Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996stin...9816896d&link_type=abstract
Technical Report, PB96-163159; IHES/P/96/13 ; Dept. of Physics; School of Natural Sciences
Physics
Gravitation, Neutron Stars, Gravitational Fields, Pulsars, Binary Stars, Tensors, Scalers, Inequalities, Ferromagnetism, Form Factors, Solar System, Scalars, Relativity, Observation, Moments Of Inertia
Scientific paper
Some recently discovered nonperturbative strong-field effects in tensor-scalar theories of gravitation are interpreted as a scalar analog of ferromagnetism: 'spontaneous scalarization'. This phenomenon leads to very significant deviations from general relativity in conditions involving strong gravitational fields, notably binary-pulsar experiments. Contrary to solar-system experiments, these deviations do not necessarily vanish when the weak-field scalar coupling tends to zero. We compute the scalar 'form factors' measuring these deviations, and notably a parameter entering the pulsar timing observable gamma through scalar-field-induced variations of the inertia moment of the pulsar. An exploratory investigation of the confrontation between tensor-scalar theories and binary-pulsar experiments shows that nonperturbative scalar field effects are already very tightly constrained by published data on three binary-pulsar systems.
Damour Thibault
Esposito-Farèse Gilles
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