Details

Autor(en) / Beteiligte

• Nishizawa, Atsushi
• Kobayashi, Tsutomu

Titel

Parity-violating gravity and GW170817

Ist Teil von

• Physical review. D, 2018-12, Vol.98 (12), p.1, Article 124018

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We consider gravitational waves (GWs) in generic parity-violating gravity, including recently proposed ghost-free theories with parity violation as well as Chern-Simons (CS) modified gravity, and study the implications of observational constraints from GW170817/GRB 170817A. Whereas GWs propagate at the speed of light, c , in CS gravity, we point out that this is specific to CS gravity and the GW propagation speed deviates from c , in general, in parity-violating gravity. Therefore, contrary to the previous literature in which only CS gravity is studied as a concrete example, we show that GW170817/GRB 170817A can, in fact, be used to limit gravitational parity violation. Our argument implies that the constraint on the propagation speed of GWs can pin down the parity-violating sector, if any, to CS gravity.