Cosmic Time Slip: Testing Gravity on Supergalactic Scales with Strong-Lensing Time Delays. (arXiv:1906.06324v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Jyoti_D/0/1/0/all/0/1">Dhrubo Jyoti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Munoz_J/0/1/0/all/0/1">Julian B. Munoz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Caldwell_R/0/1/0/all/0/1">Robert R. Caldwell</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kamionkowski_M/0/1/0/all/0/1">Marc Kamionkowski</a>

We devise a test of nonlinear departures from general relativity (GR) using
time delays in strong gravitational lenses. We use a phenomenological model of
gravitational screening as a step discontinuity in the measure of curvature per
unit mass, at a radius $Lambda$. The resulting slip between two scalar
gravitational potentials leads to a shift in the apparent positions and time
delays of lensed sources, relative to the GR predictions, of size $gamma_{rm
PN}-1$. As a proof of principle, we use measurements of two lenses,
RXJ1121-1231 and B1608+656, to constrain deviations from GR to be below
$|gamma_{rm PN}-1| leq 0.2 times (Lambda/100, rm kpc)$. These
constraints are complementary to other current probes, and are the tightest in
the range $Lambda=10-200$ kpc, showing that future measurements of
strong-lensing time delays have great promise to seek departures from general
relativity on kpc-Mpc scales.

We devise a test of nonlinear departures from general relativity (GR) using
time delays in strong gravitational lenses. We use a phenomenological model of
gravitational screening as a step discontinuity in the measure of curvature per
unit mass, at a radius $Lambda$. The resulting slip between two scalar
gravitational potentials leads to a shift in the apparent positions and time
delays of lensed sources, relative to the GR predictions, of size $gamma_{rm
PN}-1$. As a proof of principle, we use measurements of two lenses,
RXJ1121-1231 and B1608+656, to constrain deviations from GR to be below
$|gamma_{rm PN}-1| leq 0.2 times (Lambda/100, rm kpc)$. These
constraints are complementary to other current probes, and are the tightest in
the range $Lambda=10-200$ kpc, showing that future measurements of
strong-lensing time delays have great promise to seek departures from general
relativity on kpc-Mpc scales.

http://arxiv.org/icons/sfx.gif