An inhomogeneous Lemaitre model with a space-dependent cosmological constant and a unified dark fluid can reproduce the local and early-universe Hubble constants and generates testable predictions for expansion rates and redshift drift.
Gravitational Lensing in Spherically Symmetric Spacetimes
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We present a framework for studying gravitational lensing in spherically symmetric spacetimes using 1+1+2 covariant methods. A general formula for the deflection angle is derived and we show how this can be used to recover the standard result for the Schwarzschild spacetime.
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Inhomogeneous model with a space dependent Cosmological Constant
An inhomogeneous Lemaitre model with a space-dependent cosmological constant and a unified dark fluid can reproduce the local and early-universe Hubble constants and generates testable predictions for expansion rates and redshift drift.