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This work explores the conditions needed for gravitational baryogenesis to achieve observed baryon asymmetry during a kination phase.

August 12, 2026Open Access

Gravitational Baryogenesis during Kination: A Degeneracy Bound from Tensor and Dark-Radiation Constraints

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This work explores the conditions needed for gravitational baryogenesis to achieve observed baryon asymmetry during a kination phase.
Derived necessary conditions on model quantities and observational thresholds for baryon asymmetry.
Utilized general relativity principles to establish relationships between different parameters.
Applied a combination of observational constraints to formulate a degeneracy bound.
Established a necessary condition on a product of model quantities for baryon number preservation.
Found that under certain parameters, gravitational baryogenesis can yield at most 55% of the observed baryon asymmetry.
Proposed that wrong exponents in the model lead to failure in observed outcomes.

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Randomized trial examines baryon asymmetry in kination, suggesting necessary conditions for compliance.

Lukas Geiger (2026) studied this question.

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