Hello,
I have a question, please let me have your answer, if possible:
In a space with an extra spatial dimension , where the extra coordinate is compact:
0 \le y \le 2\pi \alpha
And the metric of the space is:
{G_M}_N = \left( {\begin{array}{*{20}{c}}
{{g_\mu }_\nu (x)} & {{A_\mu }(x)}...