1,422 research outputs found
Manifest superconformal covariance in six-dimensional (2,0) theory
A superconformal generalization of Dirac's formalism for manifest conformal
covariance is presented and applied to the free (2,0) tensor multiplet field
theory in six dimensions. A graded symmetric superfield, defined on a supercone
in a higher-dimensional superspace is introduced. This superfield transforms
linearly under the transformations of the supergroup OSp(8*|4), which is the
superconformal group of the six-dimensional (2,0) theory. We find the
relationship between the new superfield and the conventional (2,0) superfields
in six dimensions and show that the implied superconformal transformation laws
are correct. Finally, we present a manifestly conformally covariant constraint
on the supercone, which reduces to the ordinary differential constraint for the
superfields in the six-dimensional space-time.Comment: 12 pages, LaTeX. v2: minor clarification adde
Classical self-dual strings in d=6, (2,0) theory from afar
We show how one can get solitonic strings in a six-dimensional (2,0)
supersymmetric theory by incorporating a nonlinear interaction term. We derive
a zero force condition between parallel strings, and compute a metric on a
moduli space which is when the strings are far apart. When compactifying
the strings on a two-torus we show that, in the limit of vanishing two-torus,
one regains the moduli space of two widely separated dyons of equal magnetic
charges in four dimensions.Comment: 13 pages, clarifications and added reference
Thomson scattering of chiral tensors and scalars against a self-dual string
We give a non-technical outline of a program to study the (2,0) theories in
six space-time dimensions. Away from the origin of their moduli space, these
theories describe the interactions of tensor multiplets and self-dual spinning
strings. We argue that if the ratio between the square of the energy of a
process and the string tension is taken to be small, it should be possible to
study the dynamics of such a system perturbatively in this parameter. As a
first step in this direction, we perform a classical computation of the
amplitude for scattering chiral tensor and scalar fields (i.e. the bosonic part
of a tensor multiplet) against a self-dual spinnless string.Comment: 24 pages, LaTeX, 2 figures. v2: added discussion on supersymmetry in
Ch.
The enormous outer Galaxy HII region CTB 102
We present new radio recombination line observations of the previously
unstudied HII region CTB 102. Line parameters are extracted and physical
parameters describing the gas are calculated. We estimate the distance to CTB
102 to be 4.3 kpc. Through comparisons with HI and 1.42 GHz radio continuum
data, we estimate the size of CTB 102 to be 100-130 pc, making it one of the
largest HII regions known, comparable to the W4 complex. A stellar wind blown
bubble model is presented as the best explanation for the observed morphology,
size and velocities.Comment: 26 pages, 8 figures. Accepted for publication by The Astrophysical
Journa
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