

Damir Kinzebulatov 
email:
damkinze@indiana.edu


I am
a Visiting Assistant Professor at Indiana University
Bloomington 


Earlier, a Postdoctoral Fellow at:
Ph.D, University of Toronto, 2012, with P. Milman


CV  


Research: Analysis and PDEs 

[1] "A new approach
to the L^ptheory of \Delta + b\grad, and
its applications to Feller processes with
general drifts",
Ann. Sc.
Norm. Super. Pisa Cl. Sci. (5), to appear, 21 p
diff_singular.pdf We develop a detailed regularity theory of $\Delta +b \cdot \nabla$, $b:\mathbb R^d \rightarrow \mathbb R^d$ ($d \geqslant 3$), in $L^p$ for a wide class of vector fields $b$ combining, for the first time, critical point and critical hypersurface singularities, and not reachable by the standard techniques of perturbation theory. The $L^p$theory is used to construct a Feller process associated with $\Delta +b\cdot\nabla$ ("a Brownian motion perturbed by a singular drift $b$"). [2] (with I.Binder and M.Voda) "Nonperturbative localization with quasiperiodic potential in continuous time", Comm. Math. Phys., to appear, 30 p 1512.06892.pdf We consider continuous onedimensional multifrequency SchrÃ¶dinger operators, with analytic potential, and prove Anderson localization in the regime of positive Lyapunov exponent for almost all phases and almost all Diophantine frequencies. 

[3] "Strong Feller processes with measurevalued drifts", Preprint, arXiv:1508.05983 (2015), 16 p measure_perturb.pdf We extend the technique of [3] to measurevalued drifts, strengthening, in particular, some classical results in the area (e.g. a Brownian motion drifting upward when penetrating certain fractallike sets while also pertrubed by a drift having e.g. critical point singularities xx^{2}). [4] "Feller evolution families and parabolic equations with formbounded vector fields", Osaka J. Math., to appear, 17 p 1407.4861.pdf We show that the weak solutions of parabolic equation $\partial_t u  \Delta u + b(t,x) \cdot \nabla u=0$, $(t,x) \in (0,\infty) \times \mathbb R^d$, $d \geqslant 3$, for drift $b(t,x)$ in a wide class of timedependent vector fields capturing critical singularities, constitute a Feller evolution family and, thus, determine a Feller process. The proof uses a Mosertype iterative procedure and an a priori estimate on the $L^p$norm of the gradient of solution in terms of the $L^q$norm of the gradient of initial function. 


[5] (with A.Brudnyi) "Kohn decomposition for forms on coverings of complex manifolds constrained along the fibres", Trans. Amer. Math. Soc., to appear, 19 p 1403.0967v1.pdf We extend J.J. Kohn's Hodgetype decomposition to the $(p,q)$ Dolbeault cohomology groups of spaces of differential forms taking values in certain (possibly infinite dimensional) holomorphic Banach vector bundles on $D$. We apply this result to compute the $(p,q)$ Dolbeault cohomology groups of some regular coverings of $D$ defined by means of $C^\infty$ forms constrained along fibres of the coverings. [6] (with A.Brudnyi) "Towards OkaCartan theory for algebras of holomorphic functions on coverings of Stein manifolds I", Revista Mat. Iberoamericana, 31(4) (2015), p. 11671230 bru_kinz_1.pdf [7] (with A.Brudnyi) "Towards OkaCartan theory for algebras of holomorphic functions on coverings of Stein manifolds II", Revista Mat. Iberoamericana, 31(4) (2015), p. 9891032 bru_kinz_2.pdf We develop a Complex Function Theory within some Frechet algebras of holomorphic functions on coverings of Stein manifolds, including Bohr's holomorphic almost periodic functions, holomorphic functions bounded along the fibres (arising e.g. in study of corona problem for H^\infty), etc. Our method is based on an extension of OkaCartan theory to coherenttype sheaves on the maximal ideal spaces of these algebras, topological spaces having some important features of complex analytic manifolds. [8] (with A.Brudnyi) "Holomorphic almost periodic functions on coverings of complex manifolds", New York J. Math, 17a (2011), p. 267300 nyjm.pdf We develop the basic elements of Complex Analytic Geometry on the maximal ideal spaces of some Frechet algebras of holomorphic functions. 

[9]
(with L.Shartser)
"Unique
continuation
for
Schroedinger
operators.
Towards an
optimal
result", J.Funct.
Anal., 258 (2010), p.
26622681 UC_jfa.pdf We prove the property of unique continuation for solutions of differential inequality \Delta u \leq Vu, with potential V belonging to a local analogue of a class for which Schroedinger operator \Delta+V is well defined in the sense of formsum. We apply our result to the problem of absence of positive eigenvalues for selfadjoint Schroedinger operators with formbounded potentials V, i.e. potentials that admit critical singularities. Our result stengthens the classical results by E. Stein and D. JerisonC. Kenig. 

