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}
}
  • S. Carroll
  • Published 28 August 2003
  • Physics, Medicine
  • Nature
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

Figures from this paper

Cosmology: Synchrotron radiation and quantum gravity
Photons may evade a synchrotron radiation constraint on quantum gravity by violating the equivalence principle.
Improving Limits on Planck‐Scale Lorentz Symmetry Test Theories
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
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
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.
TLDR
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

SHOWING 1-4 OF 4 REFERENCES
A strong astrophysical constraint on the violation of special relativity by quantum gravity
TLDR
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.
Ultraviolet modifications of dispersion relations in effective field theory.
TLDR
Effective field theory is applied and dimension-5 operators that do not mix with dimensions 3 and 4 and lead to cubic modifications of dispersion relations for scalars, fermions, and vector particles are identified.
Tests of quantum gravity from observations of γ-ray bursts
The recent confirmation that at least some γ-ray bursts originate at cosmological distances suggests that the radiation from them could be used to probe some of the fundamental laws of physics. Here
Potential Sensitivity of Gamma-Ray Burster Observations to Wave Dispersion in Vacuo
The recent confirmation that at least some gamma-ray bursters (GRBs) are indeed at cosmological distances raises the possibility that observations of these could provide interesting constraints on