i Philosophy of Time As a growing area of research, the philosophy of time is increasingly relevant to different areas of philosophy and even other disciplines. This book describes and evaluates the most important debates in philosophy of time, under several subject areas: metaphysics, epistemology, physics, philosophy of language, phil- osophy of mind, cognitive science, rationality, and art. Questions this book investigates include the following. Can we know what time really is? Is time possible, especially given modern physics? Must there be time because we cannot think without it? What do we experience of time? How might philosophy of time be relevant to understanding the mind– body rela- tionship or evidence in cognitive science? Can the philosophy of time help us understand biases toward the future and the fear of death? How is time relevant to art— and is art relevant to philosophical debates about time? Finally, what exactly could time travel be? And could time travel satisfy emotions such as nos- talgia and regret? Through asking such questions, and showing how they might be best answered, the book demonstrates the importance philosophy of time has in contemporary thought. Each of the book’s ten chapters begins with a helpful introduction and ends with study questions and an annotated list of further reading. This and a comprehensive bibliography at the end of the book prepare the reader to go fur- ther in their study of the philosophy of time. Sean Enda Power is Postdoctoral Researcher in the Department of Philosophy at University College Cork, Ireland. He has authored, among other work, The Philosophy of Time and Perceptual Experience (Routledge, 2018) and has co-e dited The Illusions of Time (2019). He is a previous Irish Research Council Postdoctoral Fellow and a previous Visiting Fellow at the Centre for Time, University of Sydney. ii Routledge Contemporary Introductions to Philosophy Series editor: Paul K. Moser, Loyola University of Chicago This innovative, well- structured series is for students who have already done an introductory course in philosophy. Each book introduces a core general sub- ject in contemporary philosophy and offers students an accessible but substan- tial transition from introductory to higher-l evel college work in that subject. The series is accessible to non- specialists and each book clearly motivates and expounds the problems and positions introduced. An orientating chapter briefly introduces its topic and reminds readers of any crucial material they need to have retained from a typical introductory course. Considerable attention is given to explaining the central philosophical problems of a subject and the main com- peting solutions and arguments for those solutions. The primary aim is to edu- cate students in the main problems, positions and arguments of contemporary philosophy rather than to convince students of a single position. Recently Published Volumes: Philosophy of Western Music Andrew Kania Phenomenology Walter Hopp Philosophical Logic John MacFarlane Philosophy of Action Sarah K. Paul Animal Ethics Bob Fischer Philosophy of Time Sean Enda Power For a full list of published Routledge Contemporary Introductions to Philosophy, please visit www.routledge.com/ Routledge- Contemporary- Introductions- to- Philosophy/ book- series/ SE0111 iii Philosophy of Time A Contemporary Introduction Sean Enda Power iv First published 2021 by Routledge 605 Third Avenue, New York, NY 10158 and by Routledge 2 Park Square, Milton Park, Abingdon, Oxon OX14 4RN Routledge is an imprint of the Taylor & Francis Group, an informa business © 2021 Taylor & Francis The right of Sean Enda Power to be identified as author of this work has been asserted by him accordance with sections 77 and 78 of the Copyright, Designs and Patents Act 1988. All rights reserved. No part of this