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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High School Photon red shifting and Doppler effect
- Sefer Tov
- · Replies 2 ·
Undergrad Highly localized initial psi in harmonic well
- Swamp Thing
- · Replies 3 ·
Undergrad Does classical physics emerge comprehensibly from quantum mechanics?
- 1977ub
- · Replies 22 ·
High School Counterfactual definiteness and correlation
- entropy1
- · Replies 23 ·
High School Are photons particles or waves?
- Fiziqs
- · Replies 10 ·
Undergrad What determines the charge of a field?
- carllacan
- · Replies 5 ·
Undergrad Why Is the Photoelectric Effect Considered Proof of Light's Particle Nature?
- Dr. Manoj
- · Replies 10 ·
High School I'm conducting an Experiment -- Moving my hand through a wall
- snakelgur
- · Replies 4 ·
Undergrad Schrodinger equation in terms of complex conjugate
- QuantumDuality
- · Replies 2 ·
Undergrad Density of states with delta function
- Arnd Obert
- · Replies 7 ·
High School Where did the energy of red shifted CMB go?
- 1832vin
- · Replies 2 ·
High School Dirac Equation vs Wave Function
- bluecap
- · Replies 1 ·
Graduate Transforming Spin Matrices (Sx, Sy, Sz) to a Spherical Basis
- chi_rho
- · Replies 4 ·
Undergrad Why the tensor product (historical question)?
- greypilgrim
- · Replies 1 ·
Graduate Tunneling photons travel faster than light?
- lmoh
- · Replies 17 ·
High School What does ∇ signify in quantum mechanics?
- entropy1
- · Replies 1 ·
Undergrad Can TSQM Harmonize Free Will, Cause and Effect, and Retrocausality?
- dm4b
- · Replies 4 ·
Undergrad Why do Dirac spinors obey the Klein-Gordon equation?
- carllacan
- · Replies 8 ·
High School Does Bohmian Mechanics Support Counterfactual Definiteness in Its Variants?
- bluecap
- · Replies 2 ·
Undergrad Diagrams for nucleon scattering
- carllacan
- · Replies 3 ·
Undergrad Polarization in laterally moving reference frame
- Swamp Thing
- · Replies 1 ·
High School "no free will" simplest explanation for spooky action?
- DirkMan
- · Replies 20 ·
Undergrad Is radioactive decay independent of the environment?
- Schnellmann
- · Replies 4 ·
Undergrad Why do we differentiate in physics and why twice?
- Physou
- · Replies 3 ·
Undergrad Why can't the real scalar field and the EM be coupled?
- carllacan
- · Replies 10 ·
Undergrad How did Einstein see that Entanglement lead to Connectedness
- LoveQM
- · Replies 8 ·
Undergrad Sum of squares of 2 non-commutating operators
- Swamp Thing
- · Replies 4 ·
Undergrad How reduced density matrix obtained from the matrix.
- munirah
- · Replies 8 ·
High School New particle discovered at 750 GeV at the LHC?
- Justice Hunter
- · Replies 1 ·
Undergrad Determinism, realism, hidden variables
- greypilgrim
- · Replies 208 ·
Graduate What should hidden variables explain?
- naima
- · Replies 72 ·
Graduate Is SU(3) always contains SU(2) groups?
- Ans
- · Replies 3 ·
Undergrad What message would instantaneous signalling convey in nonlocal realism?
- greypilgrim
- · Replies 30 ·
Undergrad Why did Dirac want a first-order equation?
- carllacan
- · Replies 3 ·
Undergrad How do we know the spin of a field?
- carllacan
- · Replies 1 ·
Undergrad Is CPT symmetry violated in beta decay?
- entropy1
- · Replies 2 ·
Graduate Can Relativity Explain Bell's Theorem Without Superluminal Communication?
- Tony Weston
- · Replies 1 ·
High School Probability of finding an electron
- physicsmaths1613
- · Replies 4 ·
Undergrad Is Canonical Momentum conserved?
- LarryS
- · Replies 1 ·
Undergrad Spatial interference fringes in Hong-Ou-Mandel
- Swamp Thing
- · Replies 1 ·
High School Second Law and "Hidden Variables"
- Jimster41
- · Replies 9 ·
High School Can Instruments Alter Wave Functions Across Global Distances?
- bluecap
- · Replies 3 ·
High School 2 questions about the photo electric effect
- Supitha
- · Replies 5 ·
Undergrad How Do Quantum Observables Influence State Collapse?
- Erland
- · Replies 8 ·
Graduate Why must a polar vector parameterized by spinor be timelike?
- EnigmaticField
- · Replies 16 ·
Undergrad Where does Born's rule fit into Rayleigh scattering of skylight?
- Agrippa
- · Replies 9 ·
High School Do Pilot Waves of Apple Resemble an Apple in Configuration Space?
- bluecap
- · Replies 12 ·
Undergrad Can Quantum Tunneling Cause Objects to Instantly Swap Places?
- durant35
- · Replies 2 ·
High School What exactly are waves and how do they look?
- Phys12
- · Replies 8 ·
Undergrad How does measuring spin in arbitrary direction relate to eigenstate equations?
