# Gravitational waves and geometrical optics in scalar-tensor theories

@article{Garoffolo2019GravitationalWA, title={Gravitational waves and geometrical optics in scalar-tensor theories}, author={Alice Garoffolo and Gianmassimo Tasinato and Carmelita Carbone and Daniele Bertacca and Sabino Matarrese}, journal={Journal of Cosmology and Astroparticle Physics}, year={2019}, volume={2020}, pages={040 - 040} }

The detection of gravitational waves (GWs) propagating through cosmic structures can provide invaluable information on the geometry and content of our Universe as well as on the fundamental theory of gravity. In order to test possible departures from General Relativity, it is essential to analyze, in a modified gravity setting, how GWs propagate through a perturbed cosmological space-time. Working within the framework of geometrical optics, we develop tools to address this topic for a broad…

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## References

SHOWING 1-10 OF 139 REFERENCES

### Quantum gravity and gravitational-wave astronomy

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2019

We investigate possible signatures of quantum gravity which could be tested with current and future gravitational-wave (GW) observations. In particular, we analyze how quantum gravity can influence…

### Gravitational lensing beyond geometric optics: II. Metric independence

- Physics, GeologyGeneral Relativity and Gravitation
- 2019

Typical applications of gravitational lensing use the properties of electromagnetic or gravitational waves to infer the geometry through which those waves propagate. Nevertheless, the optical fields…

### Testing modified gravity at cosmological distances with LISA standard sirens

- PhysicsJournal of Cosmology and Astroparticle Physics
- 2019

Modifications of General Relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the evolution of cosmological perturbations in…

### Dark Energy in Light of Multi-Messenger Gravitational-Wave Astronomy

- PhysicsFront. Astron. Space Sci.
- 2018

Gravitational waves (GWs) provide a new tool to probe the nature of dark energy (DE) and the fundamental properties of gravity. We review the different ways in which GWs can be used to test gravity…

### Breaking a dark degeneracy with gravitational waves

- Physics
- 2015

We identify a scalar-tensor model embedded in the Horndeski action whose cosmological background and linear scalar fluctuations are degenerate with the concordance cosmology. The model admits a…

### Generalized framework for testing gravity with gravitational-wave propagation. III. Future prospect

- PhysicsPhysical Review D
- 2019

The direct detection of gravitational waves (GW) from merging binary black holes and neutron stars mark the beginning of a new era in gravitational physics, and it brings forth new opportunities to…

### Gravitational wave propagation beyond geometric optics

- PhysicsPhysical Review D
- 2020

It is standard practice to study the lensing of gravitational waves (GW) using the geometric optics regime. However, in many astrophysical configurations this regime breaks down as the wavelength…

### Gravitational Radiation in the Limit of High Frequency. I. The Linear Approximation and Geometrical Optics

- Physics
- 1968

A formalism is developed for obtaining approximate gravitational wave solutions to the vacuum Einstein equations of general relativity in situations where the gravitational fields of interest are…