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PreprintCC BY 4.0arXiv

Viable Phantom Crossing in Softly Broken Shift Symmetric Gravity

  • Rodrigo Calderon
  • Eric V. Linder
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Abstract

We demonstrate a viable fit to current cosmological data from a simple Horndeski modified gravity theory that softly breaks shift symmetry. This SBSS model crosses the phantom divide w=−1 at z≈0.5 and fits observational data (baryon acoustic oscillations and supernova distances, and cosmic microwave background power spectra) better than w0waCDM, by Δχ2≈−3 for the same number of effective parameters, while providing a physical foundation for cosmic acceleration. The theory is healthy, has no cosmological constant or potential, and has substantial protection against high energy quantum loop corrections.

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Cite

BibTeXRIS
BibTeX
@misc{calderon2026viable,
  title = {{Viable Phantom Crossing in Softly Broken Shift Symmetric Gravity}},
  author = {Rodrigo Calderon and Eric V. Linder},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07035},
  eprint = {2611.07035},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07035},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Viable Phantom Crossing in Softly Broken Shift Symmetric Gravity
AU  - Rodrigo Calderon
AU  - Eric V. Linder
PY  - 2026
DA  - 2026/11/04
PB  - arXiv
DO  - 10.48550/arxiv.2611.07035
UR  - https://arxiv.org/abs/2611.07035
AB  - We demonstrate a viable fit to current cosmological data from a simple Horndeski modified gravity theory that softly breaks shift symmetry. This SBSS model crosses the phantom divide w=−1 at z≈0.5 and fits observational data (baryon acoustic oscillations and supernova distances, and cosmic microwave background power spectra) better than w_0w_aCDM, by Δχ^2≈−3 for the same number of effective parameters, while providing a physical foundation for cosmic acceleration. The theory is healthy, has no cosmological constant or potential, and has substantial protection against high energy quantum loop corrections.
ER  -