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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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Quantum Interpretations and Foundations

Particle vs Wave Interpretations of QM
1.3K threads
Undergrad Particle vs Wave Interpretations of QM
Undergrad Partition function of quantum mechanics
  • PGaccount
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Undergrad Clebsch–Gordan coefficients: An Identity
  • victor01
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High School What happens to the uncertainty principle if....
  • borib
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5
Undergrad Probability of finding a particle in a 1-D box max. at centre?
  • Apashanka
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High School Compressing Light: Reflection in Small Gaps
  • Elbraido
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Undergrad Quantum Field Operators for Bosons
  • knowwhatyoudontknow
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High School Question about notation in the Feynman Lectures on Physics III 3-1
  • anuttarasammyak
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High School Why are protons allowed in the nucleus?
  • Andrew Wright
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High School Uncertainty versus impossibility of measurement
  • SamRoss
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Undergrad Can the spin cause the collapse?
  • forofo
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Graduate Should tensor sum be used in matrix mechanics?
  • jk22
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Undergrad Many-Worlds Theory: Simulation Program in C#
  • ShadownightPrograms
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Undergrad Invariance of a system under symmetry operations
  • sophiatev
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14
High School Virtual Particles are not Dark Matter?
  • HexHammer
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9
Undergrad Commutator of ##L^2## with ##L_x,L_y,L_z##...
  • Apashanka
  • · Replies 14 ·
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14
Graduate Understanding how to derive the differential cross-section formula
  • JD_PM
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11
Undergrad The period-finding circuit for Shor's algorithm
  • tomdodd4598
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High School What Is the Occurrence Rate of Path Integral in a Photon Double-Slit Experiment?
  • HexHammer
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6
Graduate Off-diagonal elements in a density matrix
  • CarvalhoGD
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Graduate Relation between Dirac's equation density matrix and current with spin
  • forofo
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1
Insights Clarifying Common Issues with Indistinguishable Particles
  • A. Neumaier
  • · Replies 17 ·
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17
Undergrad Fermi's Golden Rule and the S-matrix
  • tomdodd4598
  • · Replies 5 ·
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5
Undergrad Could Planck-Einstein relation be applied to matter waves?
  • Haorong Wu
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Graduate Zero-point Energy Contribution Below the Planck energy cutoff
  • InconspicuousUnicorn
  • · Replies 1 ·
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Undergrad Understanding the Relationship Between Photon Spin and Polarization Vectors
  • PeroK
  • · Replies 9 ·
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9
Undergrad Could Quantum Physics explain the singularity in a Black Hole?
  • zuz
  • · Replies 6 ·
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6
Graduate 30-day Topological Quantum challenge
  • Replusz
  • · Replies 2 ·
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2
High School Question about squares of operators
  • etotheipi
  • · Replies 17 ·
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17
Undergrad Quantum Spin: Is it Random? Alice & Bob's Test
  • entropy1
  • · Replies 38 ·
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Undergrad Photon Interaction with Environment at Long Range
  • Another
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Undergrad Obtaining the Dirac function from field operator commutation
  • abivz
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2
High School Is Inverse Compton Scattering Related to the Doppler Effect?
  • Daniel Petka
  • · Replies 7 ·
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7
Undergrad Can atoms absorb photons with energy higher than transition energy?
  • Haorong Wu
  • · Replies 4 ·
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4
Graduate Could the fields for the particles and forces have the same origin?
  • Brad12d3
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Undergrad QFT - Field operator commutation
  • abivz
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3
Undergrad Physical meaning of the highest root / weight
  • fresh_42
  • · Replies 53 ·
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Undergrad Interference of a fat laser beam: Tilting wave peaks
  • Erik Ayer
  • · Replies 8 ·
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8
Graduate Quantum Mechanic/wave function/junction condition
  • GreenTea09
  • · Replies 3 ·
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3
Undergrad Single photon double slit experiment
  • Davephaelon
  • · Replies 23 ·
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23
Insights Massive Meets Massless: Compton Scattering Revisited
  • neilparker62
  • · Replies 1 ·
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Undergrad Perturbation Theory and Zeeman Splitting
  • aliens123
  • · Replies 14 ·
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14
Undergrad Visualising an alternative formulation of Planck's Radiation Law
  • TheBigDig
  • · Replies 8 ·
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8
Graduate Exclusion principle in Helium 3
  • EternalStudent
  • · Replies 9 ·
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9
High School Mapping between rules of classical vs QM probability?
  • etotheipi
  • · Replies 6 ·
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Undergrad Single Photon Double Slit Experiment
  • TJonline
  • · Replies 19 ·
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19
Undergrad Quantum Computing: How are quantum properties exploited?
  • expos4ever
  • · Replies 8 ·
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8
Graduate Quantum Field Theory: 3-4 Equation Steps Explained
  • Adwit
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4
Graduate Quantum physics and the theory of evolution
  • Adib Jihad
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2
Graduate Phonons as a quasiparticles in a quantum LHO
  • LagrangeEuler
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Undergrad Why is the term "fluctuations" objectionable?
  • nomadreid
  • · Replies 11 ·
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Graduate Fluctuation in terms of Hilbert space formalsm
  • cyberkatru
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Undergrad Where did I go wrong in deriving quantized energy?
