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Using standard big-bang nucleosynthesis and present, high-precisionmeasurements of light element abundances, we place constraints on theself-gravity of radiation pressure in the early universe. The self-gravity ofpressure is strictly non-Newtonian, and thus the constraints we set are adirect test of this aspect of general relativity.

Constraints on the Self-Gravity of Radiation Pressure via Big Bang Nucleosynthesis