### "Physics Meets Philosophy at the Planck Scale"

Here's a collection of links to chapters of the book "Physics Meets Philosophy at the Planck Scale", edited by Nick Huggett and Craig Callender. These sources are all already available publicly - I'm just collecting the links in one convenient place. Not all the chapters are available, but I'll add them as and when I find them. Of course, if you like the chapters you read, and you'd like to see the rest, a good way to get them would be to buy the book.

**Preface**

1

*Introduction*Web page PDF

Craig Callender and Nick Huggett

**Part I: Theories of Quantum Gravity and their Philosophical Dimensions**

2

*Spacetime and the philosophical challenge of quantum gravity*Web page PDF

Jeremy Butterfield and Christopher Isham

3

*Naive quantum gravity*Web page PDF

Steven Weinstein

4

*Quantum spacetime:What do we know?*Web page PDF

Carlo Rovelli

**Part II: Strings**

5

*Reflections on the fate of spacetime*

Edward Witten

6

*A philosopher looks at string theory*

Robert Weingard

7

*Black holes, dumb holes, and entropy*

William G. Unruh

**Part III: Topological Quantum Field Theory**

8

*Higher-dimensional algebra and Planck scale physics*Web page

John C. Baez

**Part IV: Quantum Gravity and the Interpretation of General Relativity**

9

*On general covariance and best matching*

Julian B. Barbour

10

*Pre-Socratic quantum gravity*PDF

Gordon Belot and John Earman

11

*The origin of the spacetime metric: Bell's "Lorentzian pedagogy" and its significance in general relativity*Web page PDF

Harvey R. Brown and Oliver Pooley

**Part V: Quantum Gravity and the Interpretation of Quantum Mechanics**

12

*Quantum spacetime without observers: Ontological clarity and the conceptual foundations of quantum gravity*Web page PDF

Sheldon Goldstein and Stefan Teufel

13

*On gravity's role in quantum state reduction*

Roger Penrose

14

*Why the quantum must yield to gravity*Web Page PDF

Joy Christian