Emergent gravity fails to explain color-dependent galaxy-galaxy lensing signals from SDSS Dr7

Understand

We test the Emergent Gravity(EG) theory using the galaxy-galaxy lensing technique based on SDSS DR7 data.

• In the EG scenario, we do not expect color dependence of the galaxy sample in the 'apparent dark matter' predicted by EG, which is exerted only by the baryonic mass.
• If the baryonic mass is similar, then the predicted lensing profiles from the baryonic mass should be similar according to the EG, regardless of the color of the galaxy sample.
• We use the stellar mass of the galaxy as a proxy of its baryonic mass.