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how gravity works

waltky

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Emergent gravity may explain dark matter...
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New theory of gravity might explain dark matter
November 8, 2016 - A new theory of gravity might explain the curious motions of stars in galaxies. Emergent gravity, as the new theory is called, predicts the exact same deviation of motions that is usually explained by invoking dark matter. Prof. Erik Verlinde, renowned expert in string theory at the University of Amsterdam and the Delta Institute for Theoretical Physics, published a new research paper today in which he expands his groundbreaking views on the nature of gravity.
In 2010, Erik Verlinde surprised the world with a completely new theory of gravity. According to Verlinde, gravity is not a fundamental force of nature, but an emergent phenomenon. In the same way that temperature arises from the movement of microscopic particles, gravity emerges from the changes of fundamental bits of information, stored in the very structure of spacetime.

Newton's law from information

In his 2010 article (On the origin of gravity and the laws of Newton), Verlinde showed how Newton's famous second law, which describes how apples fall from trees and satellites stay in orbit, can be derived from these underlying microscopic building blocks. Extending his previous work and work done by others, Verlinde now shows how to understand the curious behaviour of stars in galaxies without adding the puzzling dark matter. The outer regions of galaxies, like our own Milky Way, rotate much faster around the centre than can be accounted for by the quantity of ordinary matter like stars, planets and interstellar gasses. Something else has to produce the required amount of gravitational force, so physicists proposed the existence of dark matter. Dark matter seems to dominate our universe, comprising more than 80 percent of all matter. Hitherto, the alleged dark matter particles have never been observed, despite many efforts to detect them.

newtheoryofg.gif

No need for dark matter

According to Erik Verlinde, there is no need to add a mysterious dark matter particle to the theory. In a new paper, which appeared today on the ArXiv preprint server, Verlinde shows how his theory of gravity accurately predicts the velocities by which the stars rotate around the center of the Milky Way, as well as the motion of stars inside other galaxies. "We have evidence that this new view of gravity actually agrees with the observations, " says Verlinde. "At large scales, it seems, gravity just doesn't behave the way Einstein's theory predicts." At first glance, Verlinde's theory presents features similar to modified theories of gravity like MOND (modified Newtonian Dynamics, Mordehai Milgrom (1983)). However, where MOND tunes the theory to match the observations, Verlinde's theory starts from first principles. "A totally different starting point," according to Verlinde.

Adapting the holographic principle

One of the ingredients in Verlinde's theory is an adaptation of the holographic principle, introduced by his tutor Gerard 't Hooft (Nobel Prize 1999, Utrecht University) and Leonard Susskind (Stanford University). According to the holographic principle, all the information in the entire universe can be described on a giant imaginary sphere around it. Verlinde now shows that this idea is not quite correct—part of the information in our universe is contained in space itself. This extra information is required to describe that other dark component of the universe: Dark energy, which is believed to be responsible for the accelerated expansion of the universe. Investigating the effects of this additional information on ordinary matter, Verlinde comes to a stunning conclusion. Whereas ordinary gravity can be encoded using the information on the imaginary sphere around the universe, as he showed in his 2010 work, the result of the additional information in the bulk of space is a force that nicely matches that attributed to dark matter.

On the brink of a scientific revolution

Gravity is in dire need of new approaches like the one by Verlinde, since it doesn't combine well with quantum physics. Both theories, crown jewels of 20th century physics, cannot be true at the same time. The problems arise in extreme conditions: near black holes, or during the Big Bang. Verlinde says, "Many theoretical physicists like me are working on a revision of the theory, and some major advancements have been made. We might be standing on the brink of a new scientific revolution that will radically change our views on the very nature of space, time and gravity."

New theory of gravity might explain dark matter

See also:

Emergent Gravity and the Dark Universe
 

SixFoot

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How does mass bend spacetime by simply being there?

What is the force being applied to spacetime that causes the warping?

Where is the force originating from?

What is the force behind the warping of spacetime?

What is gravity?


I understand that gravity is what happens when spacetime is warped, but I don't understand what is warping it. Mass? Mass in motion? Mass in stand-still?

Is there even any? Why or why not?



Fellow science enthusiasts?
 
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trevorjohnson32

trevorjohnson32

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How does mass bend spacetime by simply being there?

What is the force being applied to spacetime that causes the warping?

Where is the force originating from?

What is the force behind the warping of spacetime?

What is gravity?


I understand that gravity is what happens when spacetime is warped, but I don't understand what is warping it. Mass? Mass in motion? Mass in stand-still?

