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 Why are low-l states lower in energy than hydrogen while high-l states are nearly equal?
- albertsmith
- · Replies 5 ·
Graduate Adding Spin S1 and S2: A Puzzling Situation
- dsr39
- · Replies 4 ·
Graduate Wall Street Journal on Entanglement
- DrChinese
- · Replies 6 ·
Undergrad What are orthogonal wavefunctions?
- lms_89
- · Replies 3 ·
Graduate Can quantum entangled particles be used for faster-than-light communication?
- Belzy
- · Replies 5 ·
Graduate Product state and orthorgonality
- KFC
- · Replies 2 ·
Graduate The probe passes over an atom that is 3.20×10^2 nm tall.
- albertsmith
- · Replies 4 ·
Graduate Explaining the Hydrogen Atom Wave Function Paradox
- albertsmith
- · Replies 2 ·
Undergrad How does the uncertainty principle work?
- vizzard
- · Replies 9 ·
Graduate Preparing a certain superposition of electron states
- thoughtgaze
- · Replies 1 ·
Graduate Is the vacuum the same as a quantum vacuum?
- redhedkangaro
- · Replies 5 ·
High School How Are Math and Science Interconnected?
- Matterwave
- · Replies 4 ·
Graduate Commutators of Lorentz generators
- nrqed
- · Replies 5 ·
Graduate What's the Difference Between Quantum and Simple Harmonic Oscillators?
- Thierry12
- · Replies 2 ·
Graduate Do frequency operators predict measurement results in superposition states?
- Fredrik
- · Replies 5 ·
Graduate Can the Commutator of Charges in QFT be Calculated Using Different Times?
- nrqed
- · Replies 5 ·
Graduate Can Electrons Change Spin Sign?
- o_neg
- · Replies 4 ·
Graduate What is the precise definition of a bound state?
- OB1
- · Replies 5 ·
Graduate Understanding Dihydrogen Spin Isomers: An Overview and Explanation
- splitringtail
- · Replies 1 ·
Graduate Is a quantum system completely defined by its spectrum?
- zetafunction
- · Replies 2 ·
Graduate The Heisenberg Uncertainty Principle and velocity
- hover
- · Replies 1 ·
Graduate Is Quantum Metaphysics Bridging Science and Spirituality Beyond Space and Time?
- redhedkangaro
- · Replies 1 ·
Graduate Virtual Particles: Disproving Energy Conservation?
- sandstorm
- · Replies 2 ·
High School Atomic Vibration Speed: m/s Conversion
- nocoolnames
- · Replies 3 ·
Graduate Wave-particle duality and the photo-electric effect
- NanakiXIII
- · Replies 2 ·
Undergrad Property that gives electrons charge.
- harkkam
- · Replies 4 ·
Undergrad How an electron can re-radiate an electromagnetic wave
- Thierry12
- · Replies 4 ·
Graduate What Temperature Yields a 25% Population Probability at 7.00 eV in Copper?
- viviane363
- · Replies 1 ·
Graduate Could almost nothing really be something? Fourier series.
- Spinnor
- · Replies 6 ·
Graduate Why are KμKμ and KνKν terms absent from equation 3.11?
- Fredrik
- · Replies 2 ·
Graduate Critical temperature of a superconductor
- viviane363
- · Replies 6 ·
Graduate Double Slit Experiment Near The Singularity of a black hole
- TomBombadil7
- · Replies 4 ·
Graduate How come there is a particle with zero mass?
- VodaVoda
- · Replies 4 ·
Graduate Can fermion fields in QFT have dimensions other than 3/2 and 1/2?
- fermi
- · Replies 5 ·
Graduate Does the lowering operator give a|0> = |0> or a|0> = 0?
- KFC
- · Replies 10 ·
Graduate How to operate on product state?
- KFC
- · Replies 2 ·
Graduate How Does Anti-Commutativity Affect Grassmann Number Integration?
- pellman
- · Replies 4 ·
Graduate Is the Multi-Electron Wavefunction Truly Separable?
- sokrates
- · Replies 3 ·
Graduate Density Matrix in that DFT bible book
- wolich22
- · Replies 1 ·
Graduate Did the Quantum Field Exist at the Beginning of Time and Space?
- redhedkangaro
- · Replies 1 ·
Graduate Meaning of Expectation Values for <x^2> and <p^2> in Classical Mechanics
- 13characters
- · Replies 4 ·
Graduate Practical examples of superposition?
- ayladarcy
- · Replies 3 ·
Graduate Stationary schrodinger equation (basic problems regarding the basis being used)
- roya
- · Replies 3 ·
Graduate What Is the Root of Number Operator in Quantum Mechanics?
- KFC
- · Replies 1 ·
Graduate Second quantization and partial traces
- ledamage
- · Replies 3 ·
High School What is the difference between quantum mechanics and quantum physics?
- dealrocker
- · Replies 3 ·
Graduate Schrodinger Equations - wave propagation
- krindik
- · Replies 8 ·
Undergrad Why Does Quantum Mechanics Depend on Probability?
- Pjpic
- · Replies 1 ·
Graduate Formulation of Quantum Mechanics?
- vizzard
- · Replies 4 ·
Graduate Tunneling effect in Supercapacitors ?
