273,986 research outputs found
Constraints on Anomalous Fluid in Arbitrary Dimensions
Using the techniques developed in arxiv: 1203.3544 we compute the universal
part of the equilibrium partition function characteristic of a theory with
multiple abelian U(1) anomalies in arbitrary even spacetime dimensions. This
contribution is closely linked to the universal anomaly induced transport
coefficients in hydrodynamics which have been studied before using entropy
techniques. Equilibrium partition function provides an alternate and a
microscopically more transparent way to derive the constraints on these
transport coefficients. We re-derive this way all the known results on these
transport coefficients including their polynomial structure which has recently
been conjectured to be linked to the anomaly polynomial of the theory. Further
we link the local description of anomaly induced transport in terms of a Gibbs
current to the more global description in terms of the partition function
The partition algebra and the plethysm coefficients
We propose a new approach to study plethysm coefficients by using the
Schur-Weyl duality between the symmetric group and the partition algebra. This
allows us to explain the stability properties of plethysm and Kronecker
coefficients in a simple and uniform fashion for the first time. We prove the
strengthened Foulkes' conjecture for stable plethysm coefficients in an
elementary fashion
Second order transport from anomalies
We study parity odd transport at second order in derivative expansion for a
non-conformal charged fluid. We see that there are 27 parity odd transport
coefficients, of which 12 are non-vanishing in equilibrium. We use the
equilibrium partition function method to express 7 of these in terms of the
anomaly, shear viscosity, charge diffusivity and thermodynamic functions. The
remaining 5 are constrained by 3 relations which also involve the anomaly. We
derive Kubo formulae for 2 of the transport coefficients and show these agree
with that derived from the equilibrium partition function.Comment: Error in total number of independent parity odd transport
coefficients has been corrected from 29 to 27. Results for the relation of
the transport coefficients to the anomaly unchanged. Added a section on
chiral dispersion relations, includes additional references. Added two
appendices and corrected some typos. 34 page
On the holomorphic factorization for superconformal fields
For a generic value of the central charge, we prove the holomorphic
factorization of partition functions for free superconformal fields which are
defined on a compact Riemann surface without boundary. The partition functions
are viewed as functionals of the Beltrami coefficients and their fermionic
partners which variables parametrize superconformal classes of metrics.Comment: 5 pages, LATEX, MPI-Ph/92-7
Superfluid Kubo Formulas from Partition Function
Linear response theory relates hydrodynamic transport coefficients to
equilibrium retarded correlation functions of the stress-energy tensor and
global symmetry currents in terms of Kubo formulas. Some of these transport
coefficients are non-dissipative and affect the fluid dynamics at equilibrium.
We present an algebraic framework for deriving Kubo formulas for such thermal
transport coefficients by using the equilibrium partition function. We use the
framework to derive Kubo formulas for all such transport coefficients of
superfluids, as well as to rederive Kubo formulas for various normal fluid
systems.Comment: 41 pages, 4 appendixe
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