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 LS vs jj couplings and their selection rules
- bentzy
- · Replies 3 ·
Undergrad Why is quantum field theory undefined in 3+1 dimensions?
- HomogenousCow
- · Replies 11 ·
Undergrad What is attosecond physics?
- mamdouh
- · Replies 3 ·
Undergrad Time evolution of an expectation value
- jaurandt
- · Replies 12 ·
Undergrad Measuring the number of waves in photon wave packets
- exmarine
- · Replies 1 ·
Insights 9 Reasons Quantum Mechanics is Incomplete - Comments
- Demystifier
- · Replies 118 ·
Undergrad What is "to the first order in H"?
- Haorong Wu
- · Replies 8 ·
Undergrad Does quantum gravity blur the inverse square law at extreme distances?
- sderamus
- · Replies 3 ·
Undergrad Is quantum mechanics deterministic if measurement effects occur naturally?
- Pleonasm
- · Replies 30 ·
Undergrad Can a single photon decay into three photons via QED?
- maline
- · Replies 22 ·
Undergrad Why no position operator for photon?
- LarryS
- · Replies 35 ·
Undergrad Single ket for a product of two wave functions
- Amentia
- · Replies 5 ·
Undergrad Doesn't the atom in ground state radiate?
- thaiqi
- · Replies 3 ·
Undergrad Confusion on binding energy and ionization energy.
- Cedric Chia
- · Replies 3 ·
Graduate Can we have a proton and an antiproton in the 1^S_0 atomic orbital
- Jamiemma1995
- · Replies 2 ·
Undergrad Which-path info exists = deterministic context?
- CHOP
- · Replies 29 ·
High School Is quantum superposition the same as regular superposition in physics?
- Bianca Meske
- · Replies 1 ·
Undergrad Clarifying causes of correlations
- vanhees71
- · Replies 13 ·
High School Particle properties conclusion from no-slit diffraction
- roineust
- · Replies 3 ·
High School How do I explain quantum superposition?
- Bianca Meske
- · Replies 4 ·
Undergrad Taylor expanding 1D scattering coefficient integral around k₀
- WWCY
- · Replies 6 ·
Undergrad Locality and Wave Function Collapse Implications
- The Head
- · Replies 8 ·
Undergrad Non-degeneracy of the quantum harmonic oscillator spectrum
- Lebnm
- · Replies 3 ·
Undergrad Particle in a box experiment confirmation
- ftr
- · Replies 6 ·
Graduate Why must pilot-wave mechanics be stochastic on a discrete spacetime lattice?
- Ali Lavasani
- · Replies 2 ·
High School What makes photons from a laser cavity so directional?
- intervoxel
- · Replies 5 ·
Insights Wigner's friend thought experiment
- RUTA
- · Replies 33 ·
Undergrad Can Two Particle-in-a-Box Systems Interact to Affect Entropy?
- WombatWithANuke
- · Replies 3 ·
Undergrad Very simple explanation of Wigner's friend needed
- idea2000
- · Replies 1 ·
Insights A First Idea of Quantum Field Theory - 20 Part Series - Comments
- Urs Schreiber
- · Replies 9 ·
Graduate Why does LS coupling apply to light atoms and jj coupling to heavy atoms?
- bentzy
- · Replies 6 ·
Undergrad Two identical spin 1/2 particles
- Lebnm
- · Replies 1 ·
Graduate Path Integral Approach To Derive The KG Propagator
- Woolyabyss
- · Replies 4 ·
Undergrad Trouble with cubical cavity radiation
- GhostLoveScore
- · Replies 3 ·
Undergrad New book on the foundations of quantum mechanics
- ttn
- · Replies 14 ·
High School Taking Quantum Computers into Space
- happyhacker
- · Replies 13 ·
Undergrad Double slit interactive detector
- CHOP
- · Replies 3 ·
Undergrad Calculating the number of energy states using momentum space
- JohnnyGui
- · Replies 153 ·
Undergrad Divergent vacuum uncertainty of fields in QFT, how to resolve?
- HomogenousCow
- · Replies 18 ·
Undergrad Confusion about the Concept of Operators
- jdou86
- · Replies 14 ·
Undergrad Space is discrete or continuous?
- Philipsmett
- · Replies 2 ·
High School Is Born's rule really verified?
- Dimosthenis76
- · Replies 14 ·
Undergrad How to quantum mechanically describe the photon?
- Somali_Physicist
- · Replies 14 ·
High School Are there unverifiable assertions about probabilities
- jk22
- · Replies 4 ·
Undergrad Does String Theory Justifiably Extend Gravitational Laws to Sub-Planck Lengths?
- john t
- · Replies 1 ·
Undergrad Normalisation constant for identical particles
- WWCY
- · Replies 1 ·
High School Why is L=2 not acceptable for carbon according to Hund's second rule?
- Haorong Wu
- · Replies 3 ·
Undergrad Does Quantum Mechanics Suggest a Conservation of Possibilities?
- entropy1
- · Replies 1 ·
Undergrad The Planck length and string theory
- john t
- · Replies 5 ·
Undergrad Arrow of time and its reversal on a IBM quantum computer
- andrew s 1905
- · Replies 5 ·
Undergrad Relation between spectral radiance and density of cavity
- Jhordan
- · Replies 7 ·
Undergrad Does Grover's algorithm require knowing the answer to find it?
