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Beyond Renormalization in Parabolic Dynamics

Obiettivo

The ergodic theory of parabolic dynamical systems is an area in smooth ergodic theory that is relevant for its connections to mathematical physics and to analytic number theory. A dynamical system is parabolic whenever its orbits diverge at an intermediate (often polynomial) rate between bounded/logarithmic (called elliptic) and exponential (called hyperbolic) rate.

The proposal tackles several outstanding questions in the ergodic theory of parabolic flows with emphasis on quantitative aspects. The main goal is to go beyond renormalization techniques that have proved extremely powerful
in several classes of examples: Interval Exchange Transformations and Flows on surfaces, horocycle flows, nilflows on quotients of step-two nilpotent groups and Gauss sums. Renormalization methods are not available in other equally fundamental examples of similar nature: billiards in non-rational polygons, higher step nilflows and non-horospherical unipotent flows in homogeneous dynamics. A unified approach to effective ergodicity is proposed that encompasses all of the above mentioned examples.

Outstanding questions include ergodicity and existence of periodic orbits of
non-rational billiards in polygons, effective ergodicity of higher step nilflows
with optimal deviation exponents and applications to bounds on Weyl sums
for higher degree polynomials and effective ergodicity of non-horospherical unipotent flows on semi-simple finite-volume quotients.

The analytical foundations of the method lie in the study of invariant distributions for parabolic flows. In the examples considered the analysis
can be carried out by methods of non-Abelian Fourier analysis (theory of
unitary representations). In general, for non-homogeneous parabolic flows,
all questions concerning invariant distributions and their relevance for smooth ergodic theory are wide open. Several problems to probe the question of existence of invariant distributions are proposed.

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Istituzione ospitante

CY CERGY PARIS UNIVERSITE
Contributo netto dell'UE
€ 2 183 838,00
Indirizzo
33 BOULEVARD DU PORT
95011 Cergy-Pontoise
Francia
Regione
Ile-de-France Ile-de-France Val-d’Oise
Tipo di attività
Higher or Secondary Education Establishments
Collegamenti
Costo totale
€ 2 183 838,00

Beneficiari (1)