Nucleosynthesis Without a Computer
نویسنده
چکیده
I derive completely analytically the time evolution and final abundances of the light elements (up to 7Be) formed in the big-bang nucleosynthesis.This highlights an interesting physics taking place during the formation of light elements in the early universe.
منابع مشابه
Effects of Possible Deviations of Fundamental Physical Constants on Primordial Nucleosynthesis
We study the effects of possible deviations of fundamental physical constants on the yields of light nuclides, 2 D, 3 He, 4 He, 7 Li , and others during primordial nucleosynthesis. The deviations of fundamental constants from their current values are considered in the low-energy approximation of string theories; the latter predict the existence of a scalar field, which, apart from the tensor gr...
متن کاملA SIMPLE MODEL FOR r-PROCESS SCATTER AND HALO EVOLUTION
Recent observations of heavy elements produced by rapid neutron capture (r-process) in the halo have shown a striking and unexpected behavior: within a single star, the relative abundances of r-process elements heavier than Eu are the same as the same as those of solar system matter, while across stars with similar metallicity Fe/H, the r/Fe ratio varies over two orders of magnitude. In this pa...
متن کاملNucleosynthesis in asymptotic giant branch stars
The nucleosynthesis in asymptotic giant branch stars (briefly: AGB)is a challenging and fascinating subject in the theory of stellar evolution and important for observations as well. This is because about of half the heavy elements beyond iron are synthesized during thermal pulsation phases of these stars. Furthermore, the understanding of the production of the heavy elements and some light ele...
متن کاملNucleosynthesis in evolved stars with the NACRE∗compilation
Nucleosynthesis in evolved (RGB and AGB) low-mass stars is reviewed under the light of the reaction rates recommended in the NACRE compilation (Angulo et al. 1999). We use a parametric model of stellar nucleosynthesis to investigate the uncertainties that still exist nowadays on the nuclear data and to give a critical point of view on the resulting evolution of the chemical abundances. We discu...
متن کاملNucleosynthesis of Light Elements and Heavy r-Process Elements through the ν-Process in Supernova Explosions
We study the nucleosynthesis of the light elements Li and B and the rprocess elements in Type II supernovae from the point of view of supernova neutrinos and Galactic chemical evolution. We investigate the influence of the luminosity and average energy (temperature) of supernova neutrinos on these two nucleosynthesis processes. Common models of the neutrino luminosity, which is parameterized by...
متن کامل