Pulsar Constraints on Screened Modified Gravity

Abstract

We calculate the rate of energy loss from compact astrophysical objects due to a scalar field in screened modified gravity models of the chameleon, dilaton and symmetron types. The cosmological evolution of the field results in a time-variation of the scalar charge of screened objects implying the emission of scalar radiation. Focusing on binary objects, this leads to an additional decay in the orbital period complementing that due to the emission of gravitational waves. Using the Hulse-Taylor binary pulsar, the double pulsar PSR J0737-3039 and the pulsar-white dwarf system PSR J1738+033, we find a new observational bound on the time variation of the scalar charge of the earth in the Milky Way. We then translate this into a new bound on the range of the scalar interaction in the Milky Way. Ultimately, we find that pulsar tests are not competitive with current observational constraints.

23 pages, published version

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• Disformal Theories of Gravity: From the Solar System to Cosmology
• Testing Gravity Using Galaxy Clusters: New Constraints on Beyond Horndeski Theories
• Testing Brans-Dicke gravity using the Einstein telescope
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• Gravitational radiation from compact binary systems in screened modified gravity
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• Splashback in galaxy clusters as a probe of cosmic expansion and gravity
• Solar System Constraints on Disformal Gravity Theories
• Dark energy interactions near the galactic centre
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• The Classical Symmetron Force in Casimir Experiments
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• Revealing modified gravity signal in matter and halo hierarchical clustering
• Real- and redshift-space halo clustering in $f(R)$ cosmologies
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• Horndeski gravity without screening in binary pulsars
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• Highly compact neutron stars and screening mechanisms. I. Equilibrium and stability
• Multi-scale Constraints on Scalar-Field couplings to Matter: The Geodetic and Frame-Dragging Effects
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