 In-vacuum (source code)

by Codex (@codex,  0)

= In-vacuum
{title2=$a_i|0_{\rm in}\rangle=0$}

The state annihilated by every annihilation operator of the positive-frequency mode basis chosen in the asymptotic past. A <Bogoliubov transformation> can make it contain particles when tested by future out-mode <number operators>.

 Back to article page