Standard Definition and 1000 Threads

Maybe this is the wrong topic for this forum, but i am reading the following http://arxiv.org/abs/hep-ph/9703464 Which is on CPT violation and the standard model. I do not understand how they get to equation (9), when they write down the stress energy tensor as \Theta\mu\nu=1/2 i...

I missed the lesson on this and i can't figure out how to do this question with the data given. Homework Statement A class of 20 students takes a test. The score, x , for each student was recorded by the teacher. The results of summarised by: ∑(x-10) = 208 and ∑(x-10)² = 2716 i) calculate...

Okay, so I have an astronomy/astrophysics exam tomorrow and I understand everything except for the local standard of rest. Could someone please explain it to me? Thanks!

The standard potential of the Cl−(aq.)|AgCl(s)|Ag(s) electrode in the vicinity of T = 298 K has been found to fit the expression E\theta/V = -0.00558 + 2.6967x10^-3(T/K) - 8.2299x10^-6(T/K)^2 + 5.869x10^-9(T/K)^3 Find the standard Gibbs free energy, the standard enthalpy, and the standard...

I was asked this question by someone else and wondered if I could get better answers here: Is it fair to say that the standard model for matter is basically descriptive, without any underlying understanding of what causes its structure? Can it be compared it to the periodic table of...

Homework Statement i'm given the population mean and standard deviation. A new batch comes in and given a random sample. the question asks do i believe the new batch has a different mean from the overall average? Homework Equations The Attempt at a Solution so i got the mean and...

Hi, Can anyone point me to a reference for the statistical properties of the sample standard deviation of a sequence of identically distributed normal random variables subject to some form of serial correlation? Thanks, rhz

Problem Given a transformation T : P(t) -> (2t + 1)P(t) where P(t) ϵ P3 (a) Show that transformation is linear. (b) Find the image of P(t) = 2 t^2 - 3 t^3 (c) Find the matrix of T relative to the standard basis ε = {1, t, t^2, t^3} (d) Find the matrix of T relative to the basis β1 = {1...

when electrons are in their standard orbits , why is it that they don't absorb or radiate energy ??

It's a bit premature to conclude the LHC won't find Higgs or SUSY but... There are a few ideas kicking around that use knots (braids, strings, strands, knotted dimesnsions or whatever) to "explain" the Standard Model. One that catches the eye for its explicit particle mass calculations is...

Homework Statement let p1 and p2 be planes in R3, with respective equations: x+5y-z=20 and 2x+5y+2z=20 These planes are not parallel. Find the standard equation for the plane that is orthogonal to both of these planes and contains the origin. The Attempt at a Solution I have only managed to...

Homework Statement Two types of coins are produced at a factory: a fair coin and a biased one that comes up heads 55 percent of the time. We have one of these coins but do not know whether it is a fair coin or a biased one. In order to ascertain which type of coin we have, we shall...

I know the Higgs has been causing some issues. Could we have a list of the problems/issues with the standard model, aside from the recent unverified neutrino issue. For instance, does anyone know where the spin of the proton comes from? Thanks

Hello All, I am trying to figure out how to find the standard deviation or error in sets of data. So let's say I have sets x1, x2, x3 and x4 with various values and I found the average and standard deviations for it. Now I have to take the averages, let's say a1, a2, a3, a4, and normalize...

Homework Statement The concentration of cadmium in seawater can be determind spectrophotometrically. To six 50.0mL seawater samples, various volumes of a 10.0ppm cadmium solution were added and all were taken through the analytical procedure with the following results: Amount Cd Added...

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Hi, I'm using SML and I'm trying to make a program/function that finds all the prime numbers in an Int list of numbers. what I'm trying to do is make a function that removes any (and all) elements x of the int list where x mod p = 0, and where p is the first prime number (2). then i want to...

Homework Statement [PLAIN]http://img191.imageshack.us/img191/7440/unledtev.png The Attempt at a Solution There are like 2 other problems in my book similar to this one. I thought problems posed in this manner are already in standard form. They say "max [obj f] s.t...

