45 research outputs found
The Partition Function for Topological Field Theories
We use a Hodge decomposition and its generalization to non-abelian flat
vector bundles to calculate the partition function for abelian and non- abelian
BF theories in dimensions. This enables us to provide a simple proof that
the partition function is related to the Ray-Singer torsion defined on flat
vector bundles for all odd-dimensional manifolds, and is equal to unity for
even dimensions.Comment: 23 pages, plain-TeX fil
Thermodynamics and Statistical Mechanics of Induced Liouville Gravity
In this paper we describe a Liouville gravity which is induced by a set of
quantum fields (constituents) and represents a two-dimensional analog of
Sakharov's induced gravity. The important feature of the considered theory is
the presence of massless constituents which are responsible for the appearance
of the induced Liouville field. The role of the massive constituents is only to
induce the cosmological constant. We consider the instanton solutions of the
Euclidean Liouville gravity with negative and zero cosmological constants, some
instantons being interpreted as two-dimensional anti-de Sitter black
holes. We study thermodynamics of all the solutions and conclude that their
entropy is completely determined by the statistical-mechanical entropy of the
massless constituents. This shows, in particular, that the constituents of the
induced gravity are the true degrees of freedom of black holes. Special
attention is also paid to the induced Liouville gravity with zero cosmological
constant on a torus. We demonstrate the equivalence of its thermodynamics to
the thermodynamics of BTZ black holes and comment on computations of the BTZ
black hole entropy.Comment: 22 pages, latex, no figure