertraces and Membranes in M-Theory
Bernard de Wit, Dieter Lust
We study BPS dominated loop amplitudes in M-theory on T^2. For this purpose we generalize the concept of helicity supertraces to nine spacetime dimensions. These traces distinguish…
Gauge and gravitational anomalies in D=4 N=1 orientifolds
Claudio A. Scrucca, Marco Serone
The cancellation of U(1)-gauge and U(1)-gravitational anomalies in certain D=4 N=1 Type IIB orientifolds is analyzed in detail, from a string theory point of view. We verify the pr…
The Temperature and Cooling Age of the White-Dwarf Companion to the Millisecond Pulsar PSR B1855+09
M. H. van Kerkwijk, J. F. Bell, V. M. Kaspi +1
We report on Keck and {\em Hubble Space Telescope} observations of the binary millisecond pulsar PSR B1855+09. We detect its white-dwarf companion and measure $\mv=25.90\pm0.12$ an…
Stagnation and Infall of Dense Clumps in the Stellar Wind of tau Scorpii
J. Christopher Howk, Joseph Cassinelli, Jon Bjorkman +1
Observations of the B0.2V star tau Scorpii have revealed unusual stellar wind characteristics: red-shifted absorption in the far-ultraviolet O VI resonance doublet up to +250 km/s,…
Consistent histories and relativistic invariance in the modal interpretation of quantum mechanics
Dennis Dieks
Modal interpretations of quantum mechanics assign definite properties to physical systems and specify single-time joint probabilities of these properties. We show that a natural ex…
The radio source B 1834+620: A double-double radio galaxy with interesting properties
Arno P. Schoenmakers, A. G. de Bruyn, H. J. A. Rottgering +1
We present a study of the peculiar radio galaxy B 1834+620. It is characterised by the presence of a 420-kpc large edge-brightened radio source which is situated within, and well a…