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Dynamical Response of Viscous Objects to Gravitational Waves

Valentin Boyanov1, Vitor Cardoso1,2, Kostas D Kokkotas3

  • 1Instituto Superior Técnico-IST, Universidade de Lisboa-UL, CENTRA, Departamento de Física, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal.

Physical Review Letters
|October 25, 2025
PubMed
Summary

Viscous stars absorb high-frequency gravitational waves, mimicking black holes. However, causality prevents them from becoming perfect wave reflectors, though rotating stars may amplify radiation.

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