Dynamical Chameleon Neutron Stars: stability, radial oscillations and scalar radiation in spherical symmetry

Understand

Scalar-tensor theories whose phenomenology differs significantly from general relativity on large (e.g.

• cosmological) scales do not typically pass local experimental tests (e.g.
• in the solar system) unless they present a suitable "screening mechanism".
• An example is provided by chameleon screening, whereby the local general relativistic behavior is recovered in high density environments, at least in weak-field and quasi-static configurations.