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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Undergrad Why Do We Have The Effect Of Spontaneous Emission And Absorption
- bhobba
- · Replies 2 ·
Undergrad What are the degrees of freedom of a quark?
- stephen weber
- · Replies 14 ·
Undergrad Wave function of a laser beam?
- DEvens
- · Replies 6 ·
High School Do photons bunch up at an interface? Can they lase (laze?)
- ImaO
- · Replies 17 ·
Undergrad Can a simulation hypothesis simulate quantum physics?
- Endypanzer
- · Replies 10 ·
Undergrad Simulation Hypothesis: Quantum Computer Modeling
- Johnny5454
- · Replies 2 ·
Graduate Vacuum energy density after spontaneous symmetry breaking
- Geonaut
- · Replies 5 ·
High School Why doesn't photon energy depend on wave amplitude?
- jeremyfiennes
- · Replies 2 ·
Undergrad Local Causality and Bell's Second Theorem
- bhobba
- · Replies 48 ·
Undergrad Did Erwin Schrödinger propose that reality could be contradictory?
- Suekdccia
- · Replies 1 ·
Undergrad About the repulsive force between two electrons
- intothefire
- · Replies 7 ·
Undergrad Can we physically realize unbound states?
- Haorong Wu
- · Replies 16 ·
High School Can Hydrogen Atoms on Earth and the Moon Share Electrons?
- tasiz
- · Replies 27 ·
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 Why wasn't Newtonian gravitation treated as a classical field in 1920?
- 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 ·