Creation Definition and 302 Threads

How did they experimentally verify that there is pair creation and annihilation in the vacuum? What kind of particles usually pops in and out of the vacuum?

Mmmmm... why only steam is used in a steam ejector for creating vacuum and not anything like air or other inert gases...:confused:

Hi again, I was doing some experiments on heat of combustion of various fuels and determine which fuel is better by creating a calorimeter. And its simple and straight forward but i started thinking what happens to the water created by burning the fuel, as an example i was doing methanol and...

Does QM tell us that photons are actually electrons and positrons goign through a cycle of annilation and creation?

Hi! A question from a beginner in quantum physics... If the quantum field randomly produces an electron-positron pair, and the pair annhialate, a gamma ray photon is produced. The net result of this process is gamma ray photons coming out of the quantum field at random. This means the...

Hi! My exams are coming up soon and I'm revising some of the notions of electromagnetism. What intrigues me is the way electric field is created/distributed within a wire. I've been thinking about it for some time and have come up with the following "hypothesis", idea: When a conducting wire...

Homework Statement The aim in a particle scattering event is to let an electron and a positron collide and annihilate each other to form a Z-particle. The (rest) masses of these particles are given by: m_e- c^2 = m_e+ c^2 = 0.511 MeV m_Z c^2 = 91.187GeV There are two ways the experiment...

Dirac's theory of the electron predicted that there were identical particles of equal mass but of negative energy. He appealed to the Pauli exclusion principle and proposed that there was a negative energy 'sea' of electrons that was full up to -2mc^2 in order to answer critics that positive...

Hey, I am calculating the expectation value of the position x. I have the wave function psi(x) = |1> + |2> so I use the equation <x> = <psi|(a+a^+|psi> to calculate the mean value. So I get (<1| + <2|)(a+a^+)(|1> + |2>) which I reduce to <1|a|1> + <1|a|2> + <2|a|1> +...

Ok so I mixed alum (aluminium potassium sulfate... I think), flower,and cornstarch in a 1:1:1 ratio, and put that in a covered pot and heated it till it produced no more smoke/fumes. This was an attempt to make a rapidly oxidizing powder in air. It was very blind science, I am sorry to say. It...

In beta decay, an antibuetrino or an positron is emitted from the nucleus. how is this possible? how can antimatter come directly from matter? This is pizzling...:confused:

One of the great theories of physics is the theory of special relativity. This theory is based on two concepts: - 1. The speed of light is constant. 2. The laws of physics are the same in any inertial frame, regardless of position or velocity Given the validity of these concepts...

Can an e-p pair be created simply from field interactions rather than brute force collisions of atomic nuclei?

I've posted a similar question to the high energy forum. As I understand it, LEDs emit photons when electrons and holes have sufficient energy to cross a particular "well". I'm sure this explanation is lacking in many key ways. Why can't we "tune" the gap to create electron-positron pairs and...

Ask for Help: Is this operator reasonable in physics? Is this kind of the operator is reasonable in physical sense? $\sum\limits_{\bf k_x,k_y} \alpha k_x c^\dag_{k_x,k_y}c_{k_x,k_y}$ where $\alpha$ is contant, k_x , k_y is wavevector along the x and y direction.

If we would get to 99,9...% c will we become a black hole?

Hello, I just have a quick question, if people would know the exact mechanics of the universe, by all means, would it be possible to also derive the exact theory of creation of the universe? I think no, but I'd like to hear something from you, as you're more educated in this. Thanks,

Hello, Haven't been here in a while. Does the Linear Combination of Atomic Orbitals (LCAO) method of developing a basis set imply tight-binding ? Is there a way of using this basis set for not so tigtly bound (there is appreciable overlap) atomic orbitals and still maintain orthagonality...

I'm interested in synthesizing complex waveforms using sine waves. I know that when two sine waves which differ slightly in frequency from one another are summed, amplitude modulation (AKA "beating") with a frequency equal to the difference in frequency between the two sine waves ensues. This...

I am curious as to whether quantum particle-pair creation could be responsible for cosmological inflation. Question 1: Is there any theory about quantum particle-pair creation effect on local space-time? Obviously, where a particle exists there is gravitation, where no particle exists there...

I was wondering if Dark Energy, and Dark Matter, could be a product of quantum field particle-pair production? If you know of any links or papers supporting or invalidating my thoughts below, I'd love to hear about them! Dark Energy makes up 73% of the universe, Dark Matter makes up 23% of...

Has anyone had any experience with this? I'm interested in what the programming interface is like and what level of stuff you can make.

In Chapter 6 of M. Kaku's book (QFT), he wrote (p184) "...by rotating the diagram around, we can convert bremsstrahlung into pair creation." Bremsstrahlung, as far as I know, involves atoms. Does this mean that when bremsstrahlung with >1.2 MeV strikes an atom we will get an electron and a...

All right, so what I don't understand about the big bang theory is that when it describes the creation of atoms, does it mean that the particles were already in existence and the explosin only made the particles come together? or were the particles actually created by the big bang? If the...

