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 Bras and kets vs. Einstein summation convention
- HJ Farnsworth
- · Replies 5 ·
Graduate Quantum Distance? (See me derive it.)
- LiteHacker
- · Replies 3 ·
Graduate Is the Hydrogen Energy Level Formula Truly Degenerate in j?
- copernicus1
- · Replies 1 ·
Graduate Why must Quantum Computers be reversible?
- Lovelace
- · Replies 5 ·
Graduate Could a Semiconductor Plate Alter the Casimir Effect?
- Ergatron
- · Replies 6 ·
Graduate The Origins of Quantum Physics
- Master Wayne
- · Replies 6 ·
Graduate What happens to the wave function after it collapses?
- hover
- · Replies 10 ·
Undergrad Bohr model electron wavelengths
- copernicus1
- · Replies 4 ·
Graduate How Do Quantum Statistics Affect Energy Level Degeneracies in a SHO?
- Kontilera
- · Replies 1 ·
Graduate Why does rotating spin states give those coefficients?
- matematikuvol
- · Replies 9 ·
Graduate Looking for suggestions for an experiment involving Quantum theory and Biology?
- nukeman
- · Replies 1 ·
Graduate Quantum Computer, how to actually build one?
- MathematicalPhysicist
- · Replies 2 ·
Graduate Schrodinger equation, lowest potential energy
- dEdt
- · Replies 3 ·
Graduate Sign confusions on CFT (yellow book) Page 29
- ivantheczar
- · Replies 1 ·
Graduate What do |0,f⟩ and creation operator ĉ†_{k,σ} mean in second quantization?
- LagrangeEuler
- · Replies 6 ·
Undergrad Heisenberg s uncertainity principle
- baljit kaur
- · Replies 8 ·
Undergrad Where does the energy for electron movement in orbitals originate?
- scientifico
- · Replies 1 ·
Graduate Measuring Electron Position with Photon: The Uncertainty Principle
- swaroopkml
- · Replies 6 ·
Graduate Photon Wave Packet Envelope Question
- exmarine
- · Replies 17 ·
Graduate Understanding Tensor Integration Notation for 4-Dimensional Space
- superg33k
- · Replies 2 ·
Graduate The picture in the addition, you see one integral equation and I have
- opeth_35
- · Replies 2 ·
Graduate Are Spin and Quantum States Independent in Wave Functions?
- hokhani
- · Replies 2 ·
Graduate Spontaneous Symmetry Breaking -Conceptual Question
- BWV
- · Replies 2 ·
Undergrad Simple harmonic oscillator- the probability density function
- trelek2
- · Replies 11 ·
Graduate Why is the trace of a matrix defined as diagonal elements rather than eigenvalues?
- lathawarrier
- · Replies 9 ·
Graduate Why can the spin and the angular momentum transform to each other?
- ndung200790
- · Replies 13 ·
Graduate Limit to SHO / EM field analogy
- snoopies622
- · Replies 16 ·
Undergrad Are Pauli Matrices Unitary and Do Their Complex Conjugates Match?
- shounakbhatta
- · Replies 7 ·
Graduate Where did the 2*A^*<A> and 2*B^*<B> terms go?
- M. next
- · Replies 6 ·
Graduate Why Do Photons Disappear in a Perfectly Sealed Box?
- Quick Karl
- · Replies 16 ·
Graduate Why Does Quantum Mechanics Use Complex Probability Amplitudes?
- CrazyNeutrino
- · Replies 7 ·
Graduate Green's function for Klein-Gordon equation in x-space
- RedSonja
- · Replies 5 ·
Undergrad Kenetic Energy of a Particle due to Speed
- Bjarne
- · Replies 5 ·
Undergrad Why does electromagnetic radiation (energy) excite electrons?
- vanmaiden
- · Replies 6 ·
Graduate Do Electron Holes Have Spin Angular Momentum?
- Goalie33
- · Replies 15 ·
Graduate Can we measure the effective mass of charge carriers using a centrifuge?
- Enthalpy
- · Replies 24 ·
Graduate Does quantum mechanics contradict cause and effect?
- quantum7
- · Replies 8 ·
Graduate Entanglement across different frames of references
- San K
- · Replies 4 ·
Graduate Questions about information in QM
- Dmitry67
- · Replies 8 ·
Graduate Unitarity of Time-evolution Operator
- kiwakwok
- · Replies 6 ·
Graduate Encyclopedia of Gamma Matrix Representations?
- EuphoGuy
- · Replies 2 ·
Graduate A couple of easy questions related to quantum mechanics
- lep11
- · Replies 1 ·
Graduate Time Dependence of Expectation Values
- phys_student1
- · Replies 7 ·
Graduate Understanding Normalization Factors in Scientific Research
- M. next
- · Replies 6 ·
Graduate Could Electrons Exist in 4 Dimensions?
- Raven Luni
- · Replies 6 ·
Graduate What is Heisenberg Uncertainty Formula?
- ZedCar
- · Replies 3 ·
Graduate What experiment best demonstrates electron radiation?
- madus
- · Replies 5 ·
Graduate No general quantization recipe?
- wdlang
- · Replies 4 ·
Undergrad What's the motivation of using silver atoms in the Stern-Gerlach experiment？
- kof9595995
- · Replies 5 ·
Graduate Time dependent pertubation theory
- Kontilera
- · Replies 2 ·
Graduate Quantum entanglement hinting at the nature of reality?
