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group2 [2014/06/09 16:45] bartl |
group2 [2014/06/13 08:49] (current) bartl |
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- | ====== BSM BBN ====== | + | ====== $^{\rm BSM}_{\rm\ \ BBN}$ ====== |
==== Group ==== | ==== Group ==== | ||
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==== 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 | ||
- | * ... | + | * 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</sup>He abundance. | ||
+ | * created {{::bsmbbn-presentation.pdf|final presentation}} |