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4 results for Zariski-density

Study TQFT representations for surfaces with boundary, showing irreducibility at prime roots of unity and Zariski density for transcendental parameters.

problem Understanding TQFT representations of mapping class groups with boundary.
method Examined TQFT representations for surfaces with boundary associated with SU(2)SU(2) gauge group or $U_q(\Sl(2))$ quantum group.
result At prime roots of unity, representations are irreducible; for transcendental parameters, the image of mapping class groups is Zariski dense.

We show that a surface group contained in a reductive real algebraic group can be deformed to become Zariski dense, unless its Zariski closure acts transitively on a Hermitian symmetric space of tube type. This is a kind of converse to a rigidity result of Burger, Iozzi and Wienhard.

2010-09-12abs ↗pdf ↗

Maximal representations in infinite dimensional Hermitian spaces are studied with boundary maps.

problem Characterizing maximal representations in infinite dimensional Hermitian symmetric spaces.
method Definition of Toledo number, study of boundary maps, geometric constructions.
result Existence and non-existence conditions for maximal representations.

Our main result is that the image of the quantum representation of a central extension of the mapping class group of the genus g3g\geq 3 closed orientable surface at a prime p5p\geq 5 is a Zariski dense discrete subgroup of some higher rank algebraic semi-simple Lie group Gp\mathbb G_p defined over $\Q$. As an applicat…

2011-06-21abs ↗pdf ↗