Antimatter curves spacetime in the same direction as regular matter
Whether antimatter curves spacetime in the same direction as regular matter (attraction) or the opposite (repulsion) is an active question in physics, with standard theory favoring regular attraction but alternative cosmological models and ongoing experiments investigating potential gravitational repulsion.
The claim addresses whether antimatter curves spacetime like regular matter. Standard general relativity and indirect evidence assume ordinary gravitational attraction (tested by experiments like ALPHA), leading some papers to evaluate or anticipate standard behavior. However, several theoretical papers (e.g., lattice universe and CPT-extension models) specifically propose and explore the alternative hypothesis of gravitational repulsion between matter and antimatter. Because this remains a subject of active experimental testing with competing theoretical models, the status is contested.
The evidence we hold leans evenly split
How this was weighed
official record 3x · fact-check 2x · hedged 1x · crowd & reference 1x
- Description and first application of a new technique to meas · peer-reviewed · supports · weight 1.3 · 2013
- Prospects for comparison of matter and antimatter gravitatio · peer-reviewed · supports · weight 1.3 · 2018
- On the nature of dark energy: the lattice Universe · peer-reviewed · refutes · weight 1.3 · 2013
- Antimatter gravity and the Universe · peer-reviewed · refutes · weight 1.3 · 2019
Charman AE, Amole C, Ashkezari MD, Baquero-Ruiz M, Bertsche W, Butler E, Capra A, Cesar CL, Charlton M, Eriksson S, Fajans J, Friesen T, Fujiwara MC, Gill DR, Gutierrez A, Hangst JS, Hardy WN, Hayden ME, Isaac CA, Jonsell S, Kurchaninov L, Little A, Madsen N, McKenna JT, Menary S, Napoli SC, Nolan P, Olin A, Pusa P, Rasmussen CØ, Robicheaux F, Sarid E, Silveira DM, So C, Thompson RI, van der Werf DP, Wurtele JS, Zhmoginov AI. Description and first application of a new technique to measure the gravitational mass of antihydrogen.. 2013. https://doi.org/10.1038/ncomms2787
Paper [2] notes that indirect evidence largely points to standard gravitational behavior for antimatter, adhering to the weak equivalence principle.
M. Villata. On the nature of dark energy: the lattice Universe. 2013. https://doi.org/10.1007/s10509-013-1388-3
Paper [0] discusses theoretical models proposing mutual gravitational repulsion between matter and antimatter.
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Bertsche WA. Prospects for comparison of matter and antimatter gravitation with ALPHA-g.. 2018. https://doi.org/10.1098/rsta.2017.0265
Paper [6] discusses experimental programs designed to test antimatter gravitation, operating under standard physics assumptions that anticipate ordinary attractive gravitational behavior.
D. Hajdukovic. Antimatter gravity and the Universe. 2019. https://doi.org/10.1142/S0217732320300013
Paper [5] reviews alternative cosmological paradigms that incorporate the hypothesis of gravitational repulsion between matter and antimatter.
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