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 Lagrangian of a Photon: Understanding the Fundamental Particle in Light
- 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 Understanding the Unruh Effect on Accelerated Teapots and Boiling Water
- 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 Understanding Bell Theorem: A Noob's Perspective
- iamcj
- · Replies 34 ·
Graduate BEC question about number of excited particles
- 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 "information" sent faster than light (....not)
- 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 Pilot Wave Theory: A Different Perspective on Quantum Mechanics
- member 529879
- · Replies 11 ·
Where can I get Casimir plates?
- Martin Sallberg
- · Replies 1 ·
Graduate Locality, unitarity & 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 Quantum Physics behind the greenhouse effect.
- avito009
- · Replies 2 ·
Graduate Wave function of multiple particles
- Checkster2323
- · Replies 11 ·
Undergrad How far apart can slits be in double slit experiment to still show interference?
- Pjpic
- · Replies 2 ·
High School Energy Levels in Hydrogen: Calculating Photon Energy & Wavelength
- 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 John Wheeler's Legacy: A Look at His Impact on Physics
- 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 Transmission and Reflection amplitude
- 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 Hydrogen Spectra: Absorbtion in White Light Explained
- 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 Excitation of two-atom state by single photon : FTL hope?
- Swamp Thing
- · Replies 16 ·
Graduate Potential energy in strong- and weak- nuclear interaction
- olgerm
- · Replies 3 ·
Graduate Schrödinger Eq: Questions on Mass, Uncertainty & Pi
- 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 ·
Graduate Indivisible units of time and the quantum eraser experiment
- Gaz1982
- · Replies 4 ·
Undergrad Why is information that cannot be seen called entropy?
- td21
- · Replies 2 ·
Graduate What is the derivation for the vacuum density of states in the Purcell effect?
- Zarqon
- · Replies 1 ·
Graduate Calculating the Average Value of Square Spin for a Composite System
- Gvido_Anselmi
- · Replies 3 ·
Graduate Are Neutrinos Tachyons? The Mystery of Massless Particles Explained
- LarryS
- · Replies 17 ·
Graduate Do we need quantum mechanics to explain biological stuff?
- VforVendetta
- · Replies 2 ·
Graduate QM Sankar 2nd edition -- gram schmidt process on example 1.3.2
- bugatti79
- · Replies 2 ·
Undergrad Is matrix hermitian and its eigenvectors orthogonal?
- bugatti79
- · Replies 7 ·
Graduate Double Slit Question: Path Information & Observer's Experiences
- Gerinski
- · Replies 11 ·
Graduate Unruh Effect: Instantly Gaining Information from Acceleration
- tzimie
- · Replies 8 ·
Graduate Clarifying the Meaning of "Random" in Quantum Physics
- ScientificMind
- · Replies 56 ·
Graduate Quantum conditions for position and momentum operators
- _Kenny_
- · Replies 3 ·
Graduate What is the Schmidt Rank and Its Role in Measuring Entanglement?
- valesdn
- · Replies 3 ·
Graduate What is the wave function for the whole system/atom ?
- Quandemonitum
- · Replies 3 ·