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Peer-reviewedCC BYInternational Journal of Modern Physics D

Before the Bang: Wormholes at the dawn of the universe

  • Panos Betzios
  • Paul Ghiringhelli
  • Ioannis Gialamas
  • Olga Papadoulaki
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Abstract

This essay discusses recent progress on Euclidean wormholes as candidate contributions to the Universe's initial quantum state. The comparison with the Hartle-Hawking no-boundary proposal highlights both a conceptual affinity and genuine advance: wormholes retain the relevance of Euclidean-saddles as encoders of properties of cosmological wavefunctions, while they broaden the class of regular saddles that are physically relevant for inflating universes and are capable of resolving issues that plague the no-boundary proposal. The principal achievement of the wormhole program is to enlarge the semiclassical initial-condition land-scape in a way that is physically rich, conforms with Holographic expectations and as such becomes increasingly relevant for early-universe model building, within UV complete theories of quantum gravity.

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Cite

BibTeXRIS
BibTeX
@article{betzios2026before,
  title = {{Before the Bang: Wormholes at the dawn of the universe}},
  author = {Panos Betzios and Paul Ghiringhelli and Ioannis Gialamas and Olga Papadoulaki},
  journal = {International Journal of Modern Physics D},
  year = {2026},
  month = sep,
  doi = {10.1142/s0218271826410166},
  url = {https://hal.science/hal-05771499v1},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Before the Bang: Wormholes at the dawn of the universe
AU  - Panos Betzios
AU  - Paul Ghiringhelli
AU  - Ioannis Gialamas
AU  - Olga Papadoulaki
PY  - 2026
DA  - 2026/09/07
JO  - International Journal of Modern Physics D
DO  - 10.1142/s0218271826410166
UR  - https://hal.science/hal-05771499v1
AB  - This essay discusses recent progress on Euclidean wormholes as candidate contributions to the Universe's initial quantum state. The comparison with the Hartle-Hawking no-boundary proposal highlights both a conceptual affinity and genuine advance: wormholes retain the relevance of Euclidean-saddles as encoders of properties of cosmological wavefunctions, while they broaden the class of regular saddles that are physically relevant for inflating universes and are capable of resolving issues that plague the no-boundary proposal. The principal achievement of the wormhole program is to enlarge the semiclassical initial-condition land-scape in a way that is physically rich, conforms with Holographic expectations and as such becomes increasingly relevant for early-universe model building, within UV complete theories of quantum gravity.
SN  - 0218-2718
SN  - 0218-2718
ER  -