Updated exclusion contours on lifetime, mass and abundance of decaying BSM relics from refined BBN modeling of hadronic and electromagnetic injections across multiple two-body channels.
Primordial Nucleosynthesis: from precision cosmology to fundamental physics
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abstract
We present an up-to-date review of Big Bang Nucleosynthesis (BBN). We discuss the main improvements which have been achieved in the past two decades on the overall theoretical framework, summarize the impact of new experimental results on nuclear reaction rates, and critically re-examine the astrophysical determinations of light nuclei abundances. We report then on how BBN can be used as a powerful test of new physics, constraining a wide range of ideas and theoretical models of fundamental interactions beyond the standard model of strong and electroweak forces and Einstein's general relativity.
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Extending a BBN code yields constraints Δα/α = 2 ± 51 ppm (mass variation) and 2 ± 22 ppm (G variation) at 68% CL, showing these models do not solve the lithium problem.
Updated bounds on constant and redshift-dependent neutrino degeneracy parameters are derived from Planck+SPT+ACT CMB, DESI BAO, and BBN data, with a reported 95% CL preference for non-zero positive ξ_νe at BBN in the non-degenerate scenario.
citing papers explorer
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Improved Big Bang Nucleosynthesis constraints on decaying massive relics
Updated exclusion contours on lifetime, mass and abundance of decaying BSM relics from refined BBN modeling of hadronic and electromagnetic injections across multiple two-body channels.
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Probing Unification Scenarios with Big Bang Nucleosynthesis
Extending a BBN code yields constraints Δα/α = 2 ± 51 ppm (mass variation) and 2 ± 22 ppm (G variation) at 68% CL, showing these models do not solve the lithium problem.
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Probing the neutrino chemical potential with cosmological observations
Updated bounds on constant and redshift-dependent neutrino degeneracy parameters are derived from Planck+SPT+ACT CMB, DESI BAO, and BBN data, with a reported 95% CL preference for non-zero positive ξ_νe at BBN in the non-degenerate scenario.
- Intertwined Constraints in Extended Cosmologies: Dark Energy, Curvature, Neutrinos, and Inflation