Quantum Physics Forum

Post thread
Join in expert discussion on quantum physics. Quantum physics is the mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics and Field Theory.

Quantum Interpretations and Foundations

Graduate Understanding Barandes' microscopic theory of causality
Undergrad Propagator of massless Weyl field
  • · Replies 10 ·
Replies
10
Views
2K
Graduate How to measure the two-photon detuning in 3-level system?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Translating the harmonic oscillator
  • · Replies 2 ·
Replies
2
Views
2K
High School Quantum Entanglement & Hybridization
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Finding Eigenvectors of 2-state system
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Numerical method to Lippman-Schwinger equation
  • · Replies 1 ·
Replies
1
Views
1K
High School Atom energy band formation and electron allotment
  • · Replies 5 ·
Replies
5
Views
1K
Undergrad Rewriting of Gibbs Free Energy in Peksin (Equations 13.35/13.36)
  • · Replies 12 ·
Replies
12
Views
1K
Undergrad Classic 'Double-Slit' Experiment Using Time Instead of Space
  • · Replies 3 ·
Replies
3
Views
2K
High School Quantum entanglement and simultaneity
  • · Replies 4 ·
Replies
4
Views
3K
High School Is it possible to measure both position and momentum simultaneously?
  • · Replies 13 ·
Replies
13
Views
2K
Undergrad Does a particle's mass fluctuate.
  • · Replies 10 ·
Replies
10
Views
1K
Undergrad Symmetry and two electron wave function
  • · Replies 7 ·
Replies
7
Views
2K
Graduate Wave-packet in configuration space
  • · Replies 1 ·
Replies
1
Views
1K
Graduate What’s the meaning of decay rate in optical Bloch equations?
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Relation between the density matrix and the annihilation operator
  • · Replies 0 ·
Replies
0
Views
1K
Undergrad Fourier Transform of Photon Emission Hamiltonian
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Identity involving exponential of operators
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Superposition of different spins
  • · Replies 15 ·
Replies
15
Views
3K
Undergrad Why is there an additional prefactor in equation (12.52) of Peskin's QFT book?
  • · Replies 0 ·
Replies
0
Views
1K
Undergrad Where is the mass of a particle located?
  • · Replies 21 ·
Replies
21
Views
2K
Undergrad Weakly interacting electrons in an atom
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Black Hole Information path described in new article
  • · Replies 0 ·
Replies
0
Views
1K
Undergrad Non-Commutation Property and its Relation to the Real World
  • · Replies 19 ·
Replies
19
Views
3K
High School Quantum entanglement and hidden variables
  • · Replies 7 ·
Replies
7
Views
3K
High School What do these wavenumbers correspond to in Raman spectroscopy?
  • · Replies 5 ·
Replies
5
Views
2K
Undergrad Ballentine Equation 5.13 on conservation of momentum
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Von Neumann's uniqueness theorem (CCR representations)
  • · Replies 9 ·
Replies
9
Views
1K
Undergrad Does an electron have a quantum phase frequency?
  • · Replies 36 ·
2
Replies
36
Views
5K
Undergrad Prefactor in Canonical Quantization of Scalar Field
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad Momentum eigenfunctions in an infinite well
  • · Replies 31 ·
2
Replies
31
Views
4K
Undergrad Potential energy of spin anti-alignment
  • · Replies 14 ·
Replies
14
Views
4K
High School Does anything happen in the quantum world?
  • · Replies 12 ·
Replies
12
Views
1K
Graduate Quantum analog of Boltzmann entropy?
  • · Replies 43 ·
2
Replies
43
Views
5K
High School How to show that particle spin includes angular momentum?
  • · Replies 14 ·
Replies
14
Views
2K
Graduate Momentum operator -- Why do we use the plane wave solution?
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad QED Renormalization Counterterm Confusion
  • · Replies 6 ·
Replies
6
Views
2K
High School What are the energy eigenvalues of a harmonic oscillator?
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Interaction of EM radiation with Glass
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad Mach-Zehnder interferometer, but with an entangled beam?
  • · Replies 33 ·
2
Replies
33
Views
4K
Undergrad What is the relation between the Dirac equation and QED?
  • · Replies 7 ·
Replies
7
Views
3K
Undergrad What happens when circular polarization meets a diagonal polarizer?
  • · Replies 20 ·
Replies
20
Views
3K
Undergrad Repeated measurements on a quantum system interacting with other quantum systems
  • · Replies 3 ·
Replies
3
Views
2K
Graduate How to derive Quantum Mechanics in curved physical space?
  • · Replies 6 ·
Replies
6
Views
2K
High School Is a Spin 2 Particle the Key to Understanding Gravitation in Quantum Mechanics?
  • · Replies 26 ·
Replies
26
Views
4K
Graduate Multiparticle Relativistic Quantum Mechanics in an external potential
  • · Replies 22 ·
Replies
22
Views
3K
Undergrad Can Quantum Effects Prevent Reaching Absolute Zero?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Measurement of a superposition and Born's rule
  • · Replies 22 ·
