5,724 research outputs found
Stochastic Quantization of Topological Field Theory: Generalized Langevin Equation with Memory Kernel
We use the method of stochastic quantization in a topological field theory
defined in an Euclidean space, assuming a Langevin equation with a memory
kernel. We show that our procedure for the Abelian Chern-Simons theory
converges regardless of the nature of the Chern-Simons coefficient
New Global Defect Structures
We investigate the presence of defects in systems described by real scalar
field in (D,1) spacetime dimensions. We show that when the potential assumes
specific form, there are models which support stable global defects for D
arbitrary. We also show how to find first-order differential equations that
solve the equations of motion, and how to solve models in D dimensions via
soluble problems in D=1. We illustrate the procedure examining specific models
and finding explicit solutions.Comment: RevTex4, 4 pages, 3 eps figures; to be published in Phys. Rev. Let
Fungos associados as sementes botanicas de mandioquinha-salsa provenientes do Parana.
bitstream/item/109214/1/Fungos-associados-as-sementes-botanicas-de-mandioquinha-salsa-provenientes-do-Parana.pd
The importance of the mixed phase in hybrid stars built with the Nambu-Jona-Lasinio model
We investigate the structure of hybrid stars based on two different
constructions: one is based on the Gibbs condition for phase coexistence and
considers the existence of a mixed phase (MP), and the other is based on the
Maxwell construction and no mixed phase is obtained. The hadron phase is
described by the non-linear Walecka model (NLW) and the quark phase by the
Nambu-Jona-Lasinio model (NJL). We conclude that the masses and radii obtained
are model dependent but not significantly different for both constructions.Comment: 8 pages, 7 figures, 3 table
Efficient algorithms for pairing-based cryptosystems
We describe fast new algorithms to implement recent cryptosystems based on the Tate pairing. In particular, our techniques improve pairing evaluation speed by a factor of about 55 compared to previously known methods in characteristic 3, and attain performance comparable
to that of RSA in larger characteristics.We also propose faster algorithms for scalar multiplication in characteristic 3 and square root extraction
over Fpm, the latter technique being also useful in contexts other than that of pairing-based cryptography
Why do Hurst exponents of traded value increase as the logarithm of company size?
The common assumption of universal behavior in stock market data can
sometimes lead to false conclusions. In statistical physics, the Hurst
exponents characterizing long-range correlations are often closely related to
universal exponents. We show, that in the case of time series of the traded
value, these Hurst exponents increase logarithmically with company size, and
thus are non-universal. Moreover, the average transaction size shows scaling
with the mean transaction frequency for large enough companies. We present a
phenomenological scaling framework that properly accounts for such
dependencies.Comment: 10 pages, 4 figures, to appear in the Proceedings of the
International Workshop on Econophysics of Stock Markets and Minority Games,
Calcutta, 200
Failure regime in (1+1) dimensions in fibrous materials
In this paper, we introduce a model for fracture in fibrous materials that
takes into account the rupture height of the fibers, in contrast with previous
models. Thus, we obtain the profile of the fracture and calculate its
roughness, defined as the variance around the mean height. We investigate the
relationship between the fracture roughness and the fracture toughness.Comment: 4 pages, 4 figures.eps, Revte
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