Negative Mass in sound waves

1. 2019-03-12 at 3:05 PM UTC

   #1
   

   Soyboy V: A Cat-Girl/Boy Under Every Bed African Astronaut [my no haunted nonbeing]

   Thus, in a very physical sense, the phonon carries (negative) mass. Moreover, this is not due to the usual equivalence of mass and energy in relativity: the effect survives in the non-relativistic limit. And, finally, it is not a quantum effect, because the formalism of [1] applies unaltered to classical waves.

   
   https://arxiv.org/pdf/1807.08771.pdf
   
   Gravity is freaky.
2. 2019-03-12 at 3:18 PM UTC

   #2
   

   -SpectraL coward [the spuriously bluish-lilac bushman]
   Relativistic quantum mechanics.
   
   https://en.wikipedia.org/wiki/Relativistic_quantum_mechanics
3. 2019-03-12 at 5:10 PM UTC

   #3
   The Self Taught Man Black Hole

   Originally posted by -SpectraL Relativistic quantum mechanics.
   
   https://en.wikipedia.org/wiki/Relativistic_quantum_mechanics

   
   Pythagorean theorem
   
   https://en.m.wikipedia.org/wiki/Pythagorean_theorem
4. 2019-03-12 at 7:06 PM UTC

   #4
   

   -SpectraL coward [the spuriously bluish-lilac bushman]
   It's all relative. What you see, and what is really is, are not the same thing.
   
   For example, not all is what it appears to be. These lines are all perfectly horizontal, yet you would swear they are not:
   
   
5. 2019-03-27 at 9:56 PM UTC

   #5
   We'reAllBrownNosers African Astronaut
   https://www.caltech.edu/about/news/levitating-objects-light
   
   Related, but still theoretical. There is a MUCH better way to levitate things using light than what they're proposing. The government doesn't want to allow that of course.