# Gravitational Absorption Lines

24 Jan 2020 Palessandro Andrea Sloth Martin S.

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, $\sigma_{\text{abs}} \approx l_p^2$... (read more)

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# Categories

• HIGH ENERGY PHYSICS - THEORY
• COSMOLOGY AND NONGALACTIC ASTROPHYSICS
• GENERAL RELATIVITY AND QUANTUM COSMOLOGY