[10] (with A.Brudnyi) "Holomorphic semialmost periodic functions", Integr. Equ. Operat. Theory, 66 (2010), p.293325 0911.0954v1.pdf [11] (with A.Brudnyi) "On algebras of holomorphic functons with semialmost periodic boundary values", C. R. Math. Rep. Acad. Sci. Canada, 32 (2010), p.112. [12] (with A.Brudnyi) "On uniform subalgebras of L^{\infty} on the unit circle generated by almost periodic functions", St. Petersburg Math. J., 19 (2008), p.495518 BK  SPbJMath.pdf How does fixing the type of discontinuity of boundary values of a bounded holomorphic function F on the unit disk D affects the properties of F inside of D? Lindelof theorem states that the boundary values f=F_{\partial D} of F can not have firstkind discontinuities. However, there are functions \Phi such that \Phi(F)_{\partial D} can be firstkind disconinuous. It turns out that in the case \Phi(z)=z there is a connection between bounded holomorphic functions on D whose moduli can have only firstkind boundary discontinuities and Sarason's semialmost periodic functions on \partial D (a priori, there is nothing almost periodic about bounded holomorphic functions and firstkind discontinuities!). This link allows us to apply, in our study, the results on almost periodic functions. In particular, we establish for this algebra of bounded of holomorphic functions:  Grothendieck's approximation property (still a conjecture for H^\infty(D)).  Corona theorem.  Results on completion of matrices with entries in this algebra, etc. Our methods admit extension to subalgebras determined by other functions \Phi. 

[13] "A note on GagliardoNirenberg type
inequalities on analytic sets", C. R. Math. Rep.
Acad. Sci. Canada, 30 (2009), p.97105. kinzebulatovC351.pdf We study a new local invariant of singularities of complex analytic sets. This invariant arises as a 'correcting exponent' in a family of Sobolevtype inequalities relating norms of functions on these sets. 

Earlier research while studying for B.Sc and M.Sc: 

[14] "Systems with distributions and viability theorem", J. Math. Anal. Appl., 331 (2007), p. 10461067 kinz_viab.pdf [15] (with V.Derr) "Dynamical generalized functions and the multiplication problem", Russian Math., 51 (2007), p.3243 0603351.pdf We study some qualitative properties of ordinary differential equations arising in singular Optimal Control problems. To carry out this study, we had to introduce a new space of measures (distributions) with a continuous operation of multiplication by firstkind discontinuous functions. [16] (with E. Braverman) "Nicholson blowfiles equation with a distributed delay", Canadian Appl. Math. Q., 14 (2006), p. 107128 brav_kinz.pdf We study properties of some cassical model of Population Dynamics. 

Algorithmic and HF trading: 

[17] (with A.Cartea, S.Jaimungal) "Algorithmic trading with learning", Int. J. Theor. Appl. Finance, to appear, http://ssrn.com/abstract=2373196 (2013), 20 p. http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2373196 We propose a model where an algorithmic trader takes a view on the distribution of prices at a future date and then decides how to trade in the direction of her predictions using the optimal mix of market and limit orders. Namely, we model the asset midquote price as a randomized Brownian bridge S_t=S_0+\sigma\beta_{tT}+ tD/T where D is a random variable that encodes the trader's prior belief on the asset's future price distribution, the noise term \beta_{tT} is a standard Brownian bridge over time interval independent of D. As time flows, the trader learns the realized value of D. [18] (with S.Jaimungal, D.Rubisov) "Optimal accelerated share repurchase", Preprint, SSRN eLibrary, http://ssrn.com/abstract=2360394 (2013), 28 p. http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2360394 An accelerated share repurchase (ASR) allows a firm to repurchase a signicant portion of its shares immediately, while shifting the burden of reducing the impact and uncertainty in the trade to an intermediary. The intermediary must then purchase the shares from the market over several days, weeks, or as much as several months. In this work, we address the intermediary's optimal execution and exit strategy taking into account the impact that trading has on the market. We demonstrate that it is optimal to exercise when the TWAP exceeds \zeta(t)S_t, where S_t is the fundamental price of the asset and \zeta(t) is deterministic. Moreover, we develop a dimensional reduction of the Stochastic Control and Stopping problem and implement an efficient numerical scheme to compute the optimal trading and exit strategies. [19] (with S. Jaimungal) "Optimal execution with a price limiter", RISK, July 2014, http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2199889 

Topological structure of the maximal ideal space 
General
classes of singular vector fields studied in
connection with operator \Delta + b\grad

