Quantum States Prepared by Wormholes: Long-Wavelength Deviations from Bunch-Davies
Abstract
Wineglass wormholes mediate the nucleation of baby universes out of an asymptotically Anti-de Sitter or flat spacetime. Upon materialization, the new universe naturally undergoes an inflationary phase. Here we study the quantum state of tensor and probe scalar field fluctuations that these wormhole geometries prepare, finding that they reproduce the Bunch-Davies vacuum for short-wavelength modes but lead to deviations from Bunch-Davies on large scales. These deviations, which depend on the charge of the wormhole, cause a small shift as well as oscillations in the angular power spectrum generated by an ensuing inflationary phase, and thus provide a distinctive cosmological observable. The wormholes are supported by either axionic or magnetic charges. In the limit of vanishing charge, they undergo a topological transition after which they contain no-boundary instantons. We find that the small-charge limit suppresses deviations from the Bunch-Davies state for both scalar and tensor fluctuations, indicating that the topological transition is smooth.
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BibTeX
@misc{lavrelashvili2026quantum,
title = {{Quantum States Prepared by Wormholes: Long-Wavelength Deviations from Bunch-Davies}},
author = {George Lavrelashvili and Jean-Luc Lehners},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2607.12772},
eprint = {2607.12772},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.12772},
}
RIS
TY - UNPB
TI - Quantum States Prepared by Wormholes: Long-Wavelength Deviations from Bunch-Davies
AU - George Lavrelashvili
AU - Jean-Luc Lehners
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2607.12772
UR - https://arxiv.org/abs/2607.12772
AB - Wineglass wormholes mediate the nucleation of baby universes out of an asymptotically Anti-de Sitter or flat spacetime. Upon materialization, the new universe naturally undergoes an inflationary phase. Here we study the quantum state of tensor and probe scalar field fluctuations that these wormhole geometries prepare, finding that they reproduce the Bunch-Davies vacuum for short-wavelength modes but lead to deviations from Bunch-Davies on large scales. These deviations, which depend on the charge of the wormhole, cause a small shift as well as oscillations in the angular power spectrum generated by an ensuing inflationary phase, and thus provide a distinctive cosmological observable. The wormholes are supported by either axionic or magnetic charges. In the limit of vanishing charge, they undergo a topological transition after which they contain no-boundary instantons. We find that the small-charge limit suppresses deviations from the Bunch-Davies state for both scalar and tensor fluctuations, indicating that the topological transition is smooth.
ER -