# Browse Physics

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Existing or planned electron accelerators may be able to see the breakdown of general relativity.

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New calculations of hypothetical “black hole bombs” set an upper limit on the possible mass of the photon and on the existence of certain dark matter candidates.

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The gravitational version of the Aharonov-Bohm effect, where particles are affected by the gravitational potential in the absence of a force, could be demonstrated in a lab-scale experiment using ultracold atoms.

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Using the orbiting network of GPS satellites, researchers have placed new limits on how much Planck’s constant varies with respect to relativistic changes.

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Ultracold atoms trapped in optical lattices allow high-precision measurement of the gravitational constant.

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A three-dimensional version of gravity might lend itself to a quantum treatment.

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Finding a quantum theory of gravity remains one of the great unsolved problems in modern physics. Two papers present a quantum gravity theory that, while making different assumptions than general relativity, still reproduces Einstein’s theory in certain limits.

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