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Experiments Show Gravity Is Not an Emergent Phenomenon
MIT Technology Review ^ | 08/24/2011 | Staff

Posted on 08/24/2011 2:52:57 PM PDT by Red Badger

The way gravity effects quantum particles proves that it cannot be an emergent phenomenon, says physicist.

One of the most exciting ideas in modern physics is that gravity is not a traditional force, like electromagnetic or nuclear forces. Instead, it is an emergent phenomenon that merely looks like a traditional force.

This approach has been championed by Erik Verlinde at the University of Amsterdam who put forward the idea in 2010. He suggested that gravity is merely a manifestation of entropy in the Universe, which always increases according to the second law of thermodynamics. This causes matter distribute itself in a way that maximises entropy. And the effect of this redistribution looks like a force which we call gravity.

Much of the excitement over Verlinde's idea is that it provides a way to reconcile the contradictions between gravity, which works on a large scale, and quantum mechanics, which works on a tiny scale.

The key idea is that gravity is essentially a statistical effect. As long as each particle is influenced by a statistically large number of other particles, gravity emerges. That's why it's a large-scale phenomenon.

But today, Archil Kobakhidze at The University of Melbourne in Australia points to a serious problem with this approach. He naturally asks how gravity can influence quantum particles.

Kobakhidze argues that since each quantum particle must be described by a large number of other particles, this leads to a particular equation that describes the effect of gravity.

But here's the thing: the conventional view of gravity leads to a different equation.

In other words, the emergent and traditional views of gravity make different predictions about the gravitational force a quantum particle ought to experience. And that opens the way for an experimental test.

As it happens, physicists have been measuring the force of gravity on neutrons for ten yeas or so. And...wait for the drum roll... the results exactly match the predictions of traditional gravitational theory, says Kobakhidze.

"Experiments on gravitational bound states of neutrons unambiguously disprove the entropic origin of gravitation," he says.

That's an impressive piece of physics. It'll be interesting to see how Verlinde and his supporters respond.

Ref: arxiv.org/abs/1108.4161: Once More: Gravity Is Not An Entropic Force


TOPICS: Culture/Society; Technical
KEYWORDS: electrogravitics; force; gravity; physics; unifiedtheory
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To: LeGrande

I’m not talking about that particular effect. Several scientists (I’ll try to find the study) used commercial and military aircraft to circumnavigate and test relativity in particular. It was about 10 years or so ago...


141 posted on 08/25/2011 8:23:02 AM PDT by Charles H. (The_r0nin) (Hwaet! Lar bith maest hord, sothlice!)
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To: tophat9000
remember the faster you go time slows down

Begs the question: Time slows down relative to whom?

142 posted on 08/25/2011 10:31:42 AM PDT by Melas (u)
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To: Lorianne
Why is it that physicists can challenge conventional ‘consensus’ scientific theory, but climate scientists cannot?

Because climate science as become politicized to the point where it's no longer science. I don't trust anyone, on either side of the climate debate because it has become so political.

143 posted on 08/25/2011 10:35:34 AM PDT by Melas (u)
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To: concerned about politics

There is a debate, but it’s not a debate about which one exists. It’s just a fact that relativistic physics don’t work on a quantum scale, and quantum physics don’t work on a relativistic scale. The debates center on the “why” of this phenomenon, and as of yet, there is no provable answer.


144 posted on 08/25/2011 10:49:54 AM PDT by Melas (u)
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To: Charles H. (The_r0nin)
I’m not talking about that particular effect. Several scientists (I’ll try to find the study) used commercial and military aircraft to circumnavigate and test relativity in particular. It was about 10 years or so ago...

I thought that was correct too, until I helped on the guidance system for the Tomahawk cruise Missile. Then I had the 'duh' moment. Same for orbital mechanics, QM, etc.

145 posted on 08/25/2011 3:06:21 PM PDT by LeGrande ("life's tough; it's tougher if you're stupid." John Wayne)
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