Centuries-old physics test could help detect millicharged particles

Theoretical physicists have long predicted the existence of millicharged particles (mCPs), hypothetical particles that carry a very small electric charge. These particles are expected to interact very weakly with ordinary matter and electromagnetic fields; hence, they would be difficult to detect in conventional particle physics experiments.

The top 3

  1. Eötvös Experiment: Equivalence Principle Confirmed: The Eötvös experiment, conducted by Loránd Eötvös starting in 1885, precisely demonstrated the equivalence of inertial and gravitational mass, a cornerstone of Einstein's General Theory of Relativity, with an accuracy improved to 1 part in 100 million by 1909 and even higher in later refinements.
  2. Galileo's Leaning Tower: Dispelling Aristotle's Fallacy: Galileo Galilei's legendary experiment from the Leaning Tower of Pisa, around 1590, famously challenged Aristotle's long-held belief that heavier objects fall faster, demonstrating that objects fall at the same rate regardless of their mass (neglecting air resistance), thus laying crucial groundwork for classical mechanics.
  3. Newton's Prism: Decomposing White Light: Isaac Newton's 1666 prism experiments demonstrated that white light is a composite of all colors of the rainbow, which can be separated by a prism and then recombined, a pivotal discovery that established the foundations of optics and color theory.

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