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PreprintCC BY 4.0arXiv

Did LZ see modified gravity?

  • Basabendu Barman
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Abstract

We investigate whether the recently reported high-energy nuclear recoil event by the LUX-ZEPLIN (LZ) collaboration can be interpreted as a signal of freeze-in dark matter (DM) in a non-standard cosmological history. We consider DM production from the Standard Model thermal bath during an era of modified expansion preceding Big Bang nucleosynthesis. Requiring consistency with the observed DM abundance, cosmological and collider constraints, we identify viable parameter regions that can accommodate the LZ event. Our results demonstrate the potential of direct detection experiments to probe non-standard cosmological histories and, more broadly, alternative theories of gravity.

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Cite

BibTeXRIS
BibTeX
@misc{barman2026modified,
  title = {{Did LZ see modified gravity?}},
  author = {Basabendu Barman},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.15118},
  eprint = {2609.15118},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.15118},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Did LZ see modified gravity?
AU  - Basabendu Barman
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.15118
UR  - https://arxiv.org/abs/2609.15118
AB  - We investigate whether the recently reported high-energy nuclear recoil event by the LUX-ZEPLIN (LZ) collaboration can be interpreted as a signal of freeze-in dark matter (DM) in a non-standard cosmological history. We consider DM production from the Standard Model thermal bath during an era of modified expansion preceding Big Bang nucleosynthesis. Requiring consistency with the observed DM abundance, cosmological and collider constraints, we identify viable parameter regions that can accommodate the LZ event. Our results demonstrate the potential of direct detection experiments to probe non-standard cosmological histories and, more broadly, alternative theories of gravity.
ER  -