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 Covariance Matrices and Standard form
- Ken Gallock
- · Replies 1 ·
Undergrad Problem with classical electrostatic potential energy
- zonde
- · Replies 3 ·
Undergrad Do identical particles really exist?
- LarryS
- · Replies 13 ·
High School How do we maintain a system in a non-dertministic state?
- Grinkle
- · Replies 3 ·
Undergrad Finding de Broglie's Original Paper on Matter Waves
- Sandeep T S
- · Replies 4 ·
Graduate Scalar-scalar scattering Feynman diagram
- Glenn Rowe
- · Replies 7 ·
Graduate (How) Does TQFT actually describe a physical theory?
- NathanaelNolk
- · Replies 1 ·
Undergrad The energy-time uncertainty principle
- eprparadox
- · Replies 20 ·
High School Do fractional spins like 4/5 exist?
- jk22
- · Replies 2 ·
Graduate Evolution operator in QFT - why Schrodinger?
- Glenn Rowe
- · Replies 24 ·
High School How long does it take to detect entanglement?
- platosuniverse
- · Replies 7 ·
Undergrad Entanglement correlations vs. timelike measurement events?
- LarryS
- · Replies 7 ·
Undergrad Quantum Field Energy: What Happens When it Tends to Zero?
- James Slater
- · Replies 7 ·
Undergrad Alternative formula for the Hamiltonian
- grzz
- · Replies 8 ·
High School Is String Theory Built On Funny Math?
- bhobba
- · Replies 17 ·
Undergrad Why do photons lose energy due to the emitter's velocity?
- gmalcolm77
- · Replies 5 ·
High School In parallel universes, everything that can happen happens, but why?
- empleat
- · Replies 6 ·
Undergrad How the wavelength of a photon is measured experimentally?
- Sandeep T S
- · Replies 4 ·
Graduate Quantum Mechanic Symposium London
- QuantPhy
- · Replies 1 ·
Undergrad Particle Physics and Quantum Mechanics
- crastinus
- · Replies 4 ·
High School Ways to understand the delayed entanglement swapping
- Joao
- · Replies 23 ·
Undergrad Lorentz Invarience and Spontaneous Symmetry Breaking
- Hot stuff
- · Replies 1 ·
High School Is the electron of Phosphorus entangled with its nucleus?
- Laith1
- · Replies 4 ·
Graduate Quantum electrodynamics and the brain
- Anne Ross
- · Replies 3 ·
Undergrad Total spin in multiparticle system
- hideelo
- · Replies 1 ·
Undergrad Derivation of the partition function
- Mentz114
- · Replies 5 ·
Undergrad Eigenkets belonging to a range of eigenvalues
- Spin One
- · Replies 4 ·
Undergrad Can field energy transfer between fields during interactions in QFT?
- asimov42
- · Replies 14 ·
Graduate TD perturbation - state initially in continuous part
- Nemanja989
- · Replies 49 ·
High School Does Locality in Quantum Mechanics Exclude Retrocausality?
- entropy1
- · Replies 44 ·
Undergrad Prove that TDSE is invariant under Galilean Transformation.
- Viraj Daniel Dsouza
- · Replies 5 ·
High School Why position and momentum cannot be simultaneously specified in quantum theory
- PGaccount
- · Replies 16 ·
Graduate Violating conservation of momentum and its resolution
- jfizzix
- · Replies 10 ·
Undergrad How Long Does a Particle Stay in a Quantum Potential Well?
- andrewtz98
- · Replies 1 ·
Graduate A paradox for bosons with non-degenerate states?
- Philip Koeck
- · Replies 12 ·
High School Transfering spin onto a macroscopic object
- SlowThinker
- · Replies 28 ·
Undergrad Can you hermitianly conjugate both sides of a bra-ket equation?
- Somali_Physicist
- · Replies 5 ·
High School How to shorten this speech about BH?
- avischiffman
- · Replies 28 ·
High School What is quantum entanglement and how it effects the space-time
- Dhruv007
- · Replies 16 ·
Undergrad What is a Gaussian Wave Packet?
- William Estlick
- · Replies 3 ·
Undergrad Energy measurement on superposition of states
- eprparadox
- · Replies 10 ·
Graduate What is the significance of the variable lambda in Bell's locality assumption?
- martinbn
- · Replies 25 ·
Graduate Deriving equation 11 from the Keldysh rotation
- Christian_K_K
- · Replies 6 ·
Graduate Is there an Expression for Entropy of Fermions or Bosons?
- Philip Koeck
- · Replies 7 ·
Undergrad Understanding particle/wave duality and the Wave Function
- Kvothecomplex
- · Replies 7 ·
Graduate Restricted Open Shell Hartree Fock Method
- twist.1995
- · Replies 1 ·
Undergrad Interval in Quantum Mechanics?
- kent davidge
- · Replies 9 ·
Undergrad What an electron in an atom will do when given more energy
- Ahsan Khan
- · Replies 8 ·
High School Quantum Field Theory and Electrcity
- arnoldcena3000
- · Replies 1 ·
Undergrad Quantum Field Theory -- Does electron have infinity size?
