[{"type":"journal_article","date_published":"2018-10-15T00:00:00Z","oa":1,"publication_identifier":{"issn":["0951-7715","1361-6544"]},"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","main_file_link":[{"url":"https://arxiv.org/abs/1706.07968","open_access":"1"}],"publication":"Nonlinearity","month":"10","oa_version":"Preprint","keyword":["Mathematical Physics","General Physics and Astronomy","Applied Mathematics","Statistical and Nonlinear Physics"],"language":[{"iso":"eng"}],"external_id":{"arxiv":["1706.07968"]},"citation":{"chicago":"Kaloshin, Vadim, and Ke Zhang. “Density of Convex Billiards with Rational Caustics.” <i>Nonlinearity</i>. IOP Publishing, 2018. <a href=\"https://doi.org/10.1088/1361-6544/aadc12\">https://doi.org/10.1088/1361-6544/aadc12</a>.","ieee":"V. Kaloshin and K. Zhang, “Density of convex billiards with rational caustics,” <i>Nonlinearity</i>, vol. 31, no. 11. IOP Publishing, pp. 5214–5234, 2018.","ama":"Kaloshin V, Zhang K. Density of convex billiards with rational caustics. <i>Nonlinearity</i>. 2018;31(11):5214-5234. doi:<a href=\"https://doi.org/10.1088/1361-6544/aadc12\">10.1088/1361-6544/aadc12</a>","apa":"Kaloshin, V., &#38; Zhang, K. (2018). Density of convex billiards with rational caustics. <i>Nonlinearity</i>. IOP Publishing. <a href=\"https://doi.org/10.1088/1361-6544/aadc12\">https://doi.org/10.1088/1361-6544/aadc12</a>","ista":"Kaloshin V, Zhang K. 2018. Density of convex billiards with rational caustics. Nonlinearity. 31(11), 5214–5234.","mla":"Kaloshin, Vadim, and Ke Zhang. “Density of Convex Billiards with Rational Caustics.” <i>Nonlinearity</i>, vol. 31, no. 11, IOP Publishing, 2018, pp. 5214–34, doi:<a href=\"https://doi.org/10.1088/1361-6544/aadc12\">10.1088/1361-6544/aadc12</a>.","short":"V. Kaloshin, K. Zhang, Nonlinearity 31 (2018) 5214–5234."},"year":"2018","date_updated":"2021-01-12T08:19:10Z","abstract":[{"text":"We show that in the space of all convex billiard boundaries, the set of boundaries with rational caustics is dense. More precisely, the set of billiard boundaries with caustics of rotation number 1/q is polynomially sense in the smooth case, and exponentially dense in the analytic case.","lang":"eng"}],"day":"15","arxiv":1,"doi":"10.1088/1361-6544/aadc12","extern":"1","volume":31,"issue":"11","author":[{"full_name":"Kaloshin, Vadim","orcid":"0000-0002-6051-2628","last_name":"Kaloshin","first_name":"Vadim","id":"FE553552-CDE8-11E9-B324-C0EBE5697425"},{"full_name":"Zhang, Ke","first_name":"Ke","last_name":"Zhang"}],"_id":"8420","intvolume":"        31","title":"Density of convex billiards with rational caustics","date_created":"2020-09-17T10:42:09Z","article_processing_charge":"No","publication_status":"published","quality_controlled":"1","page":"5214-5234","article_type":"original","publisher":"IOP Publishing"},{"status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","extern":"1","volume":28,"type":"journal_article","date_published":"2015-06-30T00:00:00Z","citation":{"ista":"Kaloshin V, Zhang K. 2015. Arnold diffusion for smooth convex systems of two and a half degrees of freedom. Nonlinearity. 