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>When a light wave enters the new time interface and the device changes its optical properties, the signal keeps moving forward in space. However, the signal ge
by mcdonje 4y ago
>When a light wave enters the new time interface and the device changes its optical properties, the signal keeps moving forward in space. However, the signal gets reversed—if it was a spoken word, it would sound as if it was getting played backwards. In contrast, with a conventional reflection, a light or sound wave would travel back at its source but mostly look or sound the same as it did before
So it's reflecting in a novel way. It's not sending information into the past. The headline gave me the wrong impression. Relativity lives. Time travel doesn't exist.
- IshKebab 4y agoIn fairness this technique is called time reversal because it is equivalent to playing back the waves but with the time axis reversed. (I assume that's it anyway - that's what you do in acoustics.) I agree the headline is misleading though. It doesn't affect how light travels in time.
- greenhearth 4y agoThis. I really thought light was literally going back in time, not getting rewound like a cassette tape.