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.
Threads
Graduate Why do quantum effects become negligible for large objects like billiard balls?
- popepius
- · Replies 1 ·
Graduate Completeness relation for polarization vectors
- center o bass
- · Replies 2 ·
High School What is the box in particle in a box?
- mishima
- · Replies 3 ·
Graduate Is commutativity transitive for non degenerate eigenvalues?
- bob900
- · Replies 1 ·
Graduate Magnetic moment of the electron and spin
- Thoros
- · Replies 7 ·
Graduate What is Isospin and How Does it Relate to the Strong Force?
- Antuanne
- · Replies 2 ·
Graduate Wave-Particle Duality: Random Photon Emission
- severo
- · Replies 5 ·
Graduate Is objective reality possible under orthodox QM?
- cdog1350
- · Replies 13 ·
Graduate Change in fine structure constant
- lark
- · Replies 18 ·
Graduate How did Schrodinger's model improve Bohr's model?
- mahrap
- · Replies 2 ·
Graduate Stationary States and time-independent states (aren't they the same?)
- MrMultiMedia
- · Replies 4 ·
Graduate Quantum particle in a rigid box with 2 given wavefunctions solving for energies
- CNMD
- · Replies 3 ·
Graduate What does a deBroglie wave look like?
- jimgraber
- · Replies 1 ·
Graduate Amount of energy required to change the spin of a photon
- San K
- · Replies 15 ·
Graduate Probability of finding particle
- Aziza
- · Replies 6 ·
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 ·