2,547 research outputs found
D3-branes dynamics and black holes
Using the D3-brane as the fundamental tool, we adress two aspects of D-branes
physics. The first regards the interaction between two electromagnetic dual
D-branes in 10 dimensions. In particular, we give a meaning to {\it both} even
and odd spin structure contributions, the latter being non vanishing for non
zero relative velocity (and encoding the Lorentz-like contribution). The
second aspect regards the D-brane/black holes correspondence. We show how the 4
dimensional configuration corresponding to a {\it single} D3-brane wrapped on
the orbifold T^6/Z_3 represents a regular Reissner-Nordstrom solution of d=4
N=2 supergravityComment: 8 pages, latex, 1 eps figure. Talk presented by M. Bertolini at the
conference "Quantum aspects of gauge theories, supergravity and unification"
in Corfu`; to appear in the proceeding
Accidents in (0,2) Landau-Ginzburg theories
We study the role of accidental symmetries in two-dimensional (0,2)
superconformal field theories obtained by RG flow from (0,2) Landau-Ginzburg
theories. These accidental symmetries are ubiquitous, and, unlike in the case
of (2,2) theories, their identification is key to correctly identifying the IR
fixed point and its properties. We develop a number of tools that help to
identify such accidental symmetries in the context of (0,2) Landau-Ginzburg
models and provide a conjecture for a toric structure of the SCFT moduli space
in a large class of models. We also give a self-contained discussion of aspects
of (0,2) conformal perturbation theory.Comment: 37 pages; expanded conformal perturbation theory discussion in v2;
fixed an accident in section 3.5 in v
Supersymmetric predictions for the inclusive decay
We study the penguin induced transition in the minimal N=1
supersymmetric extension of the Standard Model with radiative breaking of the
electroweak group. We include the effects of one-loop corrections to the Higgs
potential and scalar masses. We show that the present upper and lower
experimental limits on the inclusive decay sharply constrain the parameter
space of the model in a wide range of values. The implications of
the recently advocated relation for the bilinear SUSY soft breaking
parameter in grand unified theories are also analyzed.Comment: 23 pages + 12 figures (hardcopies available on request), LATEX, SISSA
40/94/E
Poverty and Social Exclusion in Rural Areas. Final Study Report
This study aims at analysing the main and specific features of poverty and social exclusion in rural areas; on the policy side, it analyses those policies, implemented by local, national or EU authorities, that have an impact on rural poverty. After identifying rural areas in the EU and the European Economic Area (EEA),the study concentrates on fifteen countries for the description of the main features of poverty in rural areas. The fifteen countries are selected in order to present a balanced sample of different
geographical regions (Northern, Southern, Western and Eastern Europe) and social models.
one EEA country – Norway
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