28(8), 2699–2720.","short":"V. Kaloshin, K. Zhang, Nonlinearity 28 (2015) 2699–2720.","mla":"Kaloshin, Vadim, and K. Zhang. “Arnold Diffusion for Smooth Convex Systems of Two and a Half Degrees of Freedom.” <i>Nonlinearity</i>, vol. 28, no. 8, IOP Publishing, 2015, pp. 2699–720, doi:<a href=\"https://doi.org/10.1088/0951-7715/28/8/2699\">10.1088/0951-7715/28/8/2699</a>.","chicago":"Kaloshin, Vadim, and K Zhang. “Arnold Diffusion for Smooth Convex Systems of Two and a Half Degrees of Freedom.” <i>Nonlinearity</i>. IOP Publishing, 2015. <a href=\"https://doi.org/10.1088/0951-7715/28/8/2699\">https://doi.org/10.1088/0951-7715/28/8/2699</a>.","ieee":"V. Kaloshin and K. Zhang, “Arnold diffusion for smooth convex systems of two and a half degrees of freedom,” <i>Nonlinearity</i>, vol. 28, no. 8. IOP Publishing, pp. 2699–2720, 2015.","apa":"Kaloshin, V., &#38; Zhang, K. (2015). Arnold diffusion for smooth convex systems of two and a half degrees of freedom. <i>Nonlinearity</i>. IOP Publishing. <a href=\"https://doi.org/10.1088/0951-7715/28/8/2699\">https://doi.org/10.1088/0951-7715/28/8/2699</a>","ama":"Kaloshin V, Zhang K. Arnold diffusion for smooth convex systems of two and a half degrees of freedom. <i>Nonlinearity</i>. 2015;28(8):2699-2720. doi:<a href=\"https://doi.org/10.1088/0951-7715/28/8/2699\">10.1088/0951-7715/28/8/2699</a>"},"year":"2015","date_updated":"2021-01-12T08:19:41Z","abstract":[{"lang":"eng","text":"In the present note we announce a proof of a strong form of Arnold diffusion for smooth convex Hamiltonian systems. Let ${\\mathbb T}^2$  be a 2-dimensional torus and B2 be the unit ball around the origin in ${\\mathbb R}^2$ . Fix ρ > 0. Our main result says that for a 'generic' time-periodic perturbation of an integrable system of two degrees of freedom $H_0(p)+\\varepsilon H_1(\\theta,p,t),\\quad \\ \\theta\\in {\\mathbb T}^2,\\ p\\in B^2,\\ t\\in {\\mathbb T}={\\mathbb R}/{\\mathbb Z}$ , with a strictly convex H0, there exists a ρ-dense orbit (θε, pε, t)(t) in ${\\mathbb T}^2 \\times B^2 \\times {\\mathbb T}$ , namely, a ρ-neighborhood of the orbit contains ${\\mathbb T}^2 \\times B^2 \\times {\\mathbb T}$ .\r\n\r\nOur proof is a combination of geometric and variational methods. The fundamental elements of the construction are the usage of crumpled normally hyperbolic invariant cylinders from [9], flower and simple normally hyperbolic invariant manifolds from [36] as well as their kissing property at a strong double resonance. This allows us to build a 'connected' net of three-dimensional normally hyperbolic invariant manifolds. To construct diffusing orbits along this net we employ a version of the Mather variational method [41] equipped with weak KAM theory [28], proposed by Bernard in [7]."}],"day":"30","publication_identifier":{"issn":["0951-7715","1361-6544"]},"doi":"10.1088/0951-7715/28/8/2699","keyword":["Mathematical Physics","General Physics and Astronomy","Applied Mathematics","Statistical and Nonlinear Physics"],"language":[{"iso":"eng"}],"quality_controlled":"1","page":"2699-2720","article_type":"original","publisher":"IOP Publishing","issue":"8","author":[{"orcid":"0000-0002-6051-2628","full_name":"Kaloshin, Vadim","first_name":"Vadim","last_name":"Kaloshin","id":"FE553552-CDE8-11E9-B324-C0EBE5697425"},{"last_name":"Zhang","first_name":"K","full_name":"Zhang, K"}],"_id":"8498","publication":"Nonlinearity","intvolume":"        28","title":"Arnold diffusion for smooth convex systems of two and a half degrees of freedom","month":"06","date_created":"2020-09-18T10:46:43Z","article_processing_charge":"No","oa_version":"None","publication_status":"published"},{"extern":"1","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","volume":315,"abstract":[{"text":"The famous ergodic hypothesis suggests