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 What proof is there that quantum states collapse on measurement?
- hdsncts
- · Replies 3 ·
Graduate Is the Group Velocity Double the Phase Velocity at Low Velocities?
- RANDHIR SINGH
- · Replies 1 ·
Graduate Hermitian adjoint of the time derivative?
- leright
- · Replies 7 ·
Graduate Quantum Entanglement and retrocausality
- onigiri
- · Replies 8 ·
Graduate Spin Exchange in Fermi Sea - Evaluating S_x \cdot S_{x+1}
- andrewm
- · Replies 1 ·
Graduate A relativistic quantum theory of gravity
- meopemuk
- · Replies 49 ·
Graduate Why does the sum ∑_x e^{i(k-k')x} equal the Kronecker delta?
- andrewm
- · Replies 4 ·
Graduate Vacuum state of the Klein-Gordon field
- knobelc
- · Replies 9 ·
High School My First Double Slit Experiment
- thenewmans
- · Replies 4 ·
Graduate Derivative inside, outside time ordering
- ismaili
- · Replies 4 ·
Graduate Stern-Gerlach apparatus with excited helium: why aren't Mj states equally probable?
- folgorant
- · Replies 7 ·
Graduate Quantum Physics, Causality, and Logic
- avant-garde
- · Replies 2 ·
Graduate Light Interaction with Electrons in Glass
- thenewmans
- · Replies 7 ·
Graduate Why Davisson and Germer proved electron waves over particle scattering
- student85
- · Replies 3 ·
Graduate Calculating Broglie Wavelength for Helium Superfluid
- glueball8
- · Replies 3 ·
Undergrad Can We See Photons With Naked Eye?
- Sabradin
- · Replies 21 ·
Graduate Revolutionary Experiment Confirms Incompleteness of Quantum Mechanics
- Rade
- · Replies 35 ·
Graduate Photons Detector not yielding which-path info.
- wampeter
- · Replies 44 ·
Graduate Commuting Operators in Sequential Stern Gerlach Experiment
- maverick280857
- · Replies 16 ·
Graduate Measurement and Stern Gerlach Experiments review articles?
- maverick280857
- · Replies 3 ·
Undergrad Distance Between Atoms: How to Measure
- Legion81
- · Replies 8 ·
Graduate Linus Pauling's Hydrogen Atom: MVR=nh/2pi?
- The_ArtofScience
- · Replies 1 ·
Graduate Quantum Mechanics: Learning Bra-Ket Notation
- Reedeegi
- · Replies 4 ·
Graduate Coherent States of the Harmonic Oscillator
- tshafer
- · Replies 2 ·
Graduate Questions about the Density Operator Formulation of Quantum Mechanics
- CPL.Luke
- · Replies 3 ·
Graduate Does turning off a measuring device still collapse the wave function?
- Sabradin
- · Replies 11 ·
Graduate How Do Quantum Computers Use Qubits in Superposition for Calculations?
- Nick89
- · Replies 2 ·
Graduate Why doesn't photon helicity equal the spin magnitude?
- Usaf Moji
- · Replies 2 ·
Graduate Does the universe need a wave function to describe it?
- C Rob
- · Replies 3 ·
Graduate How do I calculate the initial alpha for an iterative process in a finite well?
- bluestar
- · Replies 3 ·
Graduate Massless free field equation -> Maxwell's eqn.
- lark
- · Replies 10 ·
Graduate What is a wave function and how does it describe the wave nature of a particle?
- janakiraman
- · Replies 4 ·
Graduate Concept of a renormalizable theory in Weinberg's feild theory book
- nughret
- · Replies 5 ·
Undergrad What does the Hamiltonian of a system describe?
- janakiraman
- · Replies 13 ·
Graduate Quantum computing and Nanoscale CAD
- BWV
- · Replies 5 ·
Graduate What Would Happen If 2 Protons Collided?
- Dumbo
- · Replies 1 ·
Graduate Solving Fermions: Finding States & Energies
- guidob
- · Replies 4 ·
Undergrad Why is the Weak Force So Weak?
- carus88
- · Replies 2 ·
Graduate Why spinor bec is called ''spinor bec''?
- wdlang
- · Replies 1 ·
Graduate Why Don't Electrons Fall into the Nucleus Despite the Uncertainty Principle?
- kahoomann
- · Replies 10 ·
Graduate What is the difference between chirality and helicity?
- gremezd
- · Replies 6 ·
Graduate Projection postulate - can it be verified?
- ala
- · Replies 17 ·
Graduate Dirac delta spherical potential
- neworder1
- · Replies 5 ·
Graduate What Is the Simplest Picture for Entangled Particles?
- wawenspop
- · Replies 10 ·
Graduate Improving the Gottesman-Chuang quantum digital signature scheme
- Dragonfall
- · Replies 2 ·
Graduate Are ghosts Feynman diagram overcounting or longitudinal photons?
- captain
- · Replies 1 ·
Undergrad Finding n for Line Spectra with 400 nm Wavelength
- pisay
- · Replies 1 ·
Undergrad Gravity and its effect on particles/molecules and bonds.