Hi Say I have a linear problem Mp = d, where d is our data, p our parameters and M our "observation matrix" (see http://en.wikipedia.org/wiki/Inverse_problem#Linear_inverse_problems). So what we are dealing with is an overdetermined problem. Now, I have read an example where we have a...

Vitamin E (alpha-d-tocopherol) has been shown to prevent creeping arterial occlusion*, increasing cerebral circulation and decreasing the risk of ischemic strokes at a minimum effective dose of 100IU/day**. As a blood thinner (anti-coagulant) it has been shown to increase the risk of hemorrhagic...

I curious if anyone out there knows what structural design standards are used when mounting components onto small Naval and Marine (Zodiac) style watercraft. I can find all kinds of loads and vibration criteria for large ships like Mil-std-810 and Mil-std-167 but all of them specify not to use...

Not sure if this is where this question belongs because the course I am doing is predominately calculus based (Applied Physics, University level) but we have a small statistics component for obvious reasons. Any who, sorry if it's in the wrong spot. Homework Statement Intravenous fluid bags...

Hi If I have measured the resonance frequency of three sets of resonators and calculated the mean, variance and standard deviation for each set. How do I add the three variances and standard deviations to get an overall variance and standard deviation? Well, I know that the standard...

I am working with some wind speed data and need to work out the standard deviation of the magnitude of the horizontal wind. Unfortunately the only information I have is the standard deviation for the streamwise and cross-stream components of the wind (which are orthogonal). Is it possible to...

I'm confused about a premise implicit in the standard QM model of entanglement, which seems logically inconsistent. I understand that entanglement arises when two or more particles interact in some way to become synchronized in their quantum states, which also must be indeterminate in terms...

Something has bothered me for a long time about our model of light: that it has no mass. Just for a moment, forget what you know about light and let's call it the unknown, X, and suppose we want to model it. Here's what we know for certain: X has momentum, as seen by radiation pressure X...

Homework Statement Suppose that the systolic blood pressure of 20 year old females is normally distributed with mean 120 and standard deviation 15. a.) What proportion of 20 year old females will have readings between 115 and 125? b.) If you selected a sample of 64 people from this...

Homework Statement Write a C++ program that accepts 10 floating-point values from a user and determines and displays the average and the standard deviation. All values more than four standard deviations away from the average should be dropped and then the new average and standard deviation...

(solved) Calculate the standard deviation (statistics) Homework Statement From this table of values, I'm supposed to calculate the standard deviance Homework Equations Up until this point, I've had no problem calculating the standard deviance with my calculator by going to STAT>...

Homework Statement evaluate \inte^(\frac{\kappa*x^2}{2KT})dx with limits of integration from -infinity to +infinity using the standard form \inte^(-C*x2)dx = (\frac{\pi}{4C})1/2 with limits of integration from 0 to +infinity. Note κ, k, and T are constants. In the standard form c indicates a...

Homework Statement Evaluate the integral; \frac{2}{L}\intsin2(\frac{\pi*x}{L})dx from \frac{2a}{3} to \frac{a}{3}. Where L is a constant, using the standard form \intsin2(ax)dx=\frac{x}{2}-\frac{1}{4a}sin(2ax)+C, where a and C are constants. The Attempt at a Solution Ok, so I am...

The lambda-CDM model predicts a nearly flat spatial curvature at scales larger than the the scale of homogeneity of the universe. The calculation of many of its parameters depend on the cosmic distance ladder which in turn depend on many observational techniques and statistical comparisons...

So I have a situation that I keep confusing myself with: I am running a computer simulation that, after a set number of iterations (a block) will output the running average (mean) of a property and the standard error based on the previous blocks. So, as the simulation runs, these standard...

Homework Statement Prove the equation(s) for the asymptotes of a standard hyperbola. That is, prove that the asymptotes for the hyperbola x^2/a^2 - y^2/b^2 = 1 are y = -(b/a)x and y = (b/a)x where foci are at (c,0) and (-c,0); vertices are at (a,0) and (-a,0); difference in distances...