Is there even any? Why or why not?



Fellow science enthusiasts?

The same concept of a ball warping a piece of cloth stretched out to create gravity is represented by the picture in the video. I just took that two dimensional drawing and made it 3d.
 

Theowl32

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Check out this. Gravity visualized. Pretty fascinating stuff

 

SixFoot

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How does mass bend spacetime by simply being there?

What is the force being applied to spacetime that causes the warping?

Where is the force originating from?

What is the force behind the warping of spacetime?

What is gravity?


I understand that gravity is what happens when spacetime is warped, but I don't understand what is warping it. Mass? Mass in motion? Mass in stand-still?

Is there even any? Why or why not?



Fellow science enthusiasts?

The same concept of a ball warping a piece of cloth stretched out to create gravity is represented by the picture in the video. I just took that two dimensional drawing and made it 3d.

I get the concept, but I don't get the cause of the warping. The warping causes the gravity, but what exactly is causing the warping?
 
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trevorjohnson32

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I get the concept, but I don't get the cause of the warping. The warping causes the gravity, but what exactly is causing the warping?

Warping is a 2 dimensional view of gravity. In a 3 dimensional view space time would be denser the closer to the mass causing gravity. My idea is that the particles of mass causing gravity, protons and neutrons, are made up of super dense space time and there density puts a squeeing force in the surrounding space time causing the density and the gravity field.
 

SixFoot

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I get the concept, but I don't get the cause of the warping. The warping causes the gravity, but what exactly is causing the warping?

Warping is a 2 dimensional view of gravity. In a 3 dimensional view space time would be denser the closer to the mass causing gravity. My idea is that the particles of mass causing gravity, protons and neutrons, are made up of super dense space time and there density puts a squeeing force in the surrounding space time causing the density and the gravity field.

What is the force behind the density that causes this squeezing?
 
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trevorjohnson32

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What is the force behind the density that causes this squeezing?

In my theory, the force spreading out from the small particles of super dense space-time is similar to thermal energy. Like an ice cube cooling a drink. Density in space time is a reaction to the density of the super small particles of matter. Between two gravity fields, space-time latches and pulls two objects together as a result of this force.
 

Chuz Life

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What is the force behind the density that causes this squeezing?

In my theory, the force spreading out from the small particles of super dense space-time is similar to thermal energy. Like an ice cube cooling a drink. Density in space time is a reaction to the density of the super small particles of matter. Between two gravity fields, space-time latches and pulls two objects together as a result of this force.

Interesting theory but I prefer my own.

In my theory, Gravity is simply the result of the cumulative magnetic properties of all of the atoms contained in matter. The more mass, the more atoms, the higher the concentration, the more gravity, etc.
 
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trevorjohnson32

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I know longer believe in a conductive grid, aether or time as a dimension.

My latest view on the video is that the image is of the top view of the experiment in post 5. This is the correct view, not the bending from the side view, space isn't bent by gravity. Instead it is squeezed upon by the atomic nucleus so as to resemble the image in the OP. The top view is the correct view because it is a 2D experiment that only works because of the gravity below the sheet of fabric, otherwise the objects would just float away from each other. The bottom view and the side view of bending are null and the topview is in line with the surface of the gravity field.
 
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Grumblenuts

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What is gravity?
Paraphrasing where not quoting Ken Wheeler: Gravity is an anti-field. What is a field? A field is an Aether perturbation modality. Think temperature, pressure, static electricity.. Gravity is the opposite. A field terminal, ground, eraser. Think black hole, electrical ground, dielectric plane. Whereas, magnetism is dielectric acceleration (space creation), gravity erases space or more particularly spatial attributes, i.e. causes loss of dielectric inertia, acceleration toward counterspace.

Just me now. Thinking about Earth, obviously its magnetic and gravitational attributes don't perfectly match or line up, but throw in gyroscopic precession and the Moon's gravity effects and perhaps it all begins to work out as the same. Add the Sun, planets, imperfect spherical shape, etc. Though there's likely no black hole at the Earth's center, it does have magnetic poles so there must also be a dielectric plane bisecting the North and South halves.

 

ChemEngineer

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"Spacetime" - oh please.

Hello, this is your doctor's office. We have you scheduled for 3 PM spacetime tomorrow.
We look forward to seeing you in our space at that time.
 
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trevorjohnson32

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"Spacetime" - oh please.

Hello, this is your doctor's office. We have you scheduled for 3 PM spacetime tomorrow.
We look forward to seeing you in our space at that time.
What if I'm a dog and I find something by sense of smell, does that mean dogs have a 5th dimension of locating something?
 

