Einstein Definition and 811 Threads

I'm reading a text on tensor analysis (on R³), and I don't understand the following exemple... P=\frac{1}{2}(a_{ij}+a_{ji})x_ix_j=\frac{1}{2}(a_{ij}x_ix_j+a_{ij}x_jx_i)=a_{ij}x_ix_j To pass from the second to the last equality, he commuted the second pair of x_jx_i into x_ix_j. But he...

If you can derive the Eisntein equations from: L=\int_{V} d^{4}x\sqrt (-g)R but does L has a potential term so we can do Qm with it?..:confused: :confused:

The constancy of the speed of ligth is a result of the Maxwell's equations. And the Lorentz transformation is an invariance of Maxwell's theory that was known before the special theory of relativity was discovered. Why and how did the physics of the 19th century (particularly Maxwell) built...

Recently, I have realized how much did Einstein contributed, indirectly, to the field of QM. I mean, using his two famous relations E=mc^2 (relativity) and E=hf (photoelectric effect), we derived the relation p = \frac{h}{\lambda}. Then, by the help of a keen insight from de Broglie, we...

That is, why did he use signals whose speed is invariant?

In "Frozen Light" an article written by Lene Vestegaard Hau, it talks about Lene's experiments with, literally, slowing down light by way of passing it through "ultra-cold clouds of atoms." The experiment was undertaken at Cambridge and Lene and a group of researchers were able to get light's...

[PLAIN][/URL] marlon

Just wondered if anyone had any good links or recommended books on Einstein's unification theory. I've tried searching the web but usually all that pops up was that his theory was a failure. My interest is where exactly he went wrong & perhaps even some of his mathematics. I figure the...

If we have the Einstein Lagrangian... L= \sqrt (-g)R my question is how do you get the Hamiltonian?..the approach by Wheeler-De Witt is to consider the line element: ds^2 = N(t)dt^^2 + g_ij dx^i dz^ j (Einstein sum convention) and then substitute it into the Lagrangian above and perform...

This issue came up in a recent thread and I recall that it came up in another thread about a year ago. I think it deserves its own thread. If it already has one and you know of it, please direct me to it. Does acceptance of Einstein's theory entail rejection of Newton's? On page 98 of...

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I really enjoyed this paper so I thought I would share.

Dear friends, I have asked the following question before, but I am not still satisfied with the answer given by the experts of this forum. In Einstein equation E=m/c2 ¿ Does E equal to the thermodynamic internal energy of matter plus kinetic energy plus potential energy of a system?. ¿...

...had taken up the offer of becoming president of Israel in 1952, would things have been different? I think so. Imagine, he could do some theoretorising on higher dimensions, finding a way in which space could be inhabited by both parties at the same time... Of course, this wouldn't be...

Who is more important for Physics World, Newton or Einstein? And why? Who do you think is more intelligent based on each one's contributions to science and level of difficulty they discovered?

http://www.scienceagogo.com/news/19980907140525data_trunc_sys.shtml :smile: That's strange.

are there any posters of both Albert einstein and neils bohr? being two of the greatest minds of the 20th century, and the dichotomy between them... i think the poster would say a lot. plus, einstein is my favorite physicist. so, if you know of any, id like to buy one. thanks!

hi! i have a question. can you help me answer it? i have studied physics about the equation E=mc^2. i know that everybody who studying physics know it. can some body show me how he got there? what maths mean that he used to reach that? i wonder if it is really complex? thanks!

http://arxiv.org/PS_cache/gr-qc/pdf/0505/0505099.pdf Franklin Felber says in this paper that for the first time has obtained the solution of the orbits of a particle near an ultrarelativistic central field (in second order of aproximation). This leads to the gravitomagnetic...

Hello, I am trying to teach myself quantum mechanics so take it easy on me. In 1905, Einstein proposed that light is made of photons and that each photon carries energy E = hf (f is frequency) and momentum p = h/w (where w is wavelength) My question is how did he go from the...

What do you guys think of this site? http://www.relativitychallenge.com/mistakes.htm" Is there anything to this?

The famous Einstein quiz: Einstein said that 98% of the people in the world cannot solve his riddle. Facts: 1: There are 5 houses in 5 different colors 2: In each house lives a person with a different nationality. 3: These 5 owners drink a certain beverage, smoke a certain brand of...

What is it?

Did Einstein like the term "Relativity"? I know that Einstein referred to “Relativity” when he wrote or talked about his theories, but is it true that Einstein was not originally fond of the term “Relativity” to describe his theories by that name? I have found in a couple German publications...

The "Einstein Mith" NOw that we are in 2005 the so claimed year of physics, perhaps is time to speak about some of its greatest miths.. Einstein:= the proud discoverer of relativity,photoelectric effect and other...in fact did you know that the einstein formulation of Specific heat is not...

This to me means that everything is moving *through space* in some form or another. If we can calculate a slowest object it would be like finding a fastest time. Einstein dared not say it. If moving through space is what slows time then time can be both absolute and relative. The Fastest...

