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 What is the External Field Approximation in Quantum Mechanics?
- Miquelyn10
- · Replies 4 ·
A good video on the history of quantum physics
- Forestman
- · Replies 3 ·
Graduate Energy Dependence of Scattering Phase Shifts
- FunkyDwarf
- · Replies 1 ·
Graduate Is scientific knowledge ultimately limited
- himanshu2004@
- · Replies 9 ·
Undergrad Can we directly measure something without changing it?
- KingNothing
- · Replies 5 ·
Undergrad Basic question regarding point of view
- ketamynx
- · Replies 2 ·
High School Double Slit Experiment: Red Laser vs Green Laser
- dalcde
- · Replies 2 ·
Graduate The range of (psi) squared is ?
- peeyush_ali
- · Replies 7 ·
Graduate Virtual Particles And Hidden Dimensions
- mjacobsca
- · Replies 4 ·
Graduate Do Lagrangian and hidden symm broken Lagr describe the same physics?
- ndung200790
- · Replies 3 ·
Graduate Fatal error in computer simulation (photoelectric)
- worlov
- · Replies 11 ·
Graduate Hilbert Spaces And Quantum Mechanics
- schumi1991`
- · Replies 13 ·
Graduate Energy operator in curved space-time
- jfy4
- · Replies 7 ·
Graduate What is the significance of 2S+1 in understanding bosons and fermions?
- erok81
- · Replies 3 ·
Graduate Time dependent perturbation theory for density matrix
- paweld
- · Replies 1 ·
Graduate Why Do We Assume Ultraviolet Divergences are Physical
- maverick_starstrider
- · Replies 5 ·
Undergrad Need in depth understanding of Simple physic terms
- jcmartinez
- · Replies 1 ·
High School Scattering of light on objects
- philsmiley
- · Replies 1 ·
Graduate Why is j=0 to j'=0 forbidden by the parity rule if spin orbit interaction
- blueyellow
- · Replies 2 ·
Graduate Is photon a basic unit of information?
- morg
- · Replies 14 ·
Graduate Why Do Symmetry Breakings Differ with the Same Classical Lagrangian?
- ndung200790
- · Replies 13 ·
Graduate Difference between Fermions and Bosons in Feynman diagrams
- vcdfrexzaswq
- · Replies 5 ·
Graduate Delayed choice quantum eraser: does observation affect reality?
- medman1234
- · Replies 2 ·
Graduate Local hidden variables with more than two electron spin outcomes
- mach567
- · Replies 70 ·
Graduate Absolute Zero - No Entropy -Quantum Jiggles?
- Quantum Bum
- · Replies 8 ·
Graduate Expectation value of vector potential in number states
- kof9595995
- · Replies 12 ·
Graduate Simple gamma matrices question
- Ameno
- · Replies 4 ·
Graduate Fermi energy (density of electron)
- royayash
- · Replies 1 ·
Graduate Virtual particles are not matter-antimatter, is it?
- Edi
- · Replies 16 ·
Graduate Why Represent the Photon Field with Four Potentials Instead of E and B Fields?
- captain
- · Replies 3 ·
Graduate What is a structured reservoir in decay and Markov approximation?
- Carnot
- · Replies 1 ·
Graduate Quantum fluctuations and space
- Schreiberdk
- · Replies 2 ·
Graduate Why do fermions have antisymmetric wave functions and bosons symmetric ones?
- exponent137
- · Replies 8 ·
Explain Bell's experiment in simple terms
- MEMoirist
- · Replies 16 ·
Graduate What properties of Bose-Einstein condensates allow them to slow light?
- the riddick25
- · Replies 1 ·
Graduate Measurements corresponding to Exchange Operator
- Jolb
- · Replies 9 ·
Graduate Representing a wavefunction using bases
- Shaybay92
- · Replies 7 ·
Graduate Uncertainty Principle question
- stockr21
- · Replies 4 ·
Graduate Note to the derivation of Dirac equation
- exponent137
- · Replies 3 ·
Graduate What is the role of the spin variable in quantum chemistry?
- Amok
- · Replies 3 ·
Graduate Coherent electrons in double slit experiment?
- kof9595995
- · Replies 4 ·
Graduate Is wave-function collapse a REAL incident
- Soumya_M
- · Replies 38 ·
Graduate Gamma matrices projection operator
- choongstring
- · Replies 1 ·
Graduate How does parity affect particle exchange in para- and ortho-hydrogen?
- Rudipoo
- · Replies 2 ·
Graduate (in)coherent superposition and quantum erasure
- Ameno
- · Replies 6 ·
High School Are photons packets of electronic waves such as this below
- stevmg
- · Replies 5 ·
Graduate Substates don't evolve according to Schroedinger equation?
- rodsika
- · Replies 2 ·
Undergrad Why use momentum instead of velocity in classical mechanics
- SUDOnym
- · Replies 1 ·
Graduate Where Can I Find Hamiltonians of the Standard Model in QFT?
- metroplex021
- · Replies 2 ·
Graduate Does photon loose energy/mass during travel?
