# Quantum gravity: An astrophysical constraint

@article{Carroll2003QuantumGA, title={Quantum gravity: An astrophysical constraint}, author={Sean Carroll}, journal={Nature}, year={2003}, volume={424}, pages={1007-1008} }

A quantum theory of gravity is proving elusive. Observations of radiation from the Crab nebula now place even stronger constraints on the likelihood of detecting the effects of quantum gravity.

## 5 Citations

Cosmology: Synchrotron radiation and quantum gravity

- Physics, MedicineNature
- 2004

Photons may evade a synchrotron radiation constraint on quantum gravity by violating the equivalence principle.

Improving Limits on Planck‐Scale Lorentz Symmetry Test Theories

- Physics
- 2004

In the recent quantum gravity literature there has been strong interest in the possibility of Planck-scale departures from Lorentz symmetry. I focus on two minimal test theories, a pure kinematics…

Introduction to Quantum-Gravity Phenomenology

- Physics
- 2004

After a brief review of the first phase of development of Quantum-Gravity Phenomenology, I argue that this research line is now ready to enter a more advanced phase: while at first it was legitimate…

Phenomenology of Planck-scale Lorentz-symmetry test theories

- Physics
- 2004

In the recent quantum-gravity literature, there has been considerable interest in exploring the possibility of Planck-scale departures from Lorentz symmetry, including possible modifications of the…

On species persistence-time distributions.

- Biology, MedicineJournal of theoretical biology
- 2012

New theoretical and empirical results on the probability distributions of species persistence times in natural ecosystems are presented and notable coherence between spatial and temporal macroecological patterns, theoretically derived and empirically verified are suggested to underlie general features of the dynamic evolution of ecosystems.

## References

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The observation of 100-MeV synchrotron radiation from the Crab nebula is used to improve the previous limit by a factor of 40 million, ruling out this type of Lorentz violation, and thereby providing an important constraint on theories of quantum gravity.

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