Hubble Constant, Lensing, and Time Delay in Relativistic MOND

TL;DR

This paper uses a relativistic modified gravity theory, TeVeS, to analyze gravitational lensing time delays and estimate the Hubble constant without dark matter, aligning with CMB-based cosmological models.

Contribution

It develops a formula within TeVeS for gravitational lensing time delays and applies it to real quasar lensing data to estimate the Hubble constant.

Findings

Hubble constant estimates are consistent with CMB-based models.

TeVeS can effectively model gravitational lensing without dark matter.

Method applied successfully to multiple quasar lens systems.

Abstract

Time delay in galaxy gravitational lensing systems has been used to determine the value of Hubble constant. As in other dynamical phenomena at the scale of galaxy, dark matter is often invoked in gravitational lensing to account for the "missing mass" (the apparent discrepancy between the dynamical mass and the luminous mass). Alternatively, modified gravity can be used to explain the discrepancy. In this paper we adopt the Tensor-Vector-Scalar gravity (TeVeS), a relativistic version of MOdified Newtonian Dynamics (MOND), to study gravitational lensing phenomena and derive the formulae needed to evaluate the Hubble constant. We test our method on quasar lensing by elliptical galaxies in the literature. We focus on double-image systems with time delay measurement. Three candidates are suitable for our study: HE 2149-2745, FBQ J0951+2635 and SBS 0909+532. The Hubble constant obtained is consistent with the value used in fitting the CMB result in neutrino cosmological model.