@article{https://doi.org/10.48550/arxiv.2111.14664,
doi = {10.48550/ARXIV.2111.14664},
url = {https://arxiv.org/abs/2111.14664},
author = {Fumagalli,
Jacopo and Palma,
Gonzalo A. and Renaux-Petel,
Sébastien and Sypsas,
Spyros and Witkowski,
Lukas T. and Zenteno,
Cristobal},
keywords = {Cosmology and Nongalactic Astrophysics (astro-ph.CO),
General Relativity and Quantum Cosmology (gr-qc),
High Energy Physics - Theory (hep-th),
FOS: Physical sciences,
FOS: Physical sciences},
title = {Primordial gravitational waves from excited states},
publisher = {arXiv},
year = {2021},
copyright = {arXiv.org perpetual,
non-exclusive license} }