Is Quintessence the Dark Energy?

"What would be your credences that there are horrible inner experiences associated with a person who is having surgery under successfully applied general anaesthesia?" "I'd be delighted if the dark energy were a quintessence. In fact, as i previously mentioned very briefly,  if it's quintessence, that is a pseudo scaler field that could cause cosmogical by refringence," he says. 'i'm not at all convinced that string theory really is incompatible with am compact fications that give you a positive vacuum energy'