Is Casmer Energy a Quant Theory Effect?

Theories with a gravaton and therefore general relativity. The location of every point along the string is a quantum field in the one sone dimensional theory of the string world sheet. Anomalies are a big deal. You have to cancel themd. And so, you know, so it's an exciting thing that that the the few possibilities not only include, but insist on theories with a a gravaton or something like that.