What is Interaction: Definition and 711 Discussions

Interaction is a kind of action that occurs as two or more objects have an effect upon one another. The idea of a two-way effect is essential in the concept of interaction, as opposed to a one-way causal effect. Closely related terms are interactivity and interconnectivity, of which the latter deals with the interactions of interactions within systems: combinations of many simple interactions can lead to surprising emergent phenomena. Interaction has different tailored meanings in various sciences.

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  1. ShayanJ

    Spin-Orbit interaction in nucleus' rest frame

    In all the places where Spin-Orbit interaction is discussed, the equations are derived by going to electron's rest frame and considering the interaction of nucleus' magnetic field with electrons spin magnetic moment. But from SR, we know that there as to be an explantion from the nucleus's rest...
  2. C

    Hartree-Fock correction to e-e interaction

    The corrections to the energy per electron in a jellium model (uniform distribution of positive ion charge approximation to the regulated long range order ionic array) is given by (in units of Ry) $$E/N = \frac{2.21}{(r_s/a_o)^2} - \frac{0.916}{(r_s/a_o)} + 0.0622 \ln (r_s/a_o) - 0.096 +...
  3. P

    Spin-orbit Interaction & Degenerate Perturbation Theory

    Hello! This is my first time posting, so please correct me if I have done anything incorrectly. There's something that I don't understand about the spin-orbit interaction. First of all I know that [\hat{S} \cdot \hat{L}, \hat{L_z}] \ne 0 [\hat{S} \cdot \hat{L}, \hat{S_z}] \ne 0 so this means...
  4. J

    What are shock interaction regimes?

    I have been asked to determine the "shock regime" of a oblique shock / bow shock interaction based on the angle of the impinging shock and flow conditions. What does this mean? My initial thoughts were that I was being asked to determine whether the shock was strong or weak, but since the...
  5. P

    Magnetic interaction of wire and rectangular loop

    Hi. In this video: he ignores the magnetic field from current 2(I2). Could anyone give me a good explanation why?
  6. mokeejoe5

    Understanding the Weak Interaction: What Causes It & What is Its Range?

    Recently it struck me that I'm not sure I understand the weak interaction at all. What causes it to happen? I know that its mediated by the W and Z bosons and has a short range as a result of the large mass these bosons posses, but what does that range refer to? Range from what?!
  7. Davephaelon

    Neutrino-to-neutrinos interaction possible?

    Could an energetic neutrino (of any flavor), on passing near an electron, nucleon, or nucleus, be stimulated to emit a neutrino pair (of any flavor)? An example might be an energetic electron-neutrino, passing close to a nucleus, and emitting a muon-neutrino/muon-antineutrino pair., with the...
  8. D

    Interaction between light and hydrogen atom

    If a symmetric distribution of charge has no electric dipole moment, where does the \mu term we write in the part of the hamiltonian representing interaction with light come from? We suppose it is induced by the electric field of the light?
  9. E

    Gauge invariance of interaction lagrangian

    Anyone can help me how to argue that interaction lagrangian is invariant under gauge transformation?
  10. S

    Spin inversion under dipole-dipole interaction of fermions

    Homework Statement Consider two spin 1/2 particles interacting through a dipole-dipole potential \hat{V} = A\frac{(\hat{\sigma_1} \cdot \hat{\sigma_2})r^2 - (\sigma_1 \cdot \vec{r})(\sigma_2 \cdot \vec{r})}{r^5} If both spins are fixed at a distance d between each other, and at t = 0 one of...
  11. DennisChen

    How does QED explain charge interaction in the macro world?

    I have personally been deeply fascinated by the processes and principles that underlie the QED and have done some recent research myself. However, recently my teacher posted me a question that stunned me. He went,"Why do like charges repel and unlike attract?" In QED I understand that this is...
  12. M

    Exploring the Interaction Model of a 3D Hypersurface

    Homework Statement This is not homework but relevant to an interaction model that I am developing. I assume an even distribution of sources on a spherical 3d-hypersurface, the sources having a potential as a function of pairwise 4-distance between any two sources. I wish to obtain the sum...
  13. B3NR4Y

    Bouncing Ball Dissipative Interaction

    Homework Statement A 0.62-kg basketball dropped on a hardwood floor rises back up to 64% of its original height. If the basketball is dropped from a height of 1.6m , how much energy is dissipated in the first bounce? How much energy is dissipated in the fourth bounce? Homework Equations U(x) =...
  14. fluidistic

    Ising model without spin-spin interaction

    Homework Statement Hey guys! I'm not convinced by what I obtained so far, please tell me whether I'm in the right or wrong direction. The Hamiltonian has the form ##H=-h\sum _i s_i## where ##s_i=\pm 1## and ##h=kT##. 1)Calculate the partition function and the Gibbs free energy. 2)Calculate the...
  15. C

    What kinds of divergences for a given interaction

    Can you look at an interaction term in your lagrangian or hamiltonian, like L_{\rm int} or H_{\rm int}, and say immediately how its diagrams will diverge (as in quartic, quadratic, linear, log, etc.)?
  16. W

    Electrostatic interaction energy between a charge rod and ring.

