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 Why does recombining Stern-Gerlach beams restore the original spin state?
- Jehannum
- · Replies 13 ·
High School Are electromagnetic wavelength and quantum wavelength the same thing?
- Jehannum
- · Replies 5 ·
Graduate Derive the Principle of Least Action from the Path Integral?
- hyksos
- · Replies 5 ·
Graduate Can Bohmian Mechanics Effectively Address Relativistic Quantum Field Theories?
- atyy
- · Replies 87 ·
High School Searching for a Lost PhD Thesis on Black Holes
- BiGyElLoWhAt
- · Replies 7 ·
Graduate J-aggregation and H-aggregation differences
- Sciencestd
- · Replies 1 ·
High School Why don't electrons fall into the nucleus?.
- francis20520
- · Replies 6 ·
Undergrad Schiff moment in classical electrostatics
- BillKet
- · Replies 28 ·
Undergrad How do you normalize this wave function?
- R P Stone
- · Replies 31 ·
High School Quantum Entanglement spin measurement
- Frank_H
- · Replies 10 ·
Graduate How Can I Address the Divergence in $\phi$ and $\ket{\overrightarrow{P}}$?
- Diracobama2181
- · Replies 1 ·
High School Why is an electron's changing behaviour upon observation fascinating?
- EvilSapphire
- · Replies 3 ·
Undergrad How did Schrödinger find his equation?
- Tumorsito
- · Replies 15 ·
Undergrad Can an electron quantum tunnel inside the potential barrier?
- Leonardo Muzzi
- · Replies 7 ·
Graduate General Covariance in Quantum Field Theory
- Newton-reborn
- · Replies 11 ·
Undergrad Relativistic quantum mechanics
- redtree
- · Replies 32 ·
Undergrad Repulsion before the screen in a double-slit experiment
- JonAce73
- · Replies 11 ·
Insights Misconceptions about Virtual Particles - Comments
- A. Neumaier
- · Replies 355 ·
Undergrad Are Energy Eigenstate Coefficients Real-valued?
- LarryS
- · Replies 2 ·
Undergrad Probability of neutrino switching: more massive, more probable?
- nomadreid
- · Replies 4 ·
Undergrad Closure in the subspace of linear combinations of vectors
- Phys12
- · Replies 2 ·
Graduate Number of thermal photons in a real (finite Q) cavity
- f95toli
- · Replies 4 ·
Undergrad Exponential of momenta to entangle harmonic oscillators
- matteo137
- · Replies 2 ·
Undergrad Proof of Commutative Operators for Simultaneous Measurement
- VVS2000
- · Replies 14 ·
Graduate Conservation of angular momentum in positron-electron annihilation
- Simon Bridge
- · Replies 3 ·
Graduate Normalization of the radial part of the spherical harmonics
- Taz
- · Replies 14 ·
High School Have quantum micro-black holes been created at CERN?
- atommo
- · Replies 11 ·
Undergrad Calculate a spin state as a function of the base spin states
- Luke_Mtt
- · Replies 2 ·
Graduate Double slit experiment with electrons
- Butyln
- · Replies 7 ·
High School Is diamagnetism only present with varying magnetic fields?
- jaumzaum
- · Replies 3 ·
Graduate How can quantum mechanics and special relativity both be true if they're incompatible?
- Helena Wells
- · Replies 10 ·
Undergrad How to determine Spinor in Feynman diagram
- Markus Kahn
- · Replies 6 ·
Undergrad Quantum spaces without classical counterparts?
- Ssnow
- · Replies 5 ·
High School How Could Quantum Communications Operate at Light Speed Given Relativity?
- darthgoon
- · Replies 19 ·
Undergrad Renormalisation and running of the φ^3 and other coupling constants
- tomdodd4598
- · Replies 22 ·
High School Entanglement and the double slit: does detection of one particle collapse the other?
- shlosmem
- · Replies 13 ·
High School Why are electric and magnetic fields orthogonal in EM waves?
- SJMCGOWAN777
- · Replies 3 ·
Undergrad Quantizing the Dirac field with canonical commutation relations
- JD_PM
- · Replies 4 ·
Undergrad Jonsson’s apparatus for photons rather than electrons
- Phys12
- · Replies 3 ·
Undergrad What is the nature of the photons?
- Haorong Wu
- · Replies 7 ·
Undergrad Prove that the norm squared of a superposition of two states is +ve
- Phys12
- · Replies 19 ·
Undergrad Necessity of Quantum Gravity given Planck scales for nuclear physics
- Phys12
- · Replies 6 ·
Undergrad Bell's Theorem - why product of (2)spins can be +1 (Griffith's text)
- Sparky_
- · Replies 1 ·
Graduate Is randomness real or just a description of complex patterns?
- blazh femur
- · Replies 16 ·
Undergrad Solve the particle in a box problem using matrix mechanics?
- mike1000
- · Replies 41 ·
Undergrad Representing Quantum Gates in Tensor Product Space
- phun_physics
- · Replies 1 ·
Graduate Reference frame of the vacuum -- which forum?
- danb
- · Replies 21 ·
Undergrad Spin-orbit interaction and two inconsistent values
- hokhani
- · Replies 1 ·
Undergrad Photon absorption for an atomic electron
- Dfault
- · Replies 47 ·
Graduate Do bosons contradict basic probability laws?
