Abstract
Time reversal is a wonderfully strange concept. It sounds like science fiction at first blush, and yet plays a substantial role in the foundations of physics. For example, time reversal is often used to describe the “arrow of time,” by allowing one to say how evolving to the future is different from evolving to the past. This chapter introduces one little corner of the rich literature on time reversal, which deals with the question of what time reversal means. It begins with a presentation of the standard account of time reversal, with plenty of examples, followed by a popular non-standard account. The chapter argues that, in spite of recent commentary to the contrary, the standard approach to the meaning of time reversal is the only one that is philosophically and physically viable. Then the chapter concludes with a few open research problems about time reversal.
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