Chinese scientists find evidence for speed of gravity

[KRAIT]

No Krait
Quantum theory is related to particle nature of light,

What about Schrodinger's wave equation ? Seems like I have been away from QT for a long time.


According to Einstein's quantum theory of light, a monochromatic light-wave of angular frequency , propagating through a vacuum, can be thought of as a stream of particles, called photons, of energy.

http://farside.ph.utexas.edu/teaching/qmech/lectures/node19.html.

 

[Srinivas]

What Krait sleeping late today??

What about Schrodinger's wave equation ? Seems like I have been away from QT for a long time.

Little brush up of concepts will do good for you

 

[KRAIT]

What Krait sleeping late today??
Little brush up of concepts will do good for you

Not yet. Within an hour may be.

 

[Srinivas]

What about Schrodinger's wave equation ? Seems like I have been away from QT for a long time.


According to Einstein's quantum theory of light, a monochromatic light-wave of angular frequency , propagating through a vacuum, can be thought of as a stream of particles, called photons, of energy.

Quantum theory of light.

Quantum theory is proposed to explain the phenomena of light radiation and its measurement.

According to the schrodingers equations

Quantization
The Schrödinger equation predicts that if certain properties of a system are measured, the result may be quantized, meaning that only specific discrete values can occur. One example is energy quantization: the energy of an electron in an atom is always one of the quantized energy levels, a fact discovered via atomic spectroscopy. (Energy quantization is discussed below.) Another example is quantization of angular momentum. This was an assumption in the earlier Bohr model of the atom, but it is a prediction of the Schrödinger equation.

Not every measurement gives a quantized result in quantum mechanics. For example, position, momentum, time, and (in some situations) energy can have any value across a continuous range.

Quantization means making infinite number of states of a particle into finite number of states. This will simplify the calculations .

Not yet. Within an hour may be.

I will be late to bed today

 

[Juice]

It would have to refer to the speed of "gravitons," and measured with a moving body in a field....because in cases like the sun's effect on earth it appears "continous" and instantanous. Even using another body moving in the field is difficult (such as effects of venus on earth as it peeks around the sun) would be hard, because the field already "exist"....and its movement is "instantanous" with the movement of the body.

 

[Chinese-Dragon]

the source must have published something wrong..gravity is referred by acceleration which is rate of change of speed.the term "speed of gravity is absurd" may be it has to say rate of change of gravity

Come on man, at least think about it for half a second before putting it down.

At least use Wikipedia if you can't be bothered to look for anything else:

Speed of gravity - Wikipedia, the free encyclopedia

 

[Skull and Bones]

Have they got enough evidence to prove it, because the speed of Gravity has been equated with the speed light on many theoretical calculations, specially in deriving the Unification theory. And in one documentary, Michio Kaku said the same.

 

[Vassnti]

What about Schrodinger's wave equation ? Seems like I have been away from QT for a long time.


According to Einstein's quantum theory of light, a monochromatic light-wave of angular frequency , propagating through a vacuum, can be thought of as a stream of particles, called photons, of energy.

.

Love Schrodinger

A little like having general relitivity and newtonian physics in a box and not wanting to open it just incase the earth realises its orbit is unstable

 

[Srinivas]

Have they got enough evidence to prove it, because the speed of Gravity has been equated with the speed light on many theoretical calculations, specially in deriving the Unification theory. And in one documentary, Michio Kaku said the same.

It is not yet clear mate the research is in primitive state. Chinese claims needs some confirmation.

 

[XTREME]

In December 2012, a research team in China announced that it had produced findings which seem to prove that the the speed of gravity is equal to the speed of light. The team's findings were due to be released in a journal in 2013.

Source: WikiPedia

 

[Jade]

Nothing new....General relativity predicts that the speed of a gravitational wave is equal to the speed of light. Since then there were many attempts to prove this prediction, but all resulting in failures. Let us see whether the efforts by Chinese will stand the scrutiny. But coming from Chinese I would take this with a pinch of salt

 

[neehar]

Come on man, at least think about it for half a second before putting it down.

At least use Wikipedia if you can't be bothered to look for anything else:

Speed of gravity - Wikipedia, the free encyclopedia

my bad..thnx..in my 4 yrs of mech eng..i did not come across this term...though it belonged to newtonian mechanics..but now i know it's quantum mechanics hence i never knew..

No, this is not about the typical formula we've learned in general physics, where it measures the acceleration of an object under gravitational force. Instead, this is about how fast can gravity reaches an object.



Here are some more articles.

Chinese Scientists Measure Speed of Gravity

Gravity travels at speed of light Chinese research reveals

thnx.i thought it belonged to classical phy..now i knw its related to quantum phy...so dnt knw abt it

a little learning is a dangerous thing!

This gives you and other ignoranmus who has made stupid accusations an idea of what the article is about:

Speed_of_gravity



the above links by the OP are just very basic introductions. Anyone who is serious in knowing the full process of experiment and the result has to read the paper carried by the German publisher or wait until Jan 2013 release on Chinese Science Bulletin!

Great Discovery nonetheless!

got it.thnx i thought it belonged to classical phy..

 

[OrionHunter]

By applying the new data to the propagation equation of gravity, the team found that the speed of gravity is about 0.93 to 1.05 times the speed of light with a relative error of about 5 percent, providing the first set of strong evidence showing that gravity travels at the speed of light.

How can anything in the universe travel FASTER than the speed of light? This is a bunch of unmitigated nonsense!

Secondly, the gravitational equation says that the force of gravity is proportional to the product of the two masses (m1 and m2), and inversely proportional to the square of the distance (r) between their centers of mass. Mathematically speaking,

F=Gm1m2 / r2,

where G is called the Gravitational Constant. It has a value of 6.6726 x 10-11 m3 kg-1 s-2.

Gravity is present everywhere in space thanks to Dark Matter which is responsible for mass in the universe. More the mass of an object, more the gravity. Where does speed come in?

The 'speed' of gravity doesn't figure in this at all. If the Chinese are correct, then we need to revisit this formula too.

A significant fact, usually overlooked, is that Newton’s law of gravity does not involve time.

Gravity must act instantly for the planets to orbit the Sun in a stable fashion. If the Earth were attracted to where the Sun appears in the sky, it would be orbiting a largely empty space because the Sun moves on in the 8.3 minutes it takes for sunlight to reach the Earth. If gravity operated at the speed of light all planets would experience a torque that would sling them out of the solar system in a few thousand years.

So much for the so called 'speed' of gravity!

 

[Sedqal]

How can anything in the universe travel FASTER than the speed of light? This is a bunch of unmitigated nonsense!

Speed of gravitational wave is equal to speed of light (atleast in theory). Why would you assume that its impossible for speed of gravitational force to be greater then light?

 

[Jade]

Speed of gravitational wave is equal to speed of light (atleast in theory). Why would you assume that its impossible for speed of gravitational force to be greater then light?

It is not to say that things cannot go faster than light. They may go. Weird things keep happening in the Universe. But Physics as we know cannot explain things that go faster than light. We need new theories.