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 is the significance of the LSZ reduction formula in Srednicki's QFT book?
- haushofer
- · Replies 9 ·
Unreliable Sci-Fi Writer Attributes Quantum Flux
- flatmaster
- · Replies 3 ·
Graduate Why is a probe field necessary in pump-probe experiments?
- KFC
- · Replies 4 ·
Graduate Little fundamental question
- facenian
- · Replies 3 ·
Graduate Diffraction Grating Video (QED)
- maverick_starstrider
- · Replies 2 ·
Graduate Answer Me Precisely: Electronic Density Probability
- Karrar
- · Replies 5 ·
High School Cave of the Winds, CO - photons
- neg entropy
- · Replies 3 ·
Graduate Why Do Electromagnetic Interactions Involve Photons as Mediators?
- tiny-tim
- · Replies 2 ·
Graduate Is free will possible in Conway and Kochen's FW theorem?
- Descartz2000
- · Replies 4 ·
Undergrad Understanding Atom Excitation: Natural vs Triggered Movement and Photon Emission
- wavingerwin
- · Replies 3 ·
Are there any real quantum experiment videos available online?
- maverick_starstrider
- · Replies 10 ·
Graduate Question on function of operators
- facenian
- · Replies 6 ·
Graduate Are Quantum Boundaries Indefinite?
- wittgenstein
- · Replies 4 ·
Undergrad I really with spin quantum number.
- Sunny09
- · Replies 1 ·
Graduate Second Quantization: What Is It?
- hagopbul
- · Replies 1 ·
Graduate Wavefunction for particle inside a disk
- lolgarithms
- · Replies 13 ·
Undergrad Photoelectric Effect and light as a particle
- Cmertin
- · Replies 6 ·
Graduate Non-degenerate and degenerate perturbation theory
- Lucien1011
- · Replies 13 ·
Graduate Are virtual particles real or just mathematical tools?
- wittgenstein
- · Replies 5 ·
Graduate Energy, Time, Position, Momentum which is more fundamental?
- compton
- · Replies 4 ·
Graduate Fourier transform of a wave equation
- mvillagra
- · Replies 6 ·
Graduate The Energy Levels of a Quantum Harmonic Oscillator
- mrausum
- · Replies 2 ·
Graduate Why Is the Hermiticity of the Density Operator Important in Quantum Mechanics?
- KFC
- · Replies 4 ·
Graduate What is the relationship between temperature and emissive power for a gas?
- lumberbunny
- · Replies 1 ·
Graduate Why is the sum over all connected diagrams with a single source in QFT zero?
- PJK
- · Replies 6 ·
Graduate Isn't classical spin an instance of spin 1?
- pellman
- · Replies 3 ·
Graduate Spin 360 rotation - experiment
- neworder1
- · Replies 2 ·
Graduate Could Electrons Have an Internal Structure Beyond Fundamental Particles?
- ghostanime2001
- · Replies 6 ·
Graduate Is causality challenged by quantum theory's reliance on indeterminacy?
- Borean
- · Replies 56 ·
Graduate How Does Information Influence Quantum Particle Indistinguishability?
- neworder1
- · Replies 6 ·
Graduate Position and momentum operators in quantum field theory
- pellman
- · Replies 12 ·
Graduate How have breakthroughs in quantum mechanics been applied to real-world applications?
- leftyguitarjo
- · Replies 10 ·
Undergrad What Causes an Atom to be Unstable and More Prone to Radioactive Decay?
- daisey
- · Replies 25 ·
Undergrad What Is the Casimir Effect?
- Benjamin113
- · Replies 2 ·
Graduate Questions about variations on Double Slit experiment
- underworld
- · Replies 3 ·
Graduate Pertubation and density matrix
- KFC
- · Replies 2 ·
Undergrad How to make light act like a particle?
- Cmertin
- · Replies 1 ·
Undergrad Ionisation and the Photoelectrical Effect
- Spud101
- · Replies 3 ·
Graduate Hydrogen on one side, Helium on the other, and nothing in between ?
- SimonA
- · Replies 11 ·
Undergrad What CAUSES black cody radiation?
- mahela007
- · Replies 7 ·
Graduate What is the definition of a momentum *measurement*?
- pellman
- · Replies 2 ·
High School Do photons reflect off surfaces and what reflects them?
- Spud101
- · Replies 3 ·
Graduate How Is the Thickness of a Quantum Well Determined?
- silentlamp
- · Replies 1 ·
Graduate Does a Free Particle in Quantum Mechanics Have Constant Energy?
- xcorat
- · Replies 1 ·
Graduate Most accurate form of maxwell equations?
- DeepSeeded
- · Replies 10 ·
Graduate Spontaneous Symmetry breaking,phase factor
- krishna mohan
- · Replies 3 ·
Graduate Perpendicularity of quantuum states
- markoX
- · Replies 11 ·
Graduate Understanding X Quantum Gate: Act on |i> State?
- markoX
- · Replies 2 ·
Graduate Does the Born rule have implications for cosmology?
- Count Iblis
- · Replies 24 ·
Graduate Is Quantum Entanglement Just Correlation or a Real Physical Process?
