Selftuning and the cosmological constant problemTools Ghataore, Sukhraj Singh (2023) Selftuning and the cosmological constant problem. PhD thesis, University of Nottingham.
AbstractThe cosmological constant problem is one of the biggest theoretical hurdles of the modern age. It comes out of two great theories in physics: General Relativity (GR) and Quantum Field Theory (QFT). QFT predicts the existence of vacuum energy and GR predicts that it will gravitate like a cosmological constant, Λ_{vac}. Through observations we find that the Universe is undergoing an accelerated expansion which can be sourced by a constant term, Λ_{obs}, whose value is set by observations. Therefore it would be tempting to compare Λobs with Λ_{vac}, but through this we find that the predicted value of the vacuum energy is far, far
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