- g__ritchie
- · Replies 7 ·
Undergrad Detecting Single Photon Energy
- splinewave
- · Replies 3 ·
Graduate Questions about some material from Dirac
- JasonJo
- · Replies 1 ·
Graduate Differentiation of an exponential with operators (Peskin p.84)
- gremezd
- · Replies 4 ·
Graduate Is the Integral of the Square of Phase Density Constant in Classical Mechanics?
- xylai
- · Replies 1 ·
Graduate Electrons travel faster than the speed of light
- epkid08
- · Replies 90 ·
Graduate The Principle of Least Action in Quantum Physics
- lugita15
- · Replies 10 ·
Graduate Quantum attraction by exchange of particles
- yoyoq
- · Replies 1 ·
Graduate Why add momentum and energy equations when solving for photon momenta
- jk4
- · Replies 3 ·
Graduate Renormalization in Fluidodynamics
- random3f
- · Replies 1 ·
Graduate Total Spin of Two Particles w/ Spin 1
- Usaf Moji
- · Replies 2 ·
High School Basic question on electron, ion and photon excitation
- guorenguoren
- · Replies 1 ·
Help with attached file
- cosmology
- · Replies 1 ·
Graduate Is there a description of collapse in QFT ?
- dreynaud
- · Replies 3 ·
Graduate Pair Production and Momentum Transfer in Photon Interactions
- jk4
- · Replies 4 ·
Undergrad Heisenbergs Uncertainty Principle
- Niles
- · Replies 38 ·
Graduate What's wrong with Heisenberg's microscope?
- kahoomann
- · Replies 11 ·
Graduate What is the significance of singlets and gauge invariance in particle physics?
- ledamage
- · Replies 7 ·
Graduate Is probability a Quantum Observable ?
- dreynaud
- · Replies 12 ·
Graduate Can a cat truly be the observer in Schrödinger's thought experiment?
- nepofazz
- · Replies 1 ·
Undergrad Double slit experiment with barrier between slits and detector
- netjim66
- · Replies 3 ·
Graduate What the state of Quantum mechanics (QM) is?
- xylai
- · Replies 15 ·
Graduate Mach-Zehnder Interferometer at Wiki Question
- daniel29208
- · Replies 1 ·
Graduate Why is the ground state energy 1/2ℏω, not zero, in the harmonic oscillator?
- adartsesirhc
- · Replies 2 ·
Graduate What Is the Role of the Hamiltonian in Quantum Mechanics?
- Xezlec
- · Replies 35 ·
Graduate Rotate Photon Polarization: 90 Degrees?
- Dragonfall
- · Replies 2 ·
Graduate Pauli exclusion principle question
- drullanorull
- · Replies 2 ·
Graduate Kinetic Energy in Non-Normalized Particle State
- jalobo
- · Replies 1 ·
Graduate Quantizing a two-dimensional Fermion Oscillator
- jostpuur
- · Replies 88 ·
Graduate Laser Tube Cavities: Increasing Power w/Mirrors?
- mharney1268
- · Replies 4 ·
Graduate Can orthogonal qubits always be distinguished by a measurement?
- Dragonfall
- · Replies 3 ·
Graduate Rotating Bose gases, quantum vortices
- confused_man
- · Replies 9 ·
Graduate Dimensional Regularization of an Integral
- Sunset
- · Replies 2 ·
Graduate What if Planck's Constant was 6.63x10^30?
- the iron maiden
- · Replies 15 ·
Graduate Exclusion Principle and Symmetry in Multi-Electron Systems
- Bobhawke
- · Replies 13 ·
Graduate R. Slansky, Group theory for unified model building
- jpg15
- · Replies 5 ·
Undergrad Why Was "h" Chosen for Planck's Constant?
- FordPrefect
- · Replies 3 ·
Graduate How do path amplitudes cancel in Feynman's QED partial reflection?
- STS816
- · Replies 5 ·
Graduate Time depending quantum solution
- timgor
- · Replies 1 ·
Graduate The dangers of heuristic reasoning
- Count Iblis
- · Replies 2 ·
Graduate Clebsch-Gordan coefficients for spin-one particle decomposition
- Marty
- · Replies 16 ·
Graduate Particle in 1-D Box: Pressure Force on Wall
- libai
- · Replies 1 ·
Graduate What are some common questions about Peskin's QFT book?
- ismaili
- · Replies 3 ·
Graduate Is the Born Rule Rooted in Classical Wave Energy Principles?
- ThomasT
- · Replies 5 ·
Graduate Destroying interference pattern of classical waves
- Count Iblis
- · Replies 6 ·
Graduate Why are Photons Massless? Zach's Questions
- zwest135
- · Replies 10 ·
Graduate How does the photon absorption process work in atoms?
- caybo
- · Replies 1 ·
Graduate QFT and local gauge invariance
- losang
- · Replies 5 ·
Graduate Counter example to the Bloch's theorem?
- jostpuur
- · Replies 11 ·
Graduate QFT: Find Poincare Group Generators in QFT
- udaraabey
- · Replies 2 ·
Graduate Does the uncertainty principle break symmetry?
- kahoomann
- · Replies 5 ·
Graduate Why Does a Wave Packet Better Describe a Particle in Quantum Mechanics?
- shubhajit
- · Replies 2 ·
Graduate Understanding Bras and Kets as Vectors and Tensors
- Phrak
- · Replies 154 ·