Interaction Definition and 653 Threads

  1. Ranku

    I Gravitational interaction between three bodies

    If there are three bodies A, B, and C arranged linearly, and B is free falling towards C, will the gravitational presence of A affect the rate of free fall of B towards C?
  2. M

    I Field Renormalization vs. Interaction Picture

    When introducing renormalization of fields, we define the "free Lagrangian" to be the kinetic and mass terms, using the renormalized fields. The remaining kinetic term is treated as an "interaction" counterterm. If we write down the Hamiltonian, the split between "free" and "interaction" terms...
  3. Diracobama2181

    Is There a Relationship Between Dipole and Wire Interaction Energy?

    Part a was not much of a problem. I got that $$m=QR\omega \hat{z}$$. From that, I get $$A_{dip}=\frac{\mu_0}{4\pi}\frac{QR\omega}{r^2}\hat{\phi}$$ (using $$\theta=\frac{pi}{2}$$. My problem occurs in part b. I know there is a potential energy relation for two dipoles, but what would I use for a...
  4. M

    What is the electrical equivalent circuit for this interaction?

    A textbook gives an example of an ideal mass striking an ideal string here: This is drawn as an equivalent electrical circuit as follows, where each R represents one of the two string segments the mass interacts with (ie. the string segment to the left of the mass and the string segment to...
  5. S

    I When is weak interaction a force?

    When is weak interaction actually a force, rather than merely cause of some process? Not in beta decay - it is process. There are simpler weak interaction processes around: elastic scatterings that change only momentum but not taste. But those are still processes and are over as the particles...
  6. Riotto

    I Single-particle phase spaces for a system of interacting particles

    For a system of interacting particles, is it possible to define single-particle phase spaces? If not, why?
  7. J

    I Understanding the Absence of Rabi Oscillations in the Interaction Picture

    When working on the interaction picture you can show that in a certain rotating frame the Hamiltonian of a 2-level system (for example) becomes uncoupled. This implies that in such frame there are no Rabi oscillations or other dynamical phenomena, this seems weird to me and I would like to know...
  8. Zala Jaydevsinh

    I About L-S interaction or spin orbit coupling

    I want to understand this topic but I can not understand very well so please suggest any reading for good conceptual grasp of this topic.
  9. Diracobama2181

    A Solving Spin-Spin Interaction for Total Spin Commutation

    Let there be four spin (1/2) particles at the corners of a tetrahedron, coupled such that the total hamiltonian is given by $$H=\sum_{i\neq j} S_{i} \cdot S_{J}$$. How would I go about showing that each component of the total spin $$\sum_{i} S_{i}$$ commutes with the hamiltonian. Work so far...
  10. binbagsss

    A Kubo Formula Deriviation - interaction picture, complete eigenbasis

    Hi I'm looking at David Tong notes on QHE http://www.damtp.cam.ac.uk/user/tong/qhe/two.pdf (page 56), I've attached the relevant screenshot below also. I understand we are working in the interaction picture whereby states evolve via the Unitary Operataor EQ 2.10 in the notes(I think this is...
  11. CuriousCop

    I Observation = interaction, question from a dummy

    Greeting all! So I apologize if this has been explained to death and if so, please advise as I do not want to clog up the forums with the same questions over and over. A little background first, a coworker and I routinely talk about astrophysics and quantum mechanics( yes, somewhere out there...
  12. S

    I Interaction of Neutrons with Matter

    For Elastic neutron interactions with matter, they mentioned that the neutron will collide with atomic nucleus and the recoil nuclei quickly become ion pairs and loose energy through excitation and ionization. How does this nuclei become ion pair? It is when the neutron interact with it and...
  13. J

    B Interaction of light with atoms

    One description of the interaction light with atoms states "Light waves incident on a material induce small oscillations in the atoms, causing each to radiate a small secondary wave in all directions". And another that "A photon with the right energy causes an electron to jump up to the next...
  14. Student abc

    I Interaction path = mean free path?

    Are the interaction path and mean free path of a particle the same thing?
  15. N

    I What exactly is the amplitude of an interaction?

    I've been reading Griffths' intro to elementary particles and I encountered this symbol that looks similar to "M" called amplitude, which can be calculated by analyzing the Feynman diagram of an interaction. What exactly is it? When I hear amplitude I imagine waves, but not sure what this one's...
  16. fluidistic

    A Can the electron-electron interaction have an impact on the conductivity?

