Physics – Nuclear Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf...41k&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Physics
Nuclear Physics
Scientific paper
In this talk, we consider the effects on big bang nucleosynthesis (BBN) of the hadronic decay of a long-lived massive particle in supergravity. If high-energy hadrons are emitted during/after the BBN epoch (t ~ 10-2 - 1012 sec), they may change the abundances of the light elements through the destruction processes caused by such high energy hadrons, which may result in a significant discrepancy between standard BBN and observation. So far, these types of hadronic decay process in BBN have not been studied well without a few papers whose treatments were simple, because of severe shortage of hadron experimental data. However, recently the experiments of the high energy physics have been widely developed. Now we can obtain a lot of experimental informations of the hadron fragmentation in the high energy region and also simulate the process even in the higher energies where we have no experimental data by executing the numerical code of the hadron fragmentation, e.g. JETSET 7.4 Monte Carlo event generator. In addition, we have more experimental data of the hadron-nucleon cross sections. One of the candidates of the long-lived massive particle would be gravitino which appears in supergravity. If we consider general particle physics models in supergravity, it possibly decays during/after big-bang nucleosynthesis epoch. Compared with observational light element abundances, for the successful nucleosynthesis, we can obtain severe upper bound on reheating temperature after the primordial inflation which controls the primordial abundance of gravitinos. We discuss the implications of that result for cosmology, particle physics and nuclear physics.
Kawasaki Masahiro
Kohri Kazunori
Moroi Takeo
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