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.
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Graduate Pseudoparticle Operators: Fermion or Boson?
- Gregory Gao
- · Replies 1 ·
Graduate Is the expectation value of momentum always zero for real wavefunctions?
- dyn
- · Replies 1 ·
Graduate About diagonal element of dipole
- KFC
- · Replies 10 ·
Graduate Effect of different atom on Compton Shift?
- Seydlitz
- · Replies 2 ·
Graduate Most probable electron location in Hydrogen ground state
- jaydnul
- · Replies 20 ·
Graduate Does Quantum Precession Contradict Traditional Spin Directions?
- Jimmy87
- · Replies 14 ·
Graduate Frank-Condon Principle - Potential Energy Surfaces
- elemis
- · Replies 3 ·
Graduate How Do Physicists Know That Quantum Superposition Does Exist?
- pink laser
- · Replies 18 ·
Graduate Why Is the Wave Function Often Expressed as Psi = Cos(kr - wt) + i Sin(kr - wt)?
- AL-Hassan Naser
- · Replies 6 ·
Graduate Heisenberg's Matrix Mechanics: An Understanding Review
- Pollock
- · Replies 3 ·
Graduate Vector under Chiral transformation
- PhyAmateur
- · Replies 1 ·
Graduate How Can a Hot, Vibrating Universe Remain Homogeneous?
- acesuv
- · Replies 1 ·
Graduate Action corresponding to photon emission
- semc
- · Replies 1 ·
Graduate Why Does an Operator in Quantum Mechanics Transform into a Matrix?
- Jdraper
- · Replies 3 ·
Graduate Does electron has definite path?
- Godparicle
- · Replies 37 ·
Graduate Superposition and retrocausality
- Matush
- · Replies 20 ·
Undergrad Does every moving particle have a de Broglie wavelength?
- gracy
- · Replies 11 ·
Graduate A Gedanken Experiment Regarding Bell's Theorem and Nonlocality
- Gary Boothe
- · Replies 1 ·
Graduate Singlet and Triplet Terms misunderstanding
- Eats Dirt
- · Replies 2 ·
Undergrad Double Slit Experiment and it's Results ?
- kirsten_2009
- · Replies 2 ·
Graduate Who first theoretically determined the photon's spin value of 1
- jjustinn
- · Replies 16 ·
Graduate The No Cloning theorem vs weak measurement
- Checkster2323
- · Replies 5 ·
Undergrad Why does hydrogen gas absorb energy to excite electrons if it then emits photons?
- gracy
- · Replies 3 ·
Graduate [QM] Conservation probability to degenerate eigenvalues
- Saverio
- · Replies 3 ·
Graduate Localizing a high energy particle with momentum eigenstate superposition
- Spinnor
- · Replies 1 ·
Graduate Associated Legendre differential equation involved in solving spin function?
- bearcharge
- · Replies 2 ·
Graduate How do commutators derive the SO(2,1) Lie algebra from generators?
- askalot
- · Replies 3 ·
Graduate About the photon carrying the electromagnetic forces
- tonyxon22
- · Replies 3 ·
Graduate Wheeler-DeWitt and timelessness
- nomadreid
- · Replies 11 ·
Graduate Polarization, Bell, and spin of photons
- jk22
- · Replies 6 ·
Graduate Entangled Particles and the Hadron Collider?
- KooperScooper
- · Replies 8 ·
Graduate Do fermionic operators on different subsystems commute?
- gonadas91
- · Replies 17 ·
Graduate Spin 1 Particle Representations of SO(3) and SU(2)
- LarryS
- · Replies 4 ·
Graduate Quantum scattering theory (lab frame, center of mass frame)
- moriheru
- · Replies 10 ·
Graduate Why weak values can exceed the eigenvalue range of A
- msumm21
- · Replies 2 ·
Graduate Dissipation in quantum mechanics
- hokhani
- · Replies 1 ·
Graduate Description of the Electron Degeneracy Principle
- realPhysics49
- · Replies 1 ·
Graduate What is the energy of a particle
- jaydnul
- · Replies 3 ·
Graduate Finding solutions for combined 1D potentials with scattering states
- morve
- · Replies 1 ·
Graduate Current of Complex scalar field
- PhyAmateur
- · Replies 2 ·
Graduate Why is the integration range 2π to 0 in renormalization?
- moriheru
- · Replies 2 ·
Graduate Solve Gauge Equiv. of Chern-Simons Action EOM
- Maybe_Memorie
- · Replies 1 ·
Graduate Lower bounds on energy eigenvalues
- jfy4
- · Replies 3 ·
High School Why does excess neutrons over protons make a nucleus unstable?
- Fabian901
- · Replies 5 ·
Graduate What Constitutes a Quantum Measurement in Liquid Helium Experiments?
- muppet
- · Replies 2 ·
Graduate What is the definition of future according to quantum mechanics?
- amrani
- · Replies 15 ·
Graduate Spectrum of the Reduced matrix's eigenvalues
- fpaolini
- · Replies 1 ·
Graduate How can I compute translation invariance for p in a one dimension wave function?
- MickaelPC
- · Replies 2 ·
Graduate Calculating Expectation Value of Momentum with Fourier Transform
- rwooduk
- · Replies 2 ·
Graduate In QM, can the trajectory in the phase-space split?
- ORF
- · Replies 7 ·
Graduate Commuting operators require simultaneous eigenfunctions?
