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--- 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 =====
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 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:
 $$\left(\frac{T}{T_0}\right)^3 = 1 - \left(\frac{g_\nu}{10^{-8}}\right)^2 \frac{T}{T_0}$$
+===== Preliminary Results and Presentation =====
+{{:bbnnmm.pdf|}}
+===== Revised Results and Conclusions =====
+{{:nmmabundtalent.pdf|}}

Talent