摘要 : <正> I. INTRODUCTION The phenomenon of superluminal expansion remains a puzzle for more than ten years.The maximum separated velocity is about 45 times the speed of Light. Various models have been put forward to explain the phenom... 展开 <正> I. INTRODUCTION The phenomenon of superluminal expansion remains a puzzle for more than ten years.The maximum separated velocity is about 45 times the speed of Light. Various models have been put forward to explain the phenomenon.Some of them are 收起