- QComp
- · Replies 13 ·
Undergrad Will quantum computation lower energy requirements?
- QGrav
- · Replies 4 ·
Undergrad Entanglement vs. Coherence in SPDC
- Erik Ayer
- · Replies 20 ·
High School Delayed choice quantum communication - "Berlin riddle"
- Bob Ziegler
- · Replies 1 ·
Undergrad Deriving the Maxwell tensor identity in Schwartz 8.23
- dm4b
- · Replies 3 ·
Undergrad Why does the uncertainty principle drop the anti-commutator term?
- dyn
- · Replies 15 ·
Undergrad Vacuum projection operator and normal ordering
- "Don't panic!"
- · Replies 19 ·
Undergrad Solving Quantum Mechanics Integral Equation: How to Get from (1) to (2)?
- physics bob
- · Replies 4 ·
Undergrad General solution to the Time-independent Schrödinger equation?
- greswd
- · Replies 8 ·
Undergrad Against Collapse: A Mathematical Argument
- Peter Morgan
- · Replies 4 ·
Graduate Has the 2-stage Stern-Gerlach experiment been performed?
- Ali Lavasani
- · Replies 2 ·
Graduate Renormalization (Electron self energy)
- Aleolomorfo
- · Replies 4 ·
Undergrad Fermi's golden rule 2E factors in QFT cross sections
- tomdodd4598
- · Replies 1 ·
Undergrad The (quantum) world existing AND non-existing
- entropy1
- · Replies 1 ·
Undergrad David Deutsch (1985) attempt to solve the incoherence problem
- jxcs
- · Replies 2 ·
Undergrad What Is the Empty Space in the Double Slit Experiment's Interference Pattern?
- Sdog
- · Replies 7 ·
Undergrad Weak interaction between electrons
- Philipsmett
- · Replies 5 ·
Undergrad Spin matrices and Field transformations
- Markus Kahn
- · Replies 3 ·
Undergrad Symmetries in quantum mechanics and the change of operators
- Lebnm
- · Replies 3 ·
Graduate Haag's Theorem and the Poincare Group
- DarMM
- · Replies 29 ·
Undergrad Why does a phonon bend away from gravity if it has positive mass?
- snorkack
- · Replies 15 ·
High School Instant Quantum Communicator: Does Time Dilation Affect Voice?
- KaiEris
- · Replies 4 ·
Insights A Classical View of the Qubit - Comments
- A. Neumaier
- · Replies 2 ·
Undergrad Momentum of a stationary particle/wave?
- Philip Land
- · Replies 36 ·
Undergrad Can the quantum eraser work without coincidence?
- Erik Ayer
- · Replies 1 ·
Undergrad Should initial and final states be mixed states in the trace formula?
- jk22
- · Replies 2 ·
High School Does the brain use quantum mechanics?
- Demirci Kawa
- · Replies 17 ·
Graduate Concepts in a quantum synchronization setup
- Danny Boy
- · Replies 1 ·
Undergrad How can one know the initial state from measurements?
- pellman
- · Replies 4 ·
Graduate Multiverse vs Ugliverse vs Quantum Monism
- jedishrfu
- · Replies 3 ·
Graduate Photon Spin and Polarization filters
- PavanKumar
- · Replies 5 ·
Undergrad Newtonian Gravity Vs. Quantum Gravity
- Quantum Physics
- · Replies 1 ·
High School Quantum entanglement mechanics
- cHaRLie Bi0NiC
- · Replies 3 ·
Undergrad Continuous variable entanglement
- WWCY
- · Replies 1 ·
Graduate Understanding Goldstone's Theorem Proof: Volume Limit and Commutator
- Aleolomorfo
- · Replies 1 ·
Undergrad Difference between spin repulsion and electrostatic repulsion of an electron?
- Philipsmett
- · Replies 1 ·
Graduate The relationship between random fields and quantum fields
- Peter Morgan
- · Replies 1 ·
Undergrad Particle in a box and quantization of energy
- Alan Ezra
- · Replies 15 ·
Undergrad The Classical Limit of Maxwell-Boltzmann Distribution
- JohnnyGui
- · Replies 2 ·
Undergrad Ab Initio methods for chemical reactions?
- jonjacson
- · Replies 20 ·
Undergrad Is it possible to detect an electrostatic field?
- Philipsmett
- · Replies 1 ·
Undergrad Does wave superposition consume time?
- LarryS
- · Replies 1 ·
Undergrad Why can't an electron be spinning?
- Vampyr
- · Replies 2 ·
Undergrad Why are photoelectric measurements sensitive to surface properties?
- Gerlan Silva
- · Replies 3 ·
High School Quantum field theory and the collapse of the wave function
- Joao
- · Replies 2 ·
Undergrad Franson interferometer: Entanglement?
- greypilgrim
- · Replies 3 ·
Graduate Frequency threshold in the photoelectric effect
- Gerlan Silva
- · Replies 10 ·
Undergrad Superposition Analogy: Ceiling Fan Spin Beyond 15,000 RPM
- ScienceMike33
- · Replies 4 ·
Undergrad Parity operator and a free particle on a circle
- dyn
- · Replies 57 ·