- arnoldcena3000
- · Replies 2 ·
Graduate Rigged Hilbert Spaces In Quantum Mechanics
- bhobba
- · Replies 19 ·
Graduate Quantum Field Theory. Electric discharge
- arnoldcena3000
- · Replies 9 ·
Undergrad What is the Difference between the lottery and QM?
- JohnSmart
- · Replies 19 ·
Graduate Is Chapter 5's Approach to the Photoelectric Effect Unique in QFT Literature?
- bolbteppa
- · Replies 5 ·
Undergrad Double slit experiment with one observer measuring which slit
- GiuseppeP
- · Replies 15 ·
High School Why doesn't the plate interact with the particle in double slit?
- platosuniverse
- · Replies 47 ·
Undergrad Physical meaning of the identity matrix as an observable in quantum mechanics
- Marrrrrrr
- · Replies 3 ·
Undergrad Is information lost in wavefunction collapse?
- MichPod
- · Replies 129 ·
Graduate Rigorous transition from discrete to continuous basis
- Alex Cros
- · Replies 2 ·
Undergrad How to think about partially entangled states
- zonde
- · Replies 19 ·
High School Photon reflection probability in quantum electrodynamics
- Marc_72
- · Replies 2 ·
Undergrad Nonrelativistic limit of scalar field theory
- stevendaryl
- · Replies 2 ·
Undergrad What does the Klein-Gordon equation mean for field operators in QFT?
- Silviu
- · Replies 37 ·
Undergrad Expectation for the Harmonic Oscillator ( using dirac)
- Somali_Physicist
- · Replies 5 ·
Undergrad How Does the Heisenberg Uncertainty Principle Relate to Statistics?
- Erribert
- · Replies 17 ·
Graduate Weinberg's massless field coefficient relation in QFT Vol 1
- hgandh
- · Replies 3 ·
Graduate Classical uncertainty principle
- Jeffrey Freed
- · Replies 3 ·
Graduate Commutation relations for bosons and fermions
- Higgsono
- · Replies 3 ·
Undergrad Spin conservation in the Dirac equation
- chingel
- · Replies 5 ·
Graduate Null measurement in the which-path experiments
- Rob Field
- · Replies 12 ·
Graduate Quantizing the complex Klein-Gordon field
- Nauj Onerom
- · Replies 2 ·
Undergrad Wave function collapse and measurement rule
- emdezla
- · Replies 4 ·
High School Does Schrödinger's cat apply only to quantum systems?
- BernieM
- · Replies 30 ·
Undergrad Finite square well bound states
- andrewtz98
- · Replies 1 ·
High School Conjugation , involving operators in Dirac Notation.
- Somali_Physicist
- · Replies 4 ·
Undergrad Are basis states or superpositions considered qubits in a two-level system?
- eprparadox
- · Replies 3 ·
Undergrad How Does Measurement Affect Uncertainty in Quantum Mechanics?
- dRic2
- · Replies 8 ·
Undergrad Quantum Computing and Superposition of states
- eprparadox
- · Replies 5 ·
Undergrad Is consciousness necessary to collapse the wave function?
- deathonimpact
- · Replies 15 ·
Undergrad Momentum/Position space wave function
- WeiShan Ng
- · Replies 3 ·
Undergrad Can Quantum Entanglement Be Used to Transfer Information?
- niko_.97
- · Replies 3 ·
High School Why does Pm² = Pm if |m|² · |m|² = |m|⁴?
- Somali_Physicist
- · Replies 10 ·
Undergrad Detailed derivation of GHZ theorem for 3 particles
- facenian
- · Replies 2 ·
Undergrad What is the physical meaning of Bogoliubov transformation?
- patric44
- · Replies 7 ·
Undergrad Definition and Rules of Quantum State Observation
- Jarvis323
- · Replies 1 ·
High School Photon particle independent of wave question
- kurt101
- · Replies 21 ·
Graduate Atomic state that is a coherent superposition?
- meyol99
- · Replies 5 ·
Undergrad Neutrino masses and oscillation
- JMz
- · Replies 15 ·
Undergrad Classical vs quantum probability distribution for the harmonic oscillator
- WeiShan Ng
- · Replies 1 ·
Undergrad Dynamical Casmir Effect in expanding space?
- jcap
- · Replies 1 ·
Undergrad Why does spontaneous emission occur but not spontaneous absorption?
- Silviu
- · Replies 3 ·
Undergrad What does a black hole look like as it evaporates near the end?
- nolxiii
- · Replies 2 ·
Undergrad Commuting observables for Fermion fields?
- maline
- · Replies 4 ·
Graduate Non-Computability of Hidden Variables
- DarMM
- · Replies 7 ·
Undergrad Degenerate Perturbation Theory
- Silviu
- · Replies 7 ·
Undergrad Quantum Scattering Differential Probability
- CDL
- · Replies 1 ·
Undergrad Can Quantum Mechanics Be Both Probabilistic and Deterministic?
- entropy1
- · Replies 22 ·
Undergrad Uncertainty relation derivation
- Somali_Physicist
- · Replies 1 ·
High School Polarization Basis: Measuring Entangled Photons in 45/135
- StevieTNZ
- · Replies 3 ·
Undergrad Two-State Vector Formalism - I like it
- .Scott
- · Replies 1 ·