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 Interaction picture (Is there a mistake in QFT books?)
- jdstokes
- · Replies 3 ·
Graduate State of an electron, including spin
- msumm21
- · Replies 2 ·
Graduate Heuristic explanation of why quantum mechanics plus SR imply antiparticles
- feynmann
- · Replies 4 ·
Graduate Sudden Approximation and Adiabatic theorem
- Yiping
- · Replies 1 ·
Graduate Treating operators with continuous spectra as if they had actual eigenvectors?
- Marcaias
- · Replies 1 ·
Graduate IV curve on photoelectric effect
- KFC
- · Replies 1 ·
Graduate Phonons vs Gauge Bosons: What's the Difference?
- nuby
- · Replies 1 ·
Graduate Is There a Link Between the Brain and Dark Energy?
- PJ2001
- · Replies 1 ·
Graduate Solving Potential V with Schrodinger Equation
- KFC
- · Replies 5 ·
Undergrad Fundamental reason behind Aufbau principle
- tgt
- · Replies 3 ·
Graduate Adiabatic Spin Manipulation in EPR Experiment
- Jon_Trevathan
- · Replies 8 ·
Undergrad Looking for Layman's Physical Explanation for the lowest energy level in atoms
- feynmann
- · Replies 29 ·
Graduate When a particle tunnels where does the energy come from
- matt_crouch
- · Replies 9 ·
Graduate Photons determine the property of an electromagnetic wave
- FrankJ777
- · Replies 5 ·
Graduate Quantum Fluctuations of Negative Energy
- Unredeemed
- · Replies 7 ·
Graduate What is the Lamb-Dicke regime and how does it impact ion trapping experiments?
- Nusc
- · Replies 2 ·
Graduate Can spin-1/2 particles interfere after a Stern-Gerlach device?
- msumm21
- · Replies 12 ·
Graduate Raising and lowering operators acting on spin 1 kets?
- philip041
- · Replies 3 ·
Graduate Quantized vs. Continuous Variables
- Tac-Tics
- · Replies 11 ·
Graduate Why Is the Uncertainty Principle Considered Strange?
- mskaroly
- · Replies 3 ·
Undergrad Recommended references for quantum vs classical physics
- noobie!
- · Replies 2 ·
Graduate The Hilbert space of non-relativistic QM
- Fredrik
- · Replies 5 ·
Graduate About momentum operator in other coordinate system
- KFC
- · Replies 1 ·
Graduate Is wave-particle duality paradoxical at the foundation of quantum mechanics?
- tgt
- · Replies 38 ·
Graduate Direct Position Measurement on a Microscopic Scale with Twin Photons
- newbee
- · Replies 48 ·
Graduate Why do spin ½ particles need two full rotations to return to their original state?
- Love*Physics
- · Replies 15 ·
Graduate Identical bosons vs. fermions in square potential well
- bobshae
- · Replies 2 ·
Graduate Gauge Invariance: Classical vs Quantum
- captain
- · Replies 4 ·
Graduate Pauli's Wave Mechanics text. h vs. hbar
- Peeter
- · Replies 2 ·
Graduate Does the uncertainty principle affect gravitational fields?
- spidey
- · Replies 19 ·
Graduate What is Quantum Theory and Why Do Electrons Orbit at Specific Distances?
- quantum brain
- · Replies 5 ·
Graduate Product State Bra Order: Correct Form?
- KFC
- · Replies 2 ·
Graduate Why does reflection conserve coherence if photons transfer momentum?
- Dmitry67
- · Replies 2 ·
Undergrad Why do we use short wavelength photons in Compton scattering?
- KFC
- · Replies 2 ·
Graduate Does the calculated large cosmological constant in falsify QFT?
- ensabah6
- · Replies 6 ·
Graduate Quantization and fluid mechanics?
- quantumfireball
- · Replies 7 ·
Graduate Evaluating Feynman diagram in QFT without external fermion lines
- Amanheis
- · Replies 4 ·
Graduate Energy partition between molecules and radiation in a laser cavity at equilibrium
- Phrak
- · Replies 11 ·
Graduate Raising and lowering operators on a ket?
- philip041
- · Replies 18 ·
Graduate Orders of magnutide in Heisenberg's uncertainty principle
- Heirot
- · Replies 3 ·
Graduate The intense laser-atom physics and ionized electron
- xylai
- · Replies 7 ·
Graduate Does an operator on a bra state require taking its adjoint?
- KFC
- · Replies 9 ·
Graduate How does destructive interference set in when action exceeds h-bar in path integrals?
- sumeetkd
- · Replies 1 ·
Graduate Why can't we determine both energy and time exactly?
- pi.rootpi
- · Replies 3 ·
Graduate Understanding Spin States in Quantum Mechanics
- KFC
- · Replies 2 ·
Undergrad Basics of Quantum Chemistry, especially entanglement
- darkmatter(s)
- · Replies 5 ·
Graduate Is a Photon Massless or Does it Have Relativistic Mass?
- Nphysicist
- · Replies 13 ·
Graduate Operating on spin angular momenta
- runninglow
- · Replies 1 ·
Graduate Pulsing a diode laser with very long pulses and very low repetition rates
- r_daniel
- · Replies 2 ·
Graduate Two Identical Particles w/ Spin State s
- degerativpart
- · Replies 3 ·
Graduate Born rule vs ABL rule and time reversal in quantum mechanics
- Fredrik
- · Replies 15 ·
Graduate Greatest accuracy in the |mn> state is |n| = m
- bra-kets
- · Replies 2 ·
Graduate What are conjugate variables and why is there an uncertainty relation between them?
