5,309 research outputs found
Monkeypox in South Africa: The need for responsible messaging to avoid stigmatising the LGBTI community
Partial supersymmetry breaking and gravity deformed chiral rings
We present a derivation of the chiral ring relations, arising in
gauge theories in the presence of (anti-)self-dual background gravitational
field and graviphoton field strength .
These were previously considered in the literature in order to prove the
relation between gravitational F-terms in the gauge theory and coefficients of
the topological expansion of the related matrix integral. We consider the
spontaneous breaking of to supergravity coupled to
vector- and hyper-multiplets, and take a rigid limit which keeps a non-trivial
and with a finite supersymmetry
breaking scale. We derive the resulting effective, global, theory
and show that the chiral ring relations are just a consequence of the standard
supergravity Bianchi identities . We can also obtain models with
matter in different representations and in particular quiver theories. We also
show that, in the presence of non-trivial , consistency of the
Konishi-anomaly loop equations with the chiral ring relations, demands that the
gauge kinetic function and the superpotential, a priori unrelated for an theory, should be derived from a prepotential, indicating an underlying
structure.Comment: 42 pages, uses JHEP.cls;v2: typos corrected and references adde
Exactly stable non-BPS spinors in heterotic string theory on tori
Considering SO(32) heterotic string theory compactified on a torus of
dimension 4 and less, stability of non-supersymmetric states is studied. A
non-supersymmetric state with robust stability is constructed, and its exact
stability is proven in a large region of moduli space against all the possible
decay mechanisms allowed by charge conservation. Using various T-duality
transform matrices, we translate various selection rules about conserved
charges into simpler problems resembling partition and parity of integers. For
heterotic string on T^4, we give a complete list of BPS atoms with elementary
excitations, and we study BPS and non-BPS molecules with various binding
energies. Using string-string duality, the results are interpreted in terms of
Dirichlet-branes in type IIA string theory compactified on an orbifold limit of
a K3 surface.Comment: 47 pages, 14 figures, LaTe
Duality in Non-Trivially Compactified Heterotic Strings
We study the implications of duality symmetry on the analyticity properties
of the partition function as it depends upon the compactification length. In
order to obtain non-trivial compactifications, we give a physical prescription
to get the Helmholtz free energy for any heterotic string supersymmetric or
not. After proving that the free energy is always invariant under the duality
transformation and getting the zero temperature
theory whose partition function corresponds to the Helmholtz potential, we show
that the self-dual point is a generic singularity
as the Hagedorn one. The main difference between these two critical
compactification radii is that the term producing the singularity at the
self-dual point is finite for any . We see that this behavior at
actually implies a loss of degrees of freedom below that point.Comment: (Preprint No. FTUAM-92/12) 17 page
Asymmetric Orbifolds, Non-Geometric Fluxes and Non-Commutativity in Closed String Theory
In this paper we consider a class of exactly solvable closed string flux
backgrounds that exhibit non-commutativity in the closed string coordinates.
They are realized in terms of freely-acting asymmetric Z_N-orbifolds, which are
themselves close relatives of twisted torus fibrations with elliptic
Z_N-monodromy (elliptic T-folds). We explicitly construct the modular invariant
partition function of the models and derive the non-commutative algebra in the
string coordinates, which is exact to all orders in {\alpha}'. Finally, we
relate these asymmetric orbifold spaces to inherently stringy Scherk-Schwarz
backgrounds and non-geometric fluxes.Comment: 30 page
Konishi anomaly approach to gravitational F-terms
We study gravitational corrections to the effective superpotential in
theories with a single adjoint chiral multiplet, using the generalized Konishi
anomaly and the gravitationally deformed chiral ring. We show that the genus
one correction to the loop equation in the corresponding matrix model agrees
with the gravitational corrected anomaly equations in the gauge theory. An
important ingrediant in the proof is the lack of factorization of chiral gauge
invariant operators in presence of a supergravity background. We also find a
genus zero gravitational correction to the superpotential, which can be removed
by a field redefinition.Comment: 28 pages, uses JHEP3.cl
Oceanographic parameters and their relationship to fish catch estimation: a case study in coastal waters north of Cochin during 1981
Coastal waters in the North of Cochin was selected for the present study. This area is well known for the occurrence
and abundance of fish schools of oil sardine (Sardinella Iongiceps) and mackerel (Rastrelliger Kanagurta) allowing the period after SW monsoon in the Indian Ocea
Remote sensing of ocean colour and targeting of fish schools from airborne sensors
Studying the well known pelagic school of oil sardine and mackerel in the Arabian sea of the Indian Ocean. A high productivity is reported in the oceanic waters of Cochin preceding SW monsoon. A remote sensing experiment was carried out in the oceanic waters over North of Cochin coast involving vessel-based sea truth data collection synchronous to aircraft overflights during October, November and December 1981
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