Does Gravity Fall Down? Evidence for Gravitational Wave Deflection Along the Line of Sight to GW 170817

Abstract

We present a novel test of general relativity (GR): measuring the geometric component of the time delay due to gravitational lensing. GR predicts that photons and gravitational waves follow the same geodesic paths and thus experience the same geometric time delay. We show that for typical systems, the time delays are tens of seconds, and thus can dominate over astrophysical delays in the timing of photon emission. For the case of GW 170817, we use a multi-plane lensing code to evaluate the time delay due to four massive halos along the line of sight. From literature mass and distance measurements of these halos, we establish at high confidence (significantly greater than 5 sigma) that the gravitational waves of GW 170817 underwent gravitational deflection to arrive within 1.7 seconds of the photons.

Under review with ApJL

References in corpus (18)

• The NumPy array: a structure for efficient numerical computation
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
• A Comprehensive Analysis of Uncertainties Affecting the Stellar Mass - Halo Mass Relation for 0<z<4
• Modeling the Panchromatic Spectral Energy Distributions of Galaxies
• Strong constraints on cosmological gravity from GW170817 and GRB 170817A
• The 2MASS Redshift Survey - Description and Data Release
• Scalar-tensor theories and modified gravity in the wake of GW170817
• The Extragalactic Distance Database: Color-Magnitude Diagrams
• The Hubble flow around the CenA / M83 galaxy complex
• Satellite Kinematics II: The Halo Mass-Luminosity Relation of Central Galaxies in SDSS
• GW170817 Falsifies Dark Matter Emulators
• The 6dF Galaxy Survey: Peculiar Velocity Field and Cosmography
• A Precise Distance to the Host Galaxy of the Binary Neutron Star Merger GW170817 Using Surface Brightness Fluctuations
• Orbit-Based Dynamical Models of the Sombrero Galaxy (NGC 4594)
• Line-of-sight velocity dispersions and a mass distribution model of the Sa galaxy NGC 4594
• NGC 5084: A Massive Disk Galaxy Accreting its Satellites ?

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