Paper Definition and 999 Threads

With laser pointers being so ubiquitous, everyone is familiar with the sight of interference patterns on paper, ground glass and other surfaces (not to mention more subtle experiments like this one): Quantum Eraser -- which has been discussed recently in other threads. We take it for granted...

I have been using this paper to study the properties of the Godel metric: http://www.math.nyu.edu/~momin/stuff/grpaper.pdf I have some questions that start from Theorem 3.1 and go from there. 1. On page 5, it says that Gμν = Rμν - ½ gμνR = 8πGρuμuν + gμνΛ (note: Λ is supposed to be the...

http://iopscience.iop.org/0004-637X/804/2/79/pdf/0004-637X_804_2_79.pdf The report finds evidence for a halo of ionized gas and small amounts of other heavier elements, in a very large halo around the Andromeda galaxy. The report estimates the mass of the CGM halo's metal component at 2 million...

I was hitting against a wall for the last hours. I am not able to obtain the 1/2 terms in the eq. 5 of this paper and left all in terms of only ##N_i## and ##\overline{N_i}##,neither. Anyone could give me a tip? http://arxiv.org/pdf/hep-ph/0210271v2.pdf Thank you in advance.

Daniel.Y.Gezari @ nasa.gov 's paper arxiv.org/vc/arxiv/papers/0912/0912.3934v1.pdf lunar ranging evidence of variable c fig 2 of this paper shows DLB as the distance between the observatory (Launch) and the retro-reflector at the moment of the Bounce, DBR as the distance between...

I am going to hold a lecture on aerodynamics for a group of high school students, after which a competition on constructing the best glider is held. I think the planes will be made of sheets of balsa wood, and they are therefore likely to have flat wings. To help them succeed, I plan on telling...

My question is a bit chemically, but... What's the atoms, what's makes the paper? How many paper i get from 1 mol of atoms, what contains the paper? How many grams, or pieces of A/4 size papers?

[this thread was forked from another thread, as it is an interesting topic in its own right] Yes, a variant of Bell's theorem says that quantum mechanics is truly random as long as we cannot signal faster than light. http://arxiv.org/abs/quant-ph/0508016 http://arxiv.org/abs/0911.2504

I'm not sure where to post this but it is technically homework but it doesn't follow the template and its less of a math question and more of a conceptual thing anyways. I have to write an English paper on a problem in a future career and it has to be big. I'm thinking about physics so I wanted...

I'm doing a paper on the strong nuclear force for a nuclear physics class. I want to give a good quantitative account for it. I'm very familiar with Lagrangian field theory but not so much with QFT or QCD. I don't have time to learn all of the ins and outs of QFT and for this paper and for this...

Hi. First off, sorry if this is the wrong forum; this seems to be the most valid one, but if that's not the case please let me know. Anyway, I am writing a thesis, and in it I mention the Michel electron (electron created from muon decay) and note that it gets its name from Louis Michel. I was...

Indicate the papers you think will prove most significant for future Loop-and-allied QG research. The poll is multiple choice, so it's possible to vote for several. Abstracts follow in the next post. With one exception, the papers are listed chronologically: latest first. The exception was a...

Since https://www.physicsforums.com/threads/wait-for-it-wait-for-it.746296/ is closed, let me open a new thread about a paper which appeared today: http://lanl.arxiv.org/abs/1503.09045 :biggrin: (By the way, this is my 5.000th post.)

One million digits of pi, printed out on a mile long piece of paper. What do you think?

What type of "graph paper" do I need to graph an arbitrary solution, Ψ, of the Dirac equation in 3+1 dimensional spacetime? Assume the "graph paper" has the minimum dimensions required to do the job. Would this work? At each point of spacetime we need a complex plane which takes care of the...

Wonder if our resident researchers and scientists feel this way? http://arxiv.org/pdf/1503.01881v1.pdf

Problem 2.14: Explaining the Simplification from Street-Fighting Mathematics by Mahajan "Why is the drag force independent of the gravitational acceleration g and of the cone's mass m (yet the force depends on the cone's shape and size)?"Context Imagine two paper cones formed by taping together...

Hi Guys Quantum Darwinism came up in another thread so I thought I would go through Zurecks paper on it. http://arxiv.org/pdf/0903.5082v1.pdf Went through it years ago but know quite a bit more about the foundations of QM now. What struck me this time was his postulates: 'Quantum physics...

How would you do this equation on paper 1/2 x 26 x 10

Homework Statement (This isn't a typical problem here so feel free to suggest an alternative forum category or website.) I'm trying to do research for a paper about nuclear waste and depleted uranium storage by the DOD. I have a lot of questions I need to answer before I can get too far into...

Does anyone use graphing paper for Physics, as well as Math classwork? I like graphing paper, but the kind I use (5x5 from Walmart) doesn't seem to be working out very well. I am having a difficult time reading what I am writing on the paper. I like using graphing paper because it allows me...

Open access at CQG.

Homework Statement [/B] A circle of radius ##a##, with diameter ##AB##, is drawn on a sheet of paper which lies on a smooth horizontal table. The paper is pivoted with a pin at ##A## and has moment of inertia ##4ma^2## about a vertical axis through ##A##. An insect of mass ##m## walks around...

Hi, this experiment has been doing it's rounds in the media this week. I've read the popular explanations and the preprint but as a layman I'm not sure I quite get what they've done. Especially I don't get how the spatial distribution of a photon affects its propagation speed. Or in what sense...

So I noticed a mistake in the mathematical analysis in a paper and I want to propose the revised version. What should I do? I think it doesn't worth a journal since the revision probably only takes a page. Is there other ways of doing such revision? I have heard there is this short...

Can I write a scientific paper with just the ideas? Without any mathematical proof. I plan on writing about the origin of the universe.

