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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Undergrad What is the difference between virtual and real particles in string theory?
- Souhardya Nandi
- · Replies 10 ·
High School Gravity and spin 2 representation
- jk22
- · Replies 1 ·
Undergrad Source of energy for quantum tunneling of a particle
- SameerTahir
- · Replies 27 ·
Graduate What Are the Average Tunneling Electron Energies in a Ti/Nb2O5/Ti MIM Device?
- PhilQ
- · Replies 6 ·
High School Biggest Bosenova: Milligram Range Feasible?
- stefanbanev
- · Replies 6 ·
Undergrad Wheeler's delayed choice doesn't change the past
- Alfredo Tifi
- · Replies 157 ·
Undergrad Field operators and the uncertainty principle
- phoenix95
- · Replies 8 ·
Undergrad Quantum nonlocality and entanglement
- Spar
- · Replies 3 ·
Undergrad What does a zero-value of the Born-condition mean?
- SeM
- · Replies 30 ·
Undergrad Noncommuting observables and indeterminacy principle
- microsansfil
- · Replies 6 ·
Undergrad Is this a Stirling number of the second kind?
- HAYAO
- · Replies 2 ·
Undergrad Principles of a Second Quantum Mechanics
- microsansfil
- · Replies 5 ·
Graduate Mathematical Quantum Field Theory - Propagators - Comments
- Urs Schreiber
- · Replies 6 ·
Undergrad Does light exist between events?
- bremsstrahlung
- · Replies 6 ·
Graduate Mathematical Quantum Field Theory -- Equations? So what?
- John1945
- · Replies 7 ·
Graduate Mathematical Quantum Field Theory - Symmetries - Comments
- Urs Schreiber
- · Replies 9 ·
Graduate Mathematical Quantum Field Theory - Phase Space - Comments
- Urs Schreiber
- · Replies 7 ·
Graduate Solving the Schrödinger equation for free electrons
- SeM
- · Replies 2 ·
Graduate What are typical initial conditions for the Schrödinger eq?
- SeM
- · Replies 5 ·
Undergrad What is the difference between cfd and realism?
- entropy1
- · Replies 26 ·
Undergrad Eigenvectors - eigenvalues mappings in QM
- LarryS
- · Replies 2 ·
Undergrad Measuring particles through experiments
- _PJ_
- · Replies 13 ·
Undergrad What is the value of "delayed choice" experiments?
- MichPod
- · Replies 25 ·
High School Preserving local realism in the EPR experiment
- kurt101
- · Replies 81 ·
Graduate Why do space translations satisfy the Wigner's Theorem?
- NessunDorma
- · Replies 7 ·
Undergrad How elementary particles form matter
- LeInvertedPenguine
- · Replies 4 ·
Undergrad Why is a cavity radiator a perfect black body emitter?
- kal
- · Replies 9 ·
Undergrad Einstein's View of Quantum Mechanics
- bhobba
- · Replies 43 ·
Undergrad Does measurement destroy the interference pattern in the 2-slit experiment?
- Kostik
- · Replies 12 ·
Graduate Mathematical Quantum Field Theory - Gauge Fixing - Comments
- Urs Schreiber
- · Replies 1 ·
Undergrad Superposition state and wavefunction collapse
- dyn
- · Replies 13 ·
High School Is Quantum Interference Evidence of Multiple Universes?
- TheQuestionGuy14
- · Replies 74 ·
High School Deriving the Schrödinger equation from the Laplacian form
- Joao
- · Replies 5 ·
Graduate QM: Probability of measuring momentum
- WWCY
- · Replies 2 ·
Undergrad Hilbert space and conjugate of a wave function
- amjad-sh
- · Replies 17 ·
Undergrad Solving Dirac Algebra Arithmetic
- 43arcsec
- · Replies 1 ·
Undergrad Why this system has a rotational symmetry in Dirac equation?
- winding bird
- · Replies 2 ·
High School Does Quantum Immortality really mean we are immortal?
- TheQuestionGuy14
- · Replies 5 ·
Undergrad Momentum Entanglement: The Technicalities and Usage in Electron Experiments
- ftr
- · Replies 3 ·
Undergrad Computing CHSH violation bound
- facenian
- · Replies 7 ·
High School How and why do electron quantum numbers affect bonding?
- Hallucinogen
- · Replies 11 ·
Undergrad Infinitely strong magnetic field
- Hami Hashmi
- · Replies 7 ·
Graduate How high of atomic number to get g-block electrons?
- swampwiz
- · Replies 2 ·
Undergrad Path bending in Feynman's QED reflection explanation
- Swamp Thing
- · Replies 6 ·
Undergrad Quantum field theory and the hydrogen atom
- arupel
- · Replies 7 ·
High School Two Confusing Entanglement Scenarios
- Isaac0427
- · Replies 9 ·
Undergrad Can individual photons be directly observed?
- ftr
- · Replies 12 ·
Undergrad Are force-mediating particles real or just perturbative artifacts?
- ftr
- · Replies 15 ·
Graduate Does a wavefunction in a cartesian system create a one-dimensional subspace?
- SeM
- · Replies 11 ·
Undergrad Negative and Positive energy modes of KG equation
- bananabandana
- · Replies 1 ·
High School Does gravity affect quantum transition amplitudes?
