Researchers Find Source of Strange 'Negative' Gravity

LiveScience ^ | August 10, 2018 | Rafi Letzler

[plain talk]

Sound has negative mass, and all around you it's drifting up, up and away — albeit very slowly.

That's the conclusion of a paper submitted on July 23 to the preprint journal arXiv, and it shatters the conventional understanding that researchers have long had of sound waves: as massless ripples that zip through matter, giving molecules a shove but ultimately balancing any forward or upward motion with an equal and opposite downward motion. That's a straightforward model that will explain the behavior of sound in most circumstances, but it's not quite true, the new paper argues.

A phonon — a particle-like unit of vibration that can describe sound at very small scales — has a very slight negative mass, and that means sound waves travel upward ever so slightly, said Rafael Krichevsky, a graduate student in physics at Columbia University.

[Tolerance Sucks Rocks]

A phonon — a particle-like unit of vibration that can describe sound at very small scales — has a very slight negative mass, and that means sound waves travel upward ever so slightly, said Rafael Krichevsky, a graduate student in physics at Columbia University.

The ^{Sound And The Fury}

Combined ^{PING! and DANG!}

[Windflier]

I’ve wondered if some of this seemingly supernatural stuff (like the pyramids) IS supernatural. Some Bible verses seem to point to angels living on earth and having children with humans - the Nephalim were the offspring iirc.

That's kinda the ancient astronaut theory in a nutshell. To ancient primitives, an advanced culture such as ours would appear to be supernatural, and our technology to be magic.

It wouldn't be a stretch for them to consider such people to be gods. This has actually happened many times in recorded history, when backwards people were suddenly confronted with visitors from more technologically advanced societies.

I've got an open mind where it comes to biblical accounts of the Nephilim, giants on the earth, etc. If we take those ancient chroniclers at their word...

[al baby]

Dark matter matters

[TBP]

How is a particle with negative mass possible?

[Tolerance Sucks Rocks]

Beats me. I’m guessing it’s similar to how you can use complex numbers (a + bi, where i is the square root of -1) to explain certain things in physics.

[Excuse_My_Bellicosity]

[I know I’m a serious Johnny-come-lately but I just stumbled on this thread and had to comment.]

This guy’s a crackpot. He couldn’t come up with anything for a legit thesis, so he’s hoping somebody/anybody publishing his leaked paper will lend credence to it. Sound has a much longer wavelength any kind of light, so talking about sound waves on sub-atomic scales is completely stupid.

[Excuse_My_Bellicosity]

So if I play my guitar long enough, it will just disappear?

[Excuse_My_Bellicosity]

Yup! I wouldn’t bet on this one getting past his first thesis review board.

[Excuse_My_Bellicosity]

With sound traveling long distances, the downward curve of the earth is going to have much more of an effect I’d bet.

[Excuse_My_Bellicosity]

This is a paper written by a grad student, so I’m betting it will die a quiet death when his faculty says, “Find another subject for your thesis.”

[Excuse_My_Bellicosity]

African or European swallows?

[Excuse_My_Bellicosity]

Sounds like a guy who’s getting a lot of negative @$$ in college.