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 Optics wave amplitude question
- Master J
- · Replies 1 ·
Graduate Quadrupole-quadrupole interaction?
- neo143
- · Replies 9 ·
Graduate Are There Operators in Quantum Physics Without Eigenvalue Properties?
- sancharsharma
- · Replies 8 ·
Graduate What does h.c. mean in Lagrangians?
- hamiltonjr
- · Replies 2 ·
Graduate Wavelength of photon and size of imaged object
- fred1234
- · Replies 7 ·
Undergrad What is the effect of photon-electron collisions in X-ray imaging?
- genefalk
- · Replies 24 ·
Graduate What Are Propagators and Green's Functions in Quantum Mechanics?
- Niles
- · Replies 4 ·
Graduate Number of electron of a Hydrogen atom (molecule)
- torehan
- · Replies 8 ·
Graduate Why Is Quantum Mechanics So Difficult to Understand?
- y.moghadamnia
- · Replies 5 ·
Undergrad Entanglement and Teleportation
- Nienstien
- · Replies 1 ·
Undergrad Was the relation between E and f known BEFORE quantum theory?
- nonequilibrium
- · Replies 8 ·
Graduate Why is the beta decay electron spectrum continuous rather than discrete?
- TrickyDicky
- · Replies 3 ·
Graduate Temporal symmetry solves all quantum paradoxes?
- TheAlkemist
- · Replies 90 ·
Graduate Analysis and case study ideas for BB84 quantum cryptography
- mumaga
- · Replies 9 ·
Graduate Etracting ZPP from the vacuum is in violation of the 1st law of thermodynamics?
- jonnyk
- · Replies 2 ·
Graduate Thermal average of fermionic operators in equation 8.60
- Niles
- · Replies 3 ·
Graduate Mapping Points on the Bloch Sphere
- captainhampto
- · Replies 5 ·
Graduate What happens if two operators commute?
- Master J
- · Replies 2 ·
Graduate Attosecond Tomography and Elephants
- Joseph14
- · Replies 1 ·
Graduate How do we make sense of exponentiating an operator in quantum mechanics?
- Chopin
- · Replies 7 ·
Graduate Why in Quantum Mechanics is about energy but no force
- JayKo
- · Replies 14 ·
Graduate Interference pattern observed half-way into the formation
- avarmaavarma
- · Replies 1 ·
Graduate Are virtual photons and electron-positron pairs related in the polarized vacuum?
- TrickyDicky
- · Replies 1 ·
Graduate Does Collapsing a Wave Function Require Inputting Energy into a System?
- Kidphysics
- · Replies 27 ·
Graduate Symmetries in Quantum Mechanics
- LAHLH
- · Replies 12 ·
Graduate Questions concerning Delayed Quantum Eraser
- jgm340
- · Replies 7 ·
Graduate Why Must Annihilation Occur Between Particle and Corresponding Antiparticle?
- ndung200790
- · Replies 1 ·
Graduate What constitutes as a measurement?
- Qentanglement
- · Replies 8 ·
Graduate How does time dependent perturbation theory apply to atomic physics?
- jc09
- · Replies 1 ·
Graduate Energy levels for a different plancks constant
- bhsmith
- · Replies 14 ·
Graduate Density Matrix (pure state) Property
- Toten
- · Replies 3 ·
Graduate Understanding Schrödinger's Cat Experiment and the Many Worlds Interpretation
- lj19
- · Replies 37 ·
Graduate Planck's Inspiration to Solve Blackbody Radiation
- qbslug
- · Replies 21 ·
Graduate Commute Operators: Hi Niles - Find Out Now
- Niles
- · Replies 1 ·
Graduate Spin, Anti-matter and all that jazz.
- QEDrpf33
- · Replies 8 ·
Graduate How does interacting Lagrangian have form of product of fields?
- ndung200790
- · Replies 3 ·
Graduate Grover's Algorithm/Superposition?
- Bonham
- · Replies 1 ·
Graduate Who Can Apply the Operator on a Wave Function to Measure an Observable?
- Joscha
- · Replies 60 ·
Graduate Energy: Discrete or Continuous
- zlander79
- · Replies 1 ·
Graduate Does spin state remain constant without measurement?
- Turtle492
- · Replies 3 ·
Graduate Symmetry factors (Srednicki, figure 9.11)
- kexue
- · Replies 4 ·
High School If we saw x-ray waves could we see the inside of the objects?
- egerol1
- · Replies 3 ·
Graduate Quantization of Klein-Gordon Field
- go quantum!
- · Replies 3 ·
Graduate Weak Electron Interaction: Virtual Photon Effects?
- scope
- · Replies 6 ·
Graduate What is the significance of the E/M ratio in modern physics?
- sirous666
- · Replies 3 ·
Graduate Quantum Mechanics Questions: Superposition, Bohm Mechanics
- StevieTNZ
- · Replies 3 ·
Graduate Is uncertainty in the Heisenberg principle one-dimensional or volumetric?
- zeromodz
- · Replies 1 ·
Graduate Puzzled about electromagnetic field behaving like oscillators
- commutator
- · Replies 1 ·
Graduate How does Srednicki derive equation 39.8 for the bar notation?
- LAHLH
- · Replies 18 ·
Graduate Pauli exclusion principle between 2 identical fermions
- scope
- · Replies 2 ·
Graduate What is the difference between left and right Weyl spinors in particle physics?
