Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-06-20
Class.Quant.Grav.24:291-312,2007
Physics
High Energy Physics
High Energy Physics - Theory
24 pages; uses youngtab.sty; v2: minor changes; version to appear in CQG
Scientific paper
10.1088/0264-9381/24/2/003
We give a simplified formula for the star product on CP^n_L, which enables us to define a twist element suited for discussing a Drinfeld twist like structure on fuzzy complex projective spaces. The existence of such a twist will have several consequences for field theories on fuzzy spaces, some of which we discuss in the present paper. As expected, we find that the twist of the coproduct is trivial for the generators of isometries on CP^n_L. Furthermore, the twist allows us to define a covariant tensor calculus on CP^n_L from the perspective of the standard embedding of CP^n in flat Euclidean space. That is, we find a representation of a truncated subgroup of the diffeomorphisms on CP^n on the algebra of functions on CP^n_L. Using this calculus, we eventually write down an Einstein-Hilbert action on the fuzzy sphere, which is invariant under twisted diffeomorphisms.
Kurkcuoglu Seckin
Saemann Christian
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