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 Question on spin-zero Feynman rules
- Einj
- · Replies 1 ·
Graduate Has quantum physics proven that thoughts become reality?
- Goosejournals
- · Replies 6 ·
Graduate Spontaneous symmetry breaking: How can the vacuum be infinitly degener
- youngurlee
- · Replies 4 ·
Graduate Understanding Noether's Theorem in Quantum Field Theory - K. Huang's Explanation
- jtceleron
- · Replies 1 ·
Graduate Where does the raised index come from in the Klein-Gordon equation?
- spacelike
- · Replies 3 ·
Graduate Diffraction of individual photons
- gespex
- · Replies 5 ·
Graduate Why don't scalar fields propagate superluminally?
- ramparts
- · Replies 2 ·
Graduate What is the Quantum Force and How Does it Govern Atomic Vibrations?
- somebody314
- · Replies 14 ·
Graduate Quantum mechanics without spacetime
- math_04
- · Replies 6 ·
Graduate Discreet Quanta versus the Continuous Electromagnetic Spectrum
- Mcellucci
- · Replies 4 ·
Graduate Are entangled particle outcomes determined by the unit circle?
- rlduncan
- · Replies 11 ·
Graduate State space of QFT, CCR and quantization, and the spectrum of a field?
- youngurlee
- · Replies 1 ·
Graduate Shrodinger's Waves, and Heisenberg's Matrices
- Leucippus
- · Replies 4 ·
Graduate Why is ℏ under the square root in the momentum representation Fourier transform?
- LagrangeEuler
- · Replies 1 ·
Graduate How Do You Compose Three Ket Vectors in Quantum Mechanics?
- copernicus1
- · Replies 7 ·
Graduate Is there any evidence at all for quantum counscoiusness
- batmanandjoker
- · Replies 10 ·
Graduate HUP and Conservation of momentum
- g.lemaitre
- · Replies 19 ·
Undergrad Schrodinger equation dedution step?
- tsuwal
- · Replies 5 ·
Graduate A physical example approximating the idealized situation
- ENDLESSYOU
- · Replies 1 ·
Graduate Shadow on Wall: Light Blur from Wave or Quantum?
- xzardaz
- · Replies 2 ·
Graduate What is the mathematical intuition behind operator embedding?
- jshrager
- · Replies 2 ·
Graduate Bounding the speed of `spooky action at a distance'
- thenewmans
- · Replies 14 ·
Graduate Why does the de Broglie wave function satisfy the Schrödinger equation?
- Roodles01
- · Replies 4 ·
Graduate Bell State of two non-orthogonal modes
- McLaren Rulez
- · Replies 9 ·
Graduate Scope of Pauli's Exclusion Principle
- Aniket1
- · Replies 3 ·
Graduate Why Does Phase Velocity Differ in Relativistic and Non-Relativistic Cases?
- qbslug
- · Replies 1 ·
Graduate Wave Particle Duality: Is It Mass-Energy Equivalence?
- GeneralOJB
- · Replies 1 ·
Graduate Translation operator. Infinite potential well.
- LagrangeEuler
- · Replies 9 ·
Graduate About spin being an internal symmetry
- jtceleron
- · Replies 2 ·
Graduate Is spin the only physical parameter that can be entangled?
- edpell
- · Replies 3 ·
Graduate Commuting Operators and Eigenfunctions in One Dimension
- LagrangeEuler
- · Replies 4 ·
Graduate Relationship Between the Probability Current and Continuity Equation
- darfmore
- · Replies 1 ·
Graduate What does orthogonality of quantum states mean physically?
- pluspolaritons
- · Replies 4 ·
Graduate How to measure the external quantum efficiency of OLEDs?
- Mr. Johnson
- · Replies 4 ·
Graduate Did weak measurements of photon polarization violate Heisenberg uncertainty?
- Coin
- · Replies 16 ·
Graduate Uncertainty about Heisenberg Uncertainty Principle
- Steve Brown
- · Replies 22 ·
Graduate Why do 4x4 quantum gates act on two-qubit systems?
- pleasehelpmeno
- · Replies 4 ·
Graduate Can Negative Energy Be Produced in Small Amounts Through the Casimir Effect?
- Chemist@
- · Replies 9 ·
Graduate About Schrödinger-Heisenberg connection
- snoopies622
- · Replies 5 ·
Graduate The dirac equation of the hydrogen atom
- Kamper
- · Replies 5 ·
Graduate Density matrix for bell states
- pleasehelpmeno
- · Replies 6 ·
Graduate Does the Pauli exclusion principle emerge from fundamental quantum equations?
- anorlunda
- · Replies 7 ·
Graduate Observables, Measurements and all that
- spookyfw
- · Replies 5 ·
Graduate Lorentz contraction in the Quantum realm
- fermi
- · Replies 2 ·
Graduate Hydrogen molecule in a small box, thought experiment
- edpell
- · Replies 3 ·
Undergrad Why does higher frequency mean higher energy in photons?
- petr1
- · Replies 3 ·
Graduate If the universe scaled down to the Planck length, would physics change?
- DrZoidberg
- · Replies 4 ·
Graduate What affects the probability of finding a system in the ground state?
- LagrangeEuler
- · Replies 1 ·
Graduate Could Quantum Entanglement Allow for Faster Than Light Communication?
- Crazymechanic
- · Replies 13 ·
Graduate How can we measure the reality in quBits?
