group2
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group2 [2014/06/09 16:45] bartl |
group2 [2014/06/12 17:47] bartl |
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| - | ====== 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</sub> | + | * Varying $\Lambda_{QCD}$ |
| * Neutron magnetic moment | * Neutron magnetic moment | ||
| * ... | * ... | ||
| Line 14: | Line 14: | ||
| ==== 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</sup>He abundance. | ||
group2.txt · Last modified: 2014/06/13 08:49 by bartl
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