This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
the_nu_wgv [2014/06/18 19:08] willcox |
the_nu_wgv [2014/07/01 14:24] (current) vassh |
||
---|---|---|---|
Line 1: | Line 1: | ||
- | Members: Don Willcox, Nicole Vassh, Panos Gastis | + | ===== The $\nu$ WGV Group Members ===== |
+ | * Don Willcox (code/parameters) | ||
+ | * Nicole Vassh (parameters/analysis) | ||
+ | * Panos Gastis (code/analysis) | ||
+ | |||
+ | ===== Project Goal ===== | ||
+ | |||
+ | To examine the effect of the neutrino magnetic moment on the primordial abundances. This will be done by considering the magnetic moment as a free parameter (presumably larger than the standard model prediction). This additional magnetic moment coupling will then keep the neutrinos coupled to the electrons past the traditional $\sim 1$ MeV temperature. Here we preliminarily consider the effect on primordial abundances when the magnetic pair-production process $e^{+}+e^{-}\leftrightarrow \nu +\bar{\nu}$ is included into the big bang nucleosynthesis code of F. Timmes. | ||
===== Decoupling Temperature Calculation ===== | ===== Decoupling Temperature Calculation ===== | ||
Line 19: | Line 26: | ||
We can see that the last term is of order unity when $g_\nu\sim \frac{m_p}{M_{pl}^{1/3}M_W^{2/3}}\sim 10^{-8}$, allowing us to rewrite the equation as: | We can see that the last term is of order unity when $g_\nu\sim \frac{m_p}{M_{pl}^{1/3}M_W^{2/3}}\sim 10^{-8}$, allowing us to rewrite the equation as: | ||
$$\left(\frac{T}{T_0}\right)^3 = 1 - \left(\frac{g_\nu}{10^{-8}}\right)^2 \frac{T}{T_0}$$ | $$\left(\frac{T}{T_0}\right)^3 = 1 - \left(\frac{g_\nu}{10^{-8}}\right)^2 \frac{T}{T_0}$$ | ||
+ | |||
+ | ===== Preliminary Results and Presentation ===== | ||
+ | |||
+ | {{:bbnnmm.pdf|}} | ||
+ | |||
+ | ===== Revised Results and Conclusions ===== | ||
+ | |||
+ | {{:nmmabundtalent.pdf|}} | ||
- | ===== Link to Git Repository: ===== | + | ===== Source Code on Git Repository ===== |
* [[https://github.com/dwillcox/bbn-numu]] | * [[https://github.com/dwillcox/bbn-numu]] |