[Profpat]

Originally Posted by Tina Is that YOU profpat? Greybeard has a Halloween suprise for you so Happy Halloween from me too!

No Tina it's not me, you can see a picture of me at Cosvis ( RP ) Holy Man site.

Are you going to PM me with your youtube site?

Best to all'

Pat

[Drifter]

Very apropos Professor

You define-It-ly got the point, Sir.

crystal-balls and hallo-weenies prof =O)

[Tina]

Originally Posted by Profpat No Tina it's not me, you can see a picture of me at Cosvis ( RP ) Holy Man site. Are you going to PM me with your youtube site? Best to all' Pat

I've seen the Covis offering!!! Don't let that thing near my forum on the Root of Evil - I may be forced to lose my concentration.

Graybeard is messaging you I think with YT details.

[NotStein]

Originally Posted by dipayankar That's good 'The ghost of the mass'. Another silly question, Why does not EM waves require medium to travel? if photon is energy and does not have mass, it should require a medium like ether to travel. But we know ether does not exist...

Maybe EM waves do require a medium to travel in. Article after article talks about the 'virtual bubbling sea' of 'potential' particles, that real particles pop in & out of. It's either there or not; Quantum loop theory speaks of a mesh of looped whatzits quantizing the minimum discrete elements of distance and time. Again, it's either there or not. From another viewpoint, all energetic moving phenomena from atomic explosions, comets (tails), and the big bang degrade as they progress. Heisenburg's principle demands it; They leave detrius behind. In the case of the big bang, I just feel that the detrius left behind we happen to call space-time. It's either there or not. If it's there, it's a medium. If it's a medium, it constrains the speed of light (EM).

Jeff


Jeff

[Profpat]

[quote=NotStein;37965]Maybe EM waves do require a medium to travel in. Article after article talks about the 'virtual bubbling sea' of 'potential' particles, that real particles pop in & out of. It's either there or not; Quantum loop theory speaks of a mesh of looped whatzits quantizing the minimum discrete elements of distance and time. Again, it's either there or not. From another viewpoint, all energetic moving phenomena from atomic explosions, comets (tails), and the big bang degrade as they progress. Heisenburg's principle demands it; They leave detrius behind. In the case of the big bang, I just feel that the detrius left behind we happen to call space-time. It's either there or not. If it's there, it's a medium. If it's a medium, it constrains the speed of light (EM).

Hi Jeff;

Welcome back.

You are right about some form of ether being out there. Not the conceptual idea from Plato and Aristotle, as it being the 5th element, but rather real stuff.

A little research I did:

Such a view, however, contradicts the continuum concept of space-time and fields and Einstein's statements in "Aether and the Theory of Relativity", May 5th, 1920:
"More careful reflection teaches us, however, that the special theory of relativity does not compel us to deny ether." and "To deny the ether is ultimately to assume that empty space has no physical qualities whatever".
As to the idea of "historical" aether theories it has to be decided, which "historical" theory out of many may adequately be currently taught?

[edit] Aether and quantum mechanics

Quantum mechanics can be used to describe spacetime as being "bitty" at extremely small scales, fluctuating and generating particle pairs that appear and disappear incredibly quickly. Instead of being "smooth", the vacuum is described as looking like "quantum foam". It has been suggested that this seething mass of virtual particles may be the equivalent in modern physics of a particulate aether.

As you can see even Einstein rethought his original thoughts regarding the ether.

Best to you,

Pat

[dipayankar]

Good way of putting it across. However since we do see the propagation of EM waves, therefore the detrius from Big Bang does exist in the form of space time, and yes probably EM waves uses these mediums...

Originally Posted by NotStein Maybe EM waves do require a medium to travel in. Article after article talks about the 'virtual bubbling sea' of 'potential' particles, that real particles pop in & out of. It's either there or not; Quantum loop theory speaks of a mesh of looped whatzits quantizing the minimum discrete elements of distance and time. Again, it's either there or not. From another viewpoint, all energetic moving phenomena from atomic explosions, comets (tails), and the big bang degrade as they progress. Heisenburg's principle demands it; They leave detrius behind. In the case of the big bang, I just feel that the detrius left behind we happen to call space-time. It's either there or not. If it's there, it's a medium. If it's a medium, it constrains the speed of light (EM). Jeff Jeff

[Profpat]

Originally Posted by dipayankar Good way of putting it across. However since we do see the propagation of EM waves, therefore the detrius from Big Bang does exist in the form of space time, and yes probably EM waves uses these mediums...

