Hawking doesn’t discover a unified equation, but he settles for black holes and a comprehensive and remarkably lucrative obsession with time. (“A Brief History of Time” has sold more than ten million copies worldwide.) The movie is a love story and a success story, ending with Hawking’s refusal of a knighthood from Queen Elizabeth, for reasons that aren’t explained. His relationships with women in general here are baffling. We’re puzzled by the black hole in his character that causes him, after twenty-five years of loving marriage, to leave the devoted, accomplished, and beautiful Jane for a young nurse (Maxine Peake) who treats him like a baby, and dominates him. After one brief outburst, Jane doesn’t protest but happily escapes into the arms of a strapping but gentle choirmaster (Charlie Cox). So we have to do a little speculating ourselves: Did Jane want to get out of the marriage? Or did she suppress an entirely understandable rage in order to keep the portrait of the marriage as pleasant (and salable) as possible? “The Theory of Everything” makes a pass at the complexities of love, but what’s onscreen requires a bit more investigation.