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.
Threads
Undergrad Finding the Error in Computing Spherical Tensor of Rank 0 Using General Formula
- Silicon-Based
- · Replies 1 ·
Undergrad The free particle in spherical coordinates
- loewenzahn
- · Replies 1 ·
High School What is the speed of electron movement in atoms at different temperatures?
- SovietComics
- · Replies 7 ·
Undergrad Why is the lowest energy level close to the center?
- LordWhiplash
- · Replies 5 ·
Undergrad Information in a light beam relative to the width of the beam?
- Zelebg
- · Replies 6 ·
Graduate The probability of finding R out of N bosons in one half of a volume
- Philip Koeck
- · Replies 23 ·
Undergrad Equal or larger/smaller versus larger/smaller in boundary conditions
- Tokki
- · Replies 1 ·
Undergrad What does it mean for phases to overlap in a phase transition?
- Heidi
- · Replies 12 ·
High School Exploiting radiocarbon dating for FTL communication
- SongDog
- · Replies 5 ·
High School Position of a particle and photons
- Maslova
- · Replies 16 ·
Undergrad When taking a functional derivative, do you include constant terms?
- The black vegetable
- · Replies 1 ·
High School The use of the dx in the quantum state vector integral
- etotheipi
- · Replies 1 ·
High School Teaching POVM through detector response and Born's rule
- A. Neumaier
- · Replies 62 ·
Undergrad How does the N signify the indistinguishability in the Gibbs Paradox?
- annaphys
- · Replies 3 ·
Undergrad Why are cumulants extensive and moments are not?
- annaphys
- · Replies 3 ·
Undergrad Quantum state variable for entangled system
- nomadreid
- · Replies 8 ·
Undergrad Location of the quantum effect
- homerwho
- · Replies 1 ·
Undergrad Rigged Hilbert Space X: Eq (1) and (2)
- TTT
- · Replies 1 ·
Undergrad Did quarks and leptons exist before the Higgs gave them mass?
- Ranku
- · Replies 14 ·
Undergrad Can cosmic ray experiments test the simulation hypothesis?
- Endypanzer
- · Replies 9 ·
Graduate Classical limit of the propagator
- crises
- · Replies 3 ·
Undergrad How Do Quantum Equations Predict Outcomes in Research?
- stef3679
- · Replies 3 ·
Undergrad Can Different Shapes of Slits Affect the Diffraction Pattern of Single Photons?
- DenniSys
- · Replies 11 ·
Undergrad What happens if a low energy photon collides with an atom in the ground state?
- fxdung
- · Replies 4 ·
Undergrad Is there consensus on whether motion is continuous in quantum mechanics?
- Zelebg
- · Replies 5 ·
High School The nature of virtual photons in quantum electrodynamics
- Sophrosyne
- · Replies 6 ·
Undergrad Why doesn't a ground state electron emit photons in QED?
- fxdung
- · Replies 9 ·
Graduate Fermion mass terms in Peskin and Schroeder's book
- Geonaut
- · Replies 6 ·
Undergrad Taking a partial trace of a multipartite state for measurement
- beefbrisket
- · Replies 1 ·
Undergrad Using the Variational Method to get higher sates
- ExplosivePete
- · Replies 3 ·
Undergrad Why does rotating a spin-1/2 eigenstate around z give a phase factor?
- Silicon-Based
- · Replies 2 ·
Undergrad Why in BEC we must separate number of particles of ground state?
- fxdung
- · Replies 5 ·
Graduate Vibrational relaxation through electron-hole pairs
- thearif333
- · Replies 1 ·
Undergrad Do macro objects get entangled?
- entropy1
- · Replies 140 ·
Undergrad Why don't Cooper electrons accelerate infinitely?
- member 666967
- · Replies 17 ·
Graduate Functional determinant with stochastic differential equation
- TroyElliott
- · Replies 2 ·
Undergrad Difference between electrodynamic suspension and quantum levitation
- kipling_01
- · Replies 5 ·
Undergrad Integral in a variational principle problem
- MrMuscle
- · Replies 3 ·
Graduate Expectation Value of a Stabilizer
- Johny Boy
- · Replies 1 ·
Graduate Constructive QFT - current status
- Auto-Didact
- · Replies 60 ·
Graduate Vector and Axial vector currents in QFT
- RicardoMP
- · Replies 1 ·
Undergrad Why are even n values sin solutions and odd n values cosine in particle in a box?
- MaestroBach
- · Replies 6 ·
Undergrad Best sources to understand the Wigner-Eckart theorem?
- andresB
- · Replies 1 ·
Undergrad Why does the energy level of an electron in an atom have a width?
- fxdung
- · Replies 3 ·
Undergrad Question regarding a Free particle and Hilbert space (QM)
- CGandC
- · Replies 5 ·
Undergrad What Do Most Physicists Call the Quantum-To-Classical Cut?
- bhobba
- · Replies 24 ·
Undergrad Are compatible observables the same as commuting operators?
