Massless Scalar Field in a Two-dimensional de Sitter Universe

  • Marco Bertola
  • Francesco Corbetta
  • Ugo Moschella
Part of the Progress in Mathematics book series (PM, volume 251)


We study the massless minimally coupled scalar field on a two-dimensional de Sitter space-time in the setting of axiomatic quantum field theory. We construct the invariant Wightman distribution obtained as the renormalized zeromass limit of the massive one. Insisting on gauge invariance of the model we construct a vacuum state and a Hilbert space of physical states which are invariant under the action of the whole de Sitter group. We also present the integral expression of the conserved charge which generates the gauge invariance and propose a definition of dual field.


Gauge Transformation Gauge Invariance Massless Scalar Krein Space Renormalization Procedure 
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Copyright information

© Birkhäuser Verlag 2007

Authors and Affiliations

  • Marco Bertola
    • 1
  • Francesco Corbetta
    • 2
  • Ugo Moschella
    • 2
    • 3
  1. 1.Department of Mathematics and StatisticsConcordia UniversityMontrealCanada
  2. 2.Dipartimento di Fisica e MatematicaUniversità dell’InsubriaComoItalia
  3. 3.INFNSez. di MilanoMilanoItalia

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