English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Current constraints on Einstein's weak equivalence principle (WEP) utilizethe observed time delay between correlated particles of astronomical sources.However, the intrinsic time delay due to particle emission time is impossibleto measure and is simply assumed to be zero in previous studies. Here wepropose a robust method to test WEP for relativistic messengers using stronglylensed cosmic transients, which can naturally overcome the intrinsic time delayproblem. This can be achieved in two ways: by comparing the time delays betweenlensed images seen in different energy bands or in gravitational waves (GWs)and their electromagnetic (EM) counterparts. The power of our method mainlydepends on the timing accuracy of cosmic transient and the strong lensing timedelay. If the time delay of cosmic transient can be measured with accuracyabout 0.1 s (e.g. gamma-ray bursts), we show that the upper limit on thedifferences of the parameterized post-Newtonian parameter $\gamma$ value is$\Delta \gamma<10^{-7}$ with a one-month strong lensing time delay event. Thisaccuracy of WEP can be improved by a factor of $10^{7}$, if the lens is galaxycluster and the strongly lensed cosmic transients have much shorter duration,such as fast radio bursts.

Testing Weak Equivalence Principle with Strongly Lensed Cosmic Transients