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A scientific controversy has emerged regarding the measurement of strong attractive forces in micrometre-sized narrow-gap cavities. Experimental researchers claim theoretical calculations using proximity force approximation fail to match their observed results due to geometric differences in the models.

Experimental Findings Challenge Theoretical Predictions

Scientific reports indicate a significant discrepancy between theoretical predictions and experimental measurements of attractive forces in micrometre-scale re-entrant cavities. According to sources familiar with the research, experimental teams have detected force magnitudes that cannot be adequately explained by current Casimir force calculations using proximity force approximation (PFA) methods.