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the_nu_wgv [2014/06/18 19:08]
willcox
the_nu_wgv [2014/07/01 14:24]
vassh
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- 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 =====
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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: 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|}}
  
  
the_nu_wgv.txt ยท Last modified: 2014/07/01 14:24 by vassh