- Aidyan
- · Replies 5 ·
Undergrad How Can Quantum Optics Model Gradually Varying Loss in Optical Media?
- Swamp Thing
- · Replies 1 ·
Undergrad Heuristic for simple two-photon scattering problems
- Swamp Thing
- · Replies 1 ·
Undergrad How does QFT handle particle creation and conversion?
- ftr
- · Replies 3 ·
Undergrad How do you find the inverse of field transformations in Noether's theorem?
- facenian
- · Replies 7 ·
High School Planck-Einstein relation and the Photoelectric Effect
- Abu
- · Replies 3 ·
High School Does detecting which path a charged particle takes alter the field everywhere?
- Vendicar Decarian
- · Replies 16 ·
Undergrad Why don't soft photons cause infrared divergences in total energy?
- asimov42
- · Replies 2 ·
Undergrad QM Assumptions Regarding Entanglement Properties
- Dadface
- · Replies 112 ·
Undergrad Partition functions for fermion gas in stat mechanics vs Dirac QFT
- Iliody
- · Replies 5 ·
Graduate Is Normalizing a 4x4 Matrix Possible Using Multiple Methods?
- wondering12
- · Replies 2 ·
Undergrad Does 'Phase Inversion' grow exponentially?
- Ricardo Belchior
- · Replies 11 ·
Graduate Collision integral approximation in boltzmann equation
- mertcan
- · Replies 8 ·
Undergrad 2D LHO calculate ground state energy
- Das apashanka
- · Replies 8 ·
Undergrad Self education: how to proceed from QM to QFT?
- MichPod
- · Replies 22 ·
Graduate Is there an alternative form of the zero point energy?
- SeM
- · Replies 14 ·
High School Kim et al, 1999 experiment and causality
- Joao
- · Replies 28 ·
Undergrad How energy of light is conserved when passing through medium
- Gevorg
- · Replies 3 ·
Undergrad Why does the neutron lifetime seem surprisingly long?
- tzimie
- · Replies 6 ·
Graduate Schouten identity resembles Jacobi identity
- MathematicalPhysicist
- · Replies 3 ·
High School Could a bouncing particle theory explain quantum behavior?
- Martin Rousev
- · Replies 1 ·
High School Correct English convention for |Psi|^2?
- Aidyan
- · Replies 4 ·
Undergrad Can phase shifts δl be calculated in scattering theory?
- Ado
- · Replies 2 ·
Undergrad Is Detailed Balance Satisfied in a Two-State System in Quantum Mechanics?
- cozycoz
- · Replies 1 ·
Graduate Derivation of the Casimir energy in flat space
- highflyyer
- · Replies 3 ·
Graduate How spin projector got included in inverse of Matrix?
- wondering12
- · Replies 1 ·
Undergrad Angular momentum state of a system
- yamata1
- · Replies 6 ·
Undergrad Why is the potential derivation in Zee's QFT in a nutshell not true QFT?
- ftr
- · Replies 4 ·
Insights The Vacuum Fluctuation Myth - Comments
- A. Neumaier
- · Replies 220 ·
Undergrad How to factorize the hydrogen atom Hamiltonian?
- yamata1
- · Replies 5 ·
High School Does Human Observation Affect the Double Slit Experiment Results?
- laymanB
- · Replies 99 ·
Undergrad Commutator of p and x/r: Elegant Derivation in Position Basis
- VKint
- · Replies 2 ·
High School Expanding space time and Virtual particles
- Mcbleak
- · Replies 6 ·
Graduate Generalizing distinguishability of photons on HOM dip?
- Cleber
- · Replies 1 ·
High School Spontaneous increase in energy level
- Getterdog
- · Replies 4 ·
Undergrad Meaning of Dirac Delta function in Quantum Mechanics
- Ibraheem
- · Replies 18 ·
Undergrad Why doesn't measuring a photon's polarization violate the no-clone theorem?
- fog37
- · Replies 9 ·
Graduate Fermi and Bose gas in statistical mechanics
- Sang-Hyeon Han
- · Replies 1 ·
Graduate Is the Nexus Graviton a Thing?
- Gort
- · Replies 4 ·
Undergrad Hidden dimensions and quadratic term of a free field
- victorvmotti
- · Replies 4 ·
Graduate Reasonable measurement of both coordinate and momentum?
- MichPod
- · Replies 3 ·
Undergrad Energy of an electron with Schrodinger's equation
- cc94
- · Replies 4 ·
Undergrad Operation on complex conjugate
- Thejas15101998
- · Replies 2 ·
Graduate Osterwalder-Schrader theorem and non-relativistic QM
- king vitamin
- · Replies 6 ·
Undergrad Concepts to understand Quantum Tunneling
- SameerTahir
- · Replies 5 ·
Undergrad Wave Function Collapse: Quantifying Quickness
- Thejas15101998
- · Replies 8 ·
Graduate Can imaginary position operators explain real eigenvalues in quantum mechanics?
- SeM
- · Replies 2 ·
High School Quantum Teleportation Question from a Curious 10 year old
- Jacques Marrot
- · Replies 14 ·
High School Why doesn't this FTL communication scheme work?
- Christofer Br
- · Replies 6 ·
Graduate Implications of violation of the Leggett–Garg inequality
- alphajoza
- · Replies 7 ·