Tuesday, June 05, 2007 ... Deutsch/Español/Related posts from blogosphere

Heterotic landscape: gauge coupling unification statistics

Raby and Wingerter have performed an interesting poll of heterotic orbifold vacua. 12% of their vacua have $\sin^2 \theta_W = \frac 38$ while none of them exceeds this value. $\frac 38$ is an upper bound! Among those that saturate the bound, 89% embed the hypercharge within an SU(5) group and can thus be interpreted as SU(5) GUT models.

I personally don't think that vacua that belong to a certain minority are excluded. On the other hand, if there were a plausible argument - supported by some experimental data - that some numbers always satisfy some inequality, like that $\frac 38$ is the maximum value of $\sin^2 \theta_W$, then it could be viewed as an insight.

Add to del.icio.us Digg this Add to reddit

snail feedback (0) :

(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-1828728-1', 'auto'); ga('send', 'pageview');