# Nikolaj K.

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A duck walks into a bar. Animal control is promptly called and the duck is released into a near by park.

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 1d comment How rigorous can conservation of energy be made? In physics you try what has worked before until it doesn't. Conservation of energy is a showpiece of the cookbook, hard to get rid of. And people like it, it's tasty. I also asked a related question, and see the related links posted by Cmechanic. Mar13 revised Do batteries lose charge? nooooooooo Mar13 suggested suggested edit on Do batteries lose charge? Mar13 revised Why do noble gases stabilize plasma discharges? added 19 characters in body Mar13 answered Why do noble gases stabilize plasma discharges? Mar12 comment Can Somebody give me Questions You misinterpreted the Q&A concept. Mar10 comment Why quantising gravity necessarily give us gravitons? Do you know if there is any hypotetical way of tweaking the spin degrees of freedom and make the graviton a fermion? Are there physical arguments against that? Mar9 revised Tensor product of Hadamard Operators suggestion to make it parsable Mar9 suggested suggested edit on Tensor product of Hadamard Operators Mar8 revised What is an effective and efficient way to read research papers? added 134 characters in body Mar8 answered What is an effective and efficient way to read research papers? Mar7 comment How to find different operator representations in QM? @DepeHb: i.imgur.com/IchgG0c.png Momentum is that which is conserved if you translate the system. Turns out the operator $T_d$ which shifts a function $f(x)$ by $d$ can be written as $\exp\left(i\hbar\,d\,\left(\frac{1}{i\hbar}\frac{\partial}{\partial x}\right)\right)$. The generator is the momentum operator $\propto\frac{\partial}{\partial x}$ and so as function of $x$, the eigenstates $\left|p\right\rangle$ of that operator must be $\mathrm{e}^{cpx}$. Mar7 revised Naive visualization of space-time curvature added 5 characters in body Mar7 comment Naive visualization of space-time curvature @StanLiou: Then you are assuming you can explain the notion of a local interial frame to a layman. Mar7 answered Naive visualization of space-time curvature Mar5 answered Do Dirac Gamma Matrices act like Tensors? Mar5 comment Is there a limit to acceleration? @Carterini: Not that a factor of 2 is of any relevance if we're already speaking of $10^{51}$, but no, $2.2$ is the value you get if you plug in "(speed of light)^(7/2)/((Plancks constant)*(Gravitational constant))^(1/2)" into wolframapha and so here I bet against your back of the envelope calculuation. And I say it again, I'd just sit down and see how fast momentum can translate between two particles, say with a $\left|r_1(t)-r_2(t)\right|^{-2}$. Mar4 comment Is there a limit to acceleration? Afaik, there is no slogan about maximal acceleration. You could cook up a Planckian acceleration $c^{3.5}/(\hbar G)^{0.5}\approx 2.2\,10^{51}m^2/s$, but I don't see the use for that here. Seems the latter must ask for r'' vs. W. We should maybe make it a little more concrete. Consider a particle at rest with $r_1=0$ at some time and set up a potential $V(|r_1-r_2|)$ with another particle. You can consider a) a free collision (where total momentum is constant) and compute $r_1''(t)$. b) try to compute the energy cost it takes to move the second particle in some way to push the other one. Feb27 revised Group of translations in two dimensions - A weird treatment check it out Feb27 suggested suggested edit on Group of translations in two dimensions - A weird treatment