If Iranian cinema has a home, it’s the automobile. Like Abbas Kiarostami’s Taste of Cherry and Ten, Jafar Panahi’s Tehran Taxi, Rakhshan Bani-Etemad’s Tales, Ali Ahmadzade’s Atomic Heart is a road movie without any particular destination in mind, drifting idly through Tehran’s twilight streets, through conversations about atomic mothers and dormant dictators. But where those…