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Geometry of the spacetime with a spherical shell embedded in it is studied in two coordinate systems - in Kodama-Schwarzschild coordinates and in Gaussian normal coordinates. We consider transformations between the coordinate systems as in…

General Relativity and Quantum Cosmology · Physics 2016-03-23 Mikhail Z. Iofa

In this paper we calculate the curvature of the Hitchin connection. We further show that a slight (possibly trivial) modification of the Hitchin connection has curvature equal to an explict given multiple of the Weil-Petersen symplectic…

Differential Geometry · Mathematics 2016-09-06 Jørgen Ellegaard Andersen , Niccolo Skovgård Poulsen

We prove that for the torus with one hole and p greater than or equal to 1 punctures and the sphere with four holes there is a family of quantum trace functions in the quantum Teichm\"uller space, analog to the non-quantum trace functions…

Quantum Algebra · Mathematics 2014-10-01 Chris Hiatt

``Quasi-elliptic'' functions can be given a ring structure in two different ways, using either ordinary multiplication, or convolution. The map between the corresponding standard bases is calculated. A related structure has appeared…

Rings and Algebras · Mathematics 2021-05-13 Marianne Leitner

We introduce coordinates for a principal bundle $S\tilde T(F)$ over the super Teichmueller space $ST(F)$ of a surface $F$ with $s\geq 1$ punctures that extend the lambda length coordinates on the decorated bundle $\tilde T(F)=T(F)\times…

Geometric Topology · Mathematics 2019-11-06 R. C. Penner , Anton M. Zeitlin

Quasi-polar spaces are sets of points having the same intersection numbers with respect to hyperplanes as classical polar spaces. Non-classical examples of quasi-quadrics have been constructed using a technique called pivoting [5]. We…

Combinatorics · Mathematics 2021-09-28 Jeroen Schillewaert , Geertrui Van de Voorde

There is considered a connection with skew symmetric torsion on a quasi-K\"ahler manifold with Norden metric. Some necessary and sufficient conditions are derived for the corresponding curvature tensor to be K\"ahlerian. In the case when…

Differential Geometry · Mathematics 2009-07-14 Dimitar Mekerov

This article deals with the construction of surfaces that are suitable for representing pentachords or 5-pitch segments that are in the same $T/I$ class. It is a generalization of the well known \"Ottingen-Riemann torus for triads of…

History and Overview · Mathematics 2013-01-21 Luis A. Piovan

We generalize Fermi coordinates, which correspond to an adapted set of coordinates describing the vicinity of an observer's worldline, to the worldsheet of an arbitrary spatial curve in a static spacetime. The spatial coordinate axes are…

General Relativity and Quantum Cosmology · Physics 2014-11-18 Michael S. Underwood , Karl-Peter Marzlin

We prove that if S is a closed compact surface of negative Euler characteristic, and if R is a quasi-Fuchsian representation in PSL(2,C), then the deformation space M(k,R) of branched projective structures on S with total branching order k…

Geometric Topology · Mathematics 2014-11-11 Gabriel Calsamiglia , Bertrand Deroin , Stefano Francaviglia

We introduce coordinates on the moduli spaces of maximal globally hyperbolic constant curvature 3d spacetimes with cusped Cauchy surfaces S. They are derived from the parametrisation of the moduli spaces by the bundle of measured geodesic…

Mathematical Physics · Physics 2018-09-05 Catherine Meusburger , Carlos Scarinci

We present an outline of the theory of universal Teichmuller space, viewed as part of the theory of QS, the space of quasisymmetric homeomorphisms of a circle. Although elements of QS act in one dimension, most results depend on a…

Complex Variables · Mathematics 2007-05-23 F. P. Gardiner , W. J. Harvey

It has long been established that certain higher-dimensional topological phases of matter support extended objects like quasi-strings and quasi-membranes in their bulk states. In this study, we investigate the physics of these topological…

Mesoscale and Nanoscale Physics · Physics 2025-01-14 Giandomenico Palumbo

We present an example showing that a family of Riemann surfaces obtained by a general plumbing construction does not necessarily give local coordinates on the Teichmueller space.

Complex Variables · Mathematics 2008-07-13 V. Hinich

We explicitly show that the Poisson bracket on the set of shear coordinates introduced by V.V. Fock in 1997 induces the Fenchel--Nielsen bracket on the set of gluing parameters (length and twist parameters) for pairs of pants decomposition…

Geometric Topology · Mathematics 2020-08-31 Leonid O. Chekhov

A general framework is described which associates geometrical structures to any set of $D$ finite-dimensional hermitian matrices $X^a, \ a=1,...,D$. This framework generalizes and systematizes the well-known examples of fuzzy spaces, and…

High Energy Physics - Theory · Physics 2023-02-09 Harold C. Steinacker

It was recently found that connection coefficients of the Heun equation can be derived in closed form using crossing symmetry in two-dimensional Liouville theory via the Nekrasov-Shatashvili functions. In this work, we systematize this…

High Energy Physics - Theory · Physics 2025-02-04 Paolo Arnaudo , Alba Grassi , Qianyu Hao

This paper constructs a family of coordinate systems about a point on a quaternionic contact manifold, called quaternionic contact pseudohermitian normal coordinates. Once defined, conformal variations of the quaternionic contact structure…

Differential Geometry · Mathematics 2008-07-04 Christopher S. Kunkel

We develop a new orbit equivalence framework for holomorphically mating the dynamics of complex polynomials with that of Kleinian surface groups. We show that the only torsion-free Fuchsian groups that can be thus mated are punctured sphere…

Dynamical Systems · Mathematics 2023-05-05 Mahan Mj , Sabyasachi Mukherjee

There exist natural generalizations of the real moduli space of Riemann spheres based on manipulations of Coxeter complexes. These novel spaces inherit a tiling by the graph-associahedra convex polytopes. We obtain explicit configuration…

Geometric Topology · Mathematics 2009-08-27 Suzanne M. Armstrong , Michael Carr , Satyan L. Devadoss , Eric Engler , Ananda Leininger , Michael Manapat