Length-preserving biconnection gravity and its cosmological implications

Abstract

We consider a length-preserving biconnection gravitational theory, inspired by information geometry, which extends general relativity by using the mutual curvature as the fundamental object describing gravity. The two connections used to build up the theory are the Schrödinger connection, and its dual. It can be seen that the dual of a non-metric Schrödinger connection possesses torsion, even if the Schrödinger connection itself does not, and consequently the pair $(M,g,{\nabla }^{\ast })$ is a quasi-statistical manifold. The field equations are postulated to have the form of the standard Einstein equations, but with the Ricci tensor- and scalar replaced with the mutual curvature tensor- and scalar, resulting in additional torsion-dependent terms. The covariant divergence of the matter energy-momentum does not vanish in this theory. We derive the equation of motion for massive particles, which shows the presence of an extra force. The Newtonian limit of the equations of motion is also considered. We explore the cosmological implications by deriving the generalized Friedmann equations for the FLRW geometry. They contain additional terms that can be interpreted as describing an effective, geometric type dark energy. We examine two cosmological models: one with conserved matter, and one where dark energy and pressure are related by a linear equation of state. The predictions of both models are compared with a set of observational values of the Hubble function, and with the standard $\Lambda$CDM model. Length-preserving biconnection gravity models fit well the observational data, and also align with $\Lambda$CDM at low redshifts $(z<3)$. The obtained results suggest that a modified biconnection geometry could explain the late-time acceleration, as well as the formation of the supermassive black holes, since they predict a different age of our Universe as compared to standard cosmology.

20 pages, 8 figures, matches published version

References in corpus (22)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• The Confrontation between General Relativity and Experiment
• f(R,T) gravity
• DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations
• Two new diagnostics of dark energy
• f(R,L_m) gravity
• A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
• CEERS Key Paper I: An Early Look into the First 500 Myr of Galaxy Formation with JWST
• The Expansion of the Universe is Faster than Expected
• Reionization after JWST: a photon budget crisis?
• Brief Review of Recent Advances in Understanding Dark Matter and Dark Energy
• Comparison between different methods of model selection in cosmology
• Non-metric geometry as the origin of mass in gauge theories of scale invariance
• Cosmological tests of the osculating Barthel-Kropina dark energy model
• Dark energy and accelerating cosmological evolution from osculating Barthel-Kropina geometry
• A short review on clustering dark energy
• The Basics of Information Geometry
• Spontaneous "Scalar-Vector Galileons" from "Weyl bi-Connection" model
• Weyl geometric effects on the propagation of light in gravitational fields
• Cosmological implications of the Weyl geometric gravity theory
• Schrödinger Connections: From Mathematical Foundations Towards Yano-Schrödinger Cosmology
• Bi-Connected Gauss-Bonnet Gravity

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• Cosmological test of a length-preserving biconnection gravity
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• Yano-Schrödinger Hyperfluid: Cosmological Implications