- serp777
- · Replies 13 ·
Graduate Quantum Mechanics and Classical Mechanics: Is there a connection?
- Amok
- · Replies 3 ·
Graduate Why use h instead of ℏ/2 for phase space cell volume in statistical mechanics
- Icefrog
- · Replies 1 ·
Graduate Do individual electrons create interference patterns or hit randomly one at a time?
- Esoremada
- · Replies 3 ·
Graduate What Is the Doppler Effect in Matter Waves?
- teros
- · Replies 6 ·
Graduate Two atoms at opposite sides of the universe are connected?
- Niaboc67
- · Replies 11 ·
Graduate Question regarding sudden approximation
- azztech77
- · Replies 1 ·
Graduate Understanding Physics Through Randomness: A Curious Adult
- weisenhm
- · Replies 1 ·
Graduate Problem with Parity for photons
- LayMuon
- · Replies 2 ·
Graduate Difference wave mch. and field operators.
- Sigurdsson
- · Replies 5 ·
Graduate Physically, what do positive frequency modes represent?
- jarod765
- · Replies 2 ·
Graduate Is the expectation value of momentum of a stationary state zero?
- praharmitra
- · Replies 9 ·
Graduate Why does measuring energy collapse to a stationary state in Griffiths?
- DocZaius
- · Replies 6 ·
Undergrad Heisenberg's uncertainity principle
- 106267
- · Replies 2 ·
Graduate How can the integral of a bra and ket in equation (6) of Berry's 1984 paper be a vector?
- Syrus
- · Replies 31 ·
Graduate Square of a finite deltafunction
- center o bass
- · Replies 1 ·
Graduate Why must S-matrix contributions have exact operator matching in QED?
- center o bass
- · Replies 5 ·
Graduate Why do photons have momentum if dp/dt is zero?
- coki2000
- · Replies 3 ·
Graduate Deriving the free particle wave function e^(2πi(kx−nt))
- Shan K
- · Replies 2 ·
Graduate What are the differences between mass-carrying, force-carrying and matter particles?
- umair20
- · Replies 1 ·
Graduate Could a Fermion be Entangled with a Boson ?
- Tanmoy2012
- · Replies 1 ·
Graduate How do I treat IR divergences in e+/e- to mu+/mu- scattering?
- eoghan
- · Replies 1 ·
Graduate The HUP, simultaneous measurements, and eigenfunctions
- jmcelve
- · Replies 11 ·
Graduate How can free electrons in metals have energy levels?
- apb86
- · Replies 2 ·
Graduate Where does non-locality originate in dBB theory?
- LukeD
- · Replies 194 ·
Graduate Lightspeed and entanglement 'phone' question
- tribetype40
- · Replies 2 ·
Graduate Partial trace of the density matrix
- climbon
- · Replies 1 ·
Graduate 'Toy' universe complying with Bell experiments
- IttyBittyBit
- · Replies 26 ·
Graduate Atomic electric field an issue
- ChaseRLewis73
- · Replies 5 ·
Graduate Is There an Anti-Universe and Do Antimatter Particles Effect Themselves?
- chuckosity
- · Replies 3 ·
Graduate Observation time and its relation to the quantum Zeno effect
- xaratustra
- · Replies 1 ·
Graduate Russian Roulette and schrodinger's cat
- sodaboy7
- · Replies 2 ·
Graduate Two level system Schrodinger Equation problem
- TheDestroyer
- · Replies 2 ·
Graduate Does the Higgs mechanism explain inertia and relativistic mass increase?
- sweet springs
- · Replies 1 ·
Graduate Bound states in propagator
- geoduck
- · Replies 1 ·
Graduate Quantum Mechanics Before Classical Mechanics: Implications and Speculations
- jacar3000
- · Replies 5 ·
Graduate When does a wavefunction inherit the symmetries of the hamiltonian?
- espen180
- · Replies 3 ·
Graduate Does first order QED matrix elements vanish?
- center o bass
- · Replies 4 ·
Graduate Normalization to delta distribution
- Jano L.
- · Replies 3 ·
Graduate What Determines the Barrier Field in Fowler-Nordheim Tunneling?
- martin f
- · Replies 1 ·
Graduate Normalisation of quantum states
- bayners123
- · Replies 4 ·
Graduate Why Does Bra-Ket Notation Assume Linearity in Quantum Mechanics?
- sliorbra
- · Replies 7 ·
Graduate Find Complex Conjugate of u_j in Adjoint of Equation
- cragar
- · Replies 1 ·
Graduate Why does the black body spectrum require quantization of light?
- holtto
- · Replies 8 ·
Graduate What is the purpose of the Schrodinger wave equation in quantum mechanics?
- nouveau_riche
- · Replies 13 ·
Graduate The arguments against macroscopic quantum states are
- skynelson
- · Replies 11 ·
Graduate Electron and graviton degrees of freedom
- unih
- · Replies 2 ·
Graduate Square root of volume in fourier expansion of the vector potential
- center o bass
- · Replies 1 ·
Graduate Difference between active and passive transformations.
- thepopasmurf
- · Replies 5 ·
Graduate Does QED reproduce classical electrodynamics? How?
- Feynlee
- · Replies 5 ·