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By Schreier O., Sperner E.

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Hirzebruch, F. and Singer, I. Harvard University, May 1999; see also Geometric Physics, hep-th/9810149, Documenta Mathematica, Extra Volume ICM 1998, 537–556. , Gawedzki, K. Conformal Field Theory and Geometry of Strings, hep-th/9310187. it 1. Introduction The year 1998 has witnessed two major revolutions in physics that have a crucial feature in common: both of them are based on a nonvanishing cosmological constant. The first revolution comes from some important progress in the astronomical observations [1, 2] which have led to the surprising conclusion that the recent universe is dominated by an almost spatially homogeneous exotic form of energy density to which there corresponds a negative pressure.

Indeed, as the exponentials exp i p · x that are labelled by the momentum vector, the waves are labelled by the ‘momentum direction’ ξ and by the ‘modulus’ ν. There is however an unexpected difficulty: the plane waves are singular on (d − 1)-dimensional light-like submanifolds of dS d that are the intersection of dS d with the hyperplane tangent to the cone along ξ. To deal with that singularity let us introduce the complexification of the de Sitter spacetime, that can be represented as the complex hyperboloid (c) dS d = {z = x + iy ∈ Cd+1 : z0 2 − z1 2 − · · · − zd 2 = −R2 }.

The mathematical problems arising from this simple fact are of considerable difficulty and a true solution seems not to be accessible to heuristic methods. Due to its topical character, the literature on the de Sitter and anti-de Sitter universes is very broad but the results obtained so far do not reach much beyond the construction of free theories. Difficulties persist as regards both the acquisition of general and structural results as well as in operational and computational possibilities: computations which in the Minkowskian case would be simple and occasionally even trivial become quickly prohibitive or even impossible.

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