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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Undergrad Can photons have mass?
- medgalis
- · Replies 11 ·
Graduate Excitation of electrons in atoms
- deadscientist
- · Replies 2 ·
Graduate Why are QM wave functions complex?
- IAN 25
- · Replies 38 ·
High School Can someone explain degeneracy pressure in simple terms?
- Kulu
- · Replies 4 ·
Graduate Should the speed of light be slightly uncertain?
- g.lemaitre
- · Replies 30 ·
Graduate Why are spinors associated with isotropic vectors if spin has length?
- copernicus1
- · Replies 10 ·
Graduate Paraparticles and Parastatistics
- yossell
- · Replies 6 ·
Graduate When is classical mechanics valid for describing motion of atoms?
- Arham
- · Replies 2 ·
Graduate 9j symbol expansion in 6j symbols
- Yoran91
- · Replies 4 ·
Graduate Is [x,p]=i quantum mechanical?
- geoduck
- · Replies 1 ·
Graduate Mistake in proof regarding degeneracy property
- HJ Farnsworth
- · Replies 2 ·
Graduate Energy of interacting particle and time evolution of p(x)
- jshrager
- · Replies 1 ·
Graduate Why does a deuteron nucleus have spin 1? Hydrogen spin 1/2?
- pa5tabear
- · Replies 8 ·
Graduate What is the quantum mechanics descriptions for a plasma radiation
- xhtp2000
- · Replies 1 ·
Graduate Quantum entanglement (information transmitted )
- shumy
- · Replies 4 ·
Graduate Photon interacting with 1D-boundary
- SpinFollower
- · Replies 2 ·
Graduate Selection rules for atomic transitions
- copernicus1
- · Replies 3 ·
Graduate Is the Transmission Probability of a Vertically Polarized Photon Really 1.0?
- Alfred Cann
- · Replies 7 ·
High School Does light energy decrease with each reflection?
- K Raja Sharma
- · Replies 1 ·
Graduate Solutions of the schrödinger eq. for a potential step
- 71GA
- · Replies 8 ·
Graduate Schrodinger equation subjected to general potential
- ace1719
- · Replies 1 ·
Graduate Why is the concept of a one dimensional box used?
- pa5tabear
- · Replies 4 ·
Graduate Is There a Metric Tensor in Hilbert Space That Transforms Vectors to Duals?
- snoopies622
- · Replies 14 ·
Graduate Changing variables in the Schrodinger equation
- AxiomOfChoice
- · Replies 1 ·
Graduate Does a coordinate transformation with unit Jacobian leave the action unchanged?
- geoduck
- · Replies 2 ·
Graduate Dark state in coherent population trapping and electromagnetically induced transparency
- Mahdimatika
- · Replies 5 ·
Graduate Does spin measurement yield discrete values or continuous outcomes?
- andrewkirk
- · Replies 2 ·
Graduate How does a collider know both the energy and position of the particle?
- jshrager
- · Replies 2 ·
Graduate Are macroscopic objects self-collapsing ?
- jshrager
- · Replies 2 ·
High School Why Do Electrons Closer to the Nucleus Have Lower Energy?
- waterliyl
- · Replies 3 ·
Graduate Commutator with Tensor Notation
- Septim
- · Replies 11 ·
Graduate Orbital angular momentum and powers of k
- Einj
- · Replies 4 ·
Graduate Quantum amplitudes versus probability
- spaghetti3451
- · Replies 14 ·
Graduate Expectation values for Hydrogen
- TheRascalKing
- · Replies 2 ·
Graduate Does erasing which-path data after recording restore interference patterns?
- najibmok
- · Replies 19 ·
Graduate Book or notes for 'Quantum Field Theory II' by Francois David (PSI)
- center o bass
- · Replies 1 ·
Graduate Problems with photoelectric effect lab
- evangoor
- · Replies 2 ·
Graduate Why is the Matrix Exponential Related to the Hamiltonian in QM?
- Infrared
- · Replies 9 ·
Graduate What do position and momentum operators return when applied to a wavefunction?
- santo35
- · Replies 3 ·
Graduate General Entanglement and Measurement
- Vinncent
- · Replies 3 ·
Graduate Amplitude's time dependence in Heisenberg representation
- LayMuon
- · Replies 1 ·
Graduate Energies and numbers of bound states in finite potential well
- 71GA
- · Replies 2 ·
Graduate Valid reason to reject the Bohr model?
- tade
- · Replies 9 ·
Undergrad History of Planck's equation(s)
- tade
- · Replies 16 ·
Graduate Is There Room for Interpretation in Quantum Mechanics?
- alexepascual
- · Replies 9 ·
Graduate Quantum Scale, Statistical Physics
- M. next
- · Replies 1 ·
Graduate Operators and the position representation
- tom.fay
- · Replies 2 ·
Graduate Does photon lose its momentum?
- 2sin54
- · Replies 5 ·
Graduate Can one speak of the wave function of a object measured?
- nomadreid
- · Replies 2 ·
Undergrad Explanation behind Moseley's Law?