The current state of NASA’s version of cosmology is amazing to watch – According to modern cosmology, which NASA endorses, the Milky Way is moving through space at 600km/s and the Earth is moving through space at 30km/s and the sun is moving through space at 250km/s. So if we total up these...

I know 75ohm CATV coax is anything but ideal for 2.4GHz, but I am still curious as to how far these signals will travel upstream through the existing local cable network (splitters, etc) laid by the cable company, and if they could be transmitted between adjacent houses on a street. Example: an...

Some Questions on Lagrange Points – According to Wicki, a Lagrange point is The Lagrangian points are the five positions in an orbital configuration where a small object affected only by gravity can theoretically be stationary relative to two larger objects (such as a satellite with respect...

Hi, I hate the fact that my first post in forum is all about wanting not giving, but I'm only at 1st year mechanical so I don't think there'e much to give :DI was wondering about E399 in the ASTM standard, according to this video (last minute): http://www.youtube.com/watch?v=WlFs2unBvdU We...

I'm a layman trying to understand the symmetries used in the std model. I understand that U(1), SU(2), & SU(3) are incorporated in the Lagrangians for internal symmetries. I've read that SO(3) is also used in the std model for Poincare spacetime symmetry. Is that true and if so, how is it...

Homework Statement x^2+4y^2-8y-6x+9 convert this equation to the standard form of an ellipse and identify the foci, the middle point, Homework Equations x^2/b^2+y^2/b^2 The Attempt at a Solution Ellipse-----> My standard form of this ellipse ((x-3)^2/(2)^2)+((y-2)^2/(1^2))-4 I...

Homework Statement Find the standard matrix for the linear transformation T: R^3-->R^3 satisfying: T([1 2 2]) = [1 0 -1], T([-1 -4 -5]) = [0 1 1], T([1 5 7]) = [0 2 0] All of the vectors are columns not rows, I couldn't type them correctly as columns. The Attempt at a Solution I...

What is the consensus here about Information Theory beyond the Standard model? The three fundamental theories of the universe, relativity, quantum mechanics, and the second law of thermodynamics all involve limitations on the transfer, accessibility, quantity, or usefulness of information...

A quick question from a non-physicist and non-mathematician. Do the equations of the Standard Model (without the Higgs Mechanism and any other speculative theories) presuppose that all the particles have zero mass and zero dimensions i.e. are they purely "mathematical" points?

Homework Statement θ is an angle in standard position with domain 0° <θ< 360° and cot θ = . Find all possible values of θ Homework Equations ? The Attempt at a Solution ?

I remember many years ago, as a little kid, I used to watch a hell lot of National Geographic and Animal Planet. Those were some excellent documentaries and watching them was what got me interested in science and especially life sciences. But for the past few years I have been observing a steady...

Consider the Uniform distribution (continuous) U(-1,1) which has p.d.f. f(x) = 1/2 for -1 < x < 1 and 0 otherwise. I have calculated the Fourier transform using the characteristic function and got fhat(epsilon)= sin(epsilon)/epsilon How do I calculate the standard deviation of this...

Homework Statement The average monthly expense of a certain family during 11 months is 4000 shekels, with a standard deviation of 100 shekels. Afterwards they added to the calculations the family's expense at the 12th month, and they found the average remained unchanged. A) What was...

Homework Statement The grades distribution in class is 10, 8, 8, 7, 7, 7, 6, 6, 4 What's the standard deviation? The Attempt at a Solution I found the average is 7 (which is true) and used the formula for standard deviation. I checked it twice on the calculator but I'm still...

I was reading Baez's FAQ at http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html#17" and I came across this nugget Except for gravity, all physical phenomena are observed to comply with the "Standard Model" of particle physics. The Standard Model is a relativistic quantum...

I have a question about Garrity's formula at the top of p. 125, here, for a function from the set of 2-form fields to the set of tangent vector fields, together with the formula on p. 123 for the exterior derivative of a 1-form field and Theorem 6.3.1 on p. 125 (Garrity: All the Mathematics you...