Science:
Physicists' best chance of spotting an effect of "
quantum
gravity"—the melding of quantum mechanics and
Einstein's theory of gravity—may have
evaporated.According to some quantum-gravity theories, the
speed of light may change very slightly with the light's
wavelength, and experimenters are searching for the effect in
radiation from distant stellar explosions.Those searches may be
in vain, however says
Sabine
Hossenfelder of the Nordic Institute for Theoretical Physics in
Stockholm. If light's speed varied in this way, then
untenable paradoxes would arise,
she says.The speed
variations must be at least 23 orders of magnitude smaller than
experimental limits set last year, she adds.
Related link
The box-problem in
deformed special relativity