- Philip Koeck
- · Replies 108 ·
Undergrad What would the world be like if the HUP were not a thing?
- Souma
- · Replies 6 ·
Undergrad Can an electron in the 1s orbital be indefinitely far from the nucleus?
- jaumzaum
- · Replies 43 ·
High School Has the Double Slit Experiment been Performed in a Near Vacuum?
- wolfy
- · Replies 2 ·
Undergrad Experimental confirmation of the Born rule
- Dadface
- · Replies 12 ·
Undergrad The "size" of entangled particles
- Souma
- · Replies 18 ·
Undergrad Pair production via Quantum Tunneling has negative Kinetic energy?
- Superposed_Cat
- · Replies 3 ·
Undergrad Does quantum theory describe light as a wave?
- HtimsNats
- · Replies 7 ·
Undergrad What is the meaning of the mass assigned to an individual quark?
- Dale
- · Replies 21 ·
Undergrad Wilson-Sommerfeld quantization to solve square-well potential
- Robin04
- · Replies 5 ·
Graduate Eigenstates of ##\phi^4## theory
- HomogenousCow
- · Replies 2 ·
Graduate Spin dynamics and the Pauli exclusion principle
- atomiclaser
- · Replies 1 ·
Undergrad Meaning of the Orbital Angular Momentum of Super Chiral Light
- bob012345
- · Replies 6 ·
Undergrad Hyperfine Splitting: Get Help Understanding It
- privategenius
- · Replies 2 ·
Undergrad Are phonons created when hitting a table?
- CGandC
- · Replies 2 ·
Undergrad Dirac Lagrangian and Covariant derivative
- PeroK
- · Replies 14 ·
Graduate Amplitudes for ##\phi^4## theory
- PeroK
- · Replies 4 ·
Undergrad Normal order and overlap of states
- Markus Kahn
- · Replies 6 ·
Undergrad Can a Hamiltonian with non-spherical potential commute with l^2?
- Feelingfine
- · Replies 2 ·
Graduate Why does the 1/2E coefficient persist in particle number operator with ladder operators?
- arnshch
- · Replies 3 ·
Graduate Functional Determinant of a system of differential operators?
- Yellotherephysics
- · Replies 2 ·
High School Quantum Tunneling different individual transmission probabilities
- wolfy
- · Replies 2 ·
Undergrad Spin in Real Space: Meaning of Z-Component
- hokhani
- · Replies 7 ·
Graduate Converting between field operators and harmonic oscillators
- SupernerdSven
- · Replies 2 ·
Undergrad Schrodinger equation on the complex disk
- Ssnow
- · Replies 5 ·
Undergrad The wave function in the finite square well
- Terrycho
- · Replies 10 ·
Undergrad What is the energy propagator in quantum field theory?
- PeroK
- · Replies 4 ·
Undergrad On 1/2 spin - which is the X axis?
- MichPod
- · Replies 39 ·
Undergrad Confusion about position state kets
- Oliver321
- · Replies 7 ·
Graduate 2-electron system under compression
- hilbert2
- · Replies 12 ·
Graduate Absorption of an Exciton and Exciton propagation
- Sciencestd
- · Replies 1 ·
Graduate How to calculate the interband velocity matrix in a graphene system
- Sunny Huang
- · Replies 1 ·
Undergrad Quantum operators and trasformation under rotations
- forever_physicist
- · Replies 3 ·
Undergrad Explaining atoms and bonding using entropy
- micklat
- · Replies 10 ·
Undergrad Matrix Representations of the Poincare Group
- cuallito
- · Replies 4 ·
Graduate Concurrence as a measure of entanglement
- LagrangeEuler
- · Replies 1 ·
Undergrad Using general relativity to violate the uncertainty principle
- Souma
- · Replies 14 ·
Undergrad Double Slit Interference Question
- David Charles
- · Replies 19 ·
Undergrad Double Slit Interference Question II
- David Charles
- · Replies 2 ·
Graduate Quantum computers and Annular Josephson junctions
- LagrangeEuler
- · Replies 3 ·
Undergrad Does quantum behavior differ between past and present observation?
- jellellogram
- · Replies 2 ·
Undergrad Double slit-experiment confusion
- user30
- · Replies 4 ·
High School Can entangled electrons in helium be observed and measured in practice?
- Andrew Wright
- · Replies 10 ·
High School Can a photon with wavelength longer than the box be decomposed into eigenmodes?
- ilper
- · Replies 15 ·
Undergrad Why isn't the Goldstone boson on the Standard Model map?
- bland
- · Replies 3 ·
Undergrad Really? Schrödinger's cat again?
- DaveE
- · Replies 6 ·
Undergrad Why is the speed of photons different?
- GREENMONKEY
- · Replies 4 ·
Graduate Normalizing quantum price returns from anharmonic oscillator eigenvalues
- yosmod04
- · Replies 9 ·
Undergrad Is Quantum Mechanics Infinitely More Complex than Classical Mechanics?
- bob012345
- · Replies 55 ·
Undergrad Lorentz violation, multiple preferred frames, vacuum energy
- asimov42
- · Replies 16 ·
Undergrad Physicists entangle 15 trillion hot atoms
- Tom.G
- · Replies 0 ·