SKEW PRODUCT SMALE ENDOMORPHISMS OVER COUNTABLE SHIFTS OF FINITE TYPE

We introduce and study skew product Smale endomorphisms over finitely irreducible topological Markov shifts with countable alphabets. We prove that almost all conditional measures of equilibrium states of summable and locally Holder continuous
potentials are dimensionally exact, and that their dimension is equal to the ratio of the (global) entropy and the Lyapunov exponent. We also prove for them a formula of Bowen type for the Hausdorff dimension of all fibers. We develop a version of thermodynamic
formalism for finitely irreducible two-sided topological Markov shifts with countable alphabets.
We describe then the thermodynamic formalism for Smale skew products over
countable-to-1 endomorphisms, and give several applications to measures on natural extensions of endomorphisms. We show that the exact dimensionality of conditional measures on fibers, implies the global exact dimensionality of the measure, in certain cases. We
then study equilibrium states for skew products over endomorphisms generated by graph directed Markov systems, in particular for skew products over expanding Markov-Renyi (EMR) maps, and we settle the question of the exact dimensionality of such measures. In
particular, this applies to skew products over the continued fractions transformation, and over parabolic maps. We prove next two results related to Diophantine approximation, which make the Doeblin-Lenstra Conjecture more general and more precise, for a different class of measures than in the classical case. In the end, we

M-theoretic Lichnerowicz formula and supersymmetry

A suitable generalisation of the Lichnerowicz formula can relate the squares of supersymmetric
operators to the effective action, the Bianchi identities for fluxes, and some equations of
motion. Recently, such formulae have also been shown to underlie the (generalised) geometry
of supersymmetric theories. In this paper, we derive an M-theoretic Lichnerowicz formula that
describes eleven-dimensional supergravity together with its higher-derivative couplings. The
first corrections to the action appear at eight-derivative level, and the construction yields two
different supersymmetric invariants, each with a free coefficient. We discuss the restriction of
our construction to seven-dimensional internal spaces, and implications for compactifications
on manifolds of G 2 holonomy. Inclusion of fluxes and computation of contributions with
higher than eight derivatives are also discussed.

Modification of Schrodinger-Newton equation due to braneworld models with minimal length

We study the correction of the energy spectrum of a gravitational quantum well due to the combined effect of the braneworld model with infinite extra dimensions and generalized uncertainty principle. The correction terms arise from a natural deformation of a semiclassical theory of quantum gravity governed by the Schrodinger-Newton equation based on a minimal length framework. The two fold correction in the energy yields new values of the spectrum, which are closer to the values obtained in the GRANIT experiment. This raises the possibility that the combined theory of the semiclassical quantum gravity and the generalized uncertainty principle may provide an intermediate theory between the semiclassical and the full theory of quantum gravity. We also prepare a schematic experimental set-up which may guide to the understanding of the phenomena in the laboratory.

Quantum Supersymmetric Cosmological Billiards and their Hidden Kac-Moody Structure

Software modules and computer-assisted proof schemes in the Kontsevich deformation quantization

The Kontsevich deformation quantization combines Poisson dynamics, noncommutative geometry, number theory, and calculus of oriented graphs. To manage the algebra and differential calculus of series of weighted graphs, we present software modules: these allow generating the Kontsevich graphs, expanding the non-commutative ⋆-product by using a priori undetermined coefficients, and deriving linear relations between the weights of graphs. Throughout this text we illustrate the assembly of the Kontsevich ⋆-product up to order 4 in the deformation parameter ħ. Already at this stage, the ⋆-product involves hundreds of graphs; expressing all their coefficients via 149 weights of basic graphs (of which 67 weights are now known exactly), we express the remaining 82 weights in terms of only 10 parameters (more specifically, in terms of only 6 parameters modulo gauge-equivalence). Finally, we outline a scheme for computer-assisted proof of the associativity, modulo o(ħ^4), for the newly built ⋆-product expansion.

Galois equivariance of critical values of $L$-functions for unitary groups

The goal of this paper is to provide a refinement of a formula proved by the first author which expresses some critical values of automorphic $L$-functions on unitary groups as Petersson norms of automorphic forms. Here we provide a Galois equivariant version of the formula. We also give some applications to special values of automorphic representations of $\GL_{n}\times\GL_{1}$. We show that our results are compatible with Deligne's conjecture.

Deducing the symmetry of the standard model from the automorphism and structure groups of the exceptional Jordan algebra

We continue the study undertaken in [DV] of the exceptional Jordan algebra $J = J_3^8$ as (part of) the finite-dimensional quantum algebra in an almost classical space-time approach to particle physics. Along with reviewing known properties of $J$ and of the associated exceptional Lie groups we argue that the symmetry of the model can be deduced from the Borel-Siebenthal theory of maximal subgroups of simple compact Lie groups.

Examples of pre-CY structures, associated operads and cohomologies

On the four-loop static contribution to the gravitational interaction potential of two point masses