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 Quantum Immortality: Implications of MWI on Death?
- blah_blah
- · Replies 6 ·
Graduate Symmetry factors in Feyman Diagrams
- vertices
- · Replies 7 ·
Graduate Local density of number of photons
- paweld
- · Replies 1 ·
Graduate Sommerfeld quantisation:relation between energy and potential
- krishna mohan
- · Replies 2 ·
Graduate S-orbitals, angular momentum and Heisenberg uncertainty
- Scraping Rust
- · Replies 5 ·
Graduate How can I solve for Equation 2.16 in Srednicki?
- LAHLH
- · Replies 3 ·
Graduate Simplifying Feynman Diagram for Nasty 10 Point Green's Function?
- vertices
- · Replies 1 ·
Graduate The expectation of an expection (relating to Wick's Theorem)
- vertices
- · Replies 4 ·
Graduate Understanding Normalization in Spin Sum: Peskin vs. Kaku and Zee's Approach"
- nklohit
- · Replies 1 ·
Graduate Photon absorption via changing EM field
- Edi
- · Replies 1 ·
Graduate Weight of electrons and positrons after they annihilate into gamma rays
- Raekwon
- · Replies 13 ·
Graduate S-Matrix in non-relativistic limit
- nklohit
- · Replies 2 ·
Graduate How Do We Calculate the Composite Spin of a System with Three or More Particles?
- Xian
- · Replies 3 ·
Graduate Why quantum entanglement differs from separating red and blue pens
- tell_me_why
- · Replies 4 ·
Graduate Is there an equivalent of the HUP for spins?
- nomadreid
- · Replies 19 ·
Graduate Electrodynamics question and maybe quantum/classical misunderstanding
- jfy4
- · Replies 4 ·
Undergrad Does a laser experience recoil due to photon momentum?
- ssope
- · Replies 46 ·
Undergrad How is it then when you colide 2 protons
- clm321
- · Replies 19 ·
Graduate Integral involving exponentials and the Time ordering operator
- vertices
- · Replies 4 ·
Undergrad Quantization of Length: Can You Achieve Every Length Between 1" and 2"?
- Axuality
- · Replies 7 ·
Graduate Is there a quantum mechanical acceleration operator?
- jfy4
- · Replies 9 ·
Graduate Understanding Spin: Share Your Ideas!
- luxiaolei
- · Replies 5 ·
Graduate Perturbation Theory: Deciphering Missing Lines of Explanation
- vertices
- · Replies 5 ·
Graduate Solving radial wavefunction in odd central potential
- FunkyDwarf
- · Replies 2 ·
Graduate Understanding S-Wave and P-Wave Annihilation
- fliptomato
- · Replies 4 ·
Graduate Bound states of Yukawa potential
- drummerguy
- · Replies 1 ·
Graduate Energy Uncertainty Less For High-Energy Particles?
- LarryS
- · Replies 2 ·
Graduate Does instantaneous communication implies a preferrred Lorentz frame?
- Demystifier
- · Replies 137 ·
Graduate What is semi-classical level counting?
- jostpuur
- · Replies 5 ·
Graduate What Are the Implications of Srednicki's \langle 0 \mid \phi(x) \mid 0 \rangle?
- LAHLH
- · Replies 2 ·
Graduate Why use complex exponentials for matter waves instead of sines
- zodas
- · Replies 7 ·
Undergrad How does quantum observation affect particles without physical contact?
- GUS
- · Replies 5 ·
Graduate Representations and change of basis
- Niles
- · Replies 1 ·
Graduate Behaviour of electron as wave and Particle
- KK
- · Replies 25 ·
Graduate Computing cellular homology with Macaulay2
- Chris Hillman
- · Replies 8 ·
Graduate Are Shankar's equations for example 1.8.6 wrong?
- juan123
- · Replies 1 ·
Graduate Oscillation frequency of probability density P(x,t)
- nhk150709
- · Replies 2 ·
Graduate Hydrogen spin-orbit interaction
- ian2012
- · Replies 6 ·
Undergrad How gravity can be bent if its just a messender particle.
- clm321
- · Replies 8 ·
Graduate Lorentz Invariant Majorana Neutrinos
- rkrsnan
- · Replies 8 ·
Graduate Writing a matrix as an outer product expansion.
- raisin_raisin
- · Replies 9 ·
Graduate Solution for Dirac equation with zero mass.
- rkrsnan
- · Replies 4 ·
Graduate Orthochronous Lorentz Transformations
- vertices
- · Replies 1 ·
Graduate Showing that commutator is invariant under orthchronous LTs
- vertices
- · Replies 5 ·
Graduate Entanglement and Concurrence: asking for definitions
- DaTario
- · Replies 3 ·
Graduate Reflection coefficient for finite square barrier scattering
- ronaldoshaky
- · Replies 5 ·
Graduate Why is wavefunction complex-valued?
- cadamcross2
- · Replies 8 ·
Graduate Probabilistics of Quantum Physics
- Svensken
- · Replies 5 ·
Graduate Psi-Collapse in Nature: Definition and Implications
- The thinker
- · Replies 1 ·
Undergrad Does Hawking radiation make smaller black holes decay faster?