Hi, I am wondering when you want to burn a film or documentary to a dvd to watch on your home tv theatre, how do you go about it. I have aload of science documentaries that I want to burn to dvd and when I do my dvd player downstairs cannot read the dvd cd. Why is this? Do I have to convert...

After an abortive start in the new IR Forum I am beginning a new thread on the published theory of Self Creation Cosmology. There has already been many posts on the subject in PF and I apologise for any repetition, but having been asked to post it here in A&C I here make a clean start! The...

I was reading some stuff about the big bang and about the singularity. When the big bang happens, is a whole lot of matter just created? And, Are Photons counted as matter? Thanks

SpaceTiger has created a very valuable thread on Mainstream Cosmology. For good scientific practice it is important to compare standard theories with testable alternatives, however ST's thread is not the place to do it. The theory of Self Creation Cosmology (SCC) presents itself as such a...

Hi, I'm studying my astronomy course at the moment and i have question about the r- and s-process. As I understand it, in the r-process, the time between capturing two neutrons is shorter than the averge beta decay half life, right? So I'm guessing there have to be a lot of neutrons around for...

"Creation of Black Hole Detected" http://www.space.com/scienceastronomy/050509_blackhole_birth.html

just a simple question: do u think matter can be created? nowadays some scientists do believe that and what's your reason?

My Question has to do with the apparent creation of energy; Say if one were to some how find a large rock in deep space (where no other gravitational fields existed) and bring it into the proximity of a large mass, say a star, It would be safe to say that it would accelerate towards this...

what is the average size of a domain? and how are "permanent" magnets made? thanks, erin.

Isn't possible to delete and remove columns after a table has been created? Rows works just fine but columns don't...

¿ Can entropy be simultaneously created and destroyed in different partes of the universe of a process?

It was in response to this https://www.physicsforums.com/showthread.php?goto=newpost&t=41878 The biggest gap of them all and it is found in the most unlikely place? http://www.sukidog.com/jpierre/strings/mplanck.gif High energy particles have extremely small wavelengths and can probe...

A 2s electron in a hydrogen atom has more energy than a 2p electron. Quantum field theory says this is because the 2s electron interacts with itself by emitting and absorbing a photon.But what if the proton and the electron carry a charge which is always repulsive.Then a 2s electron which is...

The biggest gap of them all and it is found in the most unlikely place? http://www.sukidog.com/jpierre/strings/mplanck.gif With Marcus's introduction to Words of Stephen Hawking and "predictions" what might we find from such a talk? We know well this could all be dismissed very easily...

Dear forum members, may I post on this Forum my questions about GR and a brief description and link to my work in which they are answered? Questions of General Relativity (Also posted on the Special and General Relativity Forum) 1. In the presence of gravitational fields the...

Poll regarding creation of an "Engineering Napster" thread Hi all, I've been debating starting one of these for a while, and Tom just mentioned that he's got enough engineering links stored up to start one. What is the consensus about how you all would like to see napster threads?

This may be a naive question, but... I know that quantum mechanics prescribes various possible paths given an initial and final state. But is there a principle that is responsible for predicting the necessity of an initial state to begin with? We have QM accounting for all the possible paths...

Hi folks, Sorry for this second post so quick but its bugging me! I have been reconsidering some fundamentals of electrics and have opened a can of worms for myself (thanks Cliff for closing the lid on the previous one). If i consider again a simple closed DC circuit consisting of a wire and...

http://arxiv.org/abs/astro-ph/0401136 The theory of Self Creation Cosmology is described and found to be as concordant as the standard cosmological 'concordance model' with local experiments and cosmological observations. However it does not require the speculative hypotheses of inflation...

It seems rather odd to me energy mass equivalancy of pair creation would be the same as for the the energy mass equivalancy of direct conversion of energy to mass with increased velocity. In the first case you are not only creating mass but you are also creating particles.In the the...

I saw this real cool show last night on the science channel about the formation of the moon where it talks about a Mars sized planet that was between the Earth and Mars. This planet crashed into Earth creating the moon. I was aware of this theory, but had not heard that the space rock that did...

Hello, I am new to this forum so I'm not even sure if my question belongs here. Anyway, i am aware that the sun has the natural ability to create new kinds ot atoms through it's gravitational force but can it or anything in this universe create Energy?

A Theory of The Maintenance, Re-Creation and Re-Generation of The Universe As We Know It December 9, 2003 I am going to assume that this idea has already been submitted numerous times in scientific circles. I'll submit it anyhow based upon the experience I have gained which has shown me...

I'd like someone to poke some holes in this theory so that I can see what I might have missed in my mind. First this assumes a few things: A.) That dark energy, exotic matter, or some other form of anti-gravity exists B.) That the combined anti-gravity pull of all the anti-gravity in the...

I watch and see this continual barage of foolish conversation upon fired sand structures, but no one knows the sand or addresses it. From the sand comes all things made. Like from the water or from the air. I challange any of you on this forum all of you inlcuding you outside this forum or to...

could our universe be created by a massive object traveling >c slowing <c and condensing?