# One time, two times, or no time?

@article{Wuthrich2020OneTT, title={One time, two times, or no time?}, author={Christian Wuthrich}, journal={arXiv: History and Philosophy of Physics}, year={2020} }

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 gravity, and in particular of cosmological models developed in an approach called 'loop quantum gravity', and explains how they could nevertheless underwrite our manifestly temporal world. A proper interpretation of these models requires a negotiation of an atemporal and a temporal sense of the…

## One Citation

### Re-thinking geometrogenesis: instantaneity in Quantum Gravity scenarios

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Recent Quantum Gravity approaches revealed that space-time emergence opens conceptual difficulties when the theory allows for cosmological scenarios compatible with geometrogenesis. In particular, it…

## References

SHOWING 1-10 OF 39 REFERENCES

### The (A)temporal Emergence of Spacetime

- PhysicsPhilosophy of Science
- 2018

This article examines two cosmological models of quantum gravity (from string theory and loop quantum gravity) to investigate the foundational and conceptual issues arising from quantum treatments of…

### Prospects for a Causal Theory of Space-Time

- Psychology, Philosophy
- 1983

What could possibly constitute a more essential, a more ineliminable, component of our conceptual framework than that ordering of phenomena which places them in space and time? The spatiality and…

### Time in quantum gravity

- Physics
- 2012

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…

### Levels of Spacetime Emergence in Quantum Gravity

- PhysicsPhilosophy Beyond Spacetime
- 2021

We explore the issue of spacetime emergence in quantum gravity by articulating several levels at which this can be intended. These levels correspond to the reconstruction moves that are needed to…

### Raiders of the lost spacetime

- Physics
- 2017

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…

### Thinking about Spacetime

- PhilosophyPhilosophy Beyond Spacetime
- 2021

Several different quantum gravity research programmes suggest, for various reasons, that spacetime is not part of the fundamental ontology of physics. This gives rise to the problem of empirical…

### Follow the bouncing universe.

- Physics, MedicineScientific American
- 2008

The author examines the theory of loop quantum gravity (loop gravity), which presents an alternative to the big bang theory of universal creation. The history of loop gravity is examined, from the…

### Space and Time in Loop Quantum Gravity

- Physics, PhilosophyBeyond Spacetime
- 2020

Quantum gravity is expected to require modifications of the notions of space and time. I discuss and clarify how this happens in Loop Quantum Gravity. (Contribution to the volume "Beyond Spacetime:…

### Spacetime is as spacetime does

- Philosophy, PhysicsStudies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics
- 2018

### Approaching the Planck Scale from a Generally Relativistic Point of View: A Philosophical Appraisal of Loop Quantum Gravity

- Physics
- 2006

My dissertation studies the foundations of loop quantum gravity (LQG), a candidate for a quantum theory of gravity based on classical general relativity. At the outset, I discuss two---and I claim…