# Gravitational absorption lines

@article{Palessandro2020GravitationalAL, title={Gravitational absorption lines}, author={Andrea Palessandro and M. Sloth}, journal={Physical Review D}, year={2020}, volume={101}, pages={043504} }

We consider the gravitational analogue of Lyman-alpha absorption lines in astronomical spectroscopy. If Einstein gravity with minimally coupled matter is valid up to the Planck scale, quantum bound states absorb gravitons of a specific frequency with Planckian cross section, $\sigma_{\text{abs}} \approx l_p^2$. Consequently, one can show that gravitational absorption by bound states is inefficient in ordinary gravity. If observed, gravitational absorption lines would therefore constitute a… Expand

#### Paper Mentions

#### References

SHOWING 1-10 OF 52 REFERENCES