- Hans Peter
- · Replies 1 ·
Graduate Can Quantum Mechanics Enlighten My Philosophical Ideas?
- Cuban Lincoln
- · Replies 7 ·
Graduate Systems with global phase invariance, 3D string?
- Spinnor
- · Replies 5 ·
Graduate Understanding Inelastic Collisions in Helium at Room Temperature
- conway
- · Replies 7 ·
Graduate Studying the Zeeman Effect on Molecules
- hagopbul
- · Replies 1 ·
Graduate What is the paradox in Planck's Law?
- cmos
- · Replies 62 ·
Undergrad Encryption v.s. quantum computers
- ktoz
- · Replies 26 ·
Undergrad Why is gold's color different from other metals?
- dishku
- · Replies 2 ·
Graduate SU(2) Spinor: Is Product of Two Scalar-Type Entity?
- div curl F= 0
- · Replies 1 ·
Graduate Why would entangled particles light years away need to be able to cancel?
- Green Zach
- · Replies 6 ·
Graduate Why does the infinite square well from -a to +a have cosine solutions?
- mr_whisk
- · Replies 3 ·
Graduate The smallest measurement device
- Dmitry67
- · Replies 8 ·
Undergrad Fourier transform and uncertainity principle
- likephysics
- · Replies 9 ·
Graduate Can photons collide with each other to produce new particles?
- misnoma
- · Replies 24 ·
Graduate Quantum-classical correspondence?
- xylai
- · Replies 41 ·
Graduate Harmonic Oscillator energy = WKB approximate energy why?
- maverick280857
- · Replies 3 ·
Graduate Solving KET-BRA Notation in OPW Solid State Physics
- asifmumtaz
- · Replies 2 ·
Graduate Why do molecules not fall apart under observation?
- The thinker
- · Replies 1 ·
Graduate Why do high energies correspond to small distances
- RedX
- · Replies 2 ·
Undergrad Does the Casimir Effect Occur in Space?
- monty37
- · Replies 1 ·
Graduate Do ghosts and gauge-fixing break gauge invariance in QFT?
- RedX
- · Replies 4 ·
Graduate Can you multiply two bra-ket expressions like < r | j >< a | j >?
- chemstudent09
- · Replies 8 ·
Graduate The Impact of Weak Realism on Bell's Theorem and Bohmian Interpretations
- Ilja
- · Replies 64 ·
Graduate Time Dependent Schrodinger Equation -> T(t) solution
- karkas
- · Replies 13 ·
Graduate Introductory books on quantum mechanics
- mvillagra
- · Replies 3 ·
Graduate Dirac's Coupling to an electromagnetic field and schroedingers
- g.bashyam
- · Replies 2 ·
Graduate Dot product of two pauli matrices
- KFC
- · Replies 5 ·
Graduate Why Do Photons Follow a Sine Wave Pattern Instead of Other Paths?
- taylaron
- · Replies 2 ·
Graduate U(1):?:SU(3) 1D:2D:3D harmonic oscillator.
- Spinnor
- · Replies 2 ·
Graduate 3-d harmonic oscillator and SU(3) - how to imagine it?
- franoisbelfor
- · Replies 4 ·
Graduate Energy Conservation in an expanded 1D box
- dLo R6
- · Replies 3 ·
Graduate Does quantum mechanical definition of momentum require movement ?
- feynmann
- · Replies 21 ·
Graduate Copenhagen interpretation of Quantum Theory
- quddusaliquddus
- · Replies 49 ·
Graduate Hydrogen spectrum hyperfine structure
- edguy99
- · Replies 1 ·
Graduate Classical counterpart of the quantum |nlm> states
- wdlang
- · Replies 1 ·
Graduate What Causes the Expansion of Our Universe?
- saylem
- · Replies 30 ·
Graduate Choice of source photon production in entanglement experiments
- moving_on
- · Replies 2 ·
Graduate Does the Hartree Approximation Ignore Electron Interactions?
- chemstudent09
- · Replies 1 ·
Graduate Explaining quantum coherence to non-physicists
- Einstein Mcfly
- · Replies 1 ·
Graduate Velocity, density, ect. : air : molecules spinor field :?:?
- Spinnor
- · Replies 3 ·
Graduate What exactly is an oscillator in quantum physical context?
- Masna
- · Replies 3 ·
Graduate Has entanglement in quantum physics been experimentally validated?
- SDetection
- · Replies 30 ·
Graduate Does quantized spacetime reduce the number of spatial dimensions?
- theneedtoknow
- · Replies 4 ·
Graduate Elementary Particles with Zero Spin?
- LarryS
- · Replies 1 ·
High School Drawbacks of bohr's model of atom
- roshan2004
- · Replies 1 ·
Graduate How do you transition from the QED Lagrangian to classical electrodynamics?
- Ben Niehoff
- · Replies 5 ·
Graduate Why No Decoherence in Double Slit Experiment?
- Feeble Wonk
- · Replies 7 ·
Undergrad Why the Rutherford model can't explain hydrogen line spectra
- roshan2004
- · Replies 22 ·
Graduate Does QCD need the Lambda parameter outside perturbation theory?
- fermi
- · Replies 4 ·
High School Converting frequency to energy with Planck's equation
- Hertz
- · Replies 5 ·
Graduate Wave propagation, +z or -z
- sokrates
- · Replies 1 ·