    Homework Statement Thin rod of the length l is placed with one of its ends placed at the center Oof the thin ring of radius R as shown, perpendicular to the plane of the ring. Rod is charged with total charge Q that is distributed along the rod’s length with the linear charge density...
  17. P

    Interaction of photons with charged particles

    Can someone please tell me the name of the theory describing the interaction of photons with charged particles eg electrons, protons? Can you also suggest a good introductory web page describing that theory at First Year University level for self study? Better still, a good VIDEO lecture on...
  18. wolfspirit

    Hadron interaction via strong yet k mesons decay through weak

    Hi, I have been getting a little confused; the textbook (and from what i can see on-line) are saying that Hadrons only interact through the strong interaction (along with the electromagnetic force if charged Q) and yet K Mesons decay through the weak interaction. If my understanding is correct...
  19. M

    Interaction of matter and radiation

    To whom is able to answer this: I think that when radiant energy get in contact with matter three basic phenomena take place: 1.- Transmission 2.- Reflection 3.-Absorption and emission I think this three basic phenomena enclose all phenomena that can occur after the interaction I wait for...
  20. akashverma

    Force of interaction between magnets

    hi, I'm a student and i have an electromagnet and a bar magnet paced head on coaxially and i want to calculate the force between these two when the distance is around 0.5 cm. please help I'm unable to find anything useful after browsing various websites. Thanks in advance.
  21. S

    Spin-Orbit Interaction - Meaning and Some Mathematics

    Hi, In many quantum physics books I see questions such as "what is the spin-orbit interaction in this case?" Sorry if this seems like a dumb question, but what do they mean by this? Do they mean the ENERGY of the spin-orbit interaction or something else? Also, could anyone give (or write a...
  22. R

    Graduate level Laser-Plasma interaction

    Hey has anyone had experience with a good book on Laser-Plasma interaction at a graduate level? I've seen a few on amazon and the like but they rarely have reviews so I have no idea how good they are. Thanks you!
  23. R

    Coulomb interaction not affected by presence of other charges

    One of the observation noted in connection with coulomb interaction is that, it is not affected by the presence of other charges. Why? Thanks.
  24. Hepth

    Feynman Diagram setup for 4-fermion interaction loop

    If one has a 4-fermion vertex, like in Fermi theory : ##G_f (f_1 \Gamma f_2)(l_1 \Gamma l_2)## And you are calculating a one-loop diagram where you have the diagram of : f1-> f2,l1,l2 -> f1 (used for dispersive/unitarity approach) Where in the end you'll use Cutkosky rules to calculate...
  25. Q

    Heisenberg Uncertainty due to interaction of the inherent reality?

    Coming from a Chemistry background, the Uncertainty Principle always seemed to be described as an inability of precision due to strictly physical and real reasons (i.e. you have to interact with an object to measure something about it, and this certainly will alter the object). It seems as if...
  26. A

    Interaction between 2 charges moving at the same velocity

    How does a moving point charge affect another point charge moving at the same velocity and separated by some distance in one direction relative to an observer whom the charge are moving? What formula describes that interaction?
  27. S

    Interaction of three black holes

    dear sir i want to know theoritically what would happen when three black holes are near by and exert influence on each other.
  28. Einj

    What is the non-local interaction in HQET?

    Hi everyone. I have been studying the Heavy Quark Effective Theory and at a certain point we have a Lagrangian like: $$ \mathcal{L}=\bar h_v iD\cdot v h_v+\bar h_vi\gamma_\mu D^\mu_\perp\frac{1}{iD\cdot v+2m_Q}i\gamma_\nu D_\perp^\nu h_v. $$ h_v is the field representing the heavy quark, v...
  29. M

    Photon interaction with atoms in transparent medias

    Dear All, I have read many posts on this forums about the interaction of photons with the atoms of transparent materials. The point that I was searching for in particular was "why is the speed of light in transparent material less than c". The explanations given by many about the absorption...
  30. H

    Why do we integrate over the relative momentum of interacting particles?

    When we describe the amplitude of two interacting particles, we are integrating w.r.t the relative momentum of the particles. Why we do this? Thank you all of you.
  31. R

    Derive the van der Waal interaction between 2 spheres.

    Hi guys, I need some help on this question: Derive the van der Waal interaction potential between 2 spheres of radius R_1 and R_2 using the Hamaker approach. Take the distance between the center of each sphere to be D. Thank you very much for your help!
  32. C

    Ground state splitting due to spin interaction

    Homework Statement The interaction between the spins of the two particles in a hydrogenic atom can be described by the interaction Hamiltonian $$\hat{H_I} = A \hat{S_1} \cdot \hat{S_2}.$$ Compute the splitting of the ground state due to ##\hat{H_I}##. Both particles have spin 1/2. Homework...
  33. N

    Neutrinos incident on target - interaction with nucleons or nuclei?

