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September  2013, 33(9): 4271-4289. doi: 10.3934/dcds.2013.33.4271

Spectral multiplicities for ergodic flows

Alexandre I. Danilenko 1, and  Mariusz Lemańczyk 2,

1. 

Institute for Low Temperature Physics & Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov, 61164, Ukraine
2. 

Faculty of Mathematics and Computer Science, N. Copernicus University, ul. Chopina 12/18, 87-100 Toruń

Received  August 2010 Revised  February 2011 Published  March 2013

Let $E$ be a subset of positive integers such that $E\cap\{1,2\}\ne\emptyset$. A weakly mixing finite measure preserving flow $T=(T_t)_{t\in\Bbb R}$ is constructed such that the set of spectral multiplicities (of the corresponding Koopman unitary representation generated by $T$) is $E$. Moreover, for each non-zero $t\in\Bbb R$, the set of spectral multiplicities of the transformation $T_t$ is also $E$. These results are partly extended to actions of some other locally compact second countable Abelian groups.
Keywords: Ergodic flow, spectral multiplicities..
Mathematics Subject Classification: Primary: 37A10, 37A3.
Citation: Alexandre I. Danilenko, Mariusz Lemańczyk. Spectral multiplicities for ergodic flows. Discrete & Continuous Dynamical Systems - A, 2013, 33 (9) : 4271-4289. doi: 10.3934/dcds.2013.33.4271
References:
[1]

O. N. Ageev, On ergodic transformations with homogeneous spectrum,, J. Dynam. Control Systems 5 (1999), 5 (1999), 149.   Google Scholar

[2]

A. I. Danilenko, $(C,F)$-actions in ergodic theory,, Progr. Math. 265 (2008), 265 (2008), 325.   Google Scholar

[3]

A. I. Danilenko, Explicit solution of Rokhlin's problem on homogeneous spectrum and applications,, Ergod. Th. & Dyn. Syst. 26 (2006), 26 (2006), 1467.   Google Scholar

[4]

A. I. Danilenko, On new spectral multiplicities for ergodic maps,, Studia Math. 197 (2010), 197 (2010), 57.   Google Scholar

[5]

A. I. Danilenko and S. V. Solomko, Ergodic Abelian actions with homogeneous spectrum,, Contemp. Math. 532 (2010), 532 (2010), 137.   Google Scholar

[6]

I. Filipowicz, Product $Z^d$-actions on a Lebesgue space and their applications,, Studia Math. 122 (1997), 122 (1997), 289.   Google Scholar

[7]

K. Frączek, Cyclic space isomorphism of unitary operators,, Studia Math. 124 (1997), 124 (1997), 259.   Google Scholar

[8]

G. R. Goodson, A survey of recent results in the spectral theory of ergodic dynamical systems,, J. Dynam. Control Systems 5 (1999), 5 (1999), 173.   Google Scholar

[9]

E. Hewitt and K. A. Ross, "Abstract Harmonic Analysis'',, Vol. I, (1963).   Google Scholar

[10]

A. Katok and M. Lemańczyk, Some new cases of realization of spectral multiplicity function for ergodic transformations,, Fund. Math. 206 (2009), 206 (2009), 185.   Google Scholar

[11]

A. Katok and J.-P. Thouvenot, Spectral properties and combinatorial constructions in ergodic theory,, in, (2006), 649.   Google Scholar

[12]

R. A. Konev and V. V. Ryzhikov, On spectral multiplicities ${2,\ldots,2^n}$ for totally ergodic $\mathbbZ^2$-actions,, Preprint, ().   Google Scholar

[13]

J. Kwiatkowski jr and M. Lemańczyk, On the multiplicity function of ergodic group extensions. II,, Studia Math., 116 (1995), 207.   Google Scholar

[14]

A. del Junco and D. Rudolph, On ergodic actions whose self-joinings are graphs,, Erg. Th. & Dyn. Syst., 7 (1987), 531.   Google Scholar

[15]

M. Lemańczyk, Spectral theory of dynamical systems,, in, (2009), 8554.   Google Scholar

[16]

M. Lemańczyk and F. Parreau, Special flows over irrational rotations with the simple convolutions property,, preprint., ().   Google Scholar