Garth has mentioned a few times in another context that Gravity Probe B is examining whether or not a rotating mass creates a distortion in space-time in the way that Einstein's General theory of relativity predicts. (Good luck Garth for SSC… My money’s on Einstein, though…!) I wonder if...

Please forgive me if I put this in the wrong forum, but I couldn't help but wonder...you know that UFOs defy the laws of physics, right? Well, What would Einstien say about UFOs?

I've been very much intrigued by this picture of the surface tension of water supporting a metal paperclip: http://www.visions-of-science.co.uk/winners2005/win-18.htm" "By photographing it using a grill in front of the light source, the deformation of the water caused by the clip's weight...

The recent PBS special, Einstein's Big Idea, is well worth watching (it's a history of e = mc^2). One reason is that in the first hour, it traces the historical development of the concepts of mass, energy, electricity and magnetism and electromagnetism in the 1700's and 1800's. One item of...

what about maxwell's equations/theroy states that the speed of light is constant in all refrence frames? (how'd enstien figure that to be true)

Given U^k_i, the components of U is a delta function i.e for i=k U^i_k =1, to prove it is invariant under Lorentz transformation~~ I don't know how to express it in Einstein summation notation, I am very confused with the upper-lower index, is it right to write the transformation in this...

In Volume 26, Number 6, November 2005 issue of European Journal of Physics, there is a special section dedicated to "Einstein and a Century of Time". There are several papers that discuss the historical issues of Einstein's work in SR and GR, and beyond... These papers are available FREE for...

I'm heading to this year's Nobel Conference in Minnesota. The topic is the Legacy of Einstein and the panels will consist of scientists in the areas of statistical physics, relativity, cosmology, and unified theories, who will discuss current work in the areas of Einstein's greatest...

I have to do a project in relation to Einstein on geo-reactors. What is a geo-reactor and what did Einstein say about it??Where can I find out more? Thanx

Einstein’s research works are final outcomes of hard work of many other people http://lorentz.phl.jhu.edu/AnnusMirabilis/AeReserveArticles/ed_str.pdf

I came across a rather interesting website: [PLAIN ]http://www.relativitychallenge.com/index.htm [/URL] Steven Bryant explains how several of Einstein's equations that support the theory of Special Relativity are in error. He goes as far as to correct them and create a revised model he...

This site was linked at the top of the physics forums website. www.relativitychallenge.com I guess everybody has freedom of speech. Do people just get a kick out of proving Einstein wrong?

Read ALL of it: http://www.spaceandmotion.com/Theology-Albert-Einstein.htm BEFORE you reflect. This man has thought far too deeply and he must have read many books. If everyone on Earth developed this understanding there would be no need for so many religions and human unification...

I'm sure most of you have heard of the Einstein Referigeration Cycle . For those who have not I've listed the references for further reading.. http://www.me.gatech.edu/energy/pubs/SLA_2.pdf ok 342 K is about 156 F ,for anyone with an attic , it seems to me that this is the perfect solution to...

This guy is starting to get on my nerves. I should have guess that he was a creationist by the way he posts. He makes obviously wrong claims and gives no evidence for them. Not only does he give no evidence he does the creationist "Ignore all evidence to the opposite of what I am trying to say"...

Why did Einstein choose to define speed of light as a constant and time as a "variable" (relative to motion), rather than the reverse? I am aware of experimental results confirming constant speed of light and time dilation. But Einstein did not have those results at the time he proposed SR as...

Hello I am a teachers assistant for a one week summer camp class entitled "Time Space and Einstein" and are in ideas for demonstratiosn for the class. The class consists of students going into 6-8th grade. Anything that you think could keep the attention of kids who don't like equations or...

One morning Einstein was walking through beautiful rolling meadows and noticed that 3 cows were munching grass. What surprised him was that the cows had their heads through an electric fence mowing the grass that was on the neighbors field. The electric fence was supposed to prevent the cows...

I've a question here, is there a way to derive m'= \gamma m ? So far, i have not seen any derivation to this. I have heard that relativistic mass is a definition, but how did Einstein thought of this?

Hi, I need some help on a paper I'm writing about Newton versus Einstein. Basically I have to prove that Newton is the greatest physics person alive. I researched a lot online and found that Einstein basically copied Newton's findings and added the fourth dimension to make it look it was his...

hi, can anyone tell me where can i get 'Young Einstein' by Patrick Pringle on the net for free?

"I came to America because of the great, great freedom which I heard existed in this country. I made a mistake in selecting America as a land of freedom, a mistake I cannot repair in the balance of my life." I wonder because with all the anti-American people I've known, i have yet to hear...

Here I'd like to present theories of professor of physico-chemistry, Ph.D. Najip Valitov from Russia, who discovered new theories after Einstein. Part of his discoveries are described in his web-page: [PLAIN]www.bashedu.ru/ValitovNKH.htm[/URL] In 1972 professor Valitov, who lived in the...

Hello all, I have a quick question on Einstein notation. I'll write the tensors as a capital letter and the covariant indices as lower case letters (and not use anything that has contravariant indices). I'll also use != for not equal or not congruent to. In Schaum's outline of tensor...