Hi Dipayankar;

I believe Jeff was refering to Hawkings Black Hole Formula;


Black hole entropy
Black hole entropy is the entropy carried by a black hole.
If black holes carried no entropy, it would be possible to violate the second law of thermodynamics by throwing mass into the black hole. The only way to satisfy the second law is to admit that the black holes have entropy whose increase more than compensates for the decrease of the entropy carried by the object that was swallowed.
Starting from theorems proved by Stephen Hawking, Jacob Bekenstein conjectured that the black hole entropy was proportional to the area of its event horizon divided by the Planck area. Later, Stephen Hawking showed that black holes emit thermal Hawking radiation corresponding to a certain temperature (Hawking temperature). Using the thermodynamic relationship between energy, temperature and entropy, Hawking was able to confirm Bekenstein's conjecture and fix the constant of proportionality at 1/4:
where k is Boltzmann's constant, and is the Planck length. The black hole entropy is proportional to its area A. The fact that the black hole entropy is also the maximal entropy that can be squeezed within a fixed volume was the main observation that led to the holographic principle. The subscript BH either stands for "black hole" or "Bekenstein-Hawking".
Although Hawking's calculations gave further thermodynamic evidence for black hole entropy, until 1995 no one was able to make a controlled calculation of black hole entropy based on statistical mechanics, which associates entropy with a large number of microstates. In fact, so called "no hair" theorems appeared to suggest that black holes could have only a single microstate. The situation changed in 1995 when Andrew Strominger and Cumrun Vafa calculated the right Bekenstein-Hawking entropy of a supersymmetric black hole in string theory, using methods based on D-branes. Their calculation was followed by many similar computations of entropy of large classes of other extremal and near-extremal black holes, and the result always agreed with the Bekenstein-Hawking formula.

Best to all,

Pat

[dipayankar]

Okay I got the point...

Originally Posted by Profpat Hi Dipayankar; I believe Jeff was refering to Hawkings Black Hole Formula; Black hole entropy Black hole entropy is the entropy carried by a black hole. If black holes carried no entropy, it would be possible to violate the second law of thermodynamics by throwing mass into the black hole. The only way to satisfy the second law is to admit that the black holes have entropy whose increase more than compensates for the decrease of the entropy carried by the object that was swallowed. Starting from theorems proved by Stephen Hawking, Jacob Bekenstein conjectured that the black hole entropy was proportional to the area of its event horizon divided by the Planck area. Later, Stephen Hawking showed that black holes emit thermal Hawking radiation corresponding to a certain temperature (Hawking temperature). Using the thermodynamic relationship between energy, temperature and entropy, Hawking was able to confirm Bekenstein's conjecture and fix the constant of proportionality at 1/4: where k is Boltzmann's constant, and is the Planck length. The black hole entropy is proportional to its area A. The fact that the black hole entropy is also the maximal entropy that can be squeezed within a fixed volume was the main observation that led to the holographic principle. The subscript BH either stands for "black hole" or "Bekenstein-Hawking". Although Hawking's calculations gave further thermodynamic evidence for black hole entropy, until 1995 no one was able to make a controlled calculation of black hole entropy based on statistical mechanics, which associates entropy with a large number of microstates. In fact, so called "no hair" theorems appeared to suggest that black holes could have only a single microstate. The situation changed in 1995 when Andrew Strominger and Cumrun Vafa calculated the right Bekenstein-Hawking entropy of a supersymmetric black hole in string theory, using methods based on D-branes. Their calculation was followed by many similar computations of entropy of large classes of other extremal and near-extremal black holes, and the result always agreed with the Bekenstein-Hawking formula. Best to all, Pat

[MJA]

Compactifications
F-theory is formally a 12-dimensional theory, but the only way to obtain an acceptable background is to compactify this theory on a two-torus. By doing so, we obtain type IIB superstring theory in 10 dimensions. The SL(2,Z) S-duality symmetry of the resulting type IIB string theory is manifest because it arises as the group of large diffeomorphisms of the two-dimensional torus.
More generally, one can compactify F-theory on an elliptically fibered manifold (elliptic fibration), i.e. a fiber bundle whose fiber is a two-dimensional torus (also called an elliptic curve). For example, a subclass of the K3 manifolds is elliptically fibered, and F-theory on a K3 manifold is dual to heterotic string theory on a two-torus. (Eight dimensions are large.

Sorry, but this stuff has absolutely no relevance, certainty, simplicity, or truth.

=
MJA

PS: Nonsense

[Drifter]

I think I just had a brain anurism.