*Astron. Astrophys. 339, 921-928 (1998)*
## 6. Are observational tests possible?
It follows from our formulae that the scintillation effects
specifically predicted by scalar-tensor theories are proportional to
the amplitude of the scalar field perturbation at the observer. This
*local* character casts a serious doubt on the detectability of
these effects, since the scalar field perturbation is very small for a
localized source of gravitational waves.
Indeed, one can put in most cases , where
is a dimensionless constant coupling the
scalar field with the metric gravitational field (see, *e.g.* ,
Damour & Esposito-Farèse 1992). Experiments in the solar
system and observations of binary pulsars like PSR 1913+16 indicate
that . Consequently, setting
for gravitational waves emitted by localized
sources gives and the effect is much too weak
to be detected.
© European Southern Observatory (ESO) 1998
Online publication: October 22, 1998
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