PreprintCC BY 4.0arXiv
Charging Across the Phantom Divide with Modified Gravity
Abstract
Cosmology where the effective dark energy crosses w=−1 can be realized in Horndeski gravity with shift symmetric terms plus a linear potential. We highlight the special role of the nearly conserved scalar charge. The theory is highly predictive for the early phantom behavior and we identify three ways to cross w=−1. None of them recreate conditions indicated by current data very well. The major lesson is that such modified gravity with a potential lacking a cosmological constant and only crossing w=−1 once (hence the less elaborate models) has difficulty fitting current data. We provide an online interactive application solving the system of evolution equations, for the reader to explore various scenarios at will.
Related
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BibTeX
@misc{calderon2026charging,
title = {{Charging Across the Phantom Divide with Modified Gravity}},
author = {Rodrigo Calderon and Eric V. Linder},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.26259},
eprint = {2605.26259},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.26259},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Charging Across the Phantom Divide with Modified Gravity
AU - Rodrigo Calderon
AU - Eric V. Linder
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2605.26259
UR - https://arxiv.org/abs/2605.26259
AB - Cosmology where the effective dark energy crosses w=−1 can be realized in Horndeski gravity with shift symmetric terms plus a linear potential. We highlight the special role of the nearly conserved scalar charge. The theory is highly predictive for the early phantom behavior and we identify three ways to cross w=−1. None of them recreate conditions indicated by current data very well. The major lesson is that such modified gravity with a potential lacking a cosmological constant and only crossing w=−1 once (hence the less elaborate models) has difficulty fitting current data. We provide an online interactive application solving the system of evolution equations, for the reader to explore various scenarios at will.
ER -