2013/03/31 by Jan Zschoche
Mathematics · Physics and Astronomy · #Chaplygin gas #Cosmology and Gravitation Theories #Equation of state #Friedmann–Lemaître–Robertson–Walker metric #Noncommutative and Quantum Gravity Theories #Quantum Electrodynamics and Casimir Effect #Scalar (mathematics) #Scalar field #Scale factor (cosmology) #Spacetime #State (computer science) #gr-qc #math-ph #math.MP
paper · pdf · doi:10.1007/s00023-013-0281-5
33 pages; paper shortened, comments added
openalex publication_date 2013/07/29 · arxiv created 2013/08/02 · arxiv updated 2013/08/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We try to answer the question whether the quantized free scalar field on a spatially flat Friedmann-Robertson-Walker (FRW) spacetime is a matter model that can induce a Chaplygin gas equation of state. For this purpose we first describe how one can obtain every possible homogeneous and isotropic Hadamard (HIH) state once any such state is given. We also identify a condition on the scale factor sufficient to entail the existence of a simple HIH state - this state is constructed explicitly and can thence be used as a starting point for constructing all HIH states. Furthermore, we employ these results to show that on an FRW spacetime with non-positive constant scalar curvature there is, with one exception, no Chaplygin gas equation of state compatible with any HIH state. Finally, we argue that the semi-classical Einstein equation and the Chaplygin gas equation of state can presumably not be consistently solved for the quantized free scalar field.