Big-Bang Nucleosynthesis and Hadronic Decay of Long-Lived Massive Particles
read the original abstract
We study the big-bang nucleosynthesis (BBN) with the long-lived exotic particle, called X. If the lifetime of X is longer than \sim 0.1 sec, its decay may cause non-thermal nuclear reactions during or after the BBN, altering the predictions of the standard BBN scenario. We pay particular attention to its hadronic decay modes and calculate the primordial abundances of the light elements. Using the result, we derive constraints on the primordial abundance of X. Compared to the previous studies, we have improved the following points in our analysis: The JETSET 7.4 Monte Carlo event generator is used to calculate the spectrum of hadrons produced by the decay of X; The evolution of the hadronic shower is studied taking account of the details of the energy-loss processes of the nuclei in the thermal bath; We have used the most recent observational constraints on the primordial abundances of the light elements; In order to estimate the uncertainties, we have performed the Monte Carlo simulation which includes the experimental errors of the cross sections and transfered energies. We will see that the non-thermal productions of D, He3, He4 and Li6 provide stringent upper bounds on the primordial abundance of late-decaying particle, in particular when the hadronic branching ratio of X is sizable. We apply our results to the gravitino problem, and obtain upper bound on the reheating temperature after inflation.
This paper has not been read by Pith yet.
Forward citations
Cited by 6 Pith papers
-
Inflaton Regeneration via Scalar Couplings: Generic Models and the Higgs Portal
For monomial inflationary potentials with k≥4, the inflaton regenerates from the thermal bath after reheating because its amplitude-dependent mass vanishes asymptotically.
-
Gauged Flavour for Asymmetric Dark Matter
A gauged SO(3) flavour symmetry spontaneously broken at multiple scales links SM flavour hierarchies to asymmetric dark matter via leptogenesis and sphaleron redistribution, with DM as bound states of a confining SU(3).
-
Monochromatic neutrinos from scotogenic dark matter
A modified scotogenic model makes the lightest pseudo-Dirac singlet a dark matter candidate that annihilates mostly to neutrino pairs near threshold, reproducing the relic abundance while satisfying direct detection a...
-
Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look
Updated model-independent BBN and CMB bounds on photophilic ALPs that incorporate rare decays to light hadrons, show extended constraints for multiple reheating temperatures, and flag parameter space that may alleviat...
-
Monochromatic neutrinos from scotogenic dark matter
A variation of the scotogenic model makes the lightest pseudo-Dirac fermion singlet a dark matter candidate that annihilates with 90% branching ratio into neutrino pairs near threshold, yielding the observed relic abu...
-
Constraints on Primordial Black Holes
Updated compilation shows PBHs are tightly constrained across 55 orders of magnitude in mass, ruling out dominant dark matter contributions except in narrow windows, with many limits carrying observational uncertainties.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.