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$^{\rm BSM}_{\rm\ \ BBN}$


  • Ermal (parameter)
  • Jianping (analysis)
  • Alex B. (code)


We will explore the impact of non-standard model physics on BBN:

  • Varying $\Lambda_{QCD}$
  • Neutron magnetic moment


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 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
group2.1402437347.txt.gz · Last modified: 2014/06/10 17:55 by bartl