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 Heisenbergs Uncertainty for light
- duffbeerforme
- · Replies 3 ·
Graduate Understand Uncertainty Principle in a Week
- bassplayer142
- · Replies 35 ·
Graduate Why do mirror positions affect all photons in a half-silvered mirror setup?
- Habeed
- · Replies 9 ·
Graduate Beginner to Braket State Vectors
- Domnu
- · Replies 12 ·
Graduate Factorizing a spin-orbit interaction matrix as a product of rotations
- AA1983
- · Replies 2 ·
Graduate Can an object at rest violate the uncertainty principle?
- chrisphd
- · Replies 38 ·
Graduate Dopler Shift and Photon Number
- cmos
- · Replies 5 ·
Graduate Why does exchange energy depend on spin in perturbation theory but not in Hartree-Fock?
- njuxyh
- · Replies 1 ·
Undergrad Difference between eigenfunctions and eigenstates in quantum mechanics
- Domnu
- · Replies 6 ·
Graduate Propagator/transition amplitude through intermediate integrations
- omg!
- · Replies 5 ·
Graduate Can E and B Be Eigenfunctions of a Differential Operator?
- Ray
- · Replies 7 ·
Graduate Understanding Renormalization in Quantum Mechanics: Examples and Context
- ObsessiveMathsFreak
- · Replies 6 ·
Graduate Frequency: What is it? Questions about Frequency, Doppler Effect and Mass
- okkvlt
- · Replies 3 ·
Graduate Ladder Operator/hermiticity
- GAGS
- · Replies 5 ·
Graduate What are the Consequences of Varying Planck's Constant?
- a.a
- · Replies 20 ·
Graduate Why doesn't the wave function change when φ increases by 2π?
- m-i-t-o
- · Replies 2 ·
Graduate How abou the hidden variable theory?
- xylai
- · Replies 2 ·
Graduate What is the weak field tensor W^μν and can it be written as a matrix?
- Ben1729
- · Replies 2 ·
Undergrad Tunneling through a PE barrier
- kalery
- · Replies 3 ·
Finding the complete "And God Said" equation from a postcard
- Redmonkiee
- · Replies 2 ·
Graduate How to prove Coleman's formula for the ratio of two determinants?
- omg!
- · Replies 7 ·
Graduate Double slit electron experiment
- George5
- · Replies 10 ·
Graduate What is the meaning of the lower case i in the Schrodinger equation?
- bluestar
- · Replies 9 ·
Graduate QM calculation of vacuum energy
- battery
- · Replies 3 ·
Graduate What Causes Quantum Foam to Form at a Sub-Planck Level?
- artkin76
- · Replies 2 ·
Undergrad Let's get it right about Electron Waves
- rohanprabhu
- · Replies 10 ·
Graduate The magnetic field in Stern-Gerlach
- Chen
- · Replies 6 ·
Graduate Myth 4: The only reality is measured reality
- pellman
- · Replies 69 ·
Graduate Why did Schrodinger call his equation eigenvalue problem?
- kahoomann
- · Replies 2 ·
Graduate Calculating Time Evolution of Density Matrix
- dg88
- · Replies 1 ·
Graduate How does quantum entanglement work and why does it happen?
- hadeka
- · Replies 9 ·
Graduate Temperature and quantum physics
- student85
- · Replies 6 ·
Which Dirac book discusses non-local hidden variables and nonlinearity?
- xylai
- · Replies 3 ·
High School Why doesn't red light damage photographic film in darkrooms?
- a.a
- · Replies 3 ·
Graduate Stern Gerlach Gradient Field Strength
- rwhitman
- · Replies 1 ·
Graduate Psi^4 Theory: A Fermion with Quartic Self-Interaction
- jdstokes
- · Replies 1 ·
Graduate Question on quadratic fluctuations in the path integral formalism
- omg!
- · Replies 1 ·
Graduate FTL Communication-Best Candidate?
- MonstersFromTheId
- · Replies 21 ·
Graduate Natural Eigenbasis composite 2 X Spin 1/2 system
- cathalcummins
- · Replies 6 ·
Graduate Physical meaning of Pauli matrices and why electron spin has no classical analogue
- GAGS
- · Replies 4 ·
Undergrad Why ultraviolet light kills skin cells but infrared light only warms them
- a.a
- · Replies 8 ·
Graduate Particle in Two Boxes: Impact of Dividing Barrier on Energy State
- chrisphd
- · Replies 2 ·
Graduate Classical -> Quantum Generator of Translation
- Bork
- · Replies 5 ·
Graduate What Is The Origination Of Zero Point Energy
- GAGS
- · Replies 1 ·
Graduate Planning a 15-minute quantum mechanics presentation for physics 3
- ΔxΔp≥ћ/2
- · Replies 53 ·
Graduate What is the justification for the substitution p_x -> (h/i)d/dx in physics?
- gn0m0n
- · Replies 3 ·
Graduate Quantum Mechanics: Fundamental Question
- Domnu
- · Replies 2 ·
Graduate How Are the Coefficients of a Qubit's Density Matrix Constrained?
- Dragonfall
- · Replies 17 ·
Graduate What is the Operator for Spin-3/2 Rotation in Fermion Fields?
- tmc
- · Replies 6 ·
Graduate How do virtual particles mediate forces and relate to fields?
