Constraints on the massive graviton dark matter from pulsar timing and precision astrometry

Pshirkov, Maxim; Tuntsov, Artem; Postnov, Konstantin A.

Constraints on the massive graviton dark matter from pulsar timing and precision astrometry

Authors

Pshirkov, Maxim

Tuntsov, Artem

Postnov, Konstantin A.

Description

The effect of a narrow-band isotropic stochastic GW background on pulsar timing and astrometric measurements is studied. Such a background appears in some theories of gravity. We show that the existing millisecond pulsar timing accuracy ($\sim 0.2 \rm{μs}$) strongly constrains possible observational consequences of theory of massive gravity with spontaneous Lorentz braking \cite{dtt:2005}, essentially ruling out significant contribution of massive gravitons to the local dark halo density. The present-day accuracy of astrometrical measurements ($\sim 100 \rm{μas}$) sets less stringent constraints on this theory.
4 pages, 1 figure; changes in content, references added, accepted for publication in PRL