Opening Friday, “Black Swan” is so haunting, so engrossing, you might be tempted to invest it with more meaning than it warrants. With its über-creepy shock effects, swirling camerawork and Oscar-caliber performance by Natalie Portman (“Brothers”), the psychological thriller directed by Darren Aronofsky (“The Wrestler”) is a ballet/showbiz picture awash in LSD. It’s trashiness masquerading […]