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.
Threads
High School What do these wavenumbers correspond to in Raman spectroscopy?
- Lotto
- · Replies 5 ·
Undergrad Ballentine Equation 5.13 on conservation of momentum
- EE18
- · Replies 3 ·
Graduate Von Neumann's uniqueness theorem (CCR representations)
- Heidi
- · Replies 9 ·
Undergrad Does an electron have a quantum phase frequency?
- H_A_Landman
- · Replies 36 ·
Undergrad Prefactor in Canonical Quantization of Scalar Field
- thatboi
- · Replies 4 ·
Undergrad Momentum eigenfunctions in an infinite well
- dyn
- · Replies 31 ·
Undergrad Potential energy of spin anti-alignment
- Sky Darmos
- · Replies 14 ·
High School Does anything happen in the quantum world?
- DiamondHead
- · Replies 12 ·
Graduate Quantum analog of Boltzmann entropy?
- Demystifier
- · Replies 43 ·
High School How to show that particle spin includes angular momentum?
- snoopies622
- · Replies 14 ·
Graduate Momentum operator -- Why do we use the plane wave solution?
- zb23
- · Replies 8 ·
Undergrad QED Renormalization Counterterm Confusion
- thatboi
- · Replies 6 ·
High School What are the energy eigenvalues of a harmonic oscillator?
- Lotto
- · Replies 2 ·
Undergrad Interaction of EM radiation with Glass
- Jimmy87
- · Replies 14 ·
Undergrad Mach-Zehnder interferometer, but with an entangled beam?
- Marilyn67
- · Replies 33 ·
Undergrad What is the relation between the Dirac equation and QED?
- thaiqi
- · Replies 7 ·
Undergrad What happens when circular polarization meets a diagonal polarizer?
- fluidfcs
- · Replies 20 ·
Undergrad Repeated measurements on a quantum system interacting with other quantum systems
- accdd
- · Replies 3 ·
Graduate How to derive Quantum Mechanics in curved physical space?
- victorvmotti
- · Replies 6 ·
High School Is a Spin 2 Particle the Key to Understanding Gravitation in Quantum Mechanics?
- Omega0
- · Replies 26 ·
Graduate Multiparticle Relativistic Quantum Mechanics in an external potential
- curious_mind
- · Replies 22 ·
Undergrad Can Quantum Effects Prevent Reaching Absolute Zero?
- nomadreid
- · Replies 3 ·
Undergrad Measurement of a superposition and Born's rule
- mbond
- · Replies 22 ·
Undergrad What is a microscopic particle when not being measured or observed?
- Suryabarta Saha
- · Replies 4 ·
Graduate Symmetries of particle interacting with external fields (Ballentine)
- EE18
- · Replies 5 ·
Graduate Ballentine on construction of the (Galilean) symmetry generators
- EE18
- · Replies 17 ·
Undergrad Dot product of two vector operators in unusual coordinates
- Old Person
- · Replies 14 ·
Undergrad Schwinger-Dyson equations derivation
- simonjech
- · Replies 3 ·
Graduate Learning DFT: Inhomogeneous Electron Gas (Hohenberg) Question
- yosty222
- · Replies 1 ·
Undergrad Finding ##\partial^\mu\phi## for a squeezed state in QFT
- Sciencemaster
- · Replies 2 ·
Undergrad Free particle probability distribution
- zekise
- · Replies 22 ·
Undergrad States of equal energy are equally probable
- msumm21
- · Replies 29 ·
Undergrad Do electrons diffract and create interference patterns in single-slit experiments?
- Mustafa Bayram
- · Replies 6 ·
High School Is there a fractional frequency of light?
- Mustafa Bayram
- · Replies 9 ·
Undergrad Limit of quantum mechanics as h -> 0
- offscene
- · Replies 6 ·
Graduate Schrodinger equation in quantum field theory
- accdd
- · Replies 8 ·
Undergrad Derivation of two-electron density operator
- Mart1234
- · Replies 3 ·
Undergrad Integration of Bessel function products (J_1(x)^2/xdx)
- euphoricrhino
- · Replies 1 ·
Undergrad Angular momentum and rotations
- Kashmir
- · Replies 4 ·
High School Electrons at Absolute Zero -- do they still move?
- Vectronix
- · Replies 11 ·
Graduate Found a new formula of Dirac calculus
- Demystifier
- · Replies 7 ·
Graduate Eigenvalue Problem of Quantum Mechanics
- CuriousLearner8
- · Replies 6 ·
Undergrad The clarity of Heisenberg uncertainty
- Narasoma
- · Replies 18 ·
Undergrad Approach to extrapolate a "superpositioned" wave?
- ironhak
- · Replies 27 ·
Graduate What is meant when a phase is said to have "symmetry protected"?
- physics2023
- · Replies 6 ·
Undergrad Particle ontology in QFT: Reeh-Schlieder, Unruh effect, and Haag's theorem
- lindberg
- · Replies 12 ·
Undergrad How to define expectation value in relativistic quantum mechanics?
- Foracle
- · Replies 2 ·
Undergrad Why is quantum mechanics not valid for large objects?
- John Mcrain
- · Replies 15 ·
Undergrad Observer effect in the Dual Slit experiment
- John Mcrain
- · Replies 6 ·
Undergrad How does EM wave geometrical attenuation affect atomic absorption?
