Local Supervoid RSFP

The Local Supervoid is a large underdensity region centered roughly on our Local Group of galaxies, with a scale of approximately 150-250 million light-years. This structure is problematic for Lambda-CDM cosmology because our location within such a significant void is statistically improbable if the universe is homogeneous on large scales as inflation predicts. The existence of the Local Supervoid creates tension with the cosmological principle (the assumption that we do not occupy a special location in the universe) and raises questions about whether our measurements of cosmic expansion and other fundamental parameters are biased by our position within this underdensity. The Raychaudhuri equation in SCT frameworks and field perturbation analysis suggest that such large local voids should be extremely rare given standard initial conditions (Keenan et al. 2013; Whitbourn and Shanks 2014).

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