Local rigidity of homogeneous parabolic actions: I. A model case

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April 2011, 5(2): 203-235. doi: 10.3934/jmd.2011.5.203

Local rigidity of homogeneous parabolic actions: I. A model case

Danijela Damjanovic ^1, and Anatole Katok ^2,

1.	Department of Mathematics, Rice University, 6100 Main St., Houston, TX 77005, United States
2.	Department of Mathematics, The Pennsylvania State University, University Park, PA 16802

Received March 2010 Revised April 2011 Published July 2011

Abstract
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We show a weak form of local differentiable rigidity for the rank $2$ abelian action of upper unipotents on $SL(2,R)$ $\times$ $SL(2,R)$ $/\Gamma$. Namely, for a $2$-parameter family of sufficiently small perturbations of the action, satisfying certain transversality conditions, there exists a parameter for which the perturbation is smoothly conjugate to the action up to an automorphism of the acting group. This weak form of rigidity for the parabolic action in question is optimal since the action lives in a family of dynamically different actions. The method of proof is based on a KAM-type iteration and we discuss in the paper several other potential applications of our approach.

Keywords: Local rigidity, KAM method., homogeneous actions.

Mathematics Subject Classification: 37C8.

Citation: Danijela Damjanovic, Anatole Katok. Local rigidity of homogeneous parabolic actions: I. A model case. Journal of Modern Dynamics, 2011, 5 (2) : 203-235. doi: 10.3934/jmd.2011.5.203

References:

[1]	E. J. Benveniste, Rigidity of isometric lattice actions on compact Riemannian manifolds,, Geom. Funct. Anal., 10 (2000), 516. doi: 10.1007/PL00001627. Google Scholar
[2]	D. Damjanović, Central extensions of simple Lie groups and rigidity of some abelian partially hyperbolic algebraic actions,, J. Mod. Dyn., 1 (2007), 665. doi: 10.3934/jmd.2007.1.665. Google Scholar
[3]	D. Damjanović and A. Katok, Local rigidity of restrictions of Weyl chamber flows,, C. R. Math. Acad. Sci. Paris, 344 (2007), 503. Google Scholar
[4]	D. Damjanović and A. Katok, Local rigidity of partially hyperbolic actions. II. The geometric method and restrictions of Weyl chamber flows on $SL(n, R)$$/\Gamma$,, Int. Math. Res. Notes, (2010). doi: 10.1093/imrn/rnq252. Google Scholar
[5]	D. Damjanović and A. Katok, Local rigidity of actions of higher-rank abelian groups and KAM method,, Electron. Res. Announc. Amer. Math. Soc., 10 (2004), 142. Google Scholar
[6]	D. Damjanović and A. Katok, Local rigidity of partially hyperbolic actions I. KAM method and $\Z^k$ actions on the torus,, Ann. of Math. (2), 172 (2010), 1805. Google Scholar
[7]	D. Fisher, First cohomology and local rigidity of group actions,, Ann. of Math., (). Google Scholar
[8]	L. Flaminio and G. Forni, Invariant distributions and time averages for horocycle flows,, Duke Math. J., 119 (2003), 465. Google Scholar
[9]	R. S. Hamilton, The inverse function theorem of Nash and Moser,, Bull. Amer. Math. Soc. (N.S.), 7 (1982), 65. Google Scholar
[10]	B. Hasselblatt and A. Katok, Principal structures,, in, 1A (2002), 1. Google Scholar
[11]	A. Katok and R. Spatzier, Differential rigidity of Anosov actions of higher-rank abelian groups and algebraic lattice actions,, Proc. Steklov Inst. Math., 216 (1997), 287. Google Scholar
[12]	D. Mieczkowski, The first cohomology of parabolic actions for some higher-rank abelian groups and representation theory,, J. Mod. Dyn., 1 (2007), 61. doi: 10.3934/jmd.2007.1.61. Google Scholar
[13]	D. Mieczkowski, "The Cohomological Equation and Representation Theory,", Ph.D thesis, (2006). Google Scholar
[14]	J. Moser, On commuting circle mappings and simoultaneous Diophantine approximations,, Math. Z., 205 (1990), 105. doi: 10.1007/BF02571227. Google Scholar
[15]	F. Ramirez, Cocycles over higher-rank abelian actions on quotients of semisimple Lie groups,, J. Mod. Dyn., 3 (2009), 335. doi: 10.3934/jmd.2009.3.335. Google Scholar
[16]	E. Zehnder, Generalized implicit-function theorems with applications to some small divisor problems. I,, Comm. Pure Appl. Math., 28 (1975), 91. Google Scholar
[17]	Z. Wang, Local rigidity of partially hyperbolic actions,, J. Mod. Dyn., 4 (2010), 271. doi: 10.3934/jmd.2010.4.271. Google Scholar
[18]	Z. Wang, New cases of differentiable rigidity for partially hyperbolic actions: Symplectic groups and resonance directions,, J. Mod. Dyn., 4 (2010), 585. doi: 10.3934/jmd.2010.4.585. Google Scholar

