The first simultaneous measurement of Hubble constant and post-Newtonian parameter from Time-Delay Strong Lensing

Understand

Strong gravitational lensing has been a powerful probe of cosmological models and gravity.

• To date, constraints in either domain have been obtained separately.
• We propose a new methodology through which the cosmological model, specifically the Hubble constant, and post-Newtonian parameter can be simultaneously constrained.
• Using the time-delay cosmography from strong lensing combined with the stellar kinematics of the deflector lens, we demonstrate the Hubble constant and post-Newtonian parameter are incorporated in two distance ratios which reflect the lensing mass and dynamical mass, respectively.