而非状态数本身。第9章中我们还讲了一个类似的关于信息的故事：香.3
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致谢
一本书从有想法到最终出版，是个非常需要通力合作的过程。这一
路走来，也确实有很多人给我提供了莫大帮助，值得特别感谢。这本书
还在雏形中的时候，我三生有幸遇到了一个人，她恰好也是一位天才的
科普作家；我跟她坠入爱河，并最终喜结连理。最诚挚的谢意献给珍妮
弗·韦莱（Jennifer Ouellette），是她让这本书从泥土变成珍珠，也让这
段旅程变得极有价值。
我把本书手稿发给了很多朋友，他们则回以令人击节赞赏的幽默和
令人面红耳赤的合理建议，使本书大为增色。感谢斯科特·阿伦森
（Scott Aaronson）、阿莉森·比阿特丽斯（Allyson Beatrice）、陈千
颖、斯蒂芬·弗勒德（StephenFlood）、戴维·格雷（DavidGrae）、劳伦·
冈德森（Lauren Gunderson）、罗宾·汉森（Robin Hanson）、马修·约翰
逊（Matthew Johnson）、克里斯·拉克纳（ChrisLackner）、汤姆·利文森
（Tom Levenson）、卡伦·洛尔（Karen Lorre）、乔治·马瑟（George
Musser）、休·普赖斯（HuwPrice）、特德·派恩（TedPyne）、玛丽·鲁
蒂（Mari
Ruti）、亚历山大·辛格（Alex
Singer）以及马克·特罗登
（Mark Trodden）等，是他们让我这一路上都能保持坦率。我怀疑他们
中很多人很快会有自己的著作，我将很高兴读到他们的作品。
多年以来，我一直在跟科学同行一起讨论时间之箭以及本书包含的
其他问题，不可能还分得清谁对我的想法具体做出了什么贡献。除了上
面提到的诸位读者，我还想感谢多年来和我促膝长谈过的安东尼·阿吉
雷、大卫·艾伯特、安德烈亚斯·阿尔布雷克特、汤姆·班克斯（Tom
Banks）、拉斐尔·布索、爱德华·法里、布莱恩·格林、吉姆·哈特尔
（Jim Hartle）、库尔特·欣特毕可勒（Kurt Hinterbichler）、托尼·莱格
特（Tony Leggett）、安德烈·连德、劳拉·梅尔西尼（LauraMersini）、
肯·奥鲁姆、唐·佩奇（DonPage）、约翰·普瑞斯基尔、伊格纳齐·萨维茨
基（Ignacy Sawicki）、科思马·沙利奇（Cosma Shalizi）、马克·斯雷德
尼基（Mark Srednicki）、基普·索恩、亚历山大·维连金及罗伯特·沃尔
德等（还有另外一些毫无疑问不应该遗忘的人）。我还想特别感谢陈千
颖，她不只是仔细阅读过本书手稿，在我刚开始认真考虑时间之箭的问
题时，也是一位举世无双的合作伙伴。
最近我自己倒一直很漫不经心，埋头于本书写作中时，我的同僚在
我们所研究的主题上取得了长足进步。我要向以下人员致谢并致歉：洛
蒂·阿克曼（Lotty Ackerman）、马特·巴克利（Matt Buckley）、克劳迪
娅·德·拉姆（Claudia de Rham）、蒂姆·杜拉尼（Tim Dulaney）、阿德
里安娜·埃里切克（Adrienne
Erickcek）、莫伊拉·格雷沙姆（Moira
Gresham）、马特·约翰逊、马克·卡米翁可夫斯基（Marc
Kamionkowski）、桑尼·曼特（Sonny Mantry）、迈克尔·拉姆齐-穆索尔
夫（Michael Ramsey-Musolf）、丽莎·兰道尔、海伍德·塔姆（Heywood
Tam）、Chien-Yao Tseng、因贡·韦弗斯（Ingunn Wehus）及马克·怀斯
（Mark Wise），近来当我的注意力无法完全集中在手头的任务上时，
是你们包容了我。
凯廷卡·马特森（Katinka
Matson）和约翰·布罗克曼（John
Brockman）帮助我将刚开始的模糊想法变成了清晰的一本书的思路，对
本书成稿也助力甚多。我在开始构思本书之前很久就认识我的编辑斯蒂
芬·莫罗（Stephen Morrow）了，有机会跟他共事实在是莫大荣幸。贾森
·托尔钦斯基（Jason Torchinsky）将我蹩脚的草图变成了魅力无穷的插
图。在埃利奥特·塔拉波尔（Elliot Tarabour）的居中协调之下，迈克尔·
贝吕贝（Michael
Bérubé）在本书成稿之前就撰写了一篇给本书的评
论。对讨论时间性质的著作来说，我们还能期待什么呢？
我是那种在家里或办公室里坐久了就会如坐针毡的人，所以我经常
会拿起我的物理书和论文去一家餐馆或咖啡厅，换换环境。几乎总是会
有陌生人问我在看什么，并且在令人望而生畏的数学和科学面前，不乏
没被吓倒，反而继之提出更多关于宇宙学、量子力学乃至宇宙本身的问
