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 How to relate the expansion term to Feynman diagrams
- chern
- · Replies 1 ·
Undergrad Superposition of particle identities
- bsaucer
- · Replies 8 ·
High School Single photons and expanding spheres of light
- Zebulin
- · Replies 20 ·
Undergrad Path Integrals in Quantum Theory
- rocdoc
- · Replies 3 ·
Undergrad What basically is Klein tunneling ?
- phywithAK
- · Replies 3 ·
High School Does Observing an Entangled Particle Affect Its Superposition?
- Allen_Wolf
- · Replies 8 ·
Undergrad Measurement of the mean value of the number of photons?
- Pattarasak
- · Replies 9 ·
Undergrad When Should the Bohr Atom Behave Classically?
- Sahar ali
- · Replies 3 ·
High School Exactly why FTLC is impossible with entangled photons?
- Karagoz
- · Replies 40 ·
Graduate Why Do Feynman Rules Successfully Model Particle Interactions?
- MathematicalPhysicist
- · Replies 1 ·
Undergrad A computational model of Bell correlations
- PAllen
- · Replies 76 ·
Undergrad Orthogonality vs eigenvalue separation in quantum mechanics
- LarryS
- · Replies 9 ·
Undergrad Symmetric and Antisymmetric Wavefunction
- fog37
- · Replies 11 ·
Graduate Stochastic signal analysis in QM
- Peter Morgan
- · Replies 7 ·
Undergrad Baryon asymmetry of the universe
- Kajagoogooooooo
- · Replies 15 ·
Graduate Randomness of quantum mechanics and Pi
- kolleamm
- · Replies 10 ·
Graduate Nonlinear Schrodinger equation and linearity of Q.M.
- Buddha_the_Scientist
- · Replies 3 ·
High School Probability of a photon passing through a filter
- Karagoz
- · Replies 5 ·
Undergrad What is the device used to observe electrons passing through slits?
- Hussein Tofaili
- · Replies 2 ·
Graduate What are the real-world benefits of quantum computers and how do they work?
- ISamson
- · Replies 33 ·
Undergrad How do photons transfer energy to electrons in photoelectric and Compton effects?
- Sandeep T S
- · Replies 30 ·
Undergrad Measurement effect ('collapse') question
- kw1
- · Replies 8 ·
Graduate On tempered distributions and wavefunctions
- dumpling
- · Replies 5 ·
Graduate Coulomb Klein Gordon: Where does e^(-iEt) come from?
- xhwvnsghsfasd
- · Replies 1 ·
Undergrad Can Photons from Distant Quasars Decay into Particle Pairs in Vacuum?
- intervoxel
- · Replies 2 ·
Undergrad Building intuition for Quantum Mechanics
- RubinLicht
- · Replies 2 ·
Graduate Bohr's complementarity is completed with entanglement?
- jfizzix
- · Replies 22 ·
Undergrad What is the origin of quantization?
- Choi
- · Replies 2 ·
Graduate Generalized free fields as dark matter?
- Peter Morgan
- · Replies 4 ·
Undergrad I want to read about the electron nucleus interaction
- gnnmartin
- · Replies 4 ·
Undergrad In quantum statistics, inhibition/enhancement factors
- Dubz
- · Replies 2 ·
Undergrad How a group of nucleus can act as a circular aperture
- Alvan
- · Replies 1 ·
High School Why do scientists claim that there's true randomness?
- Karagoz
- · Replies 7 ·
Undergrad "Derivation" of the Schrödinger Equation
- BearY
- · Replies 4 ·
Undergrad Interference of a single photon in an interferometer
- weezy
- · Replies 26 ·
Graduate Division by zero when applying the inverse momentum operator
- hilbert2
- · Replies 12 ·
Undergrad Definition of "info" as it pertains to string theory
- CessnaTexan
- · Replies 1 ·
Undergrad The inequality in the Heisenberg uncertainty relation
- Derek P
- · Replies 6 ·
Undergrad Infinite or undefined standard deviation in HUP
- nomadreid
- · Replies 6 ·
High School Looking for a quantum mechanics expert to interview for a research paper
- Adam Kohnle
- · Replies 1 ·
Graduate Particle moving on a constrained path
- hilbert2
- · Replies 1 ·
Undergrad Determining the accuracy of the Variational Method
- joel31
- · Replies 1 ·
High School Relation between spin and symmetry of wave function
- Jigyasa
- · Replies 1 ·
Undergrad State Vectors vs. Wavefunctions
- AspiringResearcher
- · Replies 32 ·
Undergrad Require a source for a delocated photon pair
- Derek P
- · Replies 2 ·
Undergrad Quantum Field Configurations and Wavefunctions
- rocdoc
- · Replies 4 ·
Undergrad Work Out Number of Photons in Vacuum
- Bruce Haawkins
- · Replies 8 ·
Undergrad How does the thickness of a beam splitter affect the phase shift produced?
- confused_man
- · Replies 4 ·
High School Understanding Causality in Quantum Mechanics
- mohamed amine
- · Replies 8 ·
Undergrad Why is there an arrow mediating a process in a Feynman diagram?
