7,201 research outputs found
Cohomological invariants of a variation of flat connection
In this paper, we apply the theory of Chern-Cheeger-Simons to construct
canonical invariants associated to a -simplex whose points parametrize flat
connections on a smooth manifold . These invariants lie in degrees
-cohomology with -coefficients, for . In turn, this
corresponds to a homomorphism on the higher homology groups of the moduli space
of flat connections, and taking values in -cohomology of the underlying
smooth manifold .Comment: 15 p. Final version, to appear. arXiv admin note: text overlap with
arXiv:1310.000
The Chern character of a parabolic bundle, and a parabolic Reznikov theorem in the case of finite order at infinity
In this paper, we obtain an explicit formula for the Chern character of a
locally abelian parabolic bundle in terms of its constituent bundles. Several
features and variants of parabolic structures are discussed. Parabolic bundles
arising from logarithmic connections form an important class of examples. As an
application, we consider the situation when the local monodromies are
semi-simple and are of finite order at infinity. In this case the parabolic
Chern classes of the associated locally abelian parabolic bundle are deduced to
be zero in the rational Deligne cohomology in degrees .Comment: Adds and corrects reference
Quantum differential operators on the quantum plane
The universal enveloping algebra U(g) of a Lie algebra g acts on its
representation ring R through D(R), the ring of differential operators on R. A
quantised universal enveloping algebra (or "quantum group") is a deformation of
a universal enveloping algebra and acts not through the differential operators
of its representation ring but through the quantised differential operators of
its representation ring. We present this situation for the quantum group of
sl_2.Comment: 18 pages, references added, address change
Determination of mass of IGR J17091-3624 from "Spectro-Temporal" variations during onset-phase of the 2011 outburst
The 2011 outburst of the black hole candidate IGR J17091-3624 followed the
canonical track of state transitions along with the evolution of Quasi-Periodic
Oscillation (QPO) frequencies before it began exhibiting various variability
classes similar to GRS 1915+105. We use this canonical evolution of spectral
and temporal properties to determine the mass of IGR J17091-3624, using three
different methods, viz : Photon Index () - QPO frequency ()
correlation, QPO frequency () - Time (day) evolution and broadband
spectral modelling based on Two Component Advective Flow. We provide a combined
mass estimate for the source using a Naive Bayes based joint likelihood
approach. This gives a probable mass range of 11.8 M - 13.7
M. Considering each individual estimate and taking the lowermost and
uppermost bounds among all three methods, we get a mass range of 8.7
M - 15.6 M with 90% confidence. We discuss the probable
implications of our findings in the context of two component accretion flow.Comment: 10 pages, 5 figures (4 in colour), 2 tables. Accepted for publication
in Ap
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