Creation Definition and 310 Threads

Greetings, I see the same questions asked repeatedly (including by myself). It would be great if once a question is answered, it be added to a FAQ. A FAQ for each forum category. Such questions include: 1) Does an object A moving relative to an object B exert a stronger gravitational...

speaking of sythetic elements does anyone know how yttrium-103 was created if you do that would be a big help

I know people get tired of answering questions about photons, but I have a question regarding the best way to think of how light (i.e. E-M waves) are created. Several books and educational resources say that a light wave is created by "vibrating electrical charges." But my understanding of...

Hello, I have a conundrum I cannot fathom a reasonable explanation to. Suppose I were in a moving vessel at the speed of light (yes, I said it). If I were to get up and try to walk forward, I would have my velocity reduced since I cannot exceed the speed of light. Can I postulate then, by...

Hello, does anybody know how to compare (at tree level) the two reactions e^- + e^+ \to \gamma^\ast \to e^- + e^+ and e^- + e^+ \to Z^\ast \to \nu + \bar{\nu} \;\;\; \text{and} \;\;\; e^- + e^+ \to W^\ast \to \nu_e + \bar{\nu}_e The first process is the so-called Bhabha...

Moved from locked thread. Stany asked: 1: That was about creating mini black holes, not worm holes. 2: Although the maths was not provably impossible, it is not yet clear whether mini-black holes can be created in practice except by evaporation from not-so-mini BHs which is a SLOOOOOW...

http://books.simonandschuster.com/Tear-at-the-Edge-of-Creation/Marcelo-Gleiser/9781439108321 Overturning more than twenty-five centuries of scientific thought, award-winning physicist Marcelo Gleiser argues that this quest for a Theory of Everything is fundamentally misguided, and he explains...

Hi, I'm working on a project that uses a mass air flow sensor. It outputs a signal in hertz which relates to grams per second. I am trying to create a formula that I can use to easily convert the Hz to G/s. I have only been able to get a few samples of information to assist in the...

Homework Statement One likely theory for the origin of the Moon is that it was formed by the impact of a Mars-sized object on the young Earth. How fast would the object have to be going when it hit the Earth to vaporize enough rock to make the Moon? Homework Equations The Attempt...

Suppose a problem requires me to find the result of [(a+a#)^n ]ln> , where a is the annhilation operator , and a# is the creation operator , now n can be any number , suppose if it is 10 then will i write (a+a#) 10 times and then multiply each of these terms to see which are non zero , isn't...

First of all, if anything in this post is incorrect I'm sorry. My physics is still developing and I hope to learn a lot here! So, E=MC^2 states that mass can be converted directly into energy, and a he'll of a lot of it, correct? However, energy cannot be created or destroyed, only...

Hey folks, I think this is the best section to ask this question. I've been thinking about the mining of He-3 on either the moon or the gas giants and the associated exorbitant costs, usually measured in the tens to hundreds of billions of dollars. I've also been trying to think of ways...

I found in one book that the energy required for creation of one photoelectron in silicon is 1.14eV (that's the energy gap between vallence and conduction band). So only photons with energy higher than 1.14eV can create one free electron. It's understandable for me. But when the energy is...

it is known that there is considerable lag time when light travels from some place and reached us her on earth. is it possible that what we consider to be star formation actually nothing more than us receiving their light for the first time? thanks in advance.

What is exactly the creation and annihilation operator in quantum mechanics? What its physical significance?

Is it possible to make one of these at home using an everyday glass bottle? If so could anyone tell me how? Thanks

Hi, I'm new to this forum and I thought I'd ask for some help with my research paper. Well I am a Senior in Highschool and I take IB (International Baccalaureate [Google it]) courses which are basically super advanced courses. Anyway, one of the requirements is that I write a 3,500-4,000 word...

What is the analog of particle creation and vacuum energy in the Bohmian approach? Has Bohmian QFT been developed to a point where it can provide a satisfactory explanation of this phenomenon within it's framework?

So the Hamiltonian of the wave-function of the universe is equivalent to zero. Am I correct in interpreting this as a statement that, if taken together, all the energies of the universe, in some sense, would "sum to zero"? If energy cannot be created, nor destroyed, then the fact that they "sum...

Hello all, I am using C++ 2008 Express edition to create a .dll file for use in C# and I am receiving the following error from my compilier. "regsvr32.exe cannot be found" I have all of the properities set correctly for the .dll creation and the .def file is specified correctly. Does...

Why cannot virtual particles in the vacuum be directly detected? Experiments have shown the Casimir Effect that supports the idea of virtual particles does exist. But can we also detect the presence of virtual particles directly in the vacuum? The most common virtual particle to form is photon...

If our sun will took around 15 billion years to convert hydrogen (Atomic#1) in helium (Atomic#2) how much time it took, since big bang, to generate heavy atoms like all we have on Earth as iron, uranium, plutonium and etc ?

Hi Suppose \Lambda is a Lorentz transformation with the associated Hilbert space unitary operator denoted by U(\Lambda). We have U(\Lambda)|p\rangle = |\Lambda p\rangle and |p\rangle = \sqrt{2E_{p}}a_{p}^{\dagger}|0\rangle Equivalently, U(\Lambda)|p\rangle =...

Hi, Does anyone know how to create the following symbol (in LaTeX): An exclamation mark directly above an equal sign. Thanks!

Hello all! I have a question about the way or ways in which C-14 can be created: From the background research I have done, I see that high energy neutrons colliding with nitrogen atoms give rise to C-14. I also looked a little bit into beta+ decay. I was curious as to whether or not...