- tade
- · Replies 3 ·
Graduate Interference in Quantum Mechanics (Basic)
- enceladus_
- · Replies 21 ·
Graduate Plotting a wavefunction for a finite potential well doesn't work out
- 71GA
- · Replies 2 ·
Graduate Solving the Hydrogen Molecule computationally
- dipole
- · Replies 2 ·
Graduate Energy levels for a 3D cubical box
- cytochrome
- · Replies 4 ·
High School Electron is it a particle or wave ?
- Ahmed_Pysics
- · Replies 26 ·
Graduate What is the use of WKB after Schrodinger equation is established?
- wdlang
- · Replies 1 ·
Graduate Dirac eq gamma matrices question
- copernicus1
- · Replies 4 ·
Graduate Is every state an eigenstate of an observable?
- atyy
- · Replies 27 ·
Graduate Schrodinger equation for close and opens system
- brajeshbeec
- · Replies 4 ·
Graduate Why does Schrödinger's cat seem to make common sense?
- capcom1983
- · Replies 19 ·
Graduate Entanglement at cosmic distances possible?
- ealbers
- · Replies 1 ·
Graduate How can bosons made of fermions occupy the same quantum state?
- andrewkirk
- · Replies 7 ·
Undergrad Stimulated Emission: Understanding Its Changing Rate
- BareFootKing
- · Replies 4 ·
Graduate Why can a quantum particle exist where its total energy is less than the potential?
- LagrangeEuler
- · Replies 2 ·
Graduate Problems with a Charged Particle in a Magnetic Field
- phi1123
- · Replies 5 ·
Graduate When is the WKB approximation valid mathematically?
- metalrose
- · Replies 8 ·
High School How can a photon move something( light moves), if it doesn't have a ma
- silvercats
- · Replies 12 ·
Graduate Fourier transform of integration measure (Peskin and Schroeder)
- center o bass
- · Replies 1 ·
Graduate Splitting up of functional integral (Peskin and Schroeder)
- center o bass
- · Replies 2 ·
Graduate Understanding Virtual Particles: An Introduction to the Concept and Properties
- Quantumsatire
- · Replies 3 ·
Graduate Double slit questions from an observation perspective
- GOD__AM
- · Replies 4 ·
Graduate Z-direction. Quantisation axis
- LagrangeEuler
- · Replies 1 ·
Graduate Decoherence And What happens in reality
- the_pulp
- · Replies 5 ·
Graduate What causes faraday effect quantum mechanically?
- Jerrynap
- · Replies 1 ·
Graduate Calculating Electric Fields for H Atom Ionization with SFA
- ENDLESSYOU
- · Replies 1 ·
Undergrad What exactly happens when an electron gains energy?
- Tuvshee
- · Replies 4 ·
Graduate Correspondence principle for a step potential
- bcrowell
- · Replies 6 ·
Graduate Are all electrons manifestations of a single universal wave?
- john.spidey
- · Replies 2 ·
Graduate Can SSB Be Visually Understood? Ideas for Intuitive Explanations
- LayMuon
- · Replies 1 ·
Graduate Circular Interference Patterns in Multi-Slot Experiments
- ratchettrack
- · Replies 2 ·
Graduate When to use Slater determinant vs permanent for symmetry?
- M. next
- · Replies 2 ·
Graduate Equilibrium bond lengths for excited molecules
- Woodles
- · Replies 1 ·
Graduate How do you quantumly entangle particles?
- tinypositrons
- · Replies 27 ·
Graduate What is the physical significance of having +/- a constant multiplying
- Whistlekins
- · Replies 1 ·
Graduate What is δ₁ in Sakurai equation 1.4.9?
- omoplata
- · Replies 7 ·
Graduate Commutativity of the Born Rule
- the_pulp
- · Replies 50 ·
Graduate Trouble with Wick rotation in 1+1d abelian Higgs model
- rgoerke
- · Replies 5 ·
Undergrad Energy Equvalant of different masses
- ratchettrack
- · Replies 3 ·
Graduate Understanding Electromagnetic Transitions: |ΔI|=1, ΔIz=0
- LayMuon
- · Replies 4 ·
Graduate What is so 'counter-intuitive' about the double-slit experiment?
- mintparasol
- · Replies 12 ·
Graduate Interaction tetween two waves soliton
- alejandrito29
- · Replies 1 ·
Graduate How was the Taylor expansion for SSB in superconductors done?
- LayMuon
- · Replies 6 ·
Graduate Quantum Eraser Experiment: Fact or Fiction?
- g.lemaitre
- · Replies 3 ·
Undergrad Hydrogen Atoms and Spectral Lines
- PhyHunter
- · Replies 4 ·
Graduate Is Quantum Mechanics saying we've already existed and will again?
- Seminole Boy
- · Replies 2 ·
Graduate Finite Potential Well Solutions
- 71GA
- · Replies 1 ·
Graduate Can an Electron Be a Frame of Reference in Quantum Mechanics?
- orthogonal
- · Replies 6 ·
Graduate Is a wave function as complete as can be
- Roodles01
- · Replies 2 ·
Graduate Deriving WKB transmission and reflection coefficients
- pleasehelpmeno
- · Replies 2 ·
Graduate Why Does the Lone Electron in Silver Have Zero Orbital Angular Momentum?
- ENDLESSYOU
- · Replies 2 ·