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 Peter Woit's free QT, Groups and Representations ebook
- Greg Bernhardt
- · Replies 5 ·
High School What Are Constrained Quantum States and Their Implications?
- Trollfaz
- · Replies 2 ·
Undergrad Has Planck length been derived rigorously?
- muzukashi suginaiyo
- · Replies 9 ·
High School Does an electron's position collapse when measuring g factor?
- joegibs
- · Replies 17 ·
Undergrad If an electron isn't fundamental, what fields are it made of
- joegibs
- · Replies 3 ·
Undergrad Extended hamiltonian operator for the Hydrogen atom
- PedroBittar
- · Replies 3 ·
Undergrad Interpreting "momentum" in WKB approximation
- deep838
- · Replies 3 ·
High School How can something be both a particle and a wave?
- rahaverhma
- · Replies 49 ·
Undergrad Elementary particle transformations/couplings
- stg213
- · Replies 3 ·
High School Is the passage of time caused by the rate of particle collapse from superposition?
- Rachel Lee Pierce
- · Replies 7 ·
Graduate Deriving the Kubo Formula for Viscosity in Thermal Relativistic QFT
- Kurret
- · Replies 2 ·
Undergrad What is (rest) mass for a particle?
- calinvass
- · Replies 3 ·
High School Can tachyons be messenger particles between entangled particles?
- Debaa
- · Replies 25 ·
Undergrad Berry phase mechanism in adiabatic anyon exchange
- throneoo
- · Replies 1 ·
High School What’s the difference between TIQM and Time Symmetric QM? (a
- thenewmans
- · Replies 4 ·
Undergrad Physical significance of a.σ in expectation -E(a.σ b.σ)?
- N88
- · Replies 82 ·
Undergrad Position representation of the state of the system
- fog37
- · Replies 70 ·
Graduate Deriving matrix element from Lagrangian
- spaghetti3451
- · Replies 1 ·
Graduate Is the Effective Potential the same Quantum Potential?
- vincequantum93
- · Replies 1 ·
Undergrad What is the physical meaning "without spin-orbit interaction
- cytksu
- · Replies 4 ·
Undergrad Name for electron's trajectory outside of the orbit?
- icakeov
- · Replies 8 ·
Undergrad First order perturbation derivation
- spacetimedude
- · Replies 6 ·
High School What is the Quantum of Sound in Gases and Air
- ThunderLight
- · Replies 11 ·
Undergrad Calculating Hamiltonian matrix elements in a chaotic system
- Pyrus96
- · Replies 1 ·
Undergrad How is the order of events reversed in 1 trillion frames per second videos?
- Ostrados
- · Replies 12 ·
Undergrad Why Don't L2 and Ly Commute When L2 and Lx Do?
- dyn
- · Replies 3 ·
High School Entanglement measurements timing
- Ostrados
- · Replies 22 ·
Undergrad Does femtosecond light pulse experiment support Schrödinger's cat?
- bodycode
- · Replies 24 ·
Graduate Are two models with the same S matrix directly related by their parameters?
- gonadas91
- · Replies 3 ·
Undergrad Are quantum fields unobservable if their expectation value is zero?
- dm4b
- · Replies 45 ·
Undergrad Can quantum Zeno effect be applied to macroscopic systems?
- Trollfaz
- · Replies 1 ·
Undergrad How is Graphene's Hamiltonian rotationally invariant?
- Type1civ
- · Replies 2 ·
High School Untappable quantum communications?
- GTOM
- · Replies 7 ·
Undergrad Is the spin linked to the third quantum number ?
- Dinofou
- · Replies 3 ·
Undergrad Coherent Photons: Uncertainty and Locality
- Marrrrrrr
- · Replies 4 ·
Undergrad Can the spin states of a spin1 particle be modeled?
- edguy99
- · Replies 4 ·
Undergrad Is the particle in a 1-D infinite well doubly degenerate?
- dyn
- · Replies 7 ·
Undergrad How can an atom change from ground to excited state?
- ConfusedRookie
- · Replies 18 ·
Undergrad Entanglement, magnetic field and conservation law
- Adel Makram
- · Replies 15 ·
High School Dirac Equation: Combining Quantum Mechanics and Special Relativity
- cube137
- · Replies 11 ·
Graduate Scale invariant inverse square potential
- hilbert2
- · Replies 15 ·
Undergrad Maxwell's Equation's From Klein Gordon
- bhobba
- · Replies 2 ·
Undergrad How does nucleation work in cosmology?
- Rodrigo Olivera
- · Replies 1 ·
Undergrad QFT operators time/space asymmetry?
- TeethWhitener
- · Replies 8 ·
High School Quantum gravity and worldlines
- cube137
- · Replies 1 ·
High School Wave particle duality - my visual/mental image
- smsaks2000
- · Replies 1 ·
Undergrad Does measuring entangled spins on different axes break anti-correlation?
- edguy99
- · Replies 26 ·
Graduate Understanding spin precession in a magnetic field
- Tainty
- · Replies 5 ·
High School Can You Really Observe a Wave Function Without Collapsing It?
- Debaa
- · Replies 5 ·
Undergrad Does the position operator act on wave functions as $\hat{x}|\psi\rangle$?
- davidge
- · Replies 14 ·
Undergrad Orthogonality of Momentum Eigenstates: Why is ##\int e^{-ix}e^{2ix}dx=0##?