that for a typical Hamiltonian on a typical energy surface nearly all trajectories are dense. KAM theory disproves it. Ehrenfest (The Conceptual Foundations of the Statistical Approach in Mechanics. Ithaca, NY: Cornell University Press, 1959) and Birkhoff (Collected Math Papers. Vol 2, New York: Dover, pp 462–465, 1968) stated the quasi-ergodic hypothesis claiming that a typical Hamiltonian on a typical energy surface has a dense orbit. This question is wide open. Herman (Proceedings of the International Congress of Mathematicians, Vol II (Berlin, 1998). Doc Math 1998, Extra Vol II, Berlin: Int Math Union, pp 797–808, 1998) proposed to look for an example of a Hamiltonian near H0(I)=⟨I,I⟩2 with a dense orbit on the unit energy surface. In this paper we construct a Hamiltonian H0(I)+εH1(θ,I,ε) which has an orbit dense in a set of maximal Hausdorff dimension equal to 5 on the unit energy surface.","lang":"eng"}],"doi":"10.1007/s00220-012-1532-x","publication_identifier":{"issn":["0010-3616","1432-0916"]},"day":"01","date_published":"2012-11-01T00:00:00Z","type":"journal_article","date_updated":"2021-01-12T08:19:44Z","citation":{"ista":"Kaloshin V, Saprykina M. 2012. An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension. Communications in Mathematical Physics. 315(3), 643–697.","short":"V. Kaloshin, M. Saprykina, Communications in Mathematical Physics 315 (2012) 643–697.","mla":"Kaloshin, Vadim, and Maria Saprykina. “An Example of a Nearly Integrable Hamiltonian System with a Trajectory Dense in a Set of Maximal Hausdorff Dimension.” <i>Communications in Mathematical Physics</i>, vol. 315, no. 3, Springer Nature, 2012, pp. 643–97, doi:<a href=\"https://doi.org/10.1007/s00220-012-1532-x\">10.1007/s00220-012-1532-x</a>.","ieee":"V. Kaloshin and M. Saprykina, “An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension,” <i>Communications in Mathematical Physics</i>, vol. 315, no. 3. Springer Nature, pp. 643–697, 2012.","chicago":"Kaloshin, Vadim, and Maria Saprykina. “An Example of a Nearly Integrable Hamiltonian System with a Trajectory Dense in a Set of Maximal Hausdorff Dimension.” <i>Communications in Mathematical Physics</i>. Springer Nature, 2012. <a href=\"https://doi.org/10.1007/s00220-012-1532-x\">https://doi.org/10.1007/s00220-012-1532-x</a>.","ama":"Kaloshin V, Saprykina M. An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension. <i>Communications in Mathematical Physics</i>. 2012;315(3):643-697. doi:<a href=\"https://doi.org/10.1007/s00220-012-1532-x\">10.1007/s00220-012-1532-x</a>","apa":"Kaloshin, V., &#38; Saprykina, M. (2012). An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension. <i>Communications in Mathematical Physics</i>. Springer Nature. <a href=\"https://doi.org/10.1007/s00220-012-1532-x\">https://doi.org/10.1007/s00220-012-1532-x</a>"},"year":"2012","article_type":"original","publisher":"Springer Nature","language":[{"iso":"eng"}],"keyword":["Mathematical Physics","Statistical and Nonlinear Physics"],"page":"643-697","quality_controlled":"1","month":"11","title":"An example of a nearly integrable Hamiltonian system with a trajectory dense in a set of maximal Hausdorff dimension","intvolume":"       315","oa_version":"None","publication_status":"published","article_processing_charge":"No","date_created":"2020-09-18T10:47:16Z","author":[{"id":"FE553552-CDE8-11E9-B324-C0EBE5697425","orcid":"0000-0002-6051-2628","full_name":"Kaloshin, Vadim","first_name":"Vadim","last_name":"Kaloshin"},{"first_name":"Maria","last_name":"Saprykina","full_name":"Saprykina, Maria"}],"issue":"3","_id":"8502","publication":"Communications in Mathematical Physics"},{"date_updated":"2021-01-12T08:19:52Z","year":"2000","citation":{"ama":"Kaloshin V. Generic diffeomorphisms with superexponential growth of number of periodic orbits. <i>Communications in Mathematical Physics</i>. 