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It might be possible to detect gravitons after all
A new experimental proposal suggests detecting a particle of gravity is far easier than anyone imagined. Now physicists are debating what it would really prove.
It took decades of effort and the construction of the colossal, miles-long detectors that make up the Laser Interferometer Gravitational-Wave Observatory (LIGO) to first sense a rumble in space-time in 2015 — one sent out by a collision between distant black holes. In a lecture in 2012, the eminent physicist Freeman Dysonconsidered gravitational waves from the sun, where the violent churning of matter inside the star should constantly send out mild tremors in space-time. One of the groups pushing the state of the art on this front is at ETH Zurich, where Fadel and his collaborators cool tiny sapphire crystals until they display quantum properties.
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