- Muthumanimaran
- · Replies 5 ·
Undergrad Why does a plane wave eigenstate show time-dependent position expectation value?
- Joker93
- · Replies 18 ·
High School Do particles not only exist everywhere but also "everytime"?
- Vampke
- · Replies 3 ·
Undergrad Macro state of a measurement device and correlation
- entropy1
- · Replies 8 ·
Undergrad Electric and Magnetic Fields, Photons, Charges
- Surya97
- · Replies 3 ·
Graduate Where to start with path integral Monte Carlo?
- common_2012
- · Replies 1 ·
Undergrad Physical intuition for the postulates of quantum mechanics
- nashed
- · Replies 130 ·
Undergrad Expectation value of momentum for free particle
- Joker93
- · Replies 8 ·
Graduate Is Quantum Field Theory Still Relevant in Modern Physics?
- Sussan
- · Replies 28 ·
Undergrad Deriving the Proca Lagrangian from the field strength tensor
- decerto
- · Replies 13 ·
Undergrad Why do photons maintain superposition at room temperature but qubits don't?
- Kara386
- · Replies 5 ·
Undergrad Electron wave energies different for +½ and -½ spin?
- Garlic
- · Replies 4 ·
Graduate Refutation of physics in _The Beginning of Infinity_?
- curi
- · Replies 2 ·
High School Derivation of g Factor and Missing Basic Steps in Calculation
- TheCanadian
- · Replies 3 ·
Undergrad Concrete contrast between local and nonlocal hidden variable
- ObjectivelyRational
- · Replies 18 ·
Graduate Why is Spooky Action Necessary?
- vegasgeorge
- · Replies 21 ·
Undergrad Can photons be detected through a slit without destroying the interference pattern?
- athosanian
- · Replies 11 ·
Undergrad Density of states from 3D to 2D
- Matej Kurtulik
- · Replies 2 ·
Undergrad Momentum exchange during diffraction
- Swamp Thing
- · Replies 3 ·
Undergrad Why is the 5 used in the axial Chiral current formulas?
- Pet Scan
- · Replies 7 ·
High School How does the double slit experiment prove super position?
- Liam C
- · Replies 10 ·
High School What are the potential alternatives to traditional teleportation and portals?
- Liam C
- · Replies 8 ·
Undergrad Time dependent perturbation theory
- dyn
- · Replies 2 ·
Graduate Time dependence of field operators
- "Don't panic!"
- · Replies 12 ·
Graduate How to formulate the hydrogen atom with second quantized fields in QED
- LayMuon
- · Replies 21 ·
Undergrad Is SLAC producing light "light with a wavelength of 32nm"?
- edguy99
- · Replies 1 ·
Undergrad Is Lambda in Bell's Ansatz a Parameter for Many-Worlds Interpretation?
- jk22
- · Replies 4 ·
Undergrad Why are Hilbert spaces used in quantum mechanics?
- Frank Castle
- · Replies 26 ·
Undergrad New experimental support for pilot wave theory?
- ibkev
- · Replies 99 ·
Undergrad Is there a 'memory-effect' of measuring devices?
- entropy1
- · Replies 18 ·
Undergrad Why magnetic charge is pseudoscalar
- tzimie
- · Replies 4 ·
Undergrad "Asking photons where they have been" - Danan et al
- Swamp Thing
- · Replies 2 ·
Undergrad Vacuum energy versus expansion of the Universe
- Italian_Mike
- · Replies 1 ·
Undergrad Can identical particles be distinguishable?
- Twigg
- · Replies 2 ·
Undergrad Question on derivation/notation in a report
- TheCanadian
- · Replies 6 ·
Graduate How do we *know* the Schrodinger equation for H2+ can't be solved?
- AxiomOfChoice
- · Replies 27 ·
Undergrad Time evolution of a wave function
- Abhishek Sethi
- · Replies 13 ·
High School Do entangled particles need to be physically delivered to enable communication?
- PeterPendragon
- · Replies 12 ·
Graduate Change of the order of integration including Dirac delta
- GIM
- · Replies 36 ·
Graduate Effect of time reversed hamiltonian acting on a state?
- Brage
- · Replies 4 ·
High School Why can't Feynman's rolling slit apparatus be reset between electrons?
- lavinia
- · Replies 29 ·
Graduate Radiation from a dielectric body
- Karthiksrao
- · Replies 4 ·
Undergrad Photons being released from fire/heat
- victorhugo
- · Replies 1 ·
Undergrad Representing Mixed States in Hilbert Space
- Muthumanimaran
- · Replies 5 ·
High School In need of cool experiments for show called 'Quantum'
- Christina Eddowes
- · Replies 8 ·
High School Questions about recent paper on Entangled Histories
- quantumfunction
- · Replies 15 ·
Graduate On the renormalization group flow
- thephystudent
- · Replies 15 ·
Undergrad Problem in Deriving Rayleigh-Jeans Formula
- MnFeCo
- · Replies 1 ·
Undergrad Triplet State Symmetric Wavefunction
- looseleaf
- · Replies 6 ·
High School Does Schrödinger's paradox work with multiple boxes?
- ProfuselyQuarky
- · Replies 11 ·
Undergrad Making a quantum computer do Shor's algorithm
- anorlunda
- · Replies 1 ·