- Isaac0427
- · Replies 3 ·
Graduate Photon angular momentum and magnetic quantum number selection rules
- Tainty
- · Replies 30 ·
Undergrad Matrix Mechanics and non-linear least squares analogy?
- mike1000
- · Replies 30 ·
Undergrad Normalizing a Discrete Sum: Is the Wavefunction Fully Normalized?
- Isaac0427
- · Replies 2 ·
Undergrad Does accelerating one momentum-entangled particle affect the other?
- Ostrados
- · Replies 15 ·
Undergrad Thinking about the static electric field in terms of QFT
- FallenApple
- · Replies 10 ·
Undergrad Understanding Scalar Quantity in Basic Bra-Ket Arithmetic
- Vitani11
- · Replies 18 ·
Undergrad Lamb shift and the QFT vacuum....
- asimov42
- · Replies 3 ·
Undergrad Given a Hamiltonian, finding the energy levels
- Buggy Virus
- · Replies 4 ·
Undergrad Cgs or SI in quantum field theory?
- nomadreid
- · Replies 6 ·
High School Double slit probability question
- entropy1
- · Replies 143 ·
Undergrad Is E<mc^2 Critical for the Klein Paradox in Potential Step Analysis?
- Joker93
- · Replies 1 ·
Graduate Can entangled photons explore black hole interiors?
- Cindy Hops
- · Replies 10 ·
Undergrad The spin of the photon -- a weird experiment with a laser
- donavi
- · Replies 1 ·
Graduate Deriving the Lagrangian from the Hamiltonian operator
- redtree
- · Replies 3 ·
Undergrad What is the name for the "stuff" at heart of black hole?
- Cindy Hops
- · Replies 2 ·
High School Does a particle have a conscience of its own?
- Debaa
- · Replies 3 ·
Graduate Description of imaging through lens using quantized EM field
- zxontt
- · Replies 7 ·
High School Finding total angular momentum eigenvalues for multi-particle spin systems
- Lola1
- · Replies 1 ·
Undergrad Why quote the 10^120 vacuum energy discrepancy if cutoffs violate Lorentz invariance
- asimov42
- · Replies 3 ·
Undergrad A question from reading Feynman's book on QED
- mike1000
- · Replies 15 ·
Undergrad Deriving Spherical Harmonics from Sakurai's Book
- davidge
- · Replies 12 ·
Undergrad Position and Momentum are random variables in QM?
- mike1000
- · Replies 4 ·
Undergrad Article on Quantum Bootstrapping and Geometric Theory Space
- jedishrfu
- · Replies 1 ·
High School Wavelength of Particles Moving at 1m/s
- Daniel Petka
- · Replies 2 ·
Undergrad What Do Elements in the Quantum Probability Formula <Ψ|P|Ψ> Represent?
- mike1000
- · Replies 7 ·
Undergrad Does a Delta Potential Barrier Allow for Bound Solutions?
- dyn
- · Replies 1 ·
Undergrad Photon and electron phase in polarization and interference
- Talisman
- · Replies 2 ·
Undergrad Proof that parity operator is Hermitian in 3-D
- dyn
- · Replies 16 ·
High School Can Quantum Linked Signals Be Observed in Real-Time in Space?
- Brad Jamison
- · Replies 5 ·
Undergrad Conservation of energy in quantum measurement
- maline
- · Replies 40 ·
Graduate Why the inside of a box is coherent
- Binax011
- · Replies 4 ·
Undergrad Entanglement versus non-interacting multi-particle systems
- fog37
- · Replies 18 ·
Graduate Mathematical formulation of local non-realism
- greypilgrim
- · Replies 5 ·
High School Quantum Tunneling and Heat Distribution in Laser Cavities?
- Daniel Petka
- · Replies 7 ·
High School Funneling Light to an Electron: A Size Challenge
- gmalcolm77
- · Replies 1 ·
Undergrad What is the speed of decoherence and its predictions for coherent systems?
- Binax011
- · Replies 8 ·
Undergrad Do I have the correct form for the number of states, the |n>?
- rocdoc
- · Replies 14 ·
Undergrad About general solutions to Schrodinger equation
- betelgeuse91
- · Replies 13 ·
Undergrad Is Light a Particle or a Wave in Different Contexts?
- qnach
- · Replies 4 ·
High School Rest Energy - Kinetic Energy
- orangepeelsnice
- · Replies 3 ·
Undergrad Extending an infinitesimal operator
- davidge
- · Replies 4 ·
Graduate Is the electron a fundamental particle?
- Ostrados
- · Replies 3 ·
Undergrad What is the Wave Function and How Does it Compare to the Schrodinger Equation?
- Xilus
- · Replies 3 ·
Undergrad Is the Planck Length the Ultimate Limit of Measurement?
- nomadreid
- · Replies 5 ·
Undergrad Why does the Dirac equation act on a 4-component spinor?
- Milsomonk
- · Replies 2 ·
Undergrad Does the Uncertainty Principle restrict a particle's path?
- mike1000
- · Replies 29 ·
Undergrad Built an HBT Interferometer but don't get the physics
- Mellowed
- · Replies 1 ·
Undergrad Which ψ do I use for the Expectation Value ?
- SpaceNerdz
- · Replies 3 ·
Undergrad How to synthesize quantum circuits?
- nashed
- · Replies 1 ·