Gravity and Charge: Physics' Blind Spot ⚡ экспресс

Since the days of Galileo, it was believed that in a vacuum all bodies fall identically. Einstein elevated this to a principle: gravity travels at the speed of light and is the curvature of spacetime. But this picture has a gaping blind spot — the effect of electric charge on gravity has never been seriously tested. The most precise experiments deliberately used neutral objects, leaving unanswered a simple question: would a charged ball fall faster?

A new theory links gravity and electricity with a common rule: charge and mass move in unison. From this it follows that the acceleration of gravity should vary slightly depending on the charge-to-mass ratio — the greater the charge per unit mass, the more noticeable the deviation. The electron turns out to be the 'most charged' per kilogram: its value is 1836 times that of a proton — as if an ant were towing a truck. Yet no experiment has ever dropped electrons in a gravitational field.

The idea can be tested with an old tool — the torsion balance, a device that reacts to the faintest attraction between weights. By adding control of electric charge on the test masses, physicists hope to shine a light on this blind spot for the first time. The result could point to hidden connections beyond the Standard Model.