  • SpaceNerdz
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3
Undergrad Quantum Entanglement: What I Know
  • pixel
  • · Replies 11 ·
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Undergrad Parametric down-conversion and double-slits
  • rodd
  • · Replies 1 ·
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1
Undergrad Negative Energy -- Are QI/QEI's Real?
  • cgreeleybsu
  • · Replies 11 ·
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11
Undergrad Lithium Atom Ground State Radial Wavefunction
  • bob012345
  • · Replies 28 ·
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28
Undergrad Is Chemistry the same everywhere?
  • .Scott
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3
High School How much math is required to do QM?
  • entropy1
  • · Replies 19 ·
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Graduate Understanding the Math behind meson decay computations
  • JD_PM
  • · Replies 10 ·
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10
Graduate Why do different regularization schemes give different answers?
  • QFT1995
  • · Replies 5 ·
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5
High School How can the annihilation operator for photons be realized experimentally?
  • jeremyfiennes
  • · Replies 33 ·
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Undergrad Is it possible to explain Quantum tunneling with the HUP?
  • Nam Jeong Woo
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Graduate Why Is the Path Integral W[J] a Vacuum-to-Vacuum Amplitude?
  • PGaccount
  • · Replies 4 ·
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Undergrad Unveiling the Math Behind Potential Well Boundaries
  • DrinkanDerive
  • · Replies 3 ·
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3
Undergrad Number of qubits required for Shor's algorithm to factor a number < 2^n
  • tomdodd4598
  • · Replies 2 ·
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Undergrad Thermal photons emission inside a material
  • Johnny5454
  • · Replies 3 ·
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3
Undergrad Vertex function, quantum action
  • The black vegetable
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Undergrad Finding matrices of perturbation using creation/annihilation operators
  • Keru
  • · Replies 3 ·
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3
High School Calculating Photon Polarization States with PBS & Wave Plates
  • StevieTNZ
  • · Replies 3 ·
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3
Graduate Bremsstrahlung single photon or spectrum
  • gjj
  • · Replies 1 ·
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Undergrad Accuracy of the Density of States
  • JohnnyGui
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Graduate Coherent states: Orthonormal set? Overcomplete basis?
  • LagrangeEuler
  • · Replies 1 ·
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High School Ionization energy and energy levels
  • ilovepudding
  • · Replies 11 ·
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11
Undergrad Group Theory Appearing in Griffith's Elementary Particles (2nd Ed.)
  • Jdeloz828
  • · Replies 20 ·
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Graduate How ‘spooky’ is quantum physics? The answer could be incalculable
  • Demystifier
  • · Replies 24 ·
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Undergrad Why perturbation theory uses power series?
  • Phylosopher
  • · Replies 13 ·
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13
Undergrad Splitting of a one-particle wave function
  • Spacetime walker
  • · Replies 15 ·
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15
Graduate Why is the quantum Fisher information useful in quantum metrology?
  • jamie.j1989
  • · Replies 1 ·
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High School What's the exact point about time travel?
  • Benjamin_harsh
  • · Replies 6 ·
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6
Undergrad (Baby QM) Analytic Solution to the Infinite Square Well Problem
  • obstinatus
  • · Replies 2 ·
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Graduate Decoupled spin vectors A and B
  • filip97
  • · Replies 1 ·
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Graduate How are basis vector relationships defined in incompatible propositions?
  • forkosh
  • · Replies 1 ·
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Undergrad Nomenclature : global or constant phase
  • jk22
  • · Replies 3 ·
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3
Undergrad Fermi's golden rule derivation a bit hazy
  • Replusz
  • · Replies 4 ·
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4
High School Quantum computing -- How is the relevant solution selected?
  • jeremyfiennes
  • · Replies 4 ·
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4
Graduate Does Adding or Removing an Electron Change a Helium-3 Atom to a Boson?
  • hilbert2
  • · Replies 14 ·
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14
Graduate Product of Representations of Lorentz Group
  • filip97
  • · Replies 1 ·
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Graduate Superluminal origin of Quantum Mechanics
  • andresB
  • · Replies 4 ·
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4
Undergrad Thought experiment on photon entanglement
  • Steve Blandford
  • · Replies 14 ·
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14
Undergrad Vacuum amplitudes in \phi^4 theory
  • Replusz
  • · Replies 6 ·
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6
Undergrad Clarification on a statement about spin 1/2 z component related to x and y
  • Sparky_
  • · Replies 32 ·
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Undergrad Commutator with gradient operator (nabla)
  • Replusz
  • · Replies 4 ·
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4
Graduate Algebraic form of Klein Gordon ##\phi^4## vacuum and ladder operators
  • QFT1995
  • · Replies 5 ·
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Undergrad Creation/annihilation operators question
  • Antarres
  • · Replies 5 ·
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5
Undergrad Explaining Time Crystals: Matter, Mass & 4D
  • Quark Effect
  • · Replies 8 ·
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8
Undergrad Quantum Mechanics Particle in a Box
  • umttrb
  • · Replies 11 ·
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11
Graduate Looking Under the Hood of Feynman Diagrams
  • Jdeloz828
  • · Replies 7 ·
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7
Graduate Potential step at a Barrier in Quantum mechanics
  • LagrangeEuler
  • · Replies 6 ·
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6
High School Are all quantum fields coherent?
  • Wave Packets
  • · Replies 14 ·
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14
Graduate Can Bloch Waves Reveal Periodic Potentials in Quantum Mechanics?
  • hilbert2
  • · Replies 10 ·
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