- kmm
- · Replies 25 ·
Graduate What causes the weak interaction and what is its range?
- mokeejoe5
- · Replies 3 ·
Graduate Can quantum indeterminacy affect macroscopic objects like falling stones?
- Nick O
- · Replies 5 ·
Graduate Can Singlet Spin Pairs Behave Like Bosons?
- anorlunda
- · Replies 3 ·
Graduate Can Wave Function Constants Be Both Positive and Negative?
- terp.asessed
- · Replies 5 ·
Graduate Photonic density of state in matter
- Jeffrey Yang
- · Replies 2 ·
Graduate How Does a Wave Packet Represent a Free Particle in Quantum Mechanics?
- Waxterzz
- · Replies 19 ·
Graduate Quantum Teleportation - Misconceptions and QM fundamentals
- Goodies1
- · Replies 5 ·
Graduate Proving an identity and some interesting maths stuff
- gentsagree
- · Replies 1 ·
Graduate Renormalisation of the Schrodinger equation
- spaghetti3451
- · Replies 6 ·
Graduate Information from the correlations
- naima
- · Replies 1 ·
Graduate SU(3)-invariant Heisenberg XXX chain
- Maybe_Memorie
- · Replies 1 ·
Graduate Why do particle beam relative velocities have consistent dimensions in this formula?
- guest1234
- · Replies 2 ·
Graduate How do combination bands appear in vibrational spectra?
- Talita
- · Replies 1 ·
Graduate Photon entanglement in type II spontaneous parametric down conversion
- Clovis
- · Replies 7 ·
Graduate Is Planck's Law Based on Incorrect Assumptions About Boltzmann's Distribution?
- Luck0
- · Replies 9 ·
Graduate Quantum objects and Electromagnetic waves
- aditya ver.2.0
- · Replies 13 ·
Graduate Should the Normalization Constant be Positive or Complex?
- kmm
- · Replies 6 ·
Graduate Is perturbation theory necessary for constructing quantum field theories?
- the_pulp
- · Replies 28 ·
Graduate Quantum Mechanics Prior To The Big Bang
- Dryson
- · Replies 7 ·
Graduate What is reality according to quantum mechanics?
- Warpspeed13
- · Replies 7 ·
Graduate Exchange symmetry when adding angular momentum and in LS coupling?
- CrimsonFlash
- · Replies 3 ·
Undergrad Electron transition notation should be simple
- elegysix
- · Replies 2 ·
Graduate What does visibility mean in quantum interference?
- suma
- · Replies 3 ·
Graduate Two slit electron diffraction / observer
- Goodver
- · Replies 1 ·
Graduate Why does N fluctuate if the number operator commutes with the Hamiltonian?
- Xemnas92
- · Replies 38 ·
Graduate Representing a bilinear functional as an inner product in Merzbacher 9.8
- tigigi
- · Replies 1 ·
Graduate Advice for first time studying Quantum Mechanics ?
- Ibrahim Hany
- · Replies 6 ·
Graduate When is |x|^μ in L2(-1,1) and how to learn Lebesgue spaces?
- tigigi
- · Replies 2 ·
Graduate Evaluating Integrals of Exponential Functions with Dirac Delta
- Dixanadu
- · Replies 7 ·
Graduate Quantum Imaging with Undetected Photons arXiv:1401.4318(quant phy)
- Dadface
- · Replies 8 ·
Graduate Can there be non-trivial IR fixed points in asymptotically free theories?
- geoduck
- · Replies 1 ·
Undergrad What are Einstein's 3 postulates for Photo electric effect?
- uzman1243
- · Replies 2 ·
Graduate Hidden variable theories and Bell's theorem assumptions
- miosim
- · Replies 53 ·
Graduate SU(2): Get RHS from LHS of Expression
- intervoxel
- · Replies 2 ·
Graduate Nested Schrödinger's cat boxes with a hammer chain
- moriheru
- · Replies 20 ·
Graduate How do you know the change in ml for a transition?
- Jt00
- · Replies 1 ·
Graduate Analytical solution for bound state energies of infinite well
- Bob007
- · Replies 2 ·
Undergrad Light remaining in a perfectly reflecting room after removal
- doanr
- · Replies 1 ·
Graduate Fermi's Golden Rule Density of States
- I<3NickTesla
- · Replies 3 ·
Graduate Emuberable and Demumerable sets
- sweet springs
- · Replies 8 ·
Graduate Why does Dirac set m = 0.5ℏa for angular momentum magnitude 0.5ℏ?
- jamie.j1989
- · Replies 4 ·
Graduate Efficiency of non-linear optical device
- zhanhai
- · Replies 3 ·
Graduate Proving the Isomorphism Property of the Spinor Map in SL(2,C) and SO(3,1)
- gentsagree
- · Replies 2 ·
Graduate The simplest derivation of position operator for momentum space
- cryptist
- · Replies 6 ·
Graduate Understanding Scattering and Bound State Solutions in Quantum Mechanics
- Logan Rudd
- · Replies 1 ·
Graduate How Should I Think About the Dirac Equation
- bolbteppa
- · Replies 13 ·
Graduate Experimental Support of Shrodinger Equation
- Hertz
- · Replies 12 ·
Graduate Divergence of the Stress-Energy Tensor
- Paddyod1509
- · Replies 4 ·
Graduate RQM vs QM ( relativistic quantum mechanics vs quantum mechanics)
- moriheru
- · Replies 8 ·