First-year DESI BAO data are consistent with flat LambdaCDM and, when combined with CMB, show a 2.5-3.9 sigma preference for evolving dark energy (w0 > -1, wa < 0) that strengthens with certain supernova datasets.
Lectures on the Cosmological Constant Problem
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abstract
These lectures on the cosmological constant problem were prepared for the X Mexican School on Gravitation and Mathematical Physics. The problem itself is explained in detail, emphasising the importance of radiative instability and the need to repeatedly fine tune as we change our effective description. Weinberg's no go theorem is worked through in detail. I review a number of proposals including Linde's universe multiplication, Coleman's wormholes, the fat graviton, and SLED, to name a few. Large distance modifications of gravity are also discussed, with causality considerations pointing towards a global modification as being the most sensible option. The global nature of the cosmological constant problem is also emphasized, and as a result, the sequestering scenario is reviewed in some detail, demonstrating the cancellation of the Standard Model vacuum energy through a global modification of General Relativity.
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Post-selection on a Chern-Simons soliton in minisuperspace quantum cosmology yields an accelerating trajectory from a free radiation Hamiltonian with zero cosmological constant.
A lapse function in a 5D anisotropic gravity theory generates a global constraint that cancels Standard Model vacuum energy radiative corrections at all orders in the 4D effective theory.
A relativistic particle-scalar field system governed by the nonlinear Klein-Gordon equation exhibits no stationary zero-velocity minimum and emits waves, motivating a local vacuum hypothesis for the cosmological constant problem.
citing papers explorer
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DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
First-year DESI BAO data are consistent with flat LambdaCDM and, when combined with CMB, show a 2.5-3.9 sigma preference for evolving dark energy (w0 > -1, wa < 0) that strengthens with certain supernova datasets.
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Teleocosmology and quantum post-selection
Post-selection on a Chern-Simons soliton in minisuperspace quantum cosmology yields an accelerating trajectory from a free radiation Hamiltonian with zero cosmological constant.
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A Lapse in the Cosmological Constant Problem
A lapse function in a 5D anisotropic gravity theory generates a global constraint that cancels Standard Model vacuum energy radiative corrections at all orders in the 4D effective theory.
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On a nonlinear model of the localized vacuum hypothesis, for solving the cosmological constant problem
A relativistic particle-scalar field system governed by the nonlinear Klein-Gordon equation exhibits no stationary zero-velocity minimum and emits waves, motivating a local vacuum hypothesis for the cosmological constant problem.