book may be reprinted or reproduced or utilised in any form or by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying and recording, or in any information storage or retrieval system, without permission in writing from the publishers. Trademark notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation without intent to infringe. Library of Congress Cataloging- in- Publication Data A catalog record for this title has been requested ISBN: 978- 1- 138- 24048- 3 (hbk) ISBN: 978- 1- 138- 24049- 0 (pbk) ISBN: 978- 1- 315- 28361- 6 (ebk) Typeset in Times New Roman by Newgen Publishing UK v Contents List of Figures xiv Preface xv About This Book xvi Acknowledgements xix 1 Epistemology of Time 1 Overview 1 Introduction 2 Theoretical Time Is Not Folk Time 3 A World Without Time Is Not a World We Understand 4 Folk Time 5 Objects and Events 7 Temporal Properties and Relations 8 Independent Time 9 Substantivalism 9 Relationalism 10 Objection: A Frozen World Is Possible 11 Objection: We Can Have Indirect Knowledge of Substantival Time 12 Frozen Worlds 12 Objection 1: We Do Not Know There Is a Global Freeze (Other Explanations Available) 15 Response: Inference to the Simplest Explanation 15 Objection 2: Time in an Unchanging World Still Needs the World 15 Objection 3: Shoemaker-S tyle Arguments Do Not Suit Lived Experience 16 Scepticism about Time 17 Kant’s Antinomies 17 Thesis: Time Has a Beginning 18 Antithesis: Time Has No Beginning 18 Elapsing Time and Temporal Passage 19 Idealism or Scepticism? 19 Sextus Empiricus 20 Scepticism about Change 21 Objection: This Argument Is Against the Reality of Change 21 vi vi Contents Against Time’s Divisibility or Indivisibility 22 The Argument Against Time as Past, Present, and Future 23 Objection 1: We Cannot Suspend Beliefs about Time 24 Objection 2: Scepticism Depends on One’s Metaphysics of Time 24 Knowledge of Time through Perception 25 The Causal Truth-Maker Principle 25 Temporal Order Cannot Cause Belief 26 Study Questions 27 Suggested Readings 28 2 Metaphysics of Time I: Time and Change 29 Overview 29 Introduction 30 McTaggart’s Paradox 31 The Two Main Concepts of Events in Time 31 A- Series 32 B- Series 32 McTaggart’s Argument 33 Solution 1: A- Series Positions Are Determined by B- Series Positions 36 Indexicals 36 Objection: The B- Series Is Not Enough for Change 38 Objection 1: The B- Series Does Not Provide Real A- Series Positions 38 Objection 2: The B- Series Does Not Capture Real Change 38 Motion and A- Series Change 39 Indexical A- Series Change 40 Objection: This Is Not Real Change 40 Analogy between a Fundamental A- Series and Absolute Space 41 Tense Theory 42 Temporal Passage 42 The Unique and Real Present 43 Real Present and Temporal Passage 43 Real Present and the Real A- Series 44 Time Defined by Events and a Static A- Series 44 Kinds of Tense Theory 45 Presentism 45 Presentism Is Intuitive 46 Presentism Solves McTaggart’s Paradox 47 Objection 1: No Real A- Series 48 Objection 2: Presentism Lacks Truth- Makers for Truths about the Past 48 Objection 3: Presentism and Physics 50 Eternalism 50 The “Moving Spotlight” 50 Objection: Events Must Change 51 The Growing Block Theory 51 vii Contents vii Tenseless Theory 52 Change, Static and Dynamic 53 R- Theory 55 Study Questions 56 Suggested Readings 56 3 Metaphysics of Time II: Change and Persistence in Objects 58 Overview 58 Introduction 59 Concrete Particulars 59 An Object Exists in Space 61 Spatial Parts 62 An Object Exists in Time 62 An Object Persists 63 Endurantism: An Object is at Each Time it Persists 63 Being Wholly Present 64 Objection: Endurantism Has No Spatial Analogue 65 The Persistence of Objects through Change 65 Hinchliff’s Four Conditions of Change 66 Objection: There Is No Analogy for Specific Properties 67 Leibniz’ Law 68 Numerical Identity 69 Relations-t o- Times: Temporal Location