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 What does it mean to express a quantum state as a linear combination of basis eigenstates?
- Molar
- · Replies 11 ·
Graduate Probability function being imaginary?
- Ananthan9470
- · Replies 2 ·
Graduate What is the equivalence to the free field in the interaction picture?
- naima
- · Replies 1 ·
Graduate Deduction of the action of this unitary on the wavefunction
- julian
- · Replies 5 ·
Graduate Electron wave function in quantum cascade laser?
- Nav
- · Replies 3 ·
Graduate How does an electron know which states are available in an atom?
- Mr Wolf
- · Replies 10 ·
Graduate What if elementary particles do have size
- Nav
- · Replies 3 ·
Graduate Why did quantum founders consider consciousness but it's rejected now?
- Pete Hammand
- · Replies 85 ·
Graduate Why there is mod 2pi in Berry phase?
- mmssm
- · Replies 8 ·
Graduate Why are quantum computers faster than classical computers?
- VforVendetta
- · Replies 38 ·
Graduate Can a particle in an infinite square well have degenerate energy eigenstates?
- Joydeep Munshi
- · Replies 4 ·
Graduate Understanding Electron Movement with Heisenberg's Uncertainty Principle
- jaydnul
- · Replies 6 ·
Graduate Principal quantum number n is an integer, Why?
- TAMAL DEY
- · Replies 6 ·
Graduate Why Does Zitterbewegung Imply Double the Expected Relativistic Energy?
- jk22
- · Replies 1 ·
Graduate What is the Lagrangian of a photon?
- exmarine
- · Replies 9 ·
Graduate Practical stuff in quantum physics
- Demystifier
- · Replies 3 ·
Graduate Probability over universe = 0 or 1?
- nomadreid
- · Replies 12 ·
Graduate Mathematics of entanglement in quantum erasers
- andrewkirk
- · Replies 14 ·
Graduate Do the Unruh effect and pressure explain boiling water in an accelerated teapot?
- naima
- · Replies 1 ·
Graduate Do wave functions go to zero at ~ct?
- Cadaei
- · Replies 5 ·
Graduate Why chiral fermions don't exist in odd dimensions?
- synoe
- · Replies 9 ·
Graduate Inner product for vector field in curved background
- Einj
- · Replies 2 ·
Graduate What does the g-factor, from say ESR, tell you?
- maverick_starstrider
- · Replies 3 ·
Graduate Can time be the single hidden variable in Bell's theorem?
- iamcj
- · Replies 34 ·
Graduate Why does the chemical potential stay below the ground state energy in a BEC?
- Coffee_
- · Replies 1 ·
Graduate I wonder what the name of this normalization process is
- td21
- · Replies 1 ·
Graduate Euclidean Feynman rules for QED
- andrex904
- · Replies 23 ·
Graduate Explanation of wave-particle picture, light
- VALENCIANA
- · Replies 4 ·
Graduate Hamiltonian in the position basis
- hokhani
- · Replies 10 ·
Graduate Entangled photons guiding two travelers to meet across galaxy
- Micheth
- · Replies 15 ·
Graduate The Uncertainty of Time in Quantum Mechanics
- newjerseyrunner
- · Replies 13 ·
Graduate Vacuum state Lorentz invariance
- Gvido_Anselmi
- · Replies 8 ·
Undergrad Transform from Magnitude of P to R
- Thinker301
- · Replies 2 ·
Undergrad Resting masses of isolated neutrons versus neutrons in atoms
- NotJimmy
- · Replies 3 ·
Graduate Product of two exponentials of different operators
- cpsinkule
- · Replies 3 ·
Graduate How Does Chirality Affect the Dirac Adjoint in Quantum Mechanics?
- synoe
- · Replies 1 ·
Graduate Are Additional Postulates Hidden in the Quantum Derivation from Galilei Algebra?
- andresB
- · Replies 9 ·
Graduate Does charge conjugation affect parity?
- silmaril89
- · Replies 2 ·
Graduate Eigenfunction/Eigenvalue question
- noahcharris
- · Replies 2 ·
Graduate Would an idea be a particle or a wave or both?
- Sksisme
- · Replies 5 ·
Graduate Why does not the graviton cause wavefunction collapse?
- Gerinski
- · Replies 10 ·
Graduate What is the physical definition of a state in quantum mechanics?
- lightarrow
- · Replies 6 ·
Graduate Why is superposition taught as necessary if pilot wave theory avoids it?
- member 529879
- · Replies 11 ·
Where can I get Casimir plates?
- Martin Sallberg
- · Replies 1 ·
Graduate Why do locality and unitarity imply non-zero vacuum energy?
- "Don't panic!"
- · Replies 5 ·
Graduate What is the collision probability for an energetic photon in free space?
- Ponderer
- · Replies 4 ·
Graduate How Do Tensor Products Model Multi-Particle Operators in Quantum Mechanics?
- cpsinkule
- · Replies 10 ·
Graduate What does Higgs partcle impart mass to?
- ynon
- · Replies 5 ·
Graduate Issue with integral in dimensional regularization
- Karatechop250
- · Replies 10 ·
Graduate Understanding Photon Polarization with Dirac's Principles of Quantum Mechanics
- forcefield
- · Replies 2 ·
Graduate Very basic question on Hamiltonian representation?
