A single photon cannot produce an electron-positron pair in free space

the verdict

SUPPORTED

the evidence backs this

Recorded sources

2 sources for · 0 against

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

According to the laws of quantum electrodynamics and momentum-energy conservation, a single real photon cannot spontaneously decay into an electron-positron pair in free space without interacting with another particle or external field.

The analysis

Energy and momentum conservation laws in kinematics forbid a single real photon from producing an electron-positron pair in empty space; it requires an additional body (such as a nucleus) or multiple photons to absorb surplus momentum. Papers [2] and [9] discuss Breit-Wheeler pair production within strong-field QED, confirming that high fields or interactions are necessary for this process.

Evidence for · 2

Input to the European strategy for particle physics: strong-field quantum electrodynamics.

Recorded source metadata

Sarri G, King B, Blackburn T, Ilderton A, Boogert S, Bulanov SS, Bulanov SV, Di Piazza A, Ji L, Karbstein F, Keitel CH, Krajewska K, Malka V, Mangles SPD, Mathieu F, McKenna P, Meuren S, Mirzaie M, Ridgers C, Seipt D, Thomas AGR, Uggerhøj U, Vranic M, Wing M. Input to the European strategy for particle physics: strong-field quantum electrodynamics.. 2025. https://doi.org/10.1140/epjp/s13360-025-07057-7

Discusses Breit-Wheeler pair production (photon-to-electron-positron conversion) as an exotic strong-field QED phenomenon that requires extreme conditions or fields to occur rather than happening for a single photon in free space.

Source citation format

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More for · 1

Numerical proof-of-concept of nanofoam-based targets for proton acceleration and high-energy photon and positron generation in strong fields

Recorded source metadata

Galbiati M, Ambrogioni K, Monaco LFC, De Magistris MSG, Orecchia D, Mirani F, Maffini A, Passoni M. Numerical proof-of-concept of nanofoam-based targets for proton acceleration and high-energy photon and positron generation in strong fields. 2025. https://doi.org/10.21203/rs.3.rs-7808232/v1

Examines nonlinear Breit-Wheeler pair production in the context of high-intensity laser-matter interactions, highlighting that pair production from photons requires specific high-field environments.

Source citation format

The paper trail · every fact has a biography

first checked01 Aug 2026

judged → SUPPORTED · 7501 Aug 2026

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