RT info:eu-repo/semantics/article
T1 Speed of gravitational waves and the fate of scalar-tensor gravity
A1 Bettoni, Dario
A1 Ezquiaga, Jose María
A1 Hinterbichler, Kurt
A1 Zumalacárregui, Miguel
A2 Didactica de la Matematica
K1 Física
K1 Gravitación
K1 Ondas gravitacionales
K1 Teorías escalar-tensoriales
K1 Gravitational waves
K1 Scalar-tensor theory
K1 2101.05 Gravitación
AB [EN] The direct detection of gravitational waves (GWs) is an invaluable new tool to probe gravity and the nature of cosmic acceleration. A large class of scalar-tensor theories predicts that GWs propagate with velocity different than the speed of light, a difference that can be O(1) for many models of dark energy. We determine the conditions behind the anomalous GW speed, namely, that the scalar field spontaneously breaks Lorentz invariance and couples to the metric perturbations via the Weyl tensor. If these conditions are realized in nature, the delay between GW and electromagnetic signals from distant events will run beyond human time scales, making it impossible to measure the speed of GWs using neutron star mergers or other violent events. We present a robust strategy to exclude or confirm an anomalous speed of GWs using eclipsing binary systems, the electromagnetic phase of which can be exquisitely determined. The white dwarf binary J0651+2844 is a known example of such a system that can be used to probe deviations in the GW speed as small as cg/c-1≳2×10-12 when LISA comes online. This test will either eliminate many contender models for cosmic acceleration or wreck a fundamental pillar of general relativity.
PB American Physical Society
SN 2470-0010
LK https://hdl.handle.net/10612/18068
UL https://hdl.handle.net/10612/18068
NO Bettoni, D., Ezquiaga, J. M., Hinterbichler, K., & Zumalacárregui, M. (2017). Speed of gravitational waves and the fate of scalar-tensor gravity. Physical Review D, 95(8), 084029.
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 20-may-2024