This is my first post here and I am strictly seeking info, guidance, assistance... I have read many posts here and see many intellegent people. If you have any beneficial info I would appreciate it. I have theories... Before the Big Bang, existence in its entirity would have been dark...

I am participating in an atheist/theist forum and don't have a physics background. An idea is - everything we are aware of is within the cosmos - hence logic, or any process susceptible to logic, also only exists within the cosmos - ergo the universe was probably created by means we would...

I understand that it is said that the universe is expanding and all that but where did all the matter come from that exists, did it all come from a single point particle or is there another theory for this. It seems like one of those questions that it is still under investigation heavily by...

out of curiosity is there any theory on how dimensions that we exist in were created? or are they always said to have existed.

Broadly speaking, any new theory, (plate tectonics, origin of species etc.), on an established subject, will be greeted with howls of opposition, but with the course of time and ever more supporting evidence, the theory will gain favour, as it was with the big bang. The principal evidence was...

For creation operator of hamonic oscillator, we have a^\dagger |n> = \sqrt{n+1}|n+1> if I consider the creation operator operate on the bar vector, should I also get the same thing? namely <n|a^\dagger = \sqrt{n+1}<n+1|

Poor title. Actually I have a whole bunch of wave function questions. I don’t know the boundaries of this concept. Assuming a correct wave function, can a particle have more than one? Can 2 observers each have their own wave function? The moment a particle encounters another particle, does one...

Hello, Im trying to find out if, since an electron positron pair can anhillate to produce a muon-anti muon pair by the weak interaction, can the same thing occur for the production of an electron/anti-electron pair? Or would it just happen by the electromagnetic force? Or both, with the weak...

an electron-positron pair, each with a kinetic energy of 220 Kev, is produced by a photon. find the energy and wavelength of the photon. started with E=hf=pc , and the fact that p=mv, but his not working

Hi, I'm familiar with tree traversal alogirthms, post,pre and in-order. If you give me a tree I can print out the specified traversal of that tree. However, one thing I can't do is build a tree from a given output. For example, on my last test, my prof gave me this Question: A pre-order of a...

All the theories of the universe’s origins that I have read discuss expanding matter and energy. As far as I know, it is assumed that this expansion created space. I have also read that the universe is continuing to expand, however, at a much less energetic pace. I am wondering if anyone has...

lets simulate this simple experiment: creation followed by annihilation of 2 equal particles of type P, here named P1 and P2. (*) assuming the precursors before creation as usual, and also residuals as usual after annihilation. The question is about the remaining fields, gravitational...

Based on theories of an accelerating universe, how can the creation and annihilation of pairs of particles/anti-particles (virtual particles) generate energy in a vacuum (space) thus contribute to Eintstein's theory of a cosmological constant (positive pressure). And if the quantum...

Homework Statement The problem is to find the eigenkets for the creation operator ,a^{\dagger} if they exist Homework Equations a^{\dagger}|\Psi>=\lambda|\Psi> a^{\dagger}=\frac{1}{\sqrt{2*\hbar*m*\omega}}*(-\hbar*\frac{d}{dx}+m*\omega*x) The Attempt at a Solution I use the...

OK, I've almost finished the hardware for my micro-aquarium. See diagram P=pump, H=heater, L=light (20W halogen), F=fan(CPU cooler) The 12V system is my last tweak. The basis of it is one of those 3x20W puck light sets from IKEA. I've ditched two of the lights and wired up the fan...

Hello, I have the missfortune of having to calculate a commutator with some powers of the creation and the annihilation operators, something like: \left[ a^m , (a^{\dagger})^n \right] I have managed to derive \left[ a^m , (a^{\dagger})^n \right]= m a^{m-1} \left[ a , a^{\dagger}...

A little background first is that I'm currently a rising Sophomore at Winthrop University in South Carolina. I am a Computer Science and Mathematics Double Major. After finishing half-way through third semester calculus and dealing with 3-Dimensional space, vectors, planes, and surfaces, I...

On March 19th at 2:20AM** http://www.badastronomy.com/bablog/2008/03/20/naked-eye-visible-grb/". In the few seconds this object flared, it put out a million, million, million times more energy than the Sun will in its entire 10 billion year lifetime. This occurred very, very far away, but it...

Is cosmology an attempt of the church to highjack science? Is this cosmology the beginning of a new breed of "science" where belief is protected and taught under the name of science?

Could you please show me some standard websites about the creation of our solar system? Thanks

Some of my friends claim that the solar creation had something to do with a supernova. I have no idea about that. Can you please explain? Thanks

control creation time of light "particles" Ok, I got this program called FileDate, which allows me to change the creation date and time of a file. Then, a question struck me: What if you were able to control the creation time of light "particles", or light photons? Don't ask me why I'm trying...

I'm a little bit confused in general about what an eigenstate is. So say we have something like: H|n>=hw(N+1/2)|n> |n> is the eigenket, hw(N+1/2) is the eigenvalue, but what exactly is an eigenstate? The entire question asks if there are eigenstate to the creation operator and to prove it...

Homework Statement Show that the creation of an electron-positron pair (or any particle-antiparticle pair, for that matter) by a single photon is not possible in isolation, ie, that additional mass (or radiation) must be present. (Hint: Consider the reaction at threshold, then apply...

I have a question regarding anti-matter in which ways can it be created? I got into a heated argument with someone last night. He's a first year university student and he was trying to tell me that we can create it by accelerating particles to the speed of light and making them collide. I know...