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.
Pre-geometric Einstein-Cartan Field Equations and Emergent Cosmology
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abstract
The field equations of pre-geometric theories of gravity are derived and analysed, both without and with matter. After the spontaneous symmetry breaking that reduces the gauge symmetry of these theories \`a la Yang-Mills, a metric structure for spacetime emerges and the field equations recover both the Einstein and the Cartan field equations for gravity. A first exact solution of the pre-geometric field equations is also presented. This solution can be considered as a pre-geometric de Sitter universe and provides a possible resolution for the problem of the Big Bang singularity.
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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.
- Thermodynamics of homogeneous Universes: de Sitter, Bonnor-Melvin and static Einstein