- PlayUK
- · Replies 176 ·
Graduate Feynman diagram: incoming and outgoing particles
- Dmitry67
- · Replies 1 ·
Graduate Waves - bound and unbound states
- quasar_4
- · Replies 1 ·
Graduate Four momentum vector from energy-momentum-tensor
- torus
- · Replies 2 ·
Graduate Cassimir effect on a grand scale
- Chaos' lil bro Order
- · Replies 5 ·
Graduate Is there a paradox involving the Dirac equation and commutation with time?
- ginda770
- · Replies 1 ·
Graduate How does the Schrödinger equation lead to the QM theory of measurement?
- LeonhardEuler
- · Replies 6 ·
Graduate Can determinism survive quantum mechanics if outcomes are predetermined?
- sftrabbit
- · Replies 24 ·
High School Can energy be lost from a Photon?
- Spud101
- · Replies 16 ·
Graduate Black body radiation cavity with hole and thermal equilibrium
- nietzsche
- · Replies 8 ·
Graduate Can Virtual Particles in the Vacuum be Directly Detected?
- AmyS7
- · Replies 3 ·
Graduate Do non-local hidden variable theories account for Bose-Einstein condensates?
- maverick_starstrider
- · Replies 5 ·
Graduate Hardy's paradox in Bohm, Copenhagen, and MWI interpretations
- Descartz2000
- · Replies 8 ·
Graduate Faster-than-light communication
- Albert V
- · Replies 36 ·
Graduate Synthesis between Quantum Chaos and QFT.
- MathematicalPhysicist
- · Replies 3 ·
Undergrad How does the Electron get knocked off by a photon
- raknath
- · Replies 25 ·
Graduate What Is the Casimir Effect and Its Relation to Vacuum Energy?
- eimos
- · Replies 32 ·
Graduate Solution gross pitaevskii equation
- dahaf
- · Replies 1 ·
Graduate Does classical angular momentum conservation derive Planck's constant?
- LarryS
- · Replies 3 ·
Undergrad Why can't we see a laser beam in a perfect vacuum?
- JSEverex
- · Replies 5 ·
Graduate Why don't the Slits collapse the wave function?
- kliide
- · Replies 90 ·
Graduate Did photon obey Uncertainity Principle?
- sndtam
- · Replies 8 ·
Writing a science fiction novel
- MrMyagi
- · Replies 2 ·
Graduate Commutator of Position and Energy
- meichenl
- · Replies 2 ·
Graduate Antimatter interact with massive matter through gravity.
- jweygna1
- · Replies 3 ·
Graduate Particle collisions collapse wave function?
- mordechai9
- · Replies 2 ·
Graduate About Feynman rules for an external field
- Sleuth
- · Replies 2 ·
Graduate Does reducing slit width to single atoms still produce interference in Young's experiment?
- raknath
- · Replies 3 ·
Graduate Is p²/2m the energy operator in momentum representation?
- Geezer
- · Replies 1 ·
Graduate Why does the Schrödinger cat paradox require the Copenhagen interpretation?
- ArielGenesis
- · Replies 103 ·
Graduate Does a Collision in Space Affect a Spaceship's Center of Mass Motion?
- Count Iblis
- · Replies 1 ·
Graduate Matter waves with zero momentum and single-slit diffraction
- hotcommodity
- · Replies 5 ·
High School Electron Orbits and Nuclei 2- Rotation vs Orbital Motion
- Karrar
- · Replies 74 ·
Graduate Simultaneous diagonalization and replacement of operators with eigenvalues ?
- AxiomOfChoice
- · Replies 1 ·
High School Does light have an electric charge?
- gonegahgah
- · Replies 2 ·
Graduate Generator of rotations rotations of WHAT?
- AxiomOfChoice
- · Replies 4 ·
Graduate Expectation of the Wilson Loop
- Perturbation
- · Replies 2 ·
Graduate Is 3s to 2s transition for Hygrogen forbidden?
- SimonZ
- · Replies 7 ·
Graduate Very elementary notation question
- romistrub
- · Replies 3 ·
Undergrad Uncertainty in simple harmonic oscilator
- omri3012
- · Replies 1 ·
Graduate Understanding UV/IR Terminology in Physics
- ramparts
- · Replies 4 ·
Graduate Why are electrons lighter but larger than quarks?
- sidmontu
- · Replies 6 ·
Graduate The Difference Between a Few Terms
- Jilvin
- · Replies 2 ·
Graduate Lorentz Algebra in Boosts for the spin-1/2 Dirac Field
- maverick280857
- · Replies 3 ·
Graduate Path Integrals in QED: Solve by Substituting Classical Solution?
- RedX
- · Replies 4 ·
Graduate A silly question I'm sure about Feynman's many paths
- jaketodd
- · Replies 62 ·
Graduate Moments in QM: When Can I Say JLS^2 Approx Equal JL+S?
- Petar Mali
- · Replies 5 ·
Graduate Uncertainty principle violation?
- espen180
- · Replies 4 ·
Graduate Quantum Tunneling - some silly thoughts
- annatar
- · Replies 3 ·
Graduate Parallel universes and the Quantum Field
- MrMyagi
- · Replies 2 ·
Undergrad Electron Phasepositive and negative?
- rabbitweed
- · Replies 2 ·