ChemEngineer

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What if I'm a dog and I find something by sense of smell, does that mean dogs have a 5th dimension of locating something?

"This isn't right. It's not even wrong." - Wolfgang Pauli
 
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trevorjohnson32

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Paraphrasing where not quoting Ken Wheeler: Gravity is an anti-field. What is a field? A field is an Aether perturbation modality. Think temperature, pressure, static electricity.. Gravity is the opposite. A field terminal, ground, eraser. Think black hole, electrical ground, dielectric plane. Whereas, magnetism is dielectric acceleration (space creation), gravity erases space or more particularly spatial attributes, i.e. causes loss of dielectric inertia, acceleration toward counterspace.

Just me now. Thinking about Earth, obviously its magnetic and gravitational attributes don't perfectly match or line up, but throw in gyroscopic precession and the Moon's gravity effects and perhaps it all begins to work out as the same. Add the Sun, planets, imperfect spherical shape, etc. Though there's likely no black hole at the Earth's center, it does have magnetic poles so there must also be a dielectric plane bisecting the North and South halves.

Dr. Nuts,

Do you see what I'm saying about the the visual comparison between the image in the OP vs the experiment in post 5? Space isn't bent like Einstein says but is compressed.
 

Wuwei

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How does mass bend spacetime by simply being there?

What is the force being applied to spacetime that causes the warping?

Where is the force originating from?

What is the force behind the warping of spacetime?

What is gravity?


I understand that gravity is what happens when spacetime is warped, but I don't understand what is warping it. Mass? Mass in motion? Mass in stand-still?

Is there even any? Why or why not?



Fellow science enthusiasts?
The OP video is wrong.

You are asking questions that are not answerable the way they are posed. General relativity makes one basic assumption: gravitational force on a mass is indistinguishable from the force of inertial resistance when a mass is being pushed.

The math behind that simple assumption leads to warped geometries. The math does not explain anything, it just describes the behavior. That is all that can be known at this point.
.
 

Grumblenuts

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Do you see what I'm saying about the the visual comparison between the image in the OP vs the experiment in post 5? Space isn't bent like Einstein says but is compressed.
Yes, but I see it as the Aether getting compressed, not space or time. Space has no properties so no potential to do anything. Space and counterspace are necessarily comprised of the Aether. It provides the medium, thus the basic potential for all energy exchange, as water is obviously required to produce water surface waves.

Indeed, I see gravity as a relatively weak force field resulting from matter somewhat displacing The Aether, rarifying its average local density. The weak resultant vacuum causes The Aether to push toward the center ("anti-field") of all masses, building up (being compressed) around surfaces and experiencing loss of inertia there. Le Sage theory. This Aether build up distorts light around massive objects.
It is absurd to suppose that gravity is innate and acts without a medium, either material or immaterial -- Sir Isaac Newton, 1690
 
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trevorjohnson32

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Yes, but I see it as the Aether getting compressed, not space or time. Space has no properties so no potential to do anything. Space and counterspace are necessarily comprised of the Aether. It provides the medium, thus the basic potential for all energy exchange, as water is obviously required to produce water surface waves.

Indeed, I see gravity as a relatively weak force field resulting from matter somewhat displacing The Aether, rarifying its average local density. The weak resultant vacuum causes The Aether to push toward the center ("anti-field") of all masses, building up (being compressed) around surfaces and experiencing loss of inertia there. Le Sage theory. This Aether build up distorts light around massive objects.
That's crazy that you are an old school aetherist. I 've never met one. My thoughts on the aether that I once avidly supported, is that space IS the aether. There's no need for a lining of a substance. All the effects of the aether are effects on space. Space as a medium that is unbreakable into smaller constituent parts would explain why object's don't emit gravity waves behind them when moving through space. Also when energy is stored into particle form, it keeps its shape. As well as further evidence in magnetic fields, I would say the universe is a one and can't be broken down. The medium of space is different in properties then other medium's because of these reasons.
 
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All in your mind
Warping is a 2 dimensional view of gravity. In a 3 dimensional view space time would be denser the closer to the mass causing gravity. My idea is that the particles of mass causing gravity, protons and neutrons, are made up of super dense space time and there density puts a squeeing force in the surrounding space time causing the density and the gravity field.
An Action Must Have an Agent.

"Space-time" is an irrational concept derived from decadent Postclassical imagination. Gravity starts in the outside universe, which interacts with our own, and it ends back here. Outside its effect, the graviton is hidden from view.
 

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