Standard Sirens as a Novel Probe of Dark Energy
| Autor: | William J. Wolf, Macarena Lagos |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
High Energy Physics - Theory
Physics Particle physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Field (physics) Gravitational wave FOS: Physical sciences General Physics and Astronomy Binary number General Relativity and Quantum Cosmology (gr-qc) Kinetic energy 01 natural sciences General Relativity and Quantum Cosmology Binary pulsar Gravitation High Energy Physics - Theory (hep-th) Pulsar 0103 physical sciences Dark energy 010306 general physics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review Letters. 124 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.124.061101 |
| Popis: | Cosmological models with a dynamical dark energy field typically lead to a modified propagation of gravitational waves via an effectively time-varying gravitational coupling $G(t)$. The local variation of this coupling between the time of emission and detection can be probed with standard sirens. Here we discuss the role that Lunar Laser Ranging (LLR) and binary pulsar constraints play in the prospects of constraining $G(t)$ with standard sirens. In particular, we argue that LLR constrains the matter-matter gravitational coupling $G_N(t)$, whereas binary pulsars and standard sirens constrain the quadratic kinetic gravity self-interaction $G_{gw}(t)$. Generically, these two couplings could be different in alternative cosmological models, in which case LLR constraints are irrelevant for standard sirens. We use the Hulse-Taylor pulsar data and show that observations are highly insensitive to time variations of $G_{gw}(t)$ yet highly sensitive to $G_N(t)$. We thus conclude that future gravitational waves data will become the best probe to test $G_{gw}(t)$, and will hence provide novel constraints on dynamical dark energy models. Comment: Updated to published version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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