Weyl locally integrable conformal gravity, rotation curves and cosmic filaments

Abstract

Weyl's conformal theory of gravity is an extension of Einstein's theory of general relativity which associates metrics with 1-forms . In the case of locally integrable (closed non-exact) 1-forms the spacetime manifolds are no more simply connected. The Weil connections yield curvature tensors which satisfy the basic properties of Riemann curvature tensors. The Ricci tensors are symmetric, conformally invariant, and the Einstein tensors computed with the Weyl connections implicate a cosmological term replacing the cosmological constant by a function of spacetime, and a shear stress tensor. A toy model based on the Schwarzschild metric is presented where the associated 1-form is proportional to $dφ$ in Schwarzschild coordinates. This implies a singularity on the whole z-axis and it generates a torque effect on geodesics. According to initial conditions planar geodesics show almost constant velocities independently of r. In the free case spin effects occur in the neighbourhood of the singularity which are comparable to recent observations concerning cosmic filaments.