On the screening mechanism in DHOST theories evading gravitational wave constraints
arXiv:1903.08399 · doi:10.1103/PhysRevD.99.104073
Abstract
We consider a subclass of degenerate higher-order scalar-tensor (DHOST) theories in which gravitational waves propagate at the speed of light and do not decay into scalar fluctuations. The screening mechanism in DHOST theories evading these two gravitational wave constraints operates very differently from that in generic DHOST theories. We derive a spherically symmetric solution in the presence of nonrelativistic matter. General relativity is recovered in the vacuum exterior region provided that functions in the Lagrangian satisfy a certain condition, implying that fine-tuning is required. Gravity in the matter interior exhibits novel features: although the gravitational potentials still obey the standard inverse power law, the effective gravitational constant is different from its exterior value, and the two metric potentials do not coincide. We discuss possible observational constraints on this subclass of DHOST theories, and argue that the tightest bound comes from the Hulse-Taylor pulsar.
6 pages, 2 figures
References in corpus (18)
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- The Confrontation between General Relativity and Experiment
- Multi-messenger Observations of a Binary Neutron Star Merger
- Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
- Dark Energy after GW170817: dead ends and the road ahead
- Strong constraints on cosmological gravity from GW170817 and GRB 170817A
- Implications of the Neutron Star Merger GW170817 for Cosmological Scalar-Tensor Theories
- Healthy theories beyond Horndeski
- Exploring gravitational theories beyond Horndeski
- Degenerate higher order scalar-tensor theories beyond Horndeski up to cubic order
- Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski
- Vainshtein mechanism after GW170817
- Modified gravity inside astrophysical bodies
- The XMM Cluster Survey: Testing chameleon gravity using the profiles of clusters
- Towards Strong Field Tests of Beyond Horndeski Gravity Theories
- Measuring Speed of Gravitational Waves by Observations of Photons and Neutrinos from Compact Binary Mergers and Supernovae
- Tracker and scaling solutions in DHOST theories
- Stellar Pulsations in Beyond Horndeski Gravity Theories
Cited by in corpus (5)
- Horndeski theory and beyond: a review
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- On the Coupling of Generalized Proca Fields to Degenerate Scalar-Tensor Theories