- Phys12
- · Replies 8 ·
Undergrad Normalization and the probability amplitude
- redtree
- · Replies 5 ·
Undergrad Use the Dirac Equation to calculate transition frequencies in Hydrogen
- neilparker62
- · Replies 13 ·
Undergrad What is the Electromagnetic Wave in this Animation?
- marksyncm
- · Replies 6 ·
High School Can two teams measure position and momentum simultaneously?
- Thomas Gajdek
- · Replies 3 ·
Graduate Successive iteration problem in quantum dissipation article
- moso
- · Replies 19 ·
Undergrad Why is the 6th spectral series neglected and where does it fall in the EM spectrum?
- Sahar ali
- · Replies 11 ·
High School How do the group and phase velocities of pilot waves compare?
- Azurite
- · Replies 17 ·
Undergrad Representations in Quantum Physics
- fresh_42
- · Replies 15 ·
Graduate Quantum field theory, spacetime, and coordinates
- Demystifier
- · Replies 60 ·
Undergrad Why “If Lz has a well-defined value, then Lx and Ly do not”？
- hilily
- · Replies 6 ·
High School Planck level effects of virtual particles
- DGator86
- · Replies 17 ·
Undergrad Domino Valdano's percentages explaining quantum entanglement
- X53
- · Replies 14 ·
Undergrad Can matter come into existence in empty space?
- Neil Condon
- · Replies 5 ·
Undergrad Why does Weinberg set p' = p on RHS but not LHS in equation 2.5.14?
- kent davidge
- · Replies 6 ·
Undergrad In entanglement, are all properties correlated or just the measured one?
- iamcj
- · Replies 23 ·
Graduate Field quantization and photon number operator
- Peter Morgan
- · Replies 6 ·
Undergrad A proposed experiment to test quantum gravity
- mfb
- · Replies 12 ·
Undergrad Why Is the Planck Scale a Limit in Cosmological Constant Calculations?
- exponent137
- · Replies 10 ·
Graduate Electron-Hole- or Many-Electron Exchange Interaction
- Nabla94
- · Replies 2 ·
Undergrad Does the Schrödinger equation link position and momentum?
- AuxPart
- · Replies 3 ·
Undergrad How Do Indices Determine Positions in a Quantum Density Matrix?
- doggydan42
- · Replies 5 ·
High School How do we know we have a single-photon source?
- Johan0001
- · Replies 11 ·
High School Does Thermal Radiation from Ordinary Materials Span All Wavelengths?
- titansarus
- · Replies 1 ·
Undergrad Looking for a few questions on "foundations of quantum physics" for Adam Becker
- Greg Bernhardt
- · Replies 24 ·
High School Black hole emits quantum particles from the mass sucked in?
- diPoleMoment
- · Replies 3 ·
Undergrad Understanding black body radiation
- Sophrosyne
- · Replies 4 ·
Undergrad Why don't we ever hear about low-frequency photons?
- Rob Lewis
- · Replies 12 ·
Undergrad Some (unrelated) questions about the measurement problem
- haushofer
- · Replies 89 ·
Undergrad Simplify the Dirac Energy Equation?
- neilparker62
- · Replies 2 ·
Undergrad Double-Slit Interference w/ Separate Sources
- Adiater
- · Replies 12 ·
Undergrad Can a photon change frequency and become a different color?
- gmalcolm77
- · Replies 13 ·
Undergrad Two dimenstional Heisenberg Hamiltonian for spin 1/2 system
- Noora Alameri
- · Replies 1 ·
Undergrad What causes the formation of multiple sub-beams in the Stern Gerlach Experiment?
- fog37
- · Replies 9 ·
Undergrad The mechanism of entangled particles
- entropy1
- · Replies 38 ·
Undergrad For a particle on a sphere, is zero energy possible?
- blaisem
- · Replies 5 ·
Undergrad One particle and two slits
- Mentz114
- · Replies 8 ·
High School Amplitude of a photon's E and B fields
- slow
- · Replies 6 ·
Undergrad Feynman Diagram-Momentum conservation in primitive vertex
- Phys12
- · Replies 12 ·
Graduate Is non-linear quantum mechanics (even) plausible?
- Derek P
- · Replies 6 ·
High School Do systems continually evolve?
- rede96
- · Replies 30 ·
Undergrad Calculating the fine structure constant in Feynman diagrams
- Phys12
- · Replies 1 ·
Undergrad Virtual particles in Feynman diagrams
- Phys12
- · Replies 1 ·
High School How does a Hawking radiation photon escape while entangled with the captured one?
- Zaphodpsi
- · Replies 23 ·
Undergrad Line Spectra and low density gases
- fog37
- · Replies 5 ·
Graduate Can disjoint states be relevant for the same quantum system?
- leo.
- · Replies 4 ·
Graduate Quantum-first gravity - Steve Giddings
- Greg Bernhardt
- · Replies 1 ·
High School Can Entanglement be Used for Faster-than-Light Communication?
- Allen_Wolf
- · Replies 25 ·
Graduate Are vacuum EM modes circularly polarized according to QED?
- Pet Scan
- · Replies 3 ·
Undergrad How do simple roots of U(1) relate to electric charge?
- Superfluid universe
- · Replies 9 ·
Graduate Why Do LS and jj Coupling Differ in Spectral Line Transitions?
- bentzy
- · Replies 12 ·