Xiaogang Zheng

What are

Two-point diagnostics

Omh^2(z_1,z_2)

Om(z_i,z_j)

and

and

Om(z_1,z_2)

Omh^2(z_i,z_j)

diagnostics telling us in light of

have been introduced as an interesting tool for testing the validity of the

H(z)

\Lambda

data?

CDM model. Quite recently, Sahni, Shafieloo

THE DISTANCE DUALITY RELATION FROM STRONG GRAVITATIONAL LENSING

\&

Ultra-compact structure in intermediate-luminosity radio quasars: building a sample of standard cosmological rulers and improving the dark energy constraints up to z ~ 3

Starobinsky (2014) combined two independent measurements of

Measuring the speed of light with ultra-compact radio quasars

H(z)