    Can the electron-electron interaction have an impact on the conductivity? Google seems to point out that yes for some 2d materials such as graphene. But what about 3d materials? Intuitively, any lost momentum by an electron would be gained by another electron, so in average, this e-e...
  17. B

    A Understanding & Solving Electron/Phonon Interaction Problems

    I am wondering if there is a book with solved example problems I can follow so that I can carry out the following calculation: I have a set of unperturbed electron Green functions $g^{r0},g^{a0},g^{<0},g^{>0}$ and phonon Green functions $d^{r0},d^{a0},d^{<0},d^{>0}$ which are for a central...
  18. P

    I Electrostatic interaction in the Simulation Hypothesis

    How will the repulsion of electrons occur in the simulation hypothesis? The electrons will also create electrostatic fields around yourself ?
  19. C

    I Dark Plasma charged under unbroken U(1)' gauge interaction

    https://arxiv.org/abs/1512.06471 In the paper, dark plasma (that is, NOT baryonic plasma) was suggested. I'd like to know if it is compatible with many cosmic phenomena (like bullet clusters). Can you think of one where the data (especially new ones) don't support it? In baryonic matter...
  20. ABlibo

    Understanding Energy Levels and Transitions in Magnetic Fields

    Don't know how to relate the equations. Thanks for your help.
  21. P

    I Weak interaction between electrons

    The two electrons will be repelled by electrostatic force, but they interact with weak force, means that in addition to the electrostatic force between the electrons there will be weak force?
  22. S

    I Interpreting SM Lagrangian "differential particle" terms

    The Standard Model Lagrangian contains terms like these: ##-\partial_\mu \phi^+ \partial_\mu\phi^-## ##-\frac{1}{2}\partial_\nu Z^0_\mu\partial_\nu Z^0_\mu## ##-igc_w\partial_\nu Z^0(W^+_\mu W^-_\nu-W^+_\nu W^-_\mu)## How should one interpret the "derivative particle fields" like...
  23. B

    Photons and solar wind/plasma interaction?

    Can the suns photons accelerate the plasma/solar wind away from the sun? or is there no interaction between them?
  24. K

    I Why does LHC have 8 interaction points?

    Hello! I attached a picture of the LHC main rings. I see 8 interactions points labeled, even if there are only 4 experiments (and the other 4 points don't even intersect). What are these 4 other points? Thank you!
  25. K

    B Is entanglement severed after the first interaction?

    Do we know if entanglement between two entangled particles is completely severed after the particles interact? By interact I am generally thinking of interacting with the measurement device. Maybe another way of asking my question: In an EPR like experiment, if you put one of the entangled...
  26. D

    B The Nature of Measurement and Interaction in Quantum Mechanics

    I am still confused about the difference between measurement and interaction. I mean when electrons are traveling from source to the screen through the slits, there are air molecules in their way. And even if the electron double slit experiment is carried out in total vacuum in a completely...
  27. D

    Does Stiff Soil Resonate with Short Storey Buildings During Seismic Movements?

    Stiff soil like tuff rock is said to be in resonance with short storey buildings (like 2 to 3 storey).. meaning during seismic movement the response in the short storey buildings would be greater. Is there any formula that can relate the two... like does stiff soil has the same frequency as...
  28. S

    I Time period in which an interaction with a π-meson happens?

    The longer-range inter-nucleon force is not a direct result of the gluon field, but is indirectly affected by a quark-antiquark pair (meson). If this ‘residual’ strong interaction between nucleons is mediated by a π-meson, then what is the maximum time period in which the interaction takes...
  29. C

    I Strong force as exchange of mesons, or of quark and antiquark

    The (residual) strong force between nucleons can be desribed as - The exchange of a meson (from a nucleon to the other), as in picture b) - The exchange of a quark and an antiquark: in picture a) one nucleon "gives" a quark and receive an antiquark and it's the opposite for the other I do...
  30. Gene Naden

    I Weak interaction - is it a force?

    A friend, well-read in popular accounts of physics, posted the following question to me: is the weak force attractive or repulsive? Now I have read about the weak interaction. I know that it violates parity, that it is involved in beta decay, that it unifies with the electromagnetic interaction...
  31. C

    I Measuring characteristic time of strong and weak interaction

    Consider a scattering between two particles a and b that produces two particles c and d: d is stable, while c decays in two other different particles e and f. The first interaction is by strong force (time of interaction ##t_1\sim 10^{-23}s##, which is also the time of generation of c and d)...
  32. Soffie

    B Why is this interaction forbidden?

    So I'v been told that this interaction : e- + e+ = mu- + e+ isn't allowed. Why not? I thought maybe because the mass of the muon is so much bigger, so would violate energy conservation, but the electron/positron could be moving relativistically and thus have enough energy. Apparently the...
  33. Soffie

    B Distinguishing between interactions (decays and collisions)

    I always struggle to know which force (strong nuclear, electromagnetic, weak, gravity) is responsible for an interaction. For example, pi+ + pi- = neutron + pi0 I would say its strong force responsible, because quarks are involved. But the pions are also charged, so how do I know it's not...
  34. G

    I I want to read about the electron nucleus interaction

    My unreliable memory is that although Schrödinger's equation treats the interaction between an electron and the nucleus as unquantised, it is more generally thought to be mediated by an exchange of quanta between electron and nucleus. I want to check on this and get a better understanding. Can...
  35. Superfluid universe

    I What is the charge for the weak interaction?