    I came across a worked example question in a particle physics book this morning that had a beam of neutrinos of energy 2.3MeV incident on a lead target. The point of the question was calculating the thickness of lead needed to reduce the beam intensity by a certain fraction - and the solution...
  34. K

    Why EM and weak interaction are unified

    In SM, people say the ##SU(2)\otimes U(1)## theory unify the EM and weak interaction. I understand that the two interactions both originate from the electroweak theory in a mixed way. But does this mean they are unified? Since when we talk about unification like GUT, we require the couplings run...
  35. Primroses

    How to Determine the Range of Strong and Weak Interaction

    How can we determine the ranges of strong interactions and weak interactions? Can calculations of relevant scattering cross sections do this? Thanks.
  36. Saitama

    Force of interaction between caps

    Homework Statement Homework Equations The Attempt at a Solution I can extend the bigger cap with charge density ##\rho_2## and make it a complete sphere. If I do this, I must replace the smaller cap of charge density ##\rho_1## with a cap (of same dimensions) of charge density...
  37. R

    Microscopic description of glass-light interaction

    Hi all, could you suggest me references that can help me in the following calculation? I would like to see how to describe microscopically the interaction of light (or in general of an external field) with a disordered system such as glass ( I can find literature only for materials modeled...
  38. B

    Understanding Spin-Orbit Interaction's Impact on Electron Energy Levels

    Fron wiki: spin–orbit interaction causes shifts in an electron's atomic energy levels due to electromagnetic interaction between the electron's spin and the magnetic field generated by the electron's orbit around the nucleus. This is detectable as a splitting of spectral lines. The...
  39. X

    Time Evolution operator in Interaction Picture (Harmonic Oscillator)

    Homework Statement Consider a time-dependent harmonic oscillator with Hamiltonian \hat{H}(t)=\hat{H}_0+\hat{V}(t) \hat{H}_0=\hbar \omega \left( \hat{a}^{\dagger}\hat{a}+\frac{1}{2} \right) \hat{V}(t)=\lambda \left( e^{i\Omega t}\hat{a}^{\dagger}+e^{-i\Omega t}\hat{a} \right) (i)...
  40. M

    Universe With No Weak Interaction

    Hello, I have a homework problem posing the following hypothetical situation Imagine a hypothetical universe in which weak interactions do not exist and only first-generation quarks and leptons are present (i.e. there are no charm, strange, top or bottom quarks, and no muons, muon...
  41. P

    Electricity and Air: A Fascinating Interaction

    A bird perches on a bare high power line and nothing happens to it. A man standing on the ground touches the same line and gets a fatal shock. This is supposed to be because there is potential difference between the ground and the line which the man touches but similarly, isn't there also a...
  42. W

    When can the exchange interaction be neglected?

    i guess in the wigner crystal, the exchange interaction between the electrons can be neglected. What is your opinion?
  43. K

    Magnetic dipole-dipole interaction model

    Hello, I'd like to calculate magnetic dipole-dipole interaction energy. Actually, I've tried to find models for the calculation, but most of them are just a simple point dipole-dipole interaction model. I can't utilize this simple point dipole-dipole interaction model directly because...
  44. maajdl

    Ising model, same interaction with all spins

    Hello, I just read a question about the Ising model, and this reminds me of an old interrogation I had long ago. It is simply that: The Ising model deals with spins interacting only with close neighbors. I would be interested in a model where all spins interact with each other in exactly the...
  45. P

    Two-orbital system w/ tight-binding and Coulomb interaction

    We have a system of two orbitals 'a' and 'b'. The Hamiltonian is given as: $$H=\sum_{\sigma=\uparrow,\downarrow}(\epsilon_a A_\sigma^\dagger A_\sigma+\epsilon_b B_\sigma^\dagger B_\sigma) -t\sum_{\sigma=\uparrow,\downarrow}(A_\sigma^\dagger B_\sigma+B_\sigma^\dagger A_\sigma)+U...
  46. N

    Beta particle interaction with matter

    A beta particle consists of a fast moving electron emitted from the nucleus of an atom. Beta particles can pass through the palm of a human hand. My question is .. Being a particle how can it pass through the palm of a hand? I still haven't done quantum Physics but I suspect that it has...
  47. lfqm

    Understanding Coherent Interaction in Dicke Model

    Hi! I would really appreciate you to help me answer this question: What is the physical meaning of coherent interaction (in the Dicke model for example)? I mean, coherence is well defined in classical optics, but what does it means when you ask for a system of N atomic dipoles to interact...
  48. C

    Drude model electron interaction

    In every source I've checked so far, we make the assumption that we can neglect electron-electron interaction in this model but they always fail to give any reason to answer why this is plausible. Does anyone know how physicists convinced themselves of this at the time and even now (other than...
  49. N

    What is the Lagrangian of interaction of photon and spin zero scalar?

    What is the Lagrangian of interaction of photon and spin zero charge scalar?The vertex of photon and spin 1/2 charge fermion is proportional with e multiplied vertor gamma matrix,but I do not know what is the vertex of photon and charge scalar.I hear that a vertex is proportional with polynomial...
  50. J

    Interaction of radiation with matter

    Hi, please could someone help as I have got myself desperately confused with how radiation interacts with matter largely because of conflicting sources on the internet. Apparently there are 2 main types of interaction of radiation with matter; atomic/molecular vibrations and electron...
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