Is Not a Property 70 Adverbialism 71 The Problem of Temporary Intrinsics 72 Intrinsic Properties 73 Temporary Intrinsic Properties 74 Endurantism 74 Relations-t o- Times and Adverbialism 75 Temporal Parts: A Different Object is at Each Time an Object Persists 76 Objection: Objects Are Continuants 77 Response 1: An Object Can Have Infinite Parts 77 Response 2: This Objection Requires Continuous Time 78 Perdurance: The Ordinary Object Is the Persisting Object 78 Exdurantism (Stage Theory): The Ordinary Object Is the Object at Each Time 79 Intuitions about Persistence 81 Study Questions 82 Suggested Readings 83 4 Philosophy of Physics and Time 84 Overview 84 Introduction 85 Physics Without Time 86 Substantivalism and Early Physics 87 Relative Simultaneity 88 viii viii Contents Relative Frames 88 Relative Is Neither Private Nor Subjective 90 Relative Time 91 The Constant Speed of Light 91 Inertial Frames 94 Possible Absolute Simultaneity and Temporal Order 94 Minkowski Space- Time 95 Relative Temporal Order 96 STR and Relative Temporal Order 98 Objection: There Is Absolute Temporal Order in STR 99 Response: Not All Earlier Events Are Causally Related to Later Events 99 Causal Order and Perceived Temporal Order 99 Causal Order and the Intuition of Temporal Order 101 Backwards Causation 102 Entropy 103 Bardon’s Entropy Account of Perception 104 Objections to Relative Time 107 Bergson’s Objections to Relative Time 107 Objection 1: Real Time Is Continuous 107 Objection 2: Relative Time Is Merely Imagined Time 108 Objection 3: Experienced Time Requires Absolute Time 109 Tense Theory Objections 110 Tense Theory and Temporal Order 111 Tense Theory and Relative Simultaneity 112 Presentism 112 Privileged Frames of Reference 113 The Ether 113 Objection: We Cannot Detect the Privileged Frame 114 Tenseless Theory 116 Study Questions 117 Suggested Readings 118 5 Philosophy of Language and Time 119 Overview 119 Time and the Linguistic Turn 120 Metaphors of Temporal Passage 122 Objection: Metaphors of Passage Have Meaning 123 Merely Apparent Metaphysical Meaning 124 Modifiers 125 Temporal Properties of Linguistic Expressions 126 Tokens 127 Propositions 128 Changing Propositional Truth- Values 129 Truth- Makers and Facts 130 Truth- Makers for Propositional Variation in Truth- Value 130 ix Contents ix Objection: Propositions Are Abstract and Not in Time 132 Truth- Makers and Tokens 132 Implicit Context 133 Token- Reflexive Truth- Conditions 133 Linguistic Responses to McTaggart’s Paradox 135 Irreducible Tense 137 Tense Language and Tokens 137 Objection 1: Propositions Cannot Change Truth- Value in Tense Theory 138 Response: Tense is a Modifier 139 Objection 2: Tense Tokens Are Not Merely Linguistic Entities 140 Response: The Tokens Only Undermine Mere Linguistic Solutions 140 Tenseless Facts 140 Objection: Some Tensed Propositions Cannot Have Tokens 142 Response: Date- Reflexive Theory 143 Tense Logic 144 Logical Operators and Truth- Value 144 Tense Logic and the Metaphysics of Time 145 Objection 1: We Talk as if Tense are Properties, Locations, or Facts 145 Objection 2: Tense Logic Assumes Presentism 146 Objection 3: Tense Operators Do Not Need an Unreal Past and Future 146 Study Questions 148 Suggested Readings 148 6 Philosophy of Mind and Time 150 Overview 150 Introduction 151 Time is Only in the Mind: St Augustine’s Argument 152 Objection 1: Time Is Unreal Not Mind- Dependent 153 Objection 2: The Past and Future Are Real 154 Objection 2: The Present Can Have Duration 154 Tense Theory 154 Tenseless Theory 155 Temporal Experience 157 The Appearance of Time in the World 158 Time We Do Not Experience 158 Time We Do Experience 159 Objection: Time- Lag 160 Response: Apparent Time 161 Apparent Reality 161 Phenomenological Presentism 161 Appearance of Actual Times 162 Duration 163 Temporal Order 163 Experiences of Change 164