Replies
22
Views
2K
Undergrad What is the true nature of microscopic particles when not interacting?
  • · Replies 4 ·
Replies
4
Views
2K
Graduate Symmetries of particle interacting with external fields (Ballentine)
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Ballentine on construction of the (Galilean) symmetry generators
  • · Replies 17 ·
Replies
17
Views
2K
Undergrad Dot product of two vector operators in unusual coordinates
  • · Replies 14 ·
Replies
14
Views
3K
Undergrad Schwinger-Dyson equations derivation
  • · Replies 3 ·
Replies
3
Views
1K
Graduate Learning DFT: Inhomogeneous Electron Gas (Hohenberg) Question
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Finding ##\partial^\mu\phi## for a squeezed state in QFT
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Free particle probability distribution
  • · Replies 22 ·
Replies
22
Views
2K
Undergrad States of equal energy are equally probable
  • · Replies 29 ·
Replies
29
Views
2K
Undergrad Diffraction of Matter: Examining Bohr's Theory
  • · Replies 6 ·
Replies
6
Views
2K
High School Is there a fractional frequency of light?
  • · Replies 9 ·
Replies
9
Views
2K
Undergrad Limit of quantum mechanics as h -> 0
  • · Replies 6 ·
Replies
6
Views
2K
Graduate Schrodinger equation in quantum field theory
  • · Replies 8 ·
Replies
8
Views
2K
Undergrad Derivation of two-electron density operator
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Integration of Bessel function products (J_1(x)^2/xdx)
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Angular momentum and rotations
  • · Replies 4 ·
Replies
4
Views
2K
High School Electrons at Absolute Zero -- do they still move?
  • · Replies 11 ·
Replies
11
Views
2K
Graduate Found a new formula of Dirac calculus
  • · Replies 7 ·
Replies
7
Views
1K
Graduate Eigenvalue Problem of Quantum Mechanics
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad The clarity of Heisenberg uncertainty
  • · Replies 18 ·
Replies
18
Views
3K
Undergrad Approach to extrapolate a "superpositioned" wave?
  • · Replies 27 ·
Replies
27
Views
2K
Graduate What is meant when a phase is said to have "symmetry protected"?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Unruh, Haag et al.: No Room for Particles in Quantum Field Theory?
  • · Replies 12 ·
Replies
12
Views
3K
Undergrad How to define expectation value in relativistic quantum mechanics?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Why is quantum mechanics not valid for large objects?
  • · Replies 15 ·
Replies
15
Views
2K
Undergrad Observer effect in the Dual Slit experiment
  • · Replies 6 ·
Replies
6
Views
3K
Undergrad How does EM wave geometrical attenuation affect atomic absorption?
  • · Replies 3 ·
Replies
3
Views
2K
Graduate The eigenvalue power method for quantum problems
  • · Replies 2 ·
Replies
2
Views
2K
High School Quantum Connection vs Entanglement: What's the Difference?
  • · Replies 11 ·
Replies
11
Views
2K
High School What is the difference between a wave and a field?
  • · Replies 13 ·
Replies
13
Views
12K
Undergrad The electron as a smeared charge density
  • · Replies 13 ·
Replies
13
Views
3K
Undergrad Symbol meaning in CP-violating angle
  • · Replies 1 ·
Replies
1
Views
1K
Undergrad Do atoms recoil when emitting a photon?
  • · Replies 38 ·
2
Replies
38
Views
7K
Undergrad How certain is the uncertainty principle?
  • · Replies 10 ·
Replies
10
Views
2K
Graduate Solving the Radial Equation for the Dirac Hydrogen Atom Solution
  • · Replies 10 ·
Replies
10
Views
4K
Undergrad Is Brownian motion a purely classical phenomenon or is it also quantm?
  • · Replies 2 ·
Replies
2
Views
1K
High School Spin And Angular Momentum of Large Objects
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Two hydrogen atoms and Pauli's exclusion principle
  • · Replies 17 ·
Replies
17
Views
3K
Undergrad Understanding tensor product and direct sum
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Can four electrons form a completely antisymmetric joint spin WF？
  • · Replies 16 ·
Replies
16
Views
2K
Graduate Heavy Quark Propagators in HQET
  • · Replies 1 ·
Replies
1
Views
1K
Graduate Scalar decay to one-loop in Yukawa interaction
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Does there exist momentum-shift operator?
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Finite Well Problem: Can Energy Be Equal to V0?
  • · Replies 12 ·
Replies
12
Views
3K
High School Delayed choice experiment and FTL communication
  • · Replies 15 ·
Replies
15
Views
4K
Undergrad Construction of an Entangled Photon Source
  • · Replies 18 ·
Replies
18
Views
5K
Graduate Ballentine on the "multicomponent state function"
  • · Replies 1 ·
Replies
1
Views
2K
Graduate Ballentine on Diffraction Scattering
  • · Replies 4 ·
Replies
4
Views
2K
Undergrad A very basic question about bra-kets
  • · Replies 10 ·
Replies
10
Views
2K
Undergrad Parameter Integration of Bubble Integral
  • · Replies 2 ·
Replies
2
Views
1K
Undergrad Velocity operator, its expression and eigenvalues
  • · Replies 27 ·
Replies
27
Views
4K
Graduate Understanding time translations in Ballentine
  • · Replies 2 ·
Replies
2
Views
1K