This is almost duplicate since I remember a similar article which talked about some experiment by Italian scientists a few years ago.

But again, our current understanding is that gravity is the curvature of space and time. The anti-matter has no choice but to follow that curvature. It cannot pretend that curvature does not exist.

So, if anti-matter were actually fallen up you can throw general relativity out of the window. I do not expect that will happen.

There is already a standard with nanosecond precision (or better).
It's called 1588 PTP.

https://en.wikipedia.org/wiki/...

The Orville: Majority Rule
https://en.wikipedia.org/wiki/...

Shouldn't be the first and foremost use case of an 'autopilot' not to crash into any unmoving object on the road in front of the vehicle?

If an 'autopilot' cannot do that, it is useless.

Physicists should not be mathematicians, they should be primarily physicists. Not everything is real what math allows. If that were the case, the SU(5)
  model (https://en.wikipedia.org/wiki/Georgi%E2%80%93Glashow_model) would have worked.

Mathematics can describe reality, but reality is not mathematics.

Explaining the Elongated Shape of Oumuamua by the Eikonal Abrasion Model

http://iopscience.iop.org/arti...

but it may not from the Universe' point of view.

According to Gerard 't Hooft, the superdeterminism loophole cannot be dismissed.

The Free-Will Postulate in Quantum Mechanics
https://arxiv.org/abs/quant-ph...

Entangled quantum states in a local deterministic theory
https://arxiv.org/abs/0908.340...

https://arxiv.org/abs/0903.383...

Time is just the sequence of events. And events on the smallest scale are particle interactions.

What if there is an unknown quantum field which creates a barrier between particles? And particles have to "tunnel" through it in order to interact?

When this quantum field is more disturbed (warped, etc) this barrier will be greater and it would be harder to particles to interact with each other. The end result is "time" slows down since the number of interactions drops.

Note that an observer (in its own reference frame) will not notice anything (in the same way as in general relativity) since the observer just counts the number of interactions. To that observer the same number of interactions means the same amount of "time" passes.

And yes, this means this quantum field would be a distinguished reference frame.

Strong XUV irradiation of the Earth-sized exoplanets orbiting the ultracool dwarf TRAPPIST-1

https://arxiv.org/abs/1605.015...

I think space itself is some kind of medium and not necessarily matter based. Currently, its composition is unknown. You can call this medium aether if you like, just do not confuse it with the luminiferous aether. There are several aether theories out there, one of the popular ones is the Superfluid Vacuum Theory.

Now, back to gravity. We know since Einstein that matter curves/disturbs space**. So, this medium, which is disturbed by matter, wants to be 'smooth' and it exerts a force on matter. This force is obviously a push force and we call it gravity.

From our perspective there is no way to differentiate between pull or push. Maybe until now.

** I know that according to GR gravity is a curvature of space-time and not just space. But if space itself is some kind of medium then the time dimension simply does not exist. What happens is that the disturbance of space prevents matter particles to interact with each other. We perceive this lack of interaction as if 'time' slow down since there is no change (We can only perceive 'time' by observing change). This picture is compatible with GR since relativity between moving bodies through space remains. However, it establishes a distinguished reference frame which is space itself.

Well, they debunked the luminiferous ether, but there are other aether theories out there. A 'popular' one is the Superfluid vacuum theory.

https://en.wikipedia.org/wiki/...

Also, Erik Verlinde talks about 'elastic back pressure' in his recent paper https://arxiv.org/pdf/1611.022... concerning 'emergent gravity'.

Personally I do not think gravity is emergent, but I wonder if elasticity could be applied to space itself. That could explain observations without dark matter.

Even dark energy can be explained. In this case dark energy would be the elastic energy of space. So, it's no wonder the universe is expanding.

It has also implications to the fate of the universe. I mean it may not depend on how much matter is in the universe, but rather what kind of properties space has.

This is not how Kalman filter works. Even if it gets totally wrong data for one second it outputs "correct" values based on previous data.

So, in our case the altitude output would have changed for this one second and the output values would have been quite close to the real altitude.

https://en.wikipedia.org/wiki/...

How in hell did they test their Kalman filter to allow such bad data to reach the decision logic? (I assume they used one.)

It's strange that Verlinde uses 'elastic' in the abstract.

"The emergent laws of gravity contain an additional dark gravitational
force describing the elastic response due to the entropy displacement."

I think space can be thought of like some kind of elastic material. At first, space begins to regain its original form (where there is no matter) quickly from the center of gravitation. However, as we go further and further from the center this process slows down.

The end result is that space will be more curved than we expect at large distances.

The complete naivete of the slahdot crowd concerning UBI is beyond comprehension.

It looks like most slahdotters think a simple tinkering with the taxation system (which will mostly affect wealthy corporations and individuals) will bring universal joy to everyone.

I tell you what. It will absolutely do no good. It looks like everyone thinks that wealthy men keep their wealth in some kind of vault like Smaug. This is not the case. Most of their wealth is already in the economy, there is basically nothing you can get from the wealthy by taxing them more.

At best UBI will create a society similar to the one in Atlas Shrugged. I do not like to live in such society.

So, what is the solution to the problems UBI is supposed to cure? Most probably the answer is WAR. Currently, nobody dares to comprehend this possibility.