- Haynes Kwon
- · Replies 1 ·
Graduate Gauge Invariance of the Schrodinger Equation
- Diracobama2181
- · Replies 9 ·
High School Electrons in a nonmoving conductor and non-varying magnetic field
- PainterGuy
- · Replies 6 ·
Graduate Reading canonical commutation relations from the action (QHE)
- binbagsss
- · Replies 4 ·
Undergrad Uncertainty relation for position and angular frequency in photons
- Negatratoron
- · Replies 2 ·
Undergrad Questions about Rotation Groups in Physics
- Blub
- · Replies 7 ·
Graduate E-writing Action on a different slice of space-time, Quantum Hall Effect
- binbagsss
- · Replies 1 ·
Undergrad Summary of the Universe (2019 version)
- IvanC
- · Replies 1 ·
Undergrad Matrix Representation of the Angular Momentum Raising Operator
- hnicholls
- · Replies 7 ·
Graduate Qubit Energy Level Required to be Unevenly Separated
- metamaterial
- · Replies 1 ·
Graduate What Is the Renormalized Gluon Dressing Function?
- RicardoMP
- · Replies 1 ·
Undergrad Deduce if the spectrum is discrete/continuous from the potential
- QuasarBoy543298
- · Replies 2 ·
Undergrad Is the wavefunction always an analytic signal?
- olgerm
- · Replies 1 ·
Graduate Expectation value for spins in maximally entangled triplet states
- allisonpw
- · Replies 14 ·
High School Probability of spin in the +x direction
- srallaba
- · Replies 3 ·
Undergrad Why do we need two representations of SU(3)
- Jelly-bean
- · Replies 8 ·
Undergrad How can the photon wave function be described?
- Jamister
- · Replies 27 ·
High School Does Retrospective Indeterminacy Reveal a Deterministic Universe?
- Lynch101
- · Replies 12 ·
Graduate QHE ' the effective action should be a local functional'
- binbagsss
- · Replies 1 ·
Graduate QHE: rotational invariance, no terms linear in E or B
- binbagsss
- · Replies 1 ·
High School Measurement postulate = von Neumann’s projection postulate?
- Aidyan
- · Replies 2 ·
High School Why is it assumed communication through entanglement would be FTL?
- BoMbY
- · Replies 148 ·
High School How would time flow for each parallel universe?
- Brennick908
- · Replies 4 ·
Graduate Is there a quantum uncertainty to the number of atoms in a marble?
- jfizzix
- · Replies 41 ·
Graduate Classical fields: EM fields vs. Gravitational fields
- SherlockHolmes
- · Replies 23 ·
Undergrad Why spin matrixes number of rows depends of spinn magnitude?
- olgerm
- · Replies 1 ·
Undergrad Possible simple Density Matrix Question
- Diracobama2181
- · Replies 1 ·
Graduate Can I get electronic copies of the original QM papers?
- royp
- · Replies 8 ·
Undergrad Does light consist of oscillating vacuum fluctuations?
- epotratz
- · Replies 21 ·
High School Can photons of visible light lose energy and become sub-visible?
- royp
- · Replies 1 ·
Graduate Four spin 1/2 particles at the Vertices of tetrahedron
- Diracobama2181
- · Replies 7 ·
Graduate Time-dependent unitary transformations of the Hamiltonian
- Muninn
- · Replies 9 ·
Undergrad Why are there no Rabi oscillations in the rotating frame?
- Jufa
- · Replies 1 ·
Undergrad Mirrors, phase shifts, and position
- Talisman
- · Replies 4 ·
Undergrad On what plane of existence do quantum computations occur?
- TunnelingthuWorlds
- · Replies 1 ·
High School Tunneling through possible worlds
- TunnelingthuWorlds
- · Replies 4 ·
Graduate Canonical momentum ##\pi^\rho## of the electromagnetic field
- Riotto
- · Replies 4 ·
Undergrad Boltzmann equation and energy level occupancy at infinitely high temp
- Haynes Kwon
- · Replies 11 ·
Undergrad About L-S interaction or spin orbit coupling
- Zala Jaydevsinh
- · Replies 1 ·
Graduate Solving Spin-Spin Interaction for Total Spin Commutation
- Diracobama2181
- · Replies 1 ·
Graduate Fractional Quantum Hall Effect- degeneracy of ground state (Tong's notes)
- binbagsss
- · Replies 1 ·
Graduate Kubo Formula Deriviation - interaction picture, complete eigenbasis
- binbagsss
- · Replies 1 ·
Graduate Does The Use Of The Zeta Function Bypass Renormalization
- bhobba
- · Replies 3 ·
Graduate Volume Element for Isotropic Harmonic oscillator
- Diracobama2181
- · Replies 1 ·
Graduate Measuring Deflection of Star Light During Eclipse: Separating Space-Time Effects
- Grossglockner
- · Replies 5 ·
Graduate About Glauber's formula(or special Baker–Campbell–Hausdorff
- Frost_Xue
- · Replies 7 ·
Undergrad How does gauge symmetry arise in QFT and its implications?
- CSnowden
- · Replies 4 ·
Graduate Spin change of Fermions and quantum energy spectrum
- claymine
- · Replies 1 ·
Graduate Is renormalization the ideal solution?
- Geonaut
- · Replies 57 ·
Graduate Hamiltonian background magnetic field, perturbed by electric field
- binbagsss
- · Replies 2 ·
Undergrad Stern-Gerlach "interferometry"
- WWCY
- · Replies 10 ·
High School Quantum computer vs supercomputer performance
- Bob Walance
- · Replies 8 ·
Undergrad QED question: Photons absorbed and emitted by electrons
- dsaun777
- · Replies 19 ·
Undergrad The expected value (or mean) of X
- peace
- · Replies 6 ·