[17]

G. Mackey, Induced representations of locally compact groups. I,, Ann. Math. 55 (1952), 55 (1952), 101.   Google Scholar

[18]

V. V. Ryzhikov, Transformations having homogeneous spectra,, J. Dynam. Control Systems, 5 (1999), 145.   Google Scholar

[19]

V. V. Ryzhikov, Spectral multiplicities and asymptotic operator properties of actions with an invariant measure,, Mat. Sb., 200 (2009), 107.   Google Scholar

[20]

R. Zimmer, Induced and amenable ergodic actions of Lie groups,, Ann. Sci. Ecole Norm. Sup., 11 (1978), 407.   Google Scholar

show all references

References:
[1]

O. N. Ageev, On ergodic transformations with homogeneous spectrum,, J. Dynam. Control Systems 5 (1999), 5 (1999), 149.   Google Scholar

[2]

A. I. Danilenko, $(C,F)$-actions in ergodic theory,, Progr. Math. 265 (2008), 265 (2008), 325.   Google Scholar

[3]

A. I. Danilenko, Explicit solution of Rokhlin's problem on homogeneous spectrum and applications,, Ergod. Th. & Dyn. Syst. 26 (2006), 26 (2006), 1467.   Google Scholar

[4]

A. I. Danilenko, On new spectral multiplicities for ergodic maps,, Studia Math. 197 (2010), 197 (2010), 57.   Google Scholar

[5]

A. I. Danilenko and S. V. Solomko, Ergodic Abelian actions with homogeneous spectrum,, Contemp. Math. 532 (2010), 532 (2010), 137.   Google Scholar

[6]

I. Filipowicz, Product $Z^d$-actions on a Lebesgue space and their applications,, Studia Math. 122 (1997), 122 (1997), 289.   Google Scholar

[7]

K. Frączek, Cyclic space isomorphism of unitary operators,, Studia Math. 124 (1997), 124 (1997), 259.   Google Scholar

[8]

G. R. Goodson, A survey of recent results in the spectral theory of ergodic dynamical systems,, J. Dynam. Control Systems 5 (1999), 5 (1999), 173.   Google Scholar

[9]

E. Hewitt and K. A. Ross, "Abstract Harmonic Analysis'',, Vol. I, (1963).   Google Scholar

[10]

A. Katok and M. Lemańczyk, Some new cases of realization of spectral multiplicity function for ergodic transformations,, Fund. Math. 206 (2009), 206 (2009), 185.   Google Scholar

[11]

A. Katok and J.-P. Thouvenot, Spectral properties and combinatorial constructions in ergodic theory,, in, (2006), 649.   Google Scholar

[12]

R. A. Konev and V. V. Ryzhikov, On spectral multiplicities ${2,\ldots,2^n}$ for totally ergodic $\mathbbZ^2$-actions,, Preprint, ().   Google Scholar

[13]

J. Kwiatkowski jr and M. Lemańczyk, On the multiplicity function of ergodic group extensions. II,, Studia Math., 116 (1995), 207.   Google Scholar

[14]

A. del Junco and D. Rudolph, On ergodic actions whose self-joinings are graphs,, Erg. Th. & Dyn. Syst., 7 (1987), 531.   Google Scholar

[15]

M. Lemańczyk, Spectral theory of dynamical systems,, in, (2009), 8554.   Google Scholar

[16]

M. Lemańczyk and F. Parreau, Special flows over irrational rotations with the simple convolutions property,, preprint., ().   Google Scholar

[17]

G. Mackey, Induced representations of locally compact groups. I,, Ann. Math. 55 (1952), 55 (1952), 101.   Google Scholar

[18]

V. V. Ryzhikov, Transformations having homogeneous spectra,, J. Dynam. Control Systems, 5 (1999), 145.   Google Scholar

[19]

V. V. Ryzhikov, Spectral multiplicities and asymptotic operator properties of actions with an invariant measure,, Mat. Sb., 200 (2009), 107.   Google Scholar

[20]

R. Zimmer, Induced and amenable ergodic actions of Lie groups,, Ann. Sci. Ecole Norm. Sup., 11 (1978), 407.   Google Scholar

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