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References:

[1]	E. J. Benveniste, Rigidity of isometric lattice actions on compact Riemannian manifolds,, Geom. Funct. Anal., 10 (2000), 516. doi: 10.1007/PL00001627. Google Scholar
[2]	D. Damjanović, Central extensions of simple Lie groups and rigidity of some abelian partially hyperbolic algebraic actions,, J. Mod. Dyn., 1 (2007), 665. doi: 10.3934/jmd.2007.1.665. Google Scholar
[3]	D. Damjanović and A. Katok, Local rigidity of restrictions of Weyl chamber flows,, C. R. Math. Acad. Sci. Paris, 344 (2007), 503. Google Scholar
[4]	D. Damjanović and A. Katok, Local rigidity of partially hyperbolic actions. II. The geometric method and restrictions of Weyl chamber flows on $SL(n, R)$$/\Gamma$,, Int. Math. Res. Notes, (2010). doi: 10.1093/imrn/rnq252. Google Scholar
[5]	D. Damjanović and A. Katok, Local rigidity of actions of higher-rank abelian groups and KAM method,, Electron. Res. Announc. Amer. Math. Soc., 10 (2004), 142. Google Scholar
[6]	D. Damjanović and A. Katok, Local rigidity of partially hyperbolic actions I. KAM method and $\Z^k$ actions on the torus,, Ann. of Math. (2), 172 (2010), 1805. Google Scholar
[7]	D. Fisher, First cohomology and local rigidity of group actions,, Ann. of Math., (). Google Scholar
[8]	L. Flaminio and G. Forni, Invariant distributions and time averages for horocycle flows,, Duke Math. J., 119 (2003), 465. Google Scholar
[9]	R. S. Hamilton, The inverse function theorem of Nash and Moser,, Bull. Amer. Math. Soc. (N.S.), 7 (1982), 65. Google Scholar
[10]	B. Hasselblatt and A. Katok, Principal structures,, in, 1A (2002), 1. Google Scholar
[11]	A. Katok and R. Spatzier, Differential rigidity of Anosov actions of higher-rank abelian groups and algebraic lattice actions,, Proc. Steklov Inst. Math., 216 (1997), 287. Google Scholar
[12]	D. Mieczkowski, The first cohomology of parabolic actions for some higher-rank abelian groups and representation theory,, J. Mod. Dyn., 1 (2007), 61. doi: 10.3934/jmd.2007.1.61. Google Scholar
[13]	D. Mieczkowski, "The Cohomological Equation and Representation Theory,", Ph.D thesis, (2006). Google Scholar
[14]	J. Moser, On commuting circle mappings and simoultaneous Diophantine approximations,, Math. Z., 205 (1990), 105. doi: 10.1007/BF02571227. Google Scholar
[15]	F. Ramirez, Cocycles over higher-rank abelian actions on quotients of semisimple Lie groups,, J. Mod. Dyn., 3 (2009), 335. doi: 10.3934/jmd.2009.3.335. Google Scholar
[16]	E. Zehnder, Generalized implicit-function theorems with applications to some small divisor problems. I,, Comm. Pure Appl. Math., 28 (1975), 91. Google Scholar
[17]	Z. Wang, Local rigidity of partially hyperbolic actions,, J. Mod. Dyn., 4 (2010), 271. doi: 10.3934/jmd.2010.4.271. Google Scholar
[18]	Z. Wang, New cases of differentiable rigidity for partially hyperbolic actions: Symplectic groups and resonance directions,, J. Mod. Dyn., 4 (2010), 585. doi: 10.3934/jmd.2010.4.585. Google Scholar

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