Einstein Definition and 809 Threads

Is this the right place to discuss Bose Einstein condensate.

Einstein v. Wheeler's Black Holes John Wheeler who died earlier this month (13 April) not only coined the term 'black hole', but is of course closely identified with the very concept of a gravitationally collapsed object. So he surely carries much of the blame for the basic deviation...

I could do with some help understanding this. That einstein photon particle energy equation E=hf Considering the mimimum energy ( Planck energy ) set E = h That means f=1 What? Is the f dimension in 1/sec? It can't be right. Why would the minimum (planck) frequency happen to be 1 per...

Homework Statement I have a paper due Friday in ap Physics and i can't seem to find anything on the subject that doesn't involve reading an entire textbook. Ok so we first must compare/contrast Newtonian & Einstein Physics, then explain their contributions to Quantum mechanics. The...

Homework Statement If I have two Einstein solids A and B with oscillators N_A N_B and they share a total of 20 energy units. I want to find the width of the function that describes the multiplicity for this system. How do I find this? - I have an expression in my book (Thermal Physics by...

can anyone give me the webpage link of this paper by Einstein Einstein, Albert, 1911, "On the Influence of Gravity on the Propagation of Light", Annalen der Physik, 35: 898–90 I heard that in this paper Einstein tells that velocity of light is changed by gravitational field...i want to...

What are the appropriate units for the left half of the GR equation? Meters? square meters..? To put it another way, what exactly is being quantified?

Did Einstein "guess" the time-dilation equation? I can't find anything on the net, but it seems to me that Einstein would have had to "guess" the time dilation into existence. Furthermore, supposed "proofs" could be hoaxes.

goooooovy man http://www.youtube.com/watch?v=QxbutNmaL-s&NR=1 addendum: any body know any other soliton waves in nature that are this aeshetically impressive?

I have been trying to show that the Einstein ring radius R_e = 2[GMx(L-x)/(Lc^2)]^1/2 to no avail. can someone who knows this show me, or at least point out the direction. I have a strong hunch that i'll have to use the light bending formula for small angles
delta_phi = 4GM/(bc^2), and...

Homework Statement Use Sterling's approximation to show that the multiplicity of an Einstein solid, for any large values of N and q is approximately \Omega(N,q) = \frac{(\frac{q+N}{q})^q(\frac{q+N}{N})^N}{\sqrt{2\pi q(q+N)/N}}Homework Equations \Omega(N,q) = \frac{(N+q-1)!}{q!(N-1)!} \ln(x!)...

I Read That Einstein Began Searching For An Explanation Of Gravity In The Em Waves... I'm Not Aware That This Has Been Proven To Be Wrong. I Only See That Em Has Been Related To The Weak Force.. Can Gravity Be Only After Em Waves Exist Or Does Gravity Exist At And Within The Weak And Strong...

If General Relativity is background-independent, and, as Einstein himself said, general covariance "takes away from space and time the last remnant of physical objectivity," why do you think it was so hard for him to accept the possibility that quantum mechanics also could be non-local? Are...

Einstein Summation Convention / Lorentz "Boost" Homework Statement I'm struggling to understand the Einstein Summation Convention - it's the first time I've used it. Would someone be able to explain it in the following context? Lorentz transformations and rotations can be expressed in...

Homework Statement 2.Explain in your own words what Einstein means by “the principle of relativity”, and why it seems to be incompatible with the theory of electromagnetism (or “the law of propagation of light”). Homework Equations Not an equation but Einsteins answer can be seen here in...

How does Einstein’s theory of special Relativity explain the result of the Michelson-Morley experiment? Iv'e tried numerous times to do a google search but got no clear answers. if anyone could help it would be greatly appreciated. thankyou.

How does Einstein’s theory of special Relativity explain the result of the Michelson-Morley experiment? Thankyou if you can help

Are the phrases "Linearized gravity", "Linearized Einstein Field Equations", "GEM (gravitoelectrodynamics)", all referring to mathematically equivalent approximations of Einstein's full non-linear field equations? If not, could someone tell me what order (in some rough sense) these would be...

Homework Statement Is \partial ^ {\nu} F_{\mu \nu} + m^2 A_{\mu} the same expression as \partial _{\nu} F^{\mu \nu} + m^2 A^{\mu} ? What form of the metric do I need to hit them with to show that? Also is \partial ^{\nu} \partial_{\mu} A_{\nu} = \partial_{\mu} \partial ^{\nu} A_{\nu}...

Homework Statement I have E(v) = (m*c^2)/sqrt(1-v^2/c^2). I also have a second-order Taylor-polynomial around v = 0, T_2_E, which is mc^2+½mv^2. I have to use Taylors formula with restterm to show that E is bigger than T_2_E for all v in the interval [0,c). The Attempt at a Solution...

Hi all, In my last thread on phonons and aether, I was prompted to look up some stuff of modern aether. I will leave it up to you to interpret as i know little of this, but basically, there are a few guys out there there that firstly think Einstein and others are wrong with relativity etc...

I have E(v) = (mc^2)/(sqrt(1-(v^2/c^2)). I have found the second-order Taylor-polynomial for v=0, and I get: T_2_E(v) = mc^2 + ½mv^2. My teacher asks me, why this equation must be true - what is so special about the second order Taylor-polynomial for v = 0 for E(v)?

Can anyone tell me how far cosmology has advanced beyond Enstein?

