30,908 research outputs found
Phase transitions in Ising model on a Euclidean network
A one dimensional network on which there are long range bonds at lattice
distances with the probability has been taken
under consideration. We investigate the critical behavior of the Ising model on
such a network where spins interact with these extra neighbours apart from
their nearest neighbours for . It is observed that there is
a finite temperature phase transition in the entire range. For , finite size scaling behaviour of various quantities are consistent with
mean field exponents while for , the exponents depend on
. The results are discussed in the context of earlier observations on
the topology of the underlying network.Comment: 7 pages, revtex4, 7 figures; to appear in Physical Review E, minor
changes mad
BTZ Black Hole with Chern-Simons and Higher Derivative Terms
The entropy of a BTZ black hole in the presence of gravitational Chern-Simons
terms has previously been analyzed using Euclidean action formalism. In this
paper we treat the BTZ solution as a two dimensional black hole by regarding
the angular coordinate as a compact direction, and use Wald's Noether charge
method to calculate the entropy of this black hole in the presence of higher
derivative and gravitational Chern-Simons terms. The parameters labelling the
black hole solution can be determined by extremizing an entropy function whose
value at the extremum gives the entropy of the black hole.Comment: LaTeX file, 11 page
Comparative study of spanning cluster distributions in different dimensions
The probability distributions of the masses of the clusters spanning from top
to bottom of a percolating lattice at the percolation threshold are obtained in
all dimensions from two to five. The first two cumulants and the exponents for
the universal scaling functions are shown to have simple power law variations
with the dimensionality. The cases where multiple spanning clusters occur are
discussed separately and compared.Comment: 8 pages, latex, 4 eps figures included, to appear in Int. Journal of
Modern Physics
Remark about Non-BPS D-Brane in Type IIA Theory
In this paper we would like to show simple mechanisms how from the action for
non-BPS D-brane we can obtain action describing BPS D(p-1)-brane in Type IIA
theory.Comment: 13 pages, completely rewritten pape
The Double Dividend Hypothesis and Trade Liberalization
This paper studies how simultaneously liberalizing trade and tightening environmental policy affect welfare in a second-best world. We consider a three-good two-factor small open economy. We allow for non-tradables and for market power in the export market. The government is constrained to balance its budget at all times through distortionary taxes: a given income transfer has to be financed out of tariff and pollution tax revenue. We show that the switch from trade tariffs to environmental taxes can yield an increase in real income thus providing a second dividend in addition to the environmental improvement.environmental policy;trade liberalization;double dividend;non-tradables
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