- paweld
- · Replies 6 ·
Graduate Why the discrepancy in muonic H Bohr radius? 285 fm or 256 fm?
- seattle.truth
- · Replies 3 ·
Graduate No uncertainty principle for scalar particles?
- scope
- · Replies 6 ·
Graduate Ground state Bohr radius for muonic hydrogen
- seattle.truth
- · Replies 1 ·
Graduate Is There a Contradiction in Weinberg's QFT Book on Simultaneous Eigenstates?
- diraq
- · Replies 8 ·
Graduate Can Quantum Entanglement Solve the Mystery of Quantum Gravity?
- bassplayer142
- · Replies 5 ·
Graduate Wavefunction really like a wave?
- venton
- · Replies 3 ·
Graduate What Experiment Demonstrates the Particle Behavior of Electrons?
- bhsmith
- · Replies 3 ·
Graduate What particles correspond to spin-3/2 and spin-2 representations of SO(3)?
- kexue
- · Replies 3 ·
Graduate Difference between particle density and quantum density operators
- Liao Chen
- · Replies 3 ·
Graduate Regarding normalization of the eigen basis vectors
- ashokanand_n
- · Replies 1 ·
Graduate Is Space Quantized in Electromagnetic Fields?
- jkg0
- · Replies 4 ·
Graduate Can I Calculate Traces and Cross Sections in QED Using Gamma Matrices?
- ha.dnri
- · Replies 1 ·
Graduate Why does the Pauli X matrix differ in the Z and X bases?
- quietrain
- · Replies 16 ·
Graduate Newton-Wigner operator for K-G filed
- paweld
- · Replies 1 ·
Graduate Solving the Dirac Equation for the Hydrogen Atom
- go quantum!
- · Replies 2 ·
Graduate An identity for functions of operators
- Identity
- · Replies 2 ·
Graduate Questions about the Photoelectric Effect
- Kidphysics
- · Replies 7 ·
Graduate Measuring one slit in double slit experiment
- cryptist
- · Replies 12 ·
Graduate Deep space Communication hypothetical question
- Panwasbipolar
- · Replies 10 ·
Graduate Can weak interaction be defined as a force related to distance between objects?
- Khrapko
- · Replies 5 ·
Graduate Understanding Matter Waves and the de Broglie Hypothesis in Quantum Physics
- TrickyDicky
- · Replies 12 ·
Graduate Worm Hole Idea: Electron talk at Great Distance
- freydawg56
- · Replies 1 ·
Graduate Equalities for Paulimatrix averages
- Funzies
- · Replies 1 ·
Graduate Proving af(a†)|n⟩ = df(a†)/da|0⟩ for annihilation operators
- Shadowz
- · Replies 18 ·
Graduate Can centripetal force mediate graviton travel in spacetime?
- ForceBoson
- · Replies 4 ·
Undergrad Difference between electron shells and orbitals
- mariush
- · Replies 8 ·
Graduate Ryder, QFT, 1985, pg. 40, Eq. (2.69) K = sigma?
- Living_Dog
- · Replies 4 ·
Graduate Proving eigenvalue of L_z squared cannot exceed eigenvalue of L^2
- Funzies
- · Replies 2 ·
Graduate Displacement operator for coherent states?
- Orbb
- · Replies 11 ·
Graduate The Hydrogen Atom (Schrodinger vs original Bohr theory)
- aheizler
- · Replies 1 ·
Graduate Wave Formula by complex analysis
- zerat2000
- · Replies 1 ·
Graduate Do N photons from both open slits give N1+N2 detections?
- mitarbre
- · Replies 4 ·
Graduate Can Entangled Particles Still Show Interference in Quantum Experiments?
- feizex
- · Replies 1 ·
Graduate Deck of Cards and Planck Time?
- nicholasfouss
- · Replies 3 ·
Graduate Second Quantization: Explaining Creation/Annihilation Operator Transformation
- Niles
- · Replies 8 ·
Graduate Probability of finding a state
- quietrain
- · Replies 4 ·
Graduate Can't find that on the dictionary
- go quantum!
- · Replies 5 ·
Undergrad Maximum detectable wavelength of a photoresistor
- Rula
- · Replies 2 ·
Graduate Do Commuting Operators Always Share a Common Basis of Eigenvectors?
- Funzies
- · Replies 2 ·
Graduate SU(2) spinor transformations and the role of ξ* in Ryder chapter 2
- Living_Dog
- · Replies 7 ·
Graduate Is a Radio Wave Raser Feasible and How Would It Function?
- ChrisAndre
- · Replies 4 ·
Undergrad Energy Levels: What Happens if First Level Contains More Than 2 Electrons?
- ahiazaa
- · Replies 2 ·
Graduate Uncertainty principle and double-slit interference?
- xylai
- · Replies 40 ·
Graduate Quantum Mechanics - Ritz variational principle
- el_hijoeputa
- · Replies 2 ·
Graduate Decoherence over long distances - thought expt
- Karl Coryat
- · Replies 1 ·
Graduate Is QM Phase Inherently Relativistic?
- LarryS
- · Replies 5 ·
Graduate What means 'coherence' in quantum mechanics?
- go quantum!
- · Replies 2 ·
Graduate Wavefunction of Macroscopic Objects
- StevieTNZ
- · Replies 1 ·
Graduate Proving Unachievability of Absolute Zero: Uncertainty Principle
- Archosaur
- · Replies 4 ·