- GRB 080319B
- · Replies 1 ·
Graduate A practical application of quantum mechanics
- Raina
- · Replies 5 ·
Graduate What is the Force of Radiation Resistance?
- arhanbezbora
- · Replies 2 ·
Graduate Time scale of photon absorption in electron
- I_wonder
- · Replies 1 ·
Graduate Quantum Physics, when is spin-orbit coupling necessary?
- Antti
- · Replies 1 ·
Graduate Effect preceding cause in a quantum interferometer thought experiment
- Robert Noel
- · Replies 69 ·
Graduate Wavefunction collapse => increase in entropy?
- 2Tesla
- · Replies 14 ·
Graduate Conditions for a Hamiltonian to have non-degenerate eigenvalues
- omg!
- · Replies 16 ·
Undergrad Energy levels in a potential well
- physmile
- · Replies 3 ·
Graduate Does virtual pair splitting at the event horizon explain Hawking radiation?
- Chaos' lil bro Order
- · Replies 18 ·
Graduate Wave-particle duality/double slit experiment
- francirp
- · Replies 28 ·
Graduate Can Maxwell's equations describe a single photon?
- Usaf Moji
- · Replies 7 ·
Graduate Why do photons and electrons show both wave and particle properties?
- SpaceExplorer
- · Replies 7 ·
Graduate Is Angular Momentum Conserved in EPR Pair Measurements?
- lark
- · Replies 16 ·
Graduate Can every attractive 1D potential have at least one bound state?
- luisgml_2000
- · Replies 4 ·
Graduate Why permeability equal to unity?
- iLIKEstuff
- · Replies 1 ·
Graduate The phase velocity of laser light
- redtree
- · Replies 2 ·
Graduate What Defines Quantum Chaos in Experiments?
- xylai
- · Replies 2 ·
Graduate Simple example of the collapse of the wavefunction?
- Ulysees
- · Replies 41 ·
Graduate Did Exponential Expansion Trigger Early Spontaneous Symmetry Breaking?
- bogie
- · Replies 1 ·
Graduate Do Planck units combine additively?
- Dropout
- · Replies 16 ·
Graduate Quantum mechanics violation in sky observations
- SF
- · Replies 13 ·
Graduate Free Particle Wavepacket Spreading: Is it True?
- Adeimantus
- · Replies 8 ·
Graduate Particle in an infinite potential well, showing the uncertainty in x
- SuperNomad
- · Replies 4 ·
Graduate Understanding Time-Dependent Probability in Quantum Mechanics
- Irid
- · Replies 3 ·
Graduate About Schrodinger eq. and the potential step case with E = V0
- Tavo
- · Replies 6 ·
Graduate Complex Conjugate of Fourier Transform
- Epoch12000BC
- · Replies 3 ·
Graduate Degrees of Freedom of an electron
- Neitrino
- · Replies 3 ·
Graduate Boltzmann Factor in QM Language
- andrewm
- · Replies 3 ·
Graduate How Do I Work Out the Anti-Commutation Relations in QFT? (Srednicki)
- trinitron
- · Replies 14 ·
Graduate When can we ignore the delta function in th Feynman rules?
- Vereinsamt
- · Replies 1 ·
Graduate Is Roger Penrose's Corkscrew Model of Magnetic Attraction Valid?
- Usaf Moji
- · Replies 10 ·
Graduate Where does phi go in the probability density for hydrogen?
- Signifier
- · Replies 2 ·
Graduate Schrodingers Cat and time evolution
- EddieZ
- · Replies 4 ·
Graduate What does H12*C2 mean in Feynman's equation 8.43?
- mkbh_10
- · Replies 1 ·
Graduate Does matter need to radiate energy to produce fields?
- zonde
- · Replies 11 ·
Graduate Solving Schrodinger's Cat Paradox: Is a Superman the Answer?
- ssampak
- · Replies 1 ·
Graduate What is your favored interpretation of quantum mechanics?
- Demystifier
- · Replies 64 ·
Graduate Virtual photon polarization in positive-negative interactions
- Usaf Moji
- · Replies 1 ·
Undergrad Why Angular momentum is important?
- russell23
- · Replies 5 ·
Graduate Hamiltonian and Lagrange density
- kaksmet
- · Replies 4 ·
Graduate SINGLE e-/photon diffraction patterns.
- neurocomp2003
- · Replies 13 ·
High School Possible to make 2 beams of light cancel?
- jasonhtml
- · Replies 4 ·
Graduate Is the Radial Momentum Operator Hermitian?
- plarq
- · Replies 1 ·
Undergrad Light, Vacuum, Speed, and Measurements
- DeepSeeded
- · Replies 2 ·
Graduate Photon Pairs - Can photons travel in pairs?
- Buckeye
- · Replies 7 ·
Graduate Microscopy using photons versus electrons
- redtree
- · Replies 1 ·
Graduate Double-Slit experiment in Quaternion Quantum Mechanics?
- robphy
- · Replies 4 ·
High School Where Do Electrons Move in Multi-Dimensional Space?
- curiousgirl
- · Replies 10 ·
Graduate Why doesn't quantum mechanics explain both wave and particle properties of the electron?
- rlduncan
- · Replies 47 ·
Graduate Explicit expressions for creation/annihilation operator of the free scalar field
- masudr
- · Replies 2 ·