PreprintCC BY 4.0arXiv
The Symbiosis of Vainshtein and Chameleon Screening
Abstract
We present the first study of coexisting Vainshtein and Chameleon screening in cosmic structures. Screening hides fifth forces locally, keeping modified gravity viable. Realistic dark-energy models can activate several mechanisms at once, yet this interplay has been overlooked. We find that (i) the Chameleon resolves the long-standing Galileon void pathology; (ii) it suppresses or eliminates the Vainshtein radius around massive sources; and (iii) the Vainshtein term shrinks the Chameleon's screened core. These effects reshape the observable signatures central to cosmological tests of gravity.
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BibTeX
@misc{sirera2026symbiosis,
title = {{The Symbiosis of Vainshtein and Chameleon Screening}},
author = {Sergi Sirera and Tessa Baker and Clare Burrage and James Hallam and Krishna Naidoo},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36166},
eprint = {2610.36166},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36166},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The Symbiosis of Vainshtein and Chameleon Screening
AU - Sergi Sirera
AU - Tessa Baker
AU - Clare Burrage
AU - James Hallam
AU - Krishna Naidoo
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.36166
UR - https://arxiv.org/abs/2610.36166
AB - We present the first study of coexisting Vainshtein and Chameleon screening in cosmic structures. Screening hides fifth forces locally, keeping modified gravity viable. Realistic dark-energy models can activate several mechanisms at once, yet this interplay has been overlooked. We find that (i) the Chameleon resolves the long-standing Galileon void pathology; (ii) it suppresses or eliminates the Vainshtein radius around massive sources; and (iii) the Vainshtein term shrinks the Chameleon's screened core. These effects reshape the observable signatures central to cosmological tests of gravity.
ER -