scholarly journals Optimal results in Lorentzian Aubry–Mather theory

2020 ◽  
Author(s):  
Stefan Suhr
Keyword(s):  
Fixed Point ◽  
Invariant Measures ◽  
Lipschitz Continuity ◽  
Fixed Point Theory ◽  
Point Theory ◽  
Multiplicity Results ◽  
Time Separation ◽  
Abelian Cover ◽  
Mather Theory ◽  
Maximal Invariant

AbstractThis article complements the Lorentzian Aubry–Mather Theory in Suhr (Geom Dedicata 160:91–117, 2012; J Fixed Point Theory Appl 21:71, 2019) by giving optimal multiplicity results for the number of maximal invariant measures. As an application the optimal Lipschitz continuity of the time separation on the Abelian cover is established.

scholarly journals Local Mixing and Invariant Measures for Horospherical Subgroups on Abelian Covers

2018 ◽  
Vol 2019 (19) ◽  
pp. 6036-6088
Author(s):  
Hee Oh ◽  
Wenyu Pan
Keyword(s):  
Lie Group ◽  
Invariant Measures ◽  
Dense Subgroup ◽  
Abelian Cover ◽  
Rank One ◽  
Hyperbolic Three Manifolds ◽  
Abelian Covers ◽  
Prime Geodesic Theorem ◽  
Convex Cocompact ◽  
Frame Flow

Abstract Abelian covers of hyperbolic three-manifolds are ubiquitous. We prove the local mixing theorem of the frame flow for abelian covers of closed hyperbolic three-manifolds. We obtain a classification theorem for measures invariant under the horospherical subgroup. We also describe applications to the prime geodesic theorem as well as to other counting and equidistribution problems. Our results are proved for any abelian cover of a homogeneous space Γ0∖G where G is a rank one simple Lie group and Γ0 < G is a convex cocompact Zariski dense subgroup.

The Alexander module of a knotted theta-curve

1989 ◽  
Vol 106 (1) ◽  
pp. 95-106 ◽  
Author(s):  
Rick Litherland
Keyword(s):  
Group Ring ◽  
Torsion Module ◽  
Abelian Cover

Let K be a knotted theta-curve with exterior X, and let ∂_X be one of the two pieces into which ∂X is divided by the meridians of the edges of K. Let X be the universal abelian cover of X. Then is a module over the group ring of H1(X); i.e. over . We call this the Alexander module of K, and denote it by A(K). This, rather than H1(X), seems to be the analogue of the Alexander module of a classical knot; it is a torsion module of deficiency 0. Moreover, it is not an invariant of X alone.

ON THE COMPUTATION OF THE TURAEV-VIRO MODULE OF A KNOT

1998 ◽  
Vol 07 (07) ◽  
pp. 843-856 ◽  
Author(s):  
H. ABCHIR ◽  
C. BLANCHET
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Fundamental Domain ◽  
Topological Quantum Field Theory ◽  
Quantum Field ◽  
Abelian Cover ◽  
Topological Quantum ◽  
Special Case

Let M be the manifold obtained by 0-framed surgery along a knot K in the 3-sphere. A Topological Quantum Field Theory assigns to a fundamental domain of the universal abelian cover of M an operator, whose non-nilpotent part is the Turaev-Viro module of K. In this paper, using surgery formulas, we give a matrix presentation for the Turaev-Viro module of any knot K, in the case of the (Vp, Zp) TQFT of Blanchet, Habegger, Masbaum and Vogel. We do the computation for a family of knots in the special case p = 8, and note the relation with the fibering question.

scholarly journals Non-normal abelian covers

2012 ◽  
Vol 148 (4) ◽  
pp. 1051-1084 ◽  
Author(s):  
Valery Alexeev ◽  
Rita Pardini
Keyword(s):  
Abelian Group ◽  
Moduli Space ◽  
Moduli Spaces ◽  
General Type ◽  
Finite Abelian Group ◽  
Algebraic Varieties ◽  
Surfaces Of General Type ◽  
Normal Case ◽  
Abelian Cover ◽  
Abelian Covers

AbstractAn abelian cover is a finite morphism X→Y of varieties which is the quotient map for a generically faithful action of a finite abelian group G. Abelian covers with Y smooth and X normal were studied in [R. Pardini, Abelian covers of algebraic varieties, J. Reine Angew. Math. 417 (1991), 191–213; MR 1103912(92g:14012)]. Here we study the non-normal case, assuming that X and Y are S2 varieties that have at worst normal crossings outside a subset of codimension greater than or equal to two. Special attention is paid to the case of ℤr2-covers of surfaces, which is used in [V. Alexeev and R. Pardini, Explicit compactifications of moduli spaces of Campedelli and Burniat surfaces, Preprint (2009), math.AG/arXiv:0901.4431] to construct explicitly compactifications of some components of the moduli space of surfaces of general type.

scholarly journals ON THE FUNDAMENTAL GROUP OF AN ABELIAN COVER

1995 ◽  
Vol 06 (05) ◽  
pp. 767-789
Author(s):  
RITA PARDINI ◽  
FRANCESCA TOVENA
Keyword(s):  
Galois Group ◽  
Projective Variety ◽  
Chern Classes ◽  
Branch Locus ◽  
Projective Varieties ◽  
Abelian Cover ◽  
Numerical Invariants ◽  
A Finite Group ◽  
Complex Projective ◽  
Branch Divisor

Let X, Y be smooth complex projective varieties of dimension n≥2 and let f: Y→X be a totally ramified abelian cover. Assume that the components of the branch divisor of f are ample. Then the map f*: π1(Y)→π1(X) is surjective and gives rise to a central extension: [Formula: see text] where K is a finite group. Here we show how the kernel K and the cohomology class c(f) ∈ H2(π1(X), K) of (1) can be computed in terms of the Chern classes of the components of the branch divisor of f and of the eigensheaves of [Formula: see text] under the action of the Galois group. Using this result, for any integer m>0, we construct m varieties X1,…, Xm no two of which are homeomorphic, even though they have the same numerical invariants and they are realized as covers of the same projective variety X with the same Galois group, branch locus and inertia subgroups.

scholarly journals Transitivity of surface dynamics lifted to Abelian covers

2009 ◽  
Vol 29 (5) ◽  
pp. 1417-1449 ◽  
Author(s):  
PHILIP BOYLAND
Keyword(s):  
Finite Type ◽  
Spectral Radius ◽  
Compact Surface ◽  
Surface Dynamics ◽  
Subshift Of Finite Type ◽  
Abelian Cover ◽  
Abelian Covers

AbstractA homeomorphismfof a manifoldMis calledH1-transitive if there is a transitive lift of an iterate offto the universal Abelian cover$\tilde {M}$. Roughly speaking, this means thatfhas orbits which repeatedly and densely explore all elements ofH1(M). For a rel pseudo-Anosov map ϕ of a compact surfaceMwe show that the following are equivalent: (a) ϕ isH1-transitive, (b) the action of ϕ onH1(M) has spectral radius one and (c) the lifts of the invariant foliations of ϕ to$\tilde {M}$have dense leaves. The proof relies on a characterization of transitivity for twisted ℤd-extensions of a transitive subshift of finite type.

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