- Leureka
- · Replies 3 ·
Graduate The eigenvalue power method for quantum problems
- hilbert2
- · Replies 2 ·
High School Difference between quantum connection and entanglement
- louislaolu
- · Replies 11 ·
High School What is the difference between a wave and a field?
- Kenneth Boon Faker
- · Replies 13 ·
Undergrad The electron as a smeared charge density
- physwiz222
- · Replies 13 ·
Undergrad Symbol meaning in CP-violating angle
- Ranku
- · Replies 1 ·
Undergrad Do atoms recoil when emitting a photon?
- sol47739
- · Replies 38 ·
Undergrad How certain is the uncertainty principle?
- dsaun777
- · Replies 10 ·
Graduate Solving the Radial Equation for the Dirac Hydrogen Atom Solution
- topsquark
- · Replies 10 ·
Undergrad Is Brownian motion a purely classical phenomenon or is it also quantm?
- Aidyan
- · Replies 2 ·
High School Spin And Angular Momentum of Large Objects
- Hornbein
- · Replies 2 ·
Undergrad Two hydrogen atoms and Pauli's exclusion principle
- josemi_guelll
- · Replies 17 ·
Undergrad Understanding tensor product and direct sum
- dwd40physics
- · Replies 11 ·
Graduate Can four electrons form a completely antisymmetric joint spin WF？
- edpmodel
- · Replies 16 ·
Graduate Heavy Quark Propagators in HQET
- Elmo
- · Replies 1 ·
Graduate Scalar decay to one-loop in Yukawa interaction
- Gaussian97
- · Replies 4 ·
Undergrad Does there exist momentum-shift operator?
- PRB147
- · Replies 3 ·
Undergrad Can a bound state in a finite well have energy equal to V0?
- Coelum
- · Replies 12 ·
High School Delayed choice experiment and FTL communication
- cala
- · Replies 15 ·
Undergrad Construction of an Entangled Photon Source
- Marilyn67
- · Replies 18 ·
Graduate Ballentine on the "multicomponent state function"
- EE18
- · Replies 1 ·
Graduate Ballentine on Diffraction Scattering
- EE18
- · Replies 4 ·
Undergrad Does a bra represent wavefunction values in coordinate basis?
- olgerm
- · Replies 10 ·
Undergrad Parameter Integration of Bubble Integral
- Elmo
- · Replies 2 ·
Undergrad Velocity operator, its expression and eigenvalues
- Kashmir
- · Replies 27 ·
Graduate Understanding time translations in Ballentine
- EE18
- · Replies 2 ·
Undergrad How can multiple entangled Qubits be represented and visualized?
- pervect
- · Replies 2 ·
Undergrad QFT vs GR Cosmological Constant
- dsaun777
- · Replies 15 ·
Undergrad What are the units of the squeezing parameter?
- Sciencemaster
- · Replies 8 ·
Undergrad (extended) Page-Wootters formalism
- Heidi
- · Replies 14 ·
Graduate Decoherence in the Heisenberg Picture
- LittleSchwinger
- · Replies 1 ·
High School What is a photon's structure composed of?
- lighthouse1234
- · Replies 6 ·
High School Is the photon a gauge boson for neutrinos?
- MichPod
- · Replies 20 ·
High School Does DCQE show a shift between the two "which path" results?
- Rene Dekker
- · Replies 9 ·
Graduate Heisenberg picture and Path integrals (Zee QFT)
- qft-El
- · Replies 15 ·
High School Are electrons in atoms always in eigenstates?
- snoopies622
- · Replies 6 ·
Undergrad Experiment with gamers, random numbers and entanglement
- Spathi
- · Replies 5 ·
Undergrad Why is the minimum energy equal to the energy uncertainty?
- asdf
- · Replies 3 ·
Undergrad Applications of the Pauli matrix identity (σ·A)(σ·B) = A·B + iσ·(A×B)
- topsquark
- · Replies 2 ·
High School The energy of a molecule has what sign?
- Lotto
- · Replies 3 ·
Undergrad What is an observable exactly?
- dsaun777
- · Replies 3 ·
Undergrad Global evolution of a Bell pair of photons
- Heidi
- · Replies 6 ·
Undergrad Does the uncertainty principle explain high energy density near the big bang?
- victorvmotti
- · Replies 1 ·
Undergrad Intuition for why linear algebra is needed in quantum physics
- Shirish
- · Replies 7 ·
Undergrad Laser and hair - scattering or destructive interference?
- Spathi
- · Replies 4 ·
Undergrad Are the proton and electron quantum entangled in the hydrogen atom?
- Stevexyz
- · Replies 4 ·
Graduate Creating Schrödinger cat states in circuit QED with displacement operators
- physicsclaus
- · Replies 16 ·
High School For what elements does Born–Oppenheimer approximation fail the most?
- Lotto
- · Replies 1 ·
Graduate Maxwell theory invariant under dual field strength tensor application
- Mark99
- · Replies 3 ·
Undergrad Two Entropy scenarios on a system
- MatthewKM
- · Replies 4 ·
Undergrad Can the Transverse Nature of a Wave from an Electron Gun be Observed?
- Martyn Arthur
- · Replies 13 ·