Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987cqgra...4..975a&link_type=abstract
Classical and Quantum Gravity (ISSN 0264-9381), vol. 4, July 1, 1987, p. 975-993.
Astronomy and Astrophysics
Astronomy
6
Astronomical Models, Big Bang Cosmology, Boundary Value Problems, Decay Rates, Particle Mass, Universe, Gravitational Effects, Minkowski Space
Scientific paper
Mutually interacting quantum fields in 3-flat Robertson-Walker universes are examined. The decay of a massive scalar Phi particle into two massless scalar Psi particles is calculated exactly on the basis of the interaction picture and an in-out approach based on an S matrix. The cosmic scale factor alpha(eta) is thereby specified as (1) a step expansion law and (2) a tanh-expansion law which represents the prototype of a smoothed-out step law. The characteristic modifications of the Minkowskian decay spectrum are examined. A comparison of amplitudes and decay probabilities for the step and tanh expansion laws demonstrates that smoothing out the step introduces a gravitational influence of nonvanishing duration, which leads essentially to finite corrections of the step results.
Audretsch Juergen
Rueger Alexander
Spangehl Peter
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