- spidey
- · Replies 2 ·
Graduate Properties of the Dirac delta function
- Fredrik
- · Replies 1 ·
Graduate Casimir Effect and Perpetual Motion
- Zeteg
- · Replies 16 ·
Graduate Expectation value for radius of an electron in a hydrogen atom
- emperrotta
- · Replies 8 ·
Graduate Older formulation of Pauli exclusion principle
- kandhakumar
- · Replies 2 ·
Graduate Drawback of Hartree Product in Chemistry
- kandhakumar
- · Replies 2 ·
Graduate Communicating through wave function collapse
- McGarr
- · Replies 10 ·
Graduate Cavitation-does it relate to the Big Bang?
- Earnest Stuar
- · Replies 6 ·
High School Looking for Layman's Physical Explanation for energy level in atoms
- feynmann
- · Replies 23 ·
Graduate Does an electron have a makeup
- ryn17
- · Replies 72 ·
Graduate Commutate relation of lowering operator and sperical tensor operators
- Einsling
- · Replies 1 ·
Graduate What are the key misconceptions about quantum mechanics interpretations?
- thenewmans
- · Replies 1 ·
Graduate Why does the wave function depend on time in a stationary state?
- KFC
- · Replies 5 ·
Graduate Are atoms spherical, or is that just a visualization model?
- Chaos' lil bro Order
- · Replies 30 ·
Graduate Effects of the Variation of the Parameters of the Standard Model
- Dmitry67
- · Replies 2 ·
Graduate What Is the Ground State of Bound Fermions in a Box?
- Evgeny Naumov
- · Replies 11 ·
Graduate Quantum Field Theory: Multiparticles and Single Particles
- martyf
- · Replies 2 ·
Graduate Need a topic for paper in modern physics
- dswatson
- · Replies 7 ·
Graduate Quantum Decoherence - how fast does it propagate?
- Dmitry67
- · Replies 15 ·
Graduate Peskin - exponention of disconnected diagrams
- PJK
- · Replies 3 ·
Graduate If we know a photon's momentum, can it be anywhere in the universe?
- glueball8
- · Replies 1 ·
Graduate Why quantization resolves negative energy in Klein-Gordon equation
- martyf
- · Replies 1 ·
Graduate Quantum observation and gravity as combined probability distributions
- lkubat
- · Replies 13 ·
Graduate Does backwards time travel violate the Heisenberg uncertainty principle?
- Math Jeans
- · Replies 31 ·
Graduate Interference pattern given many which-path detectors?
- gendou2
- · Replies 2 ·
Graduate Absorption Paradox: Continuous Photon Energies and Quantized Molecule Energies
- p.tryon
- · Replies 5 ·
Undergrad Photon spin - experimental evidence
- Usaf Moji
- · Replies 6 ·
Graduate Is Everything in the Universe Entangled According to Physics?
- pallidin
- · Replies 77 ·
Graduate Do spontaneous and stimulated emission obey to a Boltzmann's statistics ?
- fred_run
- · Replies 6 ·
Undergrad Can photons be generated without electrical current?
- cam875
- · Replies 34 ·
Graduate How Does Aperture Size Affect Laser Beam Uncertainty?
- fisico30
- · Replies 4 ·
Graduate WE theorem to evaluate matrix elements
- pollo
- · Replies 1 ·
Graduate The physical meaning of Pauli Spin Matrices
- gn0m0n
- · Replies 16 ·
Graduate Size does matter? Rayleigh scattering question
- DeepSeeded
- · Replies 1 ·
Graduate What does the |jjjj⟩ state represent in hydrogen atom wavefunctions?
- mrjammin
- · Replies 1 ·
Graduate Conservation of momentum in QFT
- jdstokes
- · Replies 1 ·
Graduate Vastness of space and infinite universes
- bxadook
- · Replies 3 ·
Undergrad Problem in the Defination of electon's wavelength
- soopo
- · Replies 2 ·
Undergrad Can Events with Zero Probability Actually Occur?
- lax1113
- · Replies 23 ·
Undergrad No coupling of Photons with eletric fields
- eintagsfliege
- · Replies 3 ·
Graduate Quantum Eraser and Delayed Choice Quantum Eraser
- thenewmans
- · Replies 1 ·
Graduate What exactly is psi(x) in quantum mechanics?
- joker_900
- · Replies 12 ·
Graduate Prove Spinor Identity in Arbitrary Dimension
- ismaili
- · Replies 1 ·
Graduate Does the Delayed Choice Experiment Challenge Classical Intuition?
- debra
- · Replies 1 ·
Graduate Is Angular Momentum Quantized in a Free Electron's Non-Orbital Motion?
- Eezekiel
- · Replies 14 ·
Graduate Wouldn't the Geiger Counter be considered a measuring device in SC?
- esvion
- · Replies 1 ·
Undergrad Refraction - The lingering question
- Burningmace
- · Replies 12 ·
Graduate Why 1D well must has this solution?
- KFC
- · Replies 6 ·