A quadratic extension of pre-geometric gravity yields a gravi-axion that naturally realizes dynamical dark energy and fits DESI observations with chi-squared_red = 1.394.
Hamiltonian Analysis of Pre-geometric Gravity
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abstract
The Einstein-Cartan theory of gravity can arise from a mechanism of spontaneous symmetry breaking within the context of pre-geometric gauge theories. In this work, we develop the Hamiltonian analysis of such theories. By making contact with the ADM formalism, we show that all the results of canonical General Relativity are correctly recovered in the IR limit of the spontaneously broken phase. We then apply Dirac's algorithm to study the algebra of constraints and determine the number of degrees of freedom in the UV limit of the unbroken phase. We also discuss possible pathways toward a UV completion of General Relativity, including a pre-geometric generalisation of the Wheeler-DeWitt equation and an extended BF formulation of the pre-geometric theory.
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DESI and Dynamical Dark Energy from Extended Pre-geometric Gravity
A quadratic extension of pre-geometric gravity yields a gravi-axion that naturally realizes dynamical dark energy and fits DESI observations with chi-squared_red = 1.394.