Homework Statement I am a bit new to Einstein notation. Why is this true: \eta_{\mu \nu} \frac{d \delta x ^ {\mu}}{d \tau} \frac{d x ^ {\nu}}{d \tau} = \frac{d \delta x ^ {\mu}}{d \tau} \frac{d x _ {\nu}}{d \tau} How can you go from 16 terms on the LHS to just 4 terms on the RHS. If it is...

Hello, As with a lot of people, I have been excited and fascinated by the field equations Einstein described, revealing the curvature of spacetime. I would like to create a computer simulation which simulates the effects of the Einstein Field Equations, in other words, the curvature of...

Car 1 is traveling at 3/4c. Car 2 in behind Car 1 is traveling at 1/2c. Car2 fires a bullet that travels at 1/3 c. OK. In order to determine whether the bullet reaches Car 1 or not we need to use Einsteins velocity addition rule and determine whether the relative velocity of the bullet...

A few questions about BEC: A) When these bosons condensate, many particles fill the ground state. I read from textbooks that this would imply that they occupy the same position. -1- experiments are done with Rb atoms, which consist of protons, neutrons and electrons. Wouldn't the electrons...

http://arxiv.org/abs/0706.4400 Albert Einstein - a Pious Atheist V. Djokovic, P. Grujic 21 pages (Submitted on 29 Jun 2007) "We consider Einstein's attitude with regard to religion both from sociological and epistemological points of view. An attempt to put it into a wider...

if we consider the Group structure of [ \pi _{ij} , g_{ab}]= \delta _{ia,jb} of the Einstein equation for the momenta and metric, could we obtain its Casimir Operator, conserved quantities and so on?

what y'all think about that portuguese guy (joão magueijo) and his colleagues who have proposed that the speed of light has varied since the big bang (it has slowed down according to this new stream)...do you agree with this?

On this site http://www.geocities.com/physics_world/mass_paper.pdf It states that the 3 force can be written as... F = M1 x A1 + M2 x A2 Where 1 is the longitudinal component of acceleration and 2 is the transverse component of acceleration. It appears that if there is no...

Was Einstein Wrong? In Chapter 9, The Relativity of Simultaneity, of Einstein’s book Relativity (http://www.marxists.org/reference/archive/einstein/works/1910s/relative/index.htm), Einstein said: “Hence the observer will see the beam of light emitted from B earlier than he will see that...

The New York Review of Books got Lee Smolin to do a 10-page review of a handful of recent Einstein books. It's definitely stereoscopic (3D). with a sense of the complex personality. nice to see the oversimplified popular images countered http://www.nybooks.com/articles/20279 Mark Trodden of...

The Einstein cross (G2237+030) shows 4 reasonably symmetrically spaced images of the very distant quasar, indicating that our alignment with the galactic nucleus to quasar line is fairly good. How is that it does not show an Einstein ring instead of the cross?

Please help to find the answer of this question.

Can someone explain to me why this is the appropriate action?It makes some sens that that would be used, but I'd like a detailed explanation from someone familiar with the topic. Why is it the one that yields the proper equations?

Hey, Can anyone help me to understand einstein notation and permutations? I have a book, but it's not very clear. I really don't understand how you can write A_ij = e_ijk a_k out as a matrix? To start with I understand that a matrix can be represented as A_ij where i is the row and j is the...

Einstien was a brilliant scientist and he made great advances in our understanding of the world around us. His theories are works of beauty (what I understand of them anyway), but other than that, what really is the big deal? There are documentaries on his life. He had the kind of celebrity...

I do not understand Einstein's thought experiment explaining special relativity. If I understand it correctly, you have two people. One is on the center of a moving train, and the other is on the ground next to the tracks. As the one on the train and the observer pass each other, lightning...

Matt Visser - Lorentzian wormholes. From Einstein to Hawking (Springer) (1996) Just opened this book. Does anybody know it, and if you do, do you recommend it? Any feedback on this book.

Can someone explain to me what Einstein Hilbert action is? and how it relates to the variational principle? I appreciate any help that I can get!

Einstein views on gravitation,please. help! Hi all, If someone may explain in simplest manner the views of Einstein on gravitation?.Particularly I'm much confused about 'geodesics' & 'curved space time'.Thanks.

Has anyone evaluated the Einstein Field Equation purely in partial derivatives wrt x,y,z,t? What does it look like?

In Landau's bok "Classical Field Theory" pages: 372-373-374 they manage to get the Einstein-Hilbert action (after integrating by parts and use divergence theorem) \mathcal L = \int dx^{4} \sqrt (-g) g^{ik}(\Gamma^{m}_{il}\Gamma^{l}_{km}-\Gamma^{l}_{ik}\Gamma^{m}_{lm}) from this and...

The Einstein field equation relates the curvature of space to the distribution of matter, representing the latter with a tensor T. The components of this tensor have been interpreted as representing the volume-density of mass-energy together with the "pressure" in each spatial direction. Can...

Einstein was wrong, and should be Cartanized! (:D this is professional research) that's what I get from Derek's paper----classical 1915 Gen Rel is wrong because it uses a vintage 1850s manifold which has flat tangent spaces that don't roll. It should be moved over and put on a Cartan manifold...

Ref: http://en.wikipedia.org/wiki/Principle_of_locality" I don't have this article, so my first request is that if anyone has it and can either post it or (if concerned about copyright issues) you could email it to me, that would be appreciated. I may need it as a reference for a paper I'm...

Light on math, heavy on the man. Strangely, a search of these forums revealed no topics dedicated to this question. It would be swell to put yer thoughts in one place for me or anyone. What would you recommend? THANKS!

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: