Welcome to Zoran's Homepage


Zoran


Email: zskoda@irb.hr
Department of Mathematics Page
My nlab pages: bio page, my writings, nlab section
Photo

Zoran Škoda, Ph.D. University of Wisconsin, Madison, 2002

link to the conferences "Categories in geometry and in mathematical physics", September 24-28, 2007 , and summer school Black hole physics, Trpanj, Peljesac, Croatia, June 21-25, 2010; and the Rab conferences on Hot Matter and Gauge Field Theories, 2006 and 2007

Web page of a graduate courses I teach at the University of Zagreb (in Croatian): Sheaves, bundles and cohomology (full acad. yr. 2008/9); and a proposed course for Winter 2009/2010: http://ncatlab.org/zoranskoda/show/homotopija+u+raznim+kategorijama

My main research areas are noncommutative algebraic geometry and geometric aspects of mathematical physics. I have also spent some years on study and projects related to human linguistics (historical and computational) and formal and programming language theory, design, compiler optimization and semantics.

My thesis was titled COSET SPACES FOR QUANTUM GROUPS (see abstract here ). I used Ore localizations and a new concept of localized coinvariants to construct (without any representation theory, or Ansatze) noncommutative schemes which are in a strict sense coset spaces for matrix quantum groups of type A; the motivation and application was to find the geometric theory (and the appropriate measure) for coherent states for quantum groups. Now I use actions of monoidal categories and various sorts of descent theory to further study similar setups. Recently I delved into more categorical algebra and study of various phenomena related to nonabelian cocycles of various sorts. With C. Schweigert I coordinated a bilateral grant Croatia-Germany on NONABELIAN COHOMOLOGY for 2006-7 and now I hold a small similar bilateral grant with Urs Schreiber also on homological algebra and applications. This grant and hospitality of MPIM Bonn enabled me to participate in the work in progress "twisted nonabelian differential cohomology" , commented recently on category cafe. I am also recently active in the construction of nlab.

My PhD thesis advisor was mathematician J. W. Robbin, and A. Chubukov was my physics supervisor. My research host at Indiana University was Valery Lunts . My present boss at IRB (project 098-0000000-2865) is S. Meljanac (he is a theoretical physicist) and I participate in a project on homological and geometric methods in rep. theory lead by P. Pandzic at Zagreb university (037-0372794-2807). My basic education is in theoretical physics but in recent years I am more mathematical in my work and interests. Some people with whom I particularly like to talk mathematics are V. A. Lunts, M. Jibladze U. Schreiber and R. Friedrich. I had less chance but it was very useful talking also to T. Maszczyk, A. L. Rosenberg, G. Sharygin, P. Bressler, B. Noohi, V. Guletskii, G. Bohm, I. Mencattini, Y. Soibelman ... Recently, I was also influenced by my younger colleague in Zagreb, Igor Bakovic. His thesis is on gerbes and bigroupoid bundles.

I am myself planning a book on "Actions, sheaves and categories", but at this point there is only a preliminary list actionsbk.dvi of parts and chapters.

A partial list of my past conference talks and invited seminar talks may be found here.

You can also download online some of my papers (see also a graphically more attractive list at nlab)

Localizations for construction of quantum coset spaces math.QA/0301090, 34 pages. "Noncommutative geometry and Quantum groups", W.Pusz, P.M. Hajac, eds. Banach Center Publications vol.61, pp. 265--298, Warszawa 2003.

Coherent states for Hopf algebras, Letters in Mathematical Physics 81, N.1, pp. 1-17, July 2007. (earlier arXiv version: math.QA/0303357 )

Noncommutative localization in noncommutative geometry, London Math. Society Lecture Note Series 330, ed. A. Ranicki; pp. 220--313, math.QA/0403276.

Distributive laws for actions of monoidal categories math.CT/0406310

Cyclic structures for simplicial objects from comonads math.CT/0412001

Included-row exchange principle for quantum minors math.QA/0510512

A universal formula for representing Lie algebra generators as formal power series with coefficients in the Weyl algebra (with N. Durov, S. Meljanac, A. Samsarov), Journal of Algebra 309, Issue 1, pp.318-359 (2007) (math.RT/0604096)

Every quantum minor generates an Ore set , (free-access link) International Math. Res. Notices 2008, rnn063-8; math.QA/0604610

Equivariant monads and equivariant lifts versus a 2-category of distributive laws (arXiv:0707.1609)

(with S. Meljanac) Leibniz rules for enveloping algebras (pdf)

-------- An older, obsolete version is at arXiv: (arXiv:0711.0149)

S. Meljanac, D. Svrtan, Z. Skoda, Exponential formulas and Lie algebra type star products, SIGMA 8 (2012), 013, 1-15, arxiv:1006.0478

H. Sati, U. Schreiber, Z. Skoda, D. Stevenson, Twisted nonabelian differential cohomology: Twisted (n-1)-brane n-bundles and their Chern-Simons (n+1)-bundles with characteristic (n+2)-classes, preliminary version

A simple algorithm for extending the identities for quantum minors to the multiparametric case (arXiv:0801.4965)

Quantum heaps, cops and heapy categories , Mathematical Communications 12, No. 1, pp. 1-9 (2007); math.QA/0701749.

Bicategory of entwinings arXiv:0805.4611

Twisted exterior derivative for enveloping algebras arXiv:0806.0978

Compatibility of (co)actions and localization (pdf) arXiv:0902.1398 (preliminary version)

Some equivariant constructions in noncommutative algebraic geometry, Georgian Mathematical Journal 16 (2009), No. 1, 183--202, arXiv:0811.4770

Heisenberg double versus deformed derivatives, Int. J. Mod. Physics A 27 & 28 (2011) 4845--4854, arXiv:0909.3769.

(with V. Lunts) Hopf modules, {\rm Ext}-groups and descent (incomplete version)

Bi-actegories (May 2007, preliminary version)

(with Gabriella Böhm) Globalizing Hopf-Galois extensions (preliminary version)

Urs Schreiber, Zoran Skoda, Categorified symmetries, Proceedings of 5th Mathematical Physics Meeting, SFIN, XXII Series A: Conferences, No A1, (2009), 397-424 (Editors: Branko Dragovich, Zoran Rakic). Extended 55 page arxiv version: arXiv/1004.2472 (Summer School and Conference on Modern Mathematical Physics, Institute of Physics, Belgrade, Serbia, July 6-17, 2008)

Domagoj Kovacevic, Stjepan Meljanac, Andjelo Samsarov, Zoran Skoda, Hermitian realizations of kappa-Minkowski spacetime, arxiv/1307.5772

Dimitri Gurevich, Vladimir Rubtsov, Pavel Saponov, Zoran Skoda, Generalizations of Poisson structures related to rational Gaudin model, arxiv/1312.7813, to appear in Annales Henri Poincare

Prilozi za vrednovanje u teorijskim znanstvenim disciplinama I (34 pages, preliminary version, in Croatian)

With my student M. Basic, I work on a programme of finding integration objects for Leibniz algebras, Leibniz groups. Here is a manifesto: Search for Leibniz groups (pdf)

Recently I started working on a short note about functoriality of actegories induced from (co)module algebras. "Functoriality of actegories from comodule algebras". With Georgiy Sharygin we are working on a project on certain star products related to Lie algebroids. The first phase was to construct, in the presence of a connection, a correction to the symmetrization map for Lie algebroids which would make it compactible with coproduct.