- srfriggen
- · Replies 4 ·
Graduate Is My Normalized Wave Function Accurate?
- intervoxel
- · Replies 5 ·
Graduate Feynman propagator on the cylinder - position space representation
- DrFaustus
- · Replies 7 ·
Graduate Understanding Lowering Operator A and Hermitianity
- ronaldoshaky
- · Replies 1 ·
Graduate Quantum Tunneling math and Schrodinger's Equation
- Stevenpd
- · Replies 1 ·
Graduate Free particles in second quantization
- Niles
- · Replies 11 ·
Graduate BRS: euclidean surfaces a la Cartan
- Chris Hillman
- · Replies 3 ·
Graduate Matrix Transformation: U^\dagger vs U
- Niles
- · Replies 3 ·
Graduate Uncertainty principle consist with energy conservation?
- luxiaolei
- · Replies 11 ·
Graduate Tensor product of vector spaces: confusion
- Goldbeetle
- · Replies 4 ·
Graduate Is superposition describing all potential states of a particle?
- MattAndMatthe
- · Replies 4 ·
Graduate Energy Principle and Hydrogen Atom
- sharma_satdev
- · Replies 9 ·
Graduate Dirac equation for many particles system
- ranytawfik
- · Replies 8 ·
Graduate Rectangular Potential well if hbar -> 0
- divB
- · Replies 5 ·
Graduate Error in book? (derivation of quantum well)
- divB
- · Replies 2 ·
Graduate Equation for quantizing general relativity from Seeing Black Holes
- kazparov
- · Replies 6 ·
Graduate Does the Chain Rule Apply to Gauge Transformations in Lie Groups?
- vertices
- · Replies 3 ·
Graduate Uncertainty principle on P and E exchange
- luxiaolei
- · Replies 10 ·
Graduate Heuristic derivation of Schrodinger's equation for a layman
- jdstokes
- · Replies 15 ·
Graduate Probability Density of Particle in Potential Well
- ronaldoshaky
- · Replies 1 ·
Graduate Gravitational force on observed particle?
- Xenoman
- · Replies 4 ·
High School What Are Will 'O The Wisp and Foo Fighters?
- Leah
- · Replies 53 ·
High School If light is a wave then how can it be formed into a laser?
- chopficaro
- · Replies 12 ·
Graduate Vacuum fluctuations and matter
- GeorgCantor
- · Replies 14 ·
Graduate Differential Geometry and Quantum Mechanics
- Reedeegi
- · Replies 3 ·
Graduate Notation relating to gamma matrices
- vertices
- · Replies 9 ·
Graduate Lippmann-Schwinger Equation
- <bra|ket>
- · Replies 1 ·
Graduate What Are the Degrees of Freedom in Lorenz and Columb Gauges?
- mkbh_10
- · Replies 1 ·
Graduate Degeneracy and Symmetrization Requirement
- hbweb500
- · Replies 6 ·
Undergrad What is Schrödinger's cat used to explain?
- wuko
- · Replies 5 ·
Graduate Antisymmetric wavefunctions for more than two particles
- quasar_4
- · Replies 1 ·
Graduate Double-Slit Experiment vs Identical Particles
- LarryS
- · Replies 3 ·
Graduate Why Did My Teacher Make a Substitution in Transforming a Hamiltonian?
- Niles
- · Replies 5 ·
Graduate Raising and Lowering Indices and expansion
- vertices
- · Replies 6 ·
Graduate Why Don't Photons Get Absorbed in Double Slit Experiments?
- alex440
- · Replies 2 ·
Undergrad Einstein's theory on photoelectric effect
- agtee
- · Replies 6 ·
Undergrad Compton vs Photoelectric effect?
- pivoxa15
- · Replies 12 ·
Graduate Adding spin components on different axes x+x=Z?
- chopficaro
- · Replies 3 ·
Graduate Why is quantum spacetime necessarily random?
- flufffrost
- · Replies 4 ·
Graduate Probablity density of 1s in hydrogen atom
- Karrar
- · Replies 1 ·
Graduate Finding \Psi(x,t) From Schrodinger Equation
- puneet.988
- · Replies 5 ·
Graduate What if Hamiltonian is not constant in time?
- jostpuur
- · Replies 10 ·
Graduate Can Photon Energy Be Equated to Kinetic and Potential Energy?
- manifested
- · Replies 3 ·
Graduate Why do creation and annihilation operators pick out matrix elements like bras and kets?
- Niles
- · Replies 3 ·
Graduate Srednicki QFT chapter 8 question
- LAHLH
- · Replies 3 ·
Graduate Is quantum potentiality more like weight or a wave?
- MattAndMatthe
- · Replies 2 ·
Graduate Is energy of a free particle observable?
- sweet springs
- · Replies 40 ·
Undergrad What vibrates in De Broglie waves?
- shripathee
- · Replies 6 ·
Graduate How do gauge transformations relate to constraints in canonical quantization?
- mtak0114
- · Replies 8 ·
Graduate Photon Off a Mirror: How Does It Work?
- cragar
- · Replies 4 ·
Graduate Solving the Schrödinger Equation for a Step Potential
- laharl88
- · Replies 10 ·