15,305 research outputs found
Interacting staggered domain wall fermions
The behavior of staggered domain wall fermions in the presence of gauge
fields is presented. In particular, their response to gauge fields with
nontrivial topology is discussed.Comment: Lattice2002(Chiral) proceedings, LaTeX, 3 pages 2 eps figure
On the -algebra in the Calegero-Sutherland model using the Exchange operators
We study the algebra in the Calegero-Sutherland model using the
exchange operators. The presence of all the sub-algebras of is shown
in this model. A simplified proof for this algebra, in the symmetric ordered
basics, is given. It is pointed out that the algebra contains in general,
nonlinear terms. Possible connection to the nonlinear is discussed.Comment: Plain Tex, no figures, 13 page
Ginsparg-Wilson relation and the overlap formula
The fermionic determinant of a lattice Dirac operator that obeys the
Ginsparg-Wilson relation factorizes into two factors that are complex conjugate
of each other. Each factor is naturally associated with a single chiral fermion
and can be realized as a overlap of two many body vacua.Comment: 4 pages, plain tex, no figure
The hermitian Wilson-Dirac operator in smooth SU(2) instanton backgrounds
We study the spectral flow of the hermitian Wilson-Dirac operator \ham(m)
as a function of in smooth SU(2) instanton backgrounds on the lattice. For
a single instanton background with Dirichlet boundary conditions on \ham(m),
we find a level crossing in the spectral flow of \ham(m), and we find the
shape of the crossing mode at the crossing point to be in good agreement with
the zero mode associated with the single instanton background. With
anti-periodic boundary conditions on \ham(m), we find that the instanton
background in the singular gauge has the correct spectral flow but the one in
regular gauge does not. We also investigate the spectral flows of two instanton
and instanton-anti-instanton backgrounds.Comment: 18 pages, Latex file, 12 postscript figure
Evidence for fractional topological charge in SU(2) pure Yang-Mills theory
We investigate the spectral flows of the hermitian Wilson-Dirac operator in
the fundamental and adjoint representations on two ensembles of pure SU(2)
gauge field configurations at the same physical volume. We find several
background gauge field configurations where the index of the hermitian
Wilson-Dirac operator in the adjoint representation is not four times the index
in the fundamental representation. This could imply a topological basis for the
gluino condensate in supersymmetric Yang-Mills theories.Comment: 6 pages latex with 1 postscript figure included by eps
A new method to measure the chiral condensate in lattice QCD using Wilson fermions
Parity and flavor symmetry is not broken in QCD. Using this fact, we propose
a new method to measure the chiral condensate in lattice QCD using Wilson
fermions with an operator that breaks parity and flavor in addition to the
chiral symmetry.Comment: 9 pages, LaTeX, no figure
Exploring the Psychological Antecedents of Attitude towards Indigenous Wetland Practices
A study was conducted in the North eastern agro-climatic zone of Tamil Nadu, India to analyze the possible impact of the psychological antecedents of attitude towards Indigenous Wetland Practices(IWPs) among the farming community. Two hundred and nine farmers were selected at random from ten blocks in three districts of the state. Their psychological characteristics and attitude towards IWPs were assessed. The mean attitude score and the mean attitude index were analysed. The highest variable index was found in the case of Progressivism and Traditionalism, followed by Self-Reliance. Environmental orientation and Decision making ability had a positive and highly significant relationship while Scientific Orientation had a negative and highly significant relationship with attitude towards Indigenous Wetland Practices.
Dusty Star-Forming Galaxies at High Redshift
Far-infrared and submillimeter wavelength surveys have now established the
important role of dusty, star-forming galaxies (DSFGs) in the assembly of
stellar mass and the evolution of massive galaxies in the Universe. The
brightest of these galaxies have infrared luminosities in excess of 10
L with implied star-formation rates of thousands of solar masses per
year. They represent the most intense starbursts in the Universe, yet many are
completely optically obscured. Their easy detection at submm wavelengths is due
to dust heated by ultraviolet radiation of newly forming stars. When summed up,
all of the dusty, star-forming galaxies in the Universe produce an infrared
radiation field that has an equal energy density as the direct starlight
emission from all galaxies visible at ultraviolet and optical wavelengths. The
bulk of this infrared extragalactic background light emanates from galaxies as
diverse as gas-rich disks to mergers of intense starbursting galaxies. Major
advances in far-infrared instrumentation in recent years, both space-based and
ground-based, has led to the detection of nearly a million DSFGs, yet our
understanding of the underlying astrophysics that govern the start and end of
the dusty starburst phase is still in nascent stage. This review is aimed at
summarizing the current status of DSFG studies, focusing especially on the
detailed characterization of the best-understood subset (submillimeter
galaxies, who were summarized in the last review of this field over a decade
ago, Blain et al., 2002), but also the selection and characterization of more
recently discovered DSFG populations. We review DSFG population statistics,
their physical properties including dust, gas and stellar contents, their
environments, and current theoretical models related to the formation and
evolution of these galaxies.Comment: 154 pages, 49 figures; Invited review article accepted for
publication in Physics Report
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