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InvisibleDisoRDeR
motional
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Registered: 08/29/02
Posts: 1,158
Loc: nonsensistan
Is gravity not actually a force?
    #14257469 - 04/08/11 08:40 AM (12 years, 11 months ago)

An interesting article I thought was worth sharing...

Is gravity not actually a force? Forcing theory to meet experiments

Quote:

How are controversial ideas handled by modern science? A common charge leveled against science (generally by those who are unhappy with its conclusions) is that the only way to get funding or continue your research is by going along with the current theories and not rocking the boat. For those who spend their careers in science, this is laughable—it is those who successfully rock the boat who are the most successful. In this article, we are going to look at a manuscript that purports to overturn hundreds of years of accepted ideas about gravity, and use it as an illustration of how controversial ideas are dealt with in modern physics.



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OfflineSimms
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Registered: 11/17/08
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Re: Is gravity not actually a force? [Re: DisoRDeR]
    #14260237 - 04/08/11 06:58 PM (12 years, 11 months ago)

Now I don't understand this. Fluids etc, emergent phenomenons act on forces, so what affects gravity?

Albert Einstein said that gravity is the wrappage of space-time, which can be fluent phenomenon in itself, but what (force?) pulls the space-time?


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InvisibleDisoRDeR
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Registered: 08/29/02
Posts: 1,158
Loc: nonsensistan
Re: Is gravity not actually a force? [Re: Simms]
    #14276746 - 04/12/11 07:07 AM (12 years, 11 months ago)

Rather than misrepresent the theory in an attempt to answer your questions, I'll instead tear a few pieces from the original paper which is the subject of this article...

The (non-peer reviewed) paper can be found here

Quote:

Abstract:

Starting from first principles and general assumptions Newton's law of gravitation is shown to arise naturally and unavoidably in a theory in which space is emergent through a holographic scenario. Gravity is explained as an entropic force caused by changes in the information associated with the positions of material bodies. A relativistic generalization of the presented arguments directly leads to the Einstein equations. When space is emergent even Newton's law of inertia needs to be explained. The equivalence principle leads us to conclude that it is actually this law of inertia whose origin is entropic.




and...

Quote:

The universality of gravity suggests that its emergence should be understood from
general principles that are independent of the speci c details of the underlying micro-
scopic theory. In this paper we will argue that the central notion needed to derive
gravity is information. More precisely, it is the amount of information associated with
matter and its location, in whatever form the microscopic theory likes to have it, mea-
sured in terms of entropy. Changes in this entropy when matter is displaced leads to
an entropic force, which as we will show takes the form of gravity. Its origin therefore
lies in the tendency of the microscopic theory to maximize its entropy.

The most important assumption will be that the information associated with a
part of space obeys the holographic principle [8, 9]. The strongest supporting evidence
for the holographic principle comes from black hole physics [1, 3] and the AdS/CFT
correspondence [10]. These theoretical developments indicate that at least part of
the microscopic degrees of freedom can be represented holographically either on the
boundary of space-time or on horizons.





Quite an interesting idea, but beyond the idea itself I appreciated that the article went the full circle of presenting a rebuttal to the paper based on the theory's lack of accord with experimental evidence.

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