    We have the electric charge for the electromagnetic force, the color charge for the strong force. What is the charge for the weak force? Thank you. :)
  36. N

    A Electron-Hole- or Many-Electron Exchange Interaction

    Hello together, I'm interested in the electron-hole exchange energy. I would like to see how and have a proof why electron-hole exchange works. Is it symmetric or antisymmetric? More specific, I would like to have a proof that exchange with paired electrons in a molecule can be neglected...
  37. O

    I Interaction time between charged particles

    Hi, I was wondering that if there is some kind of interaction time between two charged particles. Imagine an electron shoot to ionize an atom. This electron interacts one of the electrons in the atom. Does the ionization depend on the velocity of the incoming electron? Is it possible that when...
  38. B

    I Universe's First Stars Interaction with Dark Matter

    https://www.space.com/39837-first-stars-universe-fingerprints-dark-matter.html...
  39. hilbert2

    A Coupling constants with fractional dimensions

    Most QFT texts, such as Peskin&Schroeder and D. Tong's lecture notes, contain a mention that the renormalizability of an interacting theory requires the coupling constants to have correct dimensions, making scalar fields with ##\phi^5 , \phi^6, \dots## interactions uninteresting. Maybe there are...
  40. heavybuilder

    I Standard Model (Forces interacting with Matter)

    Not the best at physics but trying to understand the standard model. So can someone please tell me if this is right or not and if not, can you explain me why? Higgs bosons reacts with everything that has mass. Electromagnetic force reacts with everything that has charge. Weak force reacts with...
  41. M

    I What Are Fascinating Examples of Emergence for a School Project?

    For a school project, I've got to choose a subject. I chose "Emergence", but I have to narrow it down a little bit. So, that's why I'm creating this topic. The definition of emergence that I use: By emergence, I mean the fact that proprieties of one scale implies other proprieties by changing...
  42. Tom Rauji

    Automotive Suspension interaction with car

    I need help or guidance at a physics level understanding suspension interaction with a vehicle chassis. Here is the problem. I have a very high horsepower car with small tires. The race tracks are prepped with a glue. It is very easy to go over 1500 HP with a pretty high gear ratio. For...
  43. M

    Integration of an interaction force to find potential energy

    Homework Statement A particle that can move along the x-axis experiences an interaction force Fx=(3x2−5x) N where x is in m. Find an expression for the system's potential energy. Express your answer in terms of the variables x and the constant of integration C, where C is in joules. Homework...
  44. robindymer

    B How does vibration affect the Higgs field interaction?

    I have been thinking about the Higgs field and how things interacts with it. I thought about why photons for example does not interact with it while quarks does. It could be because of the size and if when a particle is a certain size it will interact with the Higgs bosons and then slow down and...
  45. Paul Woods

    I What mechanism enables interaction of the fields?

    In Quantum Field Theory, I am led to believe that there is a different field for each type of particle. When particles interact, it is an exchange of vibration between the fields. What mechanism is at play when one field influences another in this way? It seems I've only ever found...
  46. eigenmax

    I How does one find interaction radius for Coulomb barrier?

    For a proton striking an atomic nucleus (in a Cockcroft-Walton accelerator, for example), the Coulomb barrier must be overcome. The calculation of the Coulomb barrier is U = k Z1Z2 e2 / r r is interaction radius. How can I find that? For a proton to enter the atomic nucleus what would it be?
  47. M

    A Does centering variables for regression always result in unchanged coefficients?

    I am studying mean-centering for multiple linear regression (ols). Specifically I'm talking about the situation when there is interaction. When centering variables for a regression analysis, my literature tells me that the coefficients do not change? But when there is some sort of interaction...
  48. E

    Radio waves interaction with other electromagnetic waves

    when it is asked that why radio waves do not interact with the magnetic field of electric wires or magnets, people say that radio waves are not "matter" and they do not have "charge". i really can not understand this for ex think about 2 magnets. The magnet A has a magnetic field and when we put...
  49. M

    A Centering variables, linear regression

    I am working with multiple regression with two independent variables, and interaction between them. the expression is: y = b1x1 + b2x2 and b3x1x2 The question is: does one center both independent variables at the same time, when checking for the significance of the effect of the independent...
  50. L

    I Hamiltonian after transformation to interaction picture

    Dear all, I am encoutering some difficulties while calculating the Hamiltonian after the transformation to the interaction picture. I am following the tutorial by Sasura and Buzek: https://arxiv.org/abs/quant-ph/0112041 Previous: I already know that the Hamiltonian for the j-th ion is given...
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