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the claim

Antimatter has negative mass and falls upward in Earth's gravity.

the verdict
REFUTED
the evidence says no
Recorded sources
1 source for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that antimatter has negative mass and falls upward in Earth's gravity?

No. The ALPHA-g antihydrogen experiment reported that antimatter falls toward Earth, consistent with ordinary gravitational attraction, and reference works state antiparticles carry the same positive mass as their matter counterparts. One speculative model assigns antimatter negative mass but does not address free fall on Earth.

Verdict: REFUTED · 1 source for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 1
Challenging the Standard Model
2024
Get citation
Petit, J. (2024). Challenging the Standard Model. zenodo.org. https://doi.org/10.5281/zenodo.11350718

Evidence against · 4
Has anyone ever considered the possibility that antimatter has negative *active* gravitational mass?
2026
Get citation
Has anyone ever considered the possibility that antimatter has negative *active* gravitational mass?. (2026). physics.stackexchange.com. https://physics.stackexchange.com/questions/871692/has-anyone-ever-considered-the-possibility-that-antimatter-has-negative-active

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More against · 3
Gravitational interaction of antimatter - Wikipedia
Get citation
Gravitational interaction of antimatter - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Gravitational_interaction_of_antimatter

New Light Through Old Windows: Exploring Contemporary Science Through 12 Classic Science Fiction Tales
2019
Get citation
Webb, S. (2019). New Light Through Old Windows: Exploring Contemporary Science Through 12 Classic Science Fiction Tales. play.google.com. https://play.google.com/store/books/details?id=GM6CDwAAQBAJ&source=gbs_api

Gravity from the Ground Up
2003
Get citation
Schutz, B. (2003). Gravity from the Ground Up. play.google.com. https://play.google.com/store/books/details?id=v50gAwAAQBAJ&source=gbs_api

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