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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Undergrad Is the Compton scattering angle related to the incident energy?
- Adel Makram
- · Replies 3 ·
Graduate Hamiltonian in an electromagnetic field
- Lucy166
- · Replies 1 ·
Undergrad Can angular momentum be applied to non circular rotations?
- Fruit Water
- · Replies 2 ·
Undergrad Schwinger effect verified by Unruh temperature?
- jcap
- · Replies 5 ·
Undergrad Hamiltonian for an Optical Phase Shifter?
- Twigg
- · Replies 1 ·
Undergrad Does adding one quark to a million change QCD system properties?
- tzimie
- · Replies 19 ·
Undergrad What is the experimental difference between spin down and minus spin down?
- Getterdog
- · Replies 6 ·
Undergrad The Relation Between Wavefunctions in Dirac Equation
- Bob Dylan
- · Replies 11 ·
Graduate What are local and non-local operators in QM?
- cristianbahena
- · Replies 5 ·
Undergrad Dirac's Rest Mass in Minowski Spacetime
- Bob Dylan
- · Replies 4 ·
Undergrad Dirac-Delta Function, Different Integration Variable
- Ibraheem
- · Replies 14 ·
Undergrad Little issue regarding physical states
- Tio Barnabe
- · Replies 37 ·
Undergrad Modified double-slit experiment - two photons
- MichPod
- · Replies 13 ·
High School Quantum Mechanics is not a theory?
- Zafa Pi
- · Replies 19 ·
Graduate How does a pseudo-Hermitian model differ from a Hermitian?
- SeM
- · Replies 13 ·
Graduate Mathematical Quantum Field Theory - Field Variations - Comments
- Urs Schreiber
- · Replies 6 ·
High School Casimir effect, energy conservation
- Gabriele Pinna
- · Replies 3 ·
Graduate Mathematical Quantum Field Theory - Geometry - Comments
- Urs Schreiber
- · Replies 32 ·
Graduate Mathematical Quantum Field Theory - Lagrangians - Comments
- Urs Schreiber
- · Replies 42 ·
Graduate Quantum physics phenomena that have spiral-phase portraits?
- SeM
- · Replies 16 ·
Graduate Transformation of position operator under rotations
- Anj123
- · Replies 1 ·
Graduate Shor's algorithm - need to uncompute auxiliary qubits?
- jarekduda
- · Replies 2 ·
High School Beam splitter, one photon, one detector?
- Idunno
- · Replies 11 ·
High School Quantum Tunneling: Reflection and Transmission Probabilities Explained
- PGaccount
- · Replies 3 ·
Undergrad Canonical Quantization: Proving the Theory
- Silviu
- · Replies 7 ·
Undergrad 2-particle Wavefunction and the Pauli Exclusion Principle
- Isaac0427
- · Replies 38 ·
Undergrad Requirements for pair production
- mark!
- · Replies 19 ·
High School Why Can't Two Fermions Occupy the Same Quantum State?
- riz
- · Replies 3 ·
Undergrad Can We Cool a Macroscopic Crystal to 1 nK?
- Petr Matas
- · Replies 8 ·
Undergrad Fubini-Study metric of pure states
- Alex Cros
- · Replies 9 ·
Undergrad Can Entangled Clocks Synchronize Time in Quantum Physics?
- .Scott
- · Replies 18 ·
Undergrad What does complex conjugate of a derivate mean?
- jstrunk
- · Replies 6 ·
Undergrad Understanding Neutron Star Formation Through Feynman Diagrams
- doggydan42
- · Replies 4 ·
Undergrad Quantum Entanglement: Particle Connection Effects
- Dan Nixon
- · Replies 7 ·
Undergrad Distinguishing electrons through spin
- Josh1079
- · Replies 6 ·
Undergrad Why does Fermi pressure derivation use both ultra-cold and relativistic limits?
- Silviu
- · Replies 5 ·
Undergrad Measurement Values for z-component of Angular Momentum
- MoAli
- · Replies 1 ·
Undergrad What mechanism enables interaction of the fields?
- Paul Woods
- · Replies 8 ·
Graduate Shor's algorithm and similar exploitation of QM?
- jarekduda
- · Replies 11 ·
Undergrad How does a harmonic oscillator model have the same frequency
- Fruit Water
- · Replies 1 ·
Undergrad Understanding Continuous Variable QKD
- Dopplershift
- · Replies 1 ·
Graduate Why light beams attract or repel each other even when they don't have charge
- SunRay-dvsh
- · Replies 20 ·
Undergrad Dirac equation solved in Weyl representation
- Milsomonk
- · Replies 2 ·
Undergrad Typo in Weinberg annihilation operator expression for bosons and fermions?
- Tio Barnabe
- · Replies 16 ·
Undergrad Do superposition states satisfy the time-dependent Schrödinger equation?
- dyn
- · Replies 2 ·
Undergrad Can Photons travel faster than c?
- Electric to be
- · Replies 46 ·
Undergrad Feynman Path Integral: Teaching and Questions
- Swamp Thing
- · Replies 8 ·
Undergrad Fluorescence from core shell quantum dots
- avkr
- · Replies 1 ·
Graduate Functional derivatives and propagators in φ³ theory tadpole diagrams
- Opus_723
- · Replies 2 ·
High School How do I learn about particle spin from basics?
- ISamson
- · Replies 12 ·
Graduate Can there be a subquantum level?
