group2

# Differences

This shows you the differences between two versions of the page.

 group2 [2014/06/09 16:45]bartl group2 [2014/06/13 08:49] (current)bartl Both sides previous revision Previous revision 2014/06/13 08:49 bartl 2014/06/12 17:47 bartl 2014/06/11 19:56 bartl 2014/06/10 17:55 bartl 2014/06/09 16:45 bartl 2014/06/09 16:44 bartl created Next revision Previous revision 2014/06/13 08:49 bartl 2014/06/12 17:47 bartl 2014/06/11 19:56 bartl 2014/06/10 17:55 bartl 2014/06/09 16:45 bartl 2014/06/09 16:44 bartl created Line 1: Line 1: - ====== BSM BBN ====== + ====== ​$^{\rm ​BSM}_{\rm\ \ BBN}$ ====== ==== Group ==== ==== Group ==== Line 8: Line 8: ==== Task ==== ==== Task ==== We will explore the impact of non-standard model physics on BBN: We will explore the impact of non-standard model physics on BBN: - * Varying ​Λ<​sub> ​QCD​ + * Varying ​$\Lambda_{QCD}$ * Neutron magnetic moment * Neutron magnetic moment - * ... + * Variations in gravitational constant + + ==== Results ==== + For our results, please refer to our {{::​bsmbbn-presentation.pdf|final presentation}} ==== Logbook ==== ==== Logbook ==== === Monday, June 9 === === Monday, June 9 === + * decided on project topic + * started familiarizing with BBN code and researching required inputs + + === Tuesday, June 10 === + * wrote wrapper script enabling us to vary some of the constants like neutron and proton mass, gravitational constant, Hubble parameter etc. + * ran calculations of BBN dependence on grav. constant; H0 seems to be unused by the code, so varying it does not lead anywhere. + * varying $\Lambda_{QCD}$ and the neutron magnetic moment both incluence the deuteron formation rate $p(n,​\gamma)d$. Hence we rewrote this rate with parameters in the ''​bigbang.f90''​ code and [[group2_code|wrote a wrapper script]] which reads in a table with sets of parameters and calculates the BBN composition + * started figuring out how the proton-neutron mass splitting and the deuteron properties depend on our input parameters + * fixed several bugs in the code, continued familiarizing ourselves with Fortran and the BBN code + + === Wednesday, June 11 === + * produced plots of BBN abundance as function of grav. constant + * tried to calculate and fit the $p(n,​\gamma)d$ rate to use as input; partially succeeded + === Thursday, June 12 === + * produced data and plots for BBN abundance as function of $\Lambda_{QCD}$ and $\mu_n$ + * also looked at the individual effects of $\Lambda_{QCD}$ on the actual inputs to the BBN calculation (neutron-proton mass splitting, neutron life time, deuteron energy, $p(n,​\gamma)d$ rate) and identified the life time effect as the main effect driving the change in the <​sup>​4​He abundance. + * created {{::​bsmbbn-presentation.pdf|final presentation}}