2000;211:253-271. doi:<a href=\"https://doi.org/10.1007/s002200050811\">10.1007/s002200050811</a>","apa":"Kaloshin, V. (2000). Generic diffeomorphisms with superexponential growth of number of periodic orbits. <i>Communications in Mathematical Physics</i>. Springer Nature. <a href=\"https://doi.org/10.1007/s002200050811\">https://doi.org/10.1007/s002200050811</a>","chicago":"Kaloshin, Vadim. “Generic Diffeomorphisms with Superexponential Growth of Number of Periodic Orbits.” <i>Communications in Mathematical Physics</i>. Springer Nature, 2000. <a href=\"https://doi.org/10.1007/s002200050811\">https://doi.org/10.1007/s002200050811</a>.","ieee":"V. Kaloshin, “Generic diffeomorphisms with superexponential growth of number of periodic orbits,” <i>Communications in Mathematical Physics</i>, vol. 211. Springer Nature, pp. 253–271, 2000.","short":"V. Kaloshin, Communications in Mathematical Physics 211 (2000) 253–271.","mla":"Kaloshin, Vadim. “Generic Diffeomorphisms with Superexponential Growth of Number of Periodic Orbits.” <i>Communications in Mathematical Physics</i>, vol. 211, Springer Nature, 2000, pp. 253–71, doi:<a href=\"https://doi.org/10.1007/s002200050811\">10.1007/s002200050811</a>.","ista":"Kaloshin V. 2000. Generic diffeomorphisms with superexponential growth of number of periodic orbits. Communications in Mathematical Physics. 211, 253–271."},"date_published":"2000-04-01T00:00:00Z","type":"journal_article","doi":"10.1007/s002200050811","day":"01","publication_identifier":{"issn":["0010-3616","1432-0916"]},"abstract":[{"text":"Let M be a smooth compact manifold of dimension at least 2 and Diffr(M) be the space of C r smooth diffeomorphisms of M. Associate to each diffeomorphism f;isin; Diffr(M) the sequence P n (f) of the number of isolated periodic points for f of period n. In this paper we exhibit an open set N in the space of diffeomorphisms Diffr(M) such for a Baire generic diffeomorphism f∈N the number of periodic points P n f grows with a period n faster than any following sequence of numbers {a n } n ∈ Z + along a subsequence, i.e. P n (f)>a ni for some n i →∞ with i→∞. In the cases of surface diffeomorphisms, i.e. dim M≡2, an open set N with a supergrowth of the number of periodic points is a Newhouse domain. A proof of the man result is based on the Gontchenko–Shilnikov–Turaev Theorem [GST]. A complete proof of that theorem is also presented.","lang":"eng"}],"volume":211,"extern":"1","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","_id":"8525","publication":"Communications in Mathematical Physics","author":[{"id":"FE553552-CDE8-11E9-B324-C0EBE5697425","orcid":"0000-0002-6051-2628","full_name":"Kaloshin, Vadim","first_name":"Vadim","last_name":"Kaloshin"}],"publication_status":"published","oa_version":"None","article_processing_charge":"No","date_created":"2020-09-18T10:50:20Z","month":"04","title":"Generic diffeomorphisms with superexponential growth of number of periodic orbits","intvolume":"       211","page":"253-271","quality_controlled":"1","language":[{"iso":"eng"}],"keyword":["Mathematical