- askhetan
- · Replies 7 ·
Graduate Quantum fluctuations and order
- DeathbyGreen
- · Replies 9 ·
Graduate Collapse with and without measurement
- VALENCIANA
- · Replies 18 ·
Graduate Quantum oscillator from position to momentum space
- Dazed&Confused
- · Replies 2 ·
Graduate Why does the rate of transitions depend on the population of the ground state?
- marco1235
- · Replies 8 ·
Graduate Rotational Spectra of Diatomic Molecules
- Vaibhav DixiT
- · Replies 1 ·
Undergrad What causes paramagnetism and diamagnetism
- ColinD
- · Replies 1 ·
Graduate How Does the Quantum Monty Hall Problem Challenge Classical Probability?
- Nick666
- · Replies 5 ·
Graduate Definition of the Path Integral
- cpsinkule
- · Replies 2 ·
Graduate Computing Entanglement Entropy of CFTs in the Large-c Limit
- WannabeNewton
- · Replies 2 ·
High School Is the cat alive, dead, both or unknown
- Science2Dmax
- · Replies 260 ·
Graduate Is the wave function more like a soccer ball, or a golf ball
- BTBlueSkies
- · Replies 4 ·
Graduate Why is the greenhouse effect an analogy for quantum physics?
- avito009
- · Replies 2 ·
Graduate Does the photon wave function exist within the electron wave function?
- Checkster2323
- · Replies 11 ·
Undergrad How far apart can slits be in double slit experiment to still show interference?
- Pjpic
- · Replies 2 ·
High School Why does a hydrogen atom emit one photon instead of two or more?
- Ponderer
- · Replies 34 ·
Graduate Momentum Operator In Curved Spacetime
- Physicist97
- · Replies 5 ·
Undergrad Difference between "Spin" and "Angular Momentum"?
- avito009
- · Replies 14 ·
Graduate How Does Zee Simplify Integrals in QFT Derivations?
- Cadaei
- · Replies 4 ·
Undergrad What does Wave Function actually measure?
- avito009
- · Replies 4 ·
Graduate Unlearning / Relearning Feynman's 2-Boson Stuff?
- Swamp Thing
- · Replies 5 ·
Graduate No vibration spectrum for homonuclear diatomic molecules?
- bahamagreen
- · Replies 1 ·
Graduate Shankar- Simultaneous Diagonalisation of Hermitian Matrices
- bugatti79
- · Replies 1 ·
Graduate Cross Section Calc. in Peskin QFT - How to Deal with g^μν.g_μν?
- newgate
- · Replies 8 ·
High School Illusion that shell, subshell and orbitals are the same
- avito009
- · Replies 1 ·
Graduate Ballentine-sections 3.2 and 3.3
- WannabeNewton
- · Replies 44 ·
Graduate How is John Wheeler's quantum physics work viewed today?
- Feeble Wonk
- · Replies 15 ·
Graduate Can we violate Bell inequalities by giving up CFD?
- zonde
- · Replies 151 ·
Graduate Why do electrons have band widths or energy bands?
- Alex299792458
- · Replies 5 ·
Graduate Eigenvalue of lowering operator
- izzmach
- · Replies 3 ·
Graduate What's the unitary matrix equivalent to a beam splitter?
- Strilanc
- · Replies 2 ·
Graduate Why is B_III set to zero when calculating transmission and reflection amplitudes?
- hokhani
- · Replies 18 ·
Graduate Temporary dipole moments and energy conservation
- Danyon
- · Replies 2 ·
Graduate Ballentine's (3.49) and (3.50)
- andresB
- · Replies 1 ·
Graduate How Does QED Explain the Electromagnetic Force
- Physicist97
- · Replies 3 ·
Graduate Matrix form of Density Operator
- Peter Yu
- · Replies 3 ·
Graduate Equipartition of energy in Rayleigh-Jeans law
- vabite
- · Replies 5 ·
Undergrad Why does hydrogen show absorption lines in visible light without UV excitation?
- harman90
- · Replies 2 ·
Graduate Hamiltonian defined as 1st derivative
- forcefield
- · Replies 10 ·
Graduate What actually triggers the collapse of the wave function ?
- Cobalt101
- · Replies 8 ·
Graduate Quantum Mechanics - Induction Method
- izzmach
- · Replies 2 ·
Undergrad Is the Big Bang Theory the end of time, not beginning?
- Comfort_Cube
- · Replies 3 ·
Graduate What happened to the denominator?
- BiGyElLoWhAt
- · Replies 2 ·
Graduate Can single-photon excitation of distant atoms enable FTL communication?
- Swamp Thing
- · Replies 16 ·
Graduate Potential energy in strong- and weak- nuclear interaction
- olgerm
- · Replies 3 ·
Graduate Why does Schrödinger's equation contain mass, fixed numbers and infinite constants?
- Sruli
- · Replies 6 ·
Graduate Can future events affect the past?
- Jmeagle
- · Replies 57 ·
Graduate Comments - How Fundamental is the Arrow of Time?
- kreil
- · Replies 17 ·
Graduate Simple Harmonic Oscillator Zero Probability Points
- SSSUNNN
- · Replies 2 ·
Graduate What is the Concept of Colour Force in Quantum Physics?
- jeevesh
- · Replies 1 ·