- San K
- · Replies 1 ·
Graduate Conceptual question on measuring momentum of a particle
- SUDOnym
- · Replies 1 ·
Graduate Schrödinger equation with spin term
- Gavroy
- · Replies 1 ·
Graduate What is scattering by a potential and how does it affect a passing particle?
- Shaybay92
- · Replies 5 ·
Graduate How is quantum teleportation achieved through quantum entanglement?
- iRaid
- · Replies 6 ·
Graduate Can quantum teleportation ever transport humans?
- touqra
- · Replies 12 ·
Graduate Can We Influence the Spin of Entangled Photons?
- San K
- · Replies 1 ·
Graduate Transition: Classical Mechanics to Quantum Mechanics
- go quantum!
- · Replies 2 ·
Graduate End of Uncertainty: Quantum Mechanics in Human Perspective
- CyberShot
- · Replies 7 ·
Graduate Generalized group for quantum mechanics
- jfy4
- · Replies 2 ·
Graduate How Many Photons in a Light Wave
- peter.ell
- · Replies 3 ·
Graduate What is a application of linear sigma model?
- ndung200790
- · Replies 5 ·
Graduate Wavefunction of a single particle
- venton
- · Replies 10 ·
Graduate Would like professional advice on a sci fi story.
- Brad12d3
- · Replies 7 ·
Graduate Does Exponential Decay Fail at the Quantum Level?
- aftershock
- · Replies 4 ·
Graduate Electron photographed for the first time
- luckis11
- · Replies 7 ·
Graduate Double-Slit Experiment: Detection Without Destruction?
- eloheim
- · Replies 5 ·
Graduate What is the significance of the infinite square well width in quantum mechanics?
- Miquelyn10
- · Replies 4 ·
Graduate What does this bra-ket notation tell you about the system?
- JDude13
- · Replies 5 ·
Graduate Perturbation Theory: Calculating 2nd Approx of E in Hydrogen 2s State
- Gavroy
- · Replies 5 ·
Graduate How can particles undergo EM interactions *and* have definite strong isospin?
- depeche1
- · Replies 3 ·
Graduate Definition of 'good quantum number' after parity violation
- metroplex021
- · Replies 2 ·
Graduate Validity of Derivations of Schrödinger's Equation
- ObsessiveMathsFreak
- · Replies 13 ·
Graduate Does the Born Rule conflict with determinism in quantum mechanics?
- rodsika
- · Replies 29 ·
Graduate How to Grasp Quantum Mechanics and Hydrogen Models as a Physics Student?
- chenesai
- · Replies 4 ·
Graduate Any result that conflicts with the below theory of entanglement?
- San K
- · Replies 4 ·
Graduate Where Do Photons Come From and How Do They Embrace Wave-Particle Duality?
- Hooloovoo
- · Replies 10 ·
Graduate How does a wave function collapse?
- metalminded
- · Replies 8 ·
Graduate Quantum approach to latent heat
- Bassalisk
- · Replies 4 ·
Graduate Path integral formulation of non-relativistic quantum mechanics
- go quantum!
- · Replies 2 ·
Graduate Uncertainty principle with/out detectors
- hollowsolid
- · Replies 2 ·
Graduate Why Is the LSZ Formula Overlooked in Some QFT Texts?
- Lapidus
- · Replies 7 ·
Graduate What's wrong with this FTL experiment?
- San K
- · Replies 19 ·
Graduate Why is there no constant magnetic dipole-dipole interaction?
- Gavroy
- · Replies 4 ·
Graduate Understanding Destructive Interference in Electron Wave Functions
- jalebi
- · Replies 6 ·
Graduate Feynman rules (vertecies) for graviton
- Neitrino
- · Replies 7 ·
Graduate Why does Franck-Hertz experiment show only 4.9V transitions?
- bentzy
- · Replies 12 ·
Graduate When Were Anomalous Correlations in Entangled Photons First Observed?
- jed clampett
- · Replies 2 ·
Graduate Bohr Model Postulates: Understand Discrete Angular Momentum Orbits
- Bassalisk
- · Replies 2 ·
Graduate Why the minima of potential of classical Lagrangian called ''vacuum expectation''?
- ndung200790
- · Replies 3 ·
Graduate Why do photoelectrons have a range of kinetic energies?
- PhysJs
- · Replies 7 ·
Graduate QM Definition of Center of Mass
- LarryS
- · Replies 5 ·
Graduate Bell tests: Singlet vs Triplet State
- jed clampett
- · Replies 2 ·
Graduate Finite-Temperature Schrödinger's equation
- Gavroy
- · Replies 4 ·
Graduate Time Independent Schrödinger equation.
- MixedHerbs
- · Replies 6 ·
Graduate Decoherence, Coherence, Pure State, Mixed State
- rodsika
- · Replies 44 ·
Graduate About Gauge invariance - again
- izh-21251
- · Replies 7 ·
Graduate Uncertainty Principle and Particle Calculation in the Past
- Nervous
- · Replies 1 ·
Graduate Why are energy eigenstates considered wavefunctions in quantum mechanics?
- jeebs
- · Replies 7 ·
Graduate Where do the extra particles go
- edguy99
- · Replies 4 ·
Graduate Non-Perturbative QFT without Virtual Particles
- rogerl
- · Replies 103 ·