Physics","Statistical and Nonlinear Physics"],"publisher":"Springer Nature","article_type":"original"},{"volume":10,"extern":"1","status":"public","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","date_updated":"2021-01-12T08:19:53Z","year":"1997","citation":{"ieee":"B. R. Hunt and V. Kaloshin, “How projections affect the dimension spectrum of fractal measures,” <i>Nonlinearity</i>, vol. 10, no. 5. IOP Publishing, pp. 1031–1046, 1997.","chicago":"Hunt, Brian R, and Vadim Kaloshin. “How Projections Affect the Dimension Spectrum of Fractal Measures.” <i>Nonlinearity</i>. IOP Publishing, 1997. <a href=\"https://doi.org/10.1088/0951-7715/10/5/002\">https://doi.org/10.1088/0951-7715/10/5/002</a>.","ama":"Hunt BR, Kaloshin V. How projections affect the dimension spectrum of fractal measures. <i>Nonlinearity</i>. 1997;10(5):1031-1046. doi:<a href=\"https://doi.org/10.1088/0951-7715/10/5/002\">10.1088/0951-7715/10/5/002</a>","apa":"Hunt, B. R., &#38; Kaloshin, V. (1997). How projections affect the dimension spectrum of fractal measures. <i>Nonlinearity</i>. IOP Publishing. <a href=\"https://doi.org/10.1088/0951-7715/10/5/002\">https://doi.org/10.1088/0951-7715/10/5/002</a>","ista":"Hunt BR, Kaloshin V. 1997. How projections affect the dimension spectrum of fractal measures. Nonlinearity. 10(5), 1031–1046.","mla":"Hunt, Brian R., and Vadim Kaloshin. “How Projections Affect the Dimension Spectrum of Fractal Measures.” <i>Nonlinearity</i>, vol. 10, no. 5, IOP Publishing, 1997, pp. 1031–46, doi:<a href=\"https://doi.org/10.1088/0951-7715/10/5/002\">10.1088/0951-7715/10/5/002</a>.","short":"B.R. Hunt, V. Kaloshin, Nonlinearity 10 (1997) 1031–1046."},"date_published":"1997-06-19T00:00:00Z","type":"journal_article","doi":"10.1088/0951-7715/10/5/002","publication_identifier":{"issn":["0951-7715","1361-6544"]},"day":"19","abstract":[{"lang":"eng","text":"We introduce a new potential-theoretic definition of the dimension spectrum  of a probability measure for q > 1 and explain its relation to prior definitions. We apply this definition to prove that if  and  is a Borel probability measure with compact support in , then under almost every linear transformation from  to , the q-dimension of the image of  is ; in particular, the q-dimension of  is preserved provided . We also present results on the preservation of information dimension  and pointwise dimension. Finally, for  and q > 2 we give examples for which  is not preserved by any linear transformation into . All results for typical linear transformations are also proved for typical (in the sense of prevalence) continuously differentiable functions."}],"page":"1031-1046","quality_controlled":"1","language":[{"iso":"eng"}],"keyword":["Mathematical Physics","General Physics and Astronomy","Applied Mathematics","Statistical and Nonlinear Physics"],"publisher":"IOP Publishing","article_type":"original","_id":"8527","publication":"Nonlinearity","author":[{"full_name":"Hunt, Brian R","first_name":"Brian R","last_name":"Hunt"},{"id":"FE553552-CDE8-11E9-B324-C0EBE5697425","orcid":"0000-0002-6051-2628","full_name":"Kaloshin, Vadim","first_name":"Vadim","last_name":"Kaloshin"}],"issue":"5","publication_status":"published","oa_version":"None","date_created":"2020-09-18T10:50:41Z","article_processing_charge":"No","month":"06","title":"How projections affect the dimension spectrum of fractal measures","intvolume":"        10"}]