Aspects of quadratic gravity

@article{AlvarezGaum2015AspectsOQ,
  title={Aspects of quadratic gravity},
  author={L. Alvarez-Gaum{\'e} and A. Kehagias and C. Kounnas and D. Lust and A. Riotto},
  journal={Protein Science},
  year={2015},
  volume={64},
  pages={176-189}
}
We discuss quadratic gravity where terms quadratic in the curvature tensor are included in the action. After reviewing the corresponding eld equations, we analyze in detail the physical propagating modes 

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