Raiders of the lost spacetime

@article{Wuthrich2014RaidersOT,
  title={Raiders of the lost spacetime},
  author={Christian Wuthrich},
  journal={arXiv: History and Philosophy of Physics},
  year={2014},
  volume={13},
  pages={297-335}
}
  • C. Wuthrich
  • Published 21 May 2014
  • Physics
  • arXiv: History and Philosophy of Physics
Spacetime as we know and love it is lost in most approaches to quantum gravity. For many of these approaches, as inchoate and incomplete as they may be, one of the main challenges is to relate what they take to be the fundamental non-spatiotemporal structure of the world back to the classical spacetime of general relativity (GR). The present essay investigates how spacetime is lost and how it may be regained in one major approach to quantum gravity, loop quantum gravity. 

Spacetime Quietism in Quantum Gravity

The existence and fundamentality of spacetime has been questioned in quantum gravity where spacetime is frequently described as emerging from a more fundamental nonspatiotemporal ontology. This is

The Emergence of Space and Time

  • C. Wuthrich
  • Philosophy, Physics
    The Routledge Handbook of Emergence
  • 2019
Research in quantum gravity strongly suggests that our world in not fundamentally spatiotemporal, but that spacetime may only emerge in some sense from a non-spatiotemporal structure, as this paper

Time Travelling in Emergent Spacetime

  • C. Wuthrich
  • Physics
    Hajnal Andréka and István Németi on Unity of Science
  • 2021
Most approaches to quantum gravity suggest that relativistic spacetime is not fundamental, but instead emerges from some non-spatiotemporal structure. This paper investigates the implications of this

Spacetime is as spacetime does

  • Vincent LamC. Wüthrich
  • Philosophy, Physics
    Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics
  • 2018

Quantum Gravity from General Relativity

  • C. Wuthrich
  • Physics, Philosophy
    The Routledge Companion to Philosophy of Physics
  • 2021
Although general relativity is a predictively successful theory, it treats matter as classical rather than as quantum. For this reason, it will have to be replaced by a more fundamental quantum

Philosophy Beyond Spacetime: Introduction

The present volume collects essays on the philosophical foundations of quantum theories of gravity, such as loop quantum gravity and string theory. Central for philosophical concerns is quantum

Composing Spacetime

According to a number of approaches in theoretical physics, spacetime does not exist fundamentally. Rather, spacetime exists by depending on another, more fundamental, non-spatiotemporal structure. A

The emergence of space and time

Research in quantum gravity strongly suggests that our world in not fundamentally spatiotemporal, but that spacetime may only emerge in some sense from a non-spatiotemporal structure, as this paper

The Measurement Problem for Emergent Spacetime in Loop Quantum Gravity

  • R. Healey
  • Physics
    Philosophy Beyond Spacetime
  • 2021
Any quantum theory of gravity faces the measurement problem. Carlo Rovelli sees his relational interpretation as offering a solution to this problem when applied to his favored loop quantum gravity

One time, two times, or no time?

Contemporary research programs in fundamental physics appear to suggest that there could be two (physical) times---or none at all. This essay articulates these possibilities in the context of quantum
...

References

SHOWING 1-10 OF 55 REFERENCES

Time in quantum gravity

Quantum gravity--the marriage of quantum physics with general relativity--is bound to contain deep and important lessons for the nature of physical time. Some of these lessons shall be canvassed

On the Emergence of Time in Quantum Gravity

We discuss from a philosophical perspective the way in which the normal concept of time might be said to `emerge' in a quantum theory of gravity. After an introduction, we briefly discuss the notion

A dilemma for the emergence of spacetime in canonical quantum gravity

Emergent spacetime and empirical (in)coherence

Is science without spacetime possible

Numerous approaches to a quantum theory of gravity posit fundamental ontologies that exclude spacetime, either partially or wholly. This situation raises deep questions about how such theories could

A new look at loop quantum gravity

I describe a possible perspective on the current state of loop quantum gravity, at the light of the developments in the past few years. I point out that a theory is now available, having a

Weaving a classical metric with quantum threads.

It is shown that there exist quantum states which approximate a given metric at large scales, but such states exhibit a discrete structure at the Planck scale.

Quantum Field Theory of Geometry

Over the past five years, there has been significant progress on the problem of quantization of diffeomorphism covariant field theories with {\it local} degrees of freedom. The absence of a

Quantum gravity, shadow states and quantum mechanics

A programme was recently initiated to bridge the gap between the Planck scale physics described by loop quantum gravity and the familiar low energy world. We illustrate the conceptual problems and

Modern Canonical Quantum General Relativity

This is an introduction to the by now fifteen years old research field of canonical quantum general relativity, sometimes called "loop quantum gravity". The term "modern" in the title refers to the
...