- o0_manifold_0o
- · Replies 4 ·
Graduate On my way to Heisenberg uncert. princ.
- 71GA
- · Replies 1 ·
Undergrad How Do Experimental Physicists Measure Momentum?
- nonequilibrium
- · Replies 24 ·
Graduate Source of Virtual Particles in Space?
- Ty1erC
- · Replies 67 ·
Graduate How is QED solved non-perturbatively, basic outline.
- Spinnor
- · Replies 7 ·
Graduate QFT Ground State Analysis: Understanding e^(-iHT) |0>
- silverwhale
- · Replies 3 ·
Graduate Photon into matter - antimatter pair production question.
- esmeralda4
- · Replies 1 ·
Graduate Two questions on Clebsch-Gordan coefficients
- Yoran91
- · Replies 3 ·
Graduate When to treat a particle as a wave based on de Broglie wavelength?
- Hercuflea
- · Replies 4 ·
Graduate Breaking wavefunction into pieces
- copernicus1
- · Replies 1 ·
Graduate Why Must Quantum Physics Involve Discrete Quanta?
- TGlad
- · Replies 9 ·
Graduate Why don't virtual particles cause decoherence?
- Mukilab
- · Replies 131 ·
Graduate I question the double-slit experiment:
- Symmetry3
- · Replies 4 ·
Graduate Prove that the angular momentum operator is hermitian
- Septim
- · Replies 3 ·
Graduate Pauli Exclusion Principle and Entanglement
- g.lemaitre
- · Replies 3 ·
Graduate Why is Schrodinger's Cat entangled? Or is it not?
- QuantumPixel
- · Replies 3 ·
Graduate Can Einstein-Rosen bridges exist and be traversed?
- Kutt
- · Replies 12 ·
Graduate Understanding Quark-Gluon Vertex in QCD Feynman Rules
- Einj
- · Replies 7 ·
Graduate Are |0⟩ and |1⟩ eigenvectors of σz by convention?
- lewis198
- · Replies 1 ·
Graduate A little Bra-Ket notation theorem that I don't get
- Excimer
- · Replies 13 ·
Graduate Free particle wave function and Ehrenfest's theorem
- rays
- · Replies 10 ·
Graduate Spin orbit coupling and hydrogen problem
- aaaa202
- · Replies 1 ·
Graduate Effect of photon detection mid-way between (double) slit and screen
- San K
- · Replies 2 ·
Graduate Is Spin Networks Still Relevant in Quantum Gravity Research Today?
- TGlad
- · Replies 2 ·
Graduate Why are Lz and Ly zero for an electron on a carbon nanotube surface?
- aaaa202
- · Replies 3 ·
Graduate Time derivative of creation/annhilation operators
- pleasehelpmeno
- · Replies 3 ·
Graduate Simultaneity of Uncertainty Principle
- tomwilliam2
- · Replies 3 ·
Graduate Why are Bell's inequalities violated?
- JK423
- · Replies 97 ·
Graduate Gaussian function to derive Heisenberg's uncertainty principle
- 71GA
- · Replies 19 ·
Graduate Constructing a Toffoli gate with qubit gates?
- randomafk
- · Replies 1 ·
Graduate Collapse of state vector for continuous eigenvalues
- bob900
- · Replies 3 ·
Undergrad Paul Dirac's 1933 research paper
- sudu.ghonge
- · Replies 3 ·
Graduate Proving Pauli Matrices are Generators of SU(2)
- LayMuon
- · Replies 11 ·
Graduate Will an electron vibrating in a 1D radiates?
- thitchen
- · Replies 7 ·
Graduate Understanding Spin Orbit Coupling: Deriving the Hamiltonian
- aaaa202
- · Replies 1 ·
Graduate About interchange phase of identical particles in Weinberg's QFT book
- kof9595995
- · Replies 5 ·
Graduate Why does high particle momentum imply short-scale physics in the uncertainty principle?
- ndung200790
- · Replies 8 ·
Graduate I don't understand why -1/2 is the higher energy level and +1/2 is the
- duggielanger
- · Replies 1 ·
Graduate Group velocity in infinite square well
- 8Apeiron8
- · Replies 3 ·
Undergrad Black body and continuous spectrum
- jaumzaum
- · Replies 3 ·
Graduate I am getting into a mess with the HUP
- MHD93
- · Replies 12 ·
Graduate A question on the product of two real linear operators
- Excimer
- · Replies 2 ·
Undergrad The heck with the Cat, what about the Human?
- jmoorhea
- · Replies 8 ·
Graduate What is the state vector after measuring
- aaaa202
- · Replies 7 ·
Graduate Why is the exponential derivative operator a translational operator?
- matematikuvol
- · Replies 10 ·
Graduate What is a pure quantum state and a mixed quantum state?
- rsaad
- · Replies 4 ·
Graduate Maxwell's equations from U(1) symmetry
- Thoros
- · Replies 5 ·
Graduate Is radioactive decay reversible in time?
- Izzhov
- · Replies 2 ·
Graduate Quantum Communication: Two-Way Messaging Without Physical Link?
- Stanley514
- · Replies 3 ·
Graduate Is the Book's Photon Calculation Off by a Factor of 1000?
- Fluxthroughme
- · Replies 5 ·
Graduate Heisenberg's uncertainty principle invalidated?
- quantumphilosopher
- · Replies 23 ·