Meibom, Søren; Barnes, Sydney A.; Platais, Imants; Gilliland, Ronald L.; Latham, David W.; Mathieu, Robert D. (5 January 2015). "A spin-down clock for cool stars from observations of a 2.5-billion-year-old cluster". Nature. doi:http://dx.doi.org/10.1038%2Fnature14118 . The rotational velocity...

I just came across this paper arguing that the electron neutrino may have negative mass squared: http://arxiv.org/abs/1408.2804 It says it has been accepted for publication. I'm wondering if anyone has seen it and can comment on the paper's arguments.

Hey guys here I found a hand-written paper. It is very funny to see it. http://people.maths.ox.ac.uk/lmason/Tn/26/TN26-02.pdf Could this be of any importance for current physics?

Since yesterday, Einstein's collected papers are freely available for viewing on the Princeton University website: http://einsteinpapers.press.princeton.edu/ http://blog.press.princeton.edu/2014/12/05/princeton-university-press-launches-the-digital-einstein-papers/...

http://arxiv.org/pdf/1412.0805.pdf Auto-Concealment of Supersymmetry in Extra Dimensions Savas Dimopoulos,a Kiel Howe,a,b John March-Russell,c,a James Scovillec,d aStanford Institute for Theoretical Physics, Department of Physics, Stanford University, Stanford, CA 94305, USA bSLAC National...

Hi, I've decided to try to write and publish a paper by the end of my undergraduate degree. I'm planning to get advice from professors at my institution at a later stage in the process - I'd like to approach them when I've narrowed my topic some more and made the focus clearer, and when I've...

Hello, I just recently came across this paper and I've been since reading everything I can find about Van Flandern's "credibility" and the controversies his proposals brought up. Still I'm yet unable to find a source to verify or disprove this assertion Van Flandern makes in his paper: "How...

I'm looking for sites with historical journal articles -- ideally in English, but if there's none available, I can settle for the original. Specifically, I'm looking for stuff by (in no particular order, and certainly not exclusively) e.g. Heisenberg, Pauli, Dirac, Schrodinger, Feynman...

I'm a first year physics undergraduate. I'm trying to look for some research opportunities as becoming a physicist is always my target. However, I simply have no idea how the current research is going on, and before I approach any professors I guess I should already have some basic understanding...

I've been researching on Damped Oscillation (in vibrations) for a few days for a research paper, however I couldn't find any applications. I would be very thankful if anyone can tell me about its applications.

I recently submitted a paper to a respectable journal. After submission, I discovered a few errors in my paper, one of which is quite serious. I have the corrected expressions and plots and I've checked that they are in agreement with the overall theory (as presented in other papers). My...

This is the second half of the poll. Of the ten candidates in Part II, please indicate the ones you think will prove most significant for future Loop-and-allied QG research. The poll is multiple choice, and it's possible to vote for several papers. Abstracts follow in the next post. Here's a...

There are twenty candidates, and the poll is divided into Parts I and II, each with ten. The poll is multiple choice so it's possible to vote for several papers. Please indicate the ones you think will prove most significant for future Loop-and-allied QG research. Abstracts follow in the next...

People interested in quantum gravity research may wish to take note of Dittrich's September 2014 paper which I believe represents a significant step towards constructing the continuum limit and the physical Hilbert space of LQG. It will be on the third quarter MIP poll. I'll get the link...

I am writing a lab report as part of my degree and, of course, it must be in the standard scientific paper format. I have come up against something that isn't particularly difficult but something that you must get correct for papers. I am defining quantities and their units, however I am not...

So, I want to write a paper for this year's science fair. I wanted to ask, if anyone could give me a few suggestions on some cool topics? It doesn't necessarily have to be Chemistry, it could be Physics, Mathematics, Bio, etc. If anyone has some ideas about Food Chemistry, that'd be cool too...

Hi, I am looking for below paper. Already contact both writers but got no reply. Anyone who have this or can access this journal, can you please send it to me. Winton, S., and Rappaport, C. ``Implementation of a Two Dimensional Plane Wave FDTD Using One Dimensional FDTD on the Lattice Edges,''...

http://www.mit.edu/~klund/papers/jmiller.pdf The Miller Effect has always intrigued me. This ancient paper analyzing the phenomenon shows some incredibly lucid analytic methods...something I think is missing from a lot of modern electrical engineers. I'd like to have some discussion on this...

I thought others might be interested in an old educational paper and fim demonstrating that you can't accelerate material objects past c. Bertozzi, Speed and kinetic energy of relativistic electrons, Am. J. Phys. 32 (1964) 551 The Ultimate Speed - An Exploration with High Energy Electrons -...

Hi PF community! I'm currently doing a research paper on artificial satellites, and I've made a list of things that I'm going to explain in it, but I'm worried that it won't be enough. So, I was wondering if you guys could help me to add more topics to my list and how to approach more widely to...

Hi Forum, I am trying to follow the math in Bell's original paper, and I am getting tripped up on equation (14). Does anyone know the mathematic legerdemain Bell used to go from the first equation below to the 2nd? \begin{align}...

This week I received a criticism of a short letter of mine, along the line of "the starting point is not well justified, and the rest of the paper are just calculations". It is not the first time that I get a critique in this format; in the first paper I got rejected, the referee asked "where...

Not sure if I posted this in the correct area, but hopefully it will be moved if I haven't done so. I'm here asking you guys if you know any books relevant to writing a paper on the subject of "The Development of Newton's mechanistic Universe - Principia (1687)." It's for a history class, so...

I am writing a paper on the collision of two galaxies. I would like advice on using the right method to complete this project. I have found some sites about the collision of the galaxies: http://www.sciencedaily.com/releases/2014/08/140826141130.htm http://arxiv.org/pdf/1406.4859.pdf...