What is Quantum particles: Definition and 24 Discussions

In most theoretical physics such as quantum field theory, the energy that a particle has as a result of changes that it itself causes in its environment defines self-energy


{\displaystyle \Sigma }
, and represents the contribution to the particle's energy, or effective mass, due to interactions between the particle and its environment. In electrostatics, the energy required to assemble the charge distribution takes the form of self-energy by bringing in the constituent charges from infinity, where the electric force goes to zero. In a condensed matter context relevant to electrons moving in a material, the self-energy represents the potential felt by the electron due to the surrounding medium's interactions with it. Since electrons repel each other the moving electron polarizes, or causes to displace the electrons in its vicinity and then changes the potential of the moving electron fields. These and other effects entail self-energy.

View More On Wikipedia.org
  1. A

    I Plasma-like Description for Elementary and Composite Quantum Particles

    My article has been published in Entropy . Abstract: Schrödinger noticed in 1952 that a scalar complex wave function can be made real by a gauge transformation. The author showed recently that one real function is also enough to describe matter in the Dirac equation in an arbitrary...
  2. J

    How to find von-Klitzing constant based on graph?

    Hi all, Given that the question: From what i know , I am not sure how this equation can help me estimate the von-klitzing constant? Or is there another way? Thanks!
  3. M

    Evolution of a particle in a well

    Homework Statement I posted a picture of the question https://imgur.com/a/8byywYL Homework Equations P = $$(<\psi_{n}|\psi_{o}>)^2$$ The Attempt at a Solution I am guessing that I compute(denote by ##\psi_{o}## the ground state of the old well and by ##\psi_{n}## the ground state of the new...
  4. R

    System of Two Quantum Particles

    Homework Statement Consider a system of two quantum particles. Each particle has two quantum states, one with zero energy and one with energy ε>0. For each of the three cases, draw a table of the possible microstates α of the system, and find the canonical partition function Z(β). a)The two...
  5. diPoleMoment

    B Black hole emits quantum particles from the mass sucked in?

    So the Hawking radiation and the flinging of matter from the black hole, could this explain where all the matter goes? I am unsure of the theory for the second one, but if matter is broken to its quantum particles then why can't those quantum particles be in the Hawking radiation. Still very...
  6. J

    What are the latest developments in quantum mechanics and thermodynamics?

    Hello. My name is Jon rotsler I'm an avid independent researcher when I have the time. I have a huge interest in quantum mechanics I'm also bid on thurmo dynamics and magnetic. But rarely have time to do all the fun things I would like so I'm settling for good discussion and a bouncing around of...
  7. A

    A Bound states and the energy-momentum relation....

    Hi all - forgive me, I'd asked a series of questions in a previous post that was deemed to be circular, but I still didn't obtain a satisfactory answer to the question I was asking. In this post, I'm going to try to be very careful to use terms that are at least less 'misplaced', per se...
  8. TheQuestionGuy14

    B If quantum particles can move to other universes, can macroscopic things move?

    I was just wondering if macroscopic things like a book or even a human can travel to another universe, like quantum particles.
  9. J

    B The perfect relativistic quantum particles simulation

    How would a physicists expect a perfect relativist quantum particles simulation to look like? Can anyone give a description of its functionality? Let's say for example, someone would program a simulation, composed of a 4D space-time diagram. Within this simulation are a large amount of quantum...
  10. M

    Why electrons never make contact with the nucleus?

    Hi everyone: This concept has bothered me for a while. The concept being that two oppositely charged particles (electron and proton) are attracted to each other, but the electrons go on a orbital trajectory around the nucleus instead of directly "sticking to" the nucleus. The closest I have...
  11. D

    Dispersion relation for non-relativistic quantum particles

    In class I learn that we can get the dispersion relation for particles by using E=hbar*w and p=hbar*k. The calculated phase velocity is w/k = hbar*k/2m, while the group velocity is dw/dk=hbar*k/m. All these make sense to me, except one thing: I always thought that E=hbar*w=hf is only applicable...
  12. J

    What Is the True Nature of Electrons According to de Broglie's Theory?

    This is going to seem like it should be an educational question, and perhaps it should, but please bear with me, because I think that it has theoretical content. A nice quote that I recently heard someplace went something like: "We used to argue about whether electrons [etc] were particles or...
  13. jk22

    Can Quantum Particles Meet Everywhere on the Diagonal?

    Since particles have their own space i heard they cannot meet. But how about the origin if we see the axes perpendicular ?
  14. J

    How is the presence of a *single* electron determined?

    The 2 slits experiment can be carried out by firing a single electron at a time and then over time observing the gradual build up of what appear to be interference patterns characteristic of a wave passing through the 2 slits on the screen behind the slits. This is despite the fact that the...
  15. J

    Does Quantum Precession Contradict Traditional Spin Directions?

    Hi pf. From what I have read, when measured, a particles spin can only be in one direction. So either 100% spinning up or 100% spinning down and not in between. So, you can't have a spin that is in between (tilted) - it must be one or the other. But I recently learned that when we place a...
  16. SalfordPhysics

    Quantum State diagram for system of particles

    Question: "Write the quantum state for the following system of particles distributed over evenly spaced energy levels" The diagram (couldn't upload so hope its not too rough): 5 ---------------------- 4 ---------------------- 3 --------------X------- 2 ------X---X------X---- 1...
  17. A

    Does all quantum particles exist?

    Does all types of quantum particles exist all time? If so where are charm and strange, top and bottom quarks located in an atom?
  18. Spinnor

    Quantum particles expand space?

    If we put a quantum particle in it's ground state in a cylinder with a movable piston there is an outward force on the piston? If we now put a quantum particle in the universe is there an outward force on space time however small? Thanks for any help!
  19. mrspeedybob

    Can macroscopic objects interfere with themselves like quantum particles?

    Consider this experiment... A satellite is put into orbit around Mars and the date of the experiment is set for when Mars is directly opposite the sun from earth. This puts it about 21 light minutes away from earth. Assuming there are no aliens watching it is absolutely impossible for any...
  20. p764rds

    Exploring Quantum Particles as Information

    A wave packet carries information such that when an observation is made, what is received is information, that reveals spin or position etc. All 'particles' at the quantum level can be described by wave packets and the states of those wave packets could be represented by information. The true...
  21. P

    Relativity fails with quantum particles?

    It seems to me there is a problem with special relativity - at least involving a particle which is commonly used as evidence to support it! Am I missing something? Here it is: A spaceship is stationary in space next to the moon. An interstellar muon traveling near the speed of light passes...
  22. homology

    Understanding Direct Product States in Linear Algebra

    So why is it that if you have a system with two distinguisable particles why is their state vector written as |psi>=|psi_1>|psi_2> what's this product? Is this product still "in" the original hilbert space? Kevin
  23. Bob3141592

    Can We Model Chess Pieces as Quantum Particles?

    Does anybody in this forum play chess? Or have an idea of how computer chess programs work? Even the very best of them, and lately they have gotten very, very good, work more or less the same way, and always have. In those algorithms, after the move generators and transposition tables and...