- quiet
- · Replies 15 ·
Undergrad Alternate form of wave equation
- Daniel Sellers
- · Replies 2 ·
Undergrad Why are fermion-only or boson-only systems easier to study than mixed states?
- Tio Barnabe
- · Replies 2 ·
Undergrad LS-Coupling: intuition why 2p^2 has no singlet P?
- Twigg
- · Replies 4 ·
High School Possible Loophole in the uncertainty principle
- RevolutionaryThinker
- · Replies 14 ·
Graduate Mathematical Quantum Field Theory - Spacetime - Comments
- Urs Schreiber
- · Replies 6 ·
Undergrad Multiplying a wavefunction by a constant number
- dyn
- · Replies 12 ·
Undergrad Dirac Matrices and the Pythagorean Theorem
- Bob Dylan
- · Replies 2 ·
Undergrad Generating a Hilbert space representation of a wavefunction
- SeM
- · Replies 43 ·
Graduate Integral ##\int_{-1}^{1} [P_{l}^{m}]^2 ln [P_{l}^{m}]^2 dx##
- dongsh2
- · Replies 12 ·
Undergrad Probability vs radial density-confusion
- cr7einstein
- · Replies 2 ·
Undergrad Wave Functions of Definite Momentum
- Jimmy87
- · Replies 41 ·
Undergrad Does the path Integral contain virtual particles?
- friend
- · Replies 21 ·
Undergrad Probability of Staying in x<0 for Superposition of 2 Gaussians
- WWCY
- · Replies 10 ·
Graduate Hilbert space notation in topological quantum field theory
- nateHI
- · Replies 1 ·
Undergrad Where Does the Energy Go in a Quantum System with 3 Possible Measurements?
- romsofia
- · Replies 8 ·
Undergrad Can a wave-function be a combination of states with different energies?
- dRic2
- · Replies 18 ·
Undergrad Probability amplitude between non-eigenstate quantum states
- Opus_723
- · Replies 9 ·
Undergrad Will a uniform magnetic field be considered as measurment?
- Adel Makram
- · Replies 35 ·
High School Alain Aspect's experiment setting
- Joao
- · Replies 17 ·
High School Is energy the same as matter in physics?
- jubalsquirrelly
- · Replies 7 ·
Undergrad Berry phase, Bra-Ket and gradient
- Lucy166
- · Replies 5 ·
Undergrad What is the Conservation of Information in Quantum Mechanics?
- Samo_phy
- · Replies 19 ·
Undergrad Measurement of a particle's position using photons
- Frank Castle
- · Replies 10 ·
High School Computing electron gyromagnetic ratio in lattice QFT
- star apple
- · Replies 12 ·
Undergrad What is "unitary evolution" of something in physics?
- Suekdccia
- · Replies 1 ·
Graduate Does measurement preserve unitarity in quantum mechanics?
- kdv
- · Replies 16 ·
Undergrad Why there must be a way of including gravity into a quantum theory?
- Tio Barnabe
- · Replies 14 ·
Insights Introduction to Perturbative Quantum Field Theory - Comments
- Urs Schreiber
- · Replies 108 ·
High School Can Fermions Exhibit Negative Chemical Potential Like Bosons?
- Vrbic
- · Replies 5 ·
High School Why is light reflected at the same angle rather than isotropically?
- Vrbic
- · Replies 3 ·
High School What is the Meaning of Abstraction in Modern Physics?
- Ken Ucarp
- · Replies 14 ·
Graduate Why is the Dirac Hamiltonian with commutation relations unbounded below?
- Turbotanten
- · Replies 5 ·
High School Understanding Measurements / Collapse
- 1977ub
- · Replies 49 ·
High School How do particles become entangled?
- ISamson
- · Replies 16 ·
Undergrad Double sided arrow notation in Dirac Field Lagrangian
- TAKEDA Hiroki
- · Replies 1 ·
Undergrad Under what conditions do the Zeno and anti Zeno effects occur?
- Trollfaz
- · Replies 1 ·
Undergrad Quantum entanglement, wave-function collapse
- Tara Sunray
- · Replies 13 ·
Graduate Different types of interference phenomena in physics
- Leo1233783
- · Replies 2 ·
Undergrad Why does the Hermitian operator condition flip the operator in the bra?
- WWCY
- · Replies 14 ·
Undergrad How Does Shankar Transition from Sums to Integrals in Feynman Path Integrals?
- Opus_723
- · Replies 2 ·
High School Schroedinger Equation and Hamiltonian
- mieral
- · Replies 41 ·
Undergrad Are RF Photons Present in NMR Spectroscopy?
- Frank Peters
- · Replies 13 ·
Graduate Why does de Broglie-Bohm theory require non-locality?
- sanman
- · Replies 23 ·
High School Inner product of functions of continuous variable
- Ibraheem
- · Replies 7 ·
Undergrad Contour integral from "QFT for the gifted amateur"
- marcom
- · Replies 8 ·
Undergrad Invariant element integrand
- Tio Barnabe
- · Replies 4 ·
Undergrad Multiplying wavefunction with complexnumber.
- olgerm
- · Replies 7 ·
Undergrad 1s orbital overlaps with the nucleus, why don't they interact?
- rumborak
- · Replies 11 ·
Undergrad Trying to understand Dirac Hamiltonian
- Tio Barnabe
- · Replies 5 ·