1,888 research outputs found
Mirror Maps and Instanton Sums for Complete Intersections in Weighted Projective Space
We consider a class of Calabi-Yau compactifications which are constructed as
a complete intersection in weighted projective space. For manifolds with one
K\"ahler modulus we construct the mirror manifolds and calculate the instanton
sum.Comment: 10 page
Chern-Simons Gravity and Holographic Anomalies
We present a holographic treatment of Chern-Simons (CS) gravity theories in
odd dimensions. We construct the associated holographic stress tensor and
calculate the Weyl anomalies of the dual CFT.Comment: Added references, and minor corrections. 21 pages, havmac, no figure
Nonperturbative Effective Actions of N=2 Supersymmetric Gauge Theories
We elaborate on our previous work on N=2 supersymmetric Yang-Mills theory. In
particular, we show how to explicitly determine the low energy quantum
effective action for from the underlying hyperelliptic Riemann
surface, and calculate the leading instanton corrections. This is done by
solving Picard-Fuchs equations and asymptotically evaluating period integrals.
We find that the dynamics of the theory is governed by an Appell system
of type , and compute the exact quantum gauge coupling explicitly in terms
of Appell functions.Comment: 57p, harvmac with hyperlinks, 9 uuencoded ps figure
Lectures on Mirror Symmetry
We give an introduction to mirror symmetry of strings on Calabi-Yau manifolds
with an emphasis on its applications e.g. for the computation of Yukawa
couplings. We introduce all necessary concepts and tools such as the basics of
toric geometry, resolution of singularities, construction of mirror pairs,
Picard-Fuchs equations, etc. and illustrate all of this on a non-trivial
example. Extended version of a lecture given at the Third Baltic Student
Seminar, Helsinki September 1993Comment: LMU-TPW-94-02, 45 pages, harvma
Tachyon condensation and universality of DBI action
We show that a low-energy action for massless fluctuations around a tachyonic
soliton background representing a codimension one D-brane coincides with the
Dirac-Born-Infeld action. The scalar modes which describe transverse
oscillations of the D-brane are translational collective coordinates of the
soliton. The appearance of the DBI action is a universal feature independent of
details of a tachyon effective action, provided it has the structure implied by
the open string sigma model partition function.Comment: LaTex, 15 p. v2: references adde
On the Monodromies of N=2 Supersymmetric Yang-Mills Theory
We review the generalization of the work of Seiberg and Witten on N=2
supersymmetric SU(2) Yang-Mills theory to SU(n) gauge groups. The quantum
moduli spaces of the effective low energy theory parametrize a special family
of hyperelliptic genus n-1 Riemann surfaces. We discuss the massless spectrum
and the monodromies.Comment: 15p, harvmac/lanlmac with hyperlinks, 4 uuencoded compressed
postscript figures appende
Mirror Symmetry, Mirror Map and Applications to Complete Intersection Calabi-Yau Spaces
We extend the discussion of mirror symmetry, Picard-Fuchs equations,
instanton-corrected Yukawa couplings, and the topological one-loop partition
function to the case of complete intersections with higher-dimensional moduli
spaces. We will develop a new method of obtaining the instanton-corrected
Yukawa couplings through a close study of the solutions of the Picard-Fuchs
equations. This leads to closed formulas for the prepotential for the K\"ahler
moduli fields induced from the ambient space for all complete intersections in
non singular weighted projective spaces. As examples we treat part of the
moduli space of the phenomenologically interesting three-generation models that
are found in this class. We also apply our method to solve the simplest model
in which a topology change was observed and discuss examples of complete
intersections in singular ambient spaces.Comment: 50 page
On the M-Theory Approach to (Compactified) 5D Field Theories
We construct M-theory curves associated with brane configurations of SU(N),
SO(N) and 5d supersymmetric gauge theories compactified on a circle.
From the curves we can account for all the existing different SU(N) field
theories with . This is the correct bound for . We
remark on the exceptional case SU(2). The bounds obtained for SO(N) and
are and , respectively.Comment: 18 pages, minor correction
Manejo de plantas daninhas na produção de arroz orgùnico.
bitstream/item/78976/1/documento-304.pd
Stepping through the Thin, Crackly Crust of the Present: Historians, Biographers, Novelists and Jack Burden
From the back of my copy of All the King\u27s Men I learned that Willie Stark is an important part of our collective literary consciousness, and that he is as memorable as Holden Caulfield or Huck Finn. This statement is both interesting and suspect, because Willie Stark is neither the focus of the novel nor its most compelling character. Apparently, though, charismatic politicians are infinitely more engaging than well-spoken, introspective, and witty writers - at least to some of Robert Penn Warren\u27s peers. Despite Jack Burden\u27s position as the protagonist in the novel, any simple plot summary of All the King\u27s Men will focus upon Willie Stark\u27s career and demise. Willie resonates with readers: he is not so specific as to preclude our memories of real politicians (particularly Huey P. Long, upon whom he is based), yet not so vague as to blend into the communal lull of characters we\u27ve encountered. So while Burden may be our narrator and interpreter, the focus of his attention is Willie, forcing the politician to the foreground. We follow Jack\u27s gaze - sometimes home to his mother, sometimes back in time to his adolescence, but always toward the capital and Willie - and can only view history through him. The novel is, then, almost a fictional memoir by Huey P. Long\u27s assistant, as it contains information about his boss, his job, and his personal life. The most compelling moments of the novel emerge when these three intersect, and when Jack attempts to interpret their implications. History is made through such attempts, and even if Jack is a fictional character, his insights ring clear in our world as well as his
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