00. GENERAL
01.       Communication, education, history, and philosophy

01.10.-m  Announcements, news, and organizational activities
01.10.Cr  Announcements, news, and awards
01.10.Fv  Conferences, lectures, and institutes
01.10.Hx  Physics organizational activities

01.30.-y  Physics literature and publications
01.30.Bb  Publications of lectures (advanced institutes, summer
          schools, etc.)
01.30.Cc  Conference proceedings
01.30.Ee  Monographs and collections
01.30.Kj  Handbooks, dictionaries, tables, and data compilations
01.30.Mm  Textbooks for graduates and researchers
01.30.Pp  Textbooks for undergraduates
01.30.Rr  Surveys and tutorial papers; resource letters
01.30.Tt  Bibliographies

01.40.-d  Education
01.40.Di  Course design and evaluation
01.40.Ej  Science in elementary and secondary school
01.40.Gm  Curricula; teaching methods, strategies, and evaluation
01.40.Jp  Teacher training

01.50.-i  Educational aids
01.50.Fr  Audio and visual aids, films
01.50.Ht  Instructional computer use
01.50.Kw  Testing theory and techniques
01.50.My  Demonstration experiments and apparatus
01.50.Pa  Laboratory experiments and apparatus
01.50.Qb  Laboratory course design, organization, and evaluation
01.50.Te  Buildings and facilities
01.50.Wg  Physics of toys

01.52.+r  National and international laboratory facilities

01.55.+b  General physics

01.60.+q  Biographical, historical, and personal notes

01.65.+g  History of science

01.70.+w  Philosophy of science

01.75.+m  Science and society

01.80.+b  Physics of sports

01.90.+g  Other topics of general interest

02.       Mathematical methods in physics

02.10.-v  Logic, set theory, and algebra
02.10.By  Logic and foundations
02.10.Cz  Set theory
02.10.Eb  Combinatorics
02.10.Gd  Order, lattices, and ordered algebraic structures
02.10.Jf  General mathematical systems
02.10.Lh  Number theory
02.10.Nj  Algebraic number theory, field theory, and polynomials
02.10.Pk  Commutative rings and algebras
02.10.Rn  Algebraic geometry
02.10.Sp  Linear and multilinear algebra; matrix theory (finite
          and infinite)
02.10.Tq  Associative rings and algebras
02.10.Vr  Nonassociative rings and algebras
02.10.Ws  Category theory and homological algebra

02.20.-a  Group theory
          (for algebraic methods in quantum mechanics, see
          03.65.F; for symmetries in elementary particle physics,
          see 11.30)
02.20.Df  Finite groups
02.20.Fh  Infinite groups
02.20.Hj  Classical linear algebraic groups
02.20.Km  Abelian groups
02.20.Mp  Semigroups
02.20.Nq  Topological groups, general
02.20.Qs  General properties, structure, and representation of
          Lie groups
02.20.Rt  Discrete subgroups of Lie groups
02.20.Sv  Lie algebras of Lie groups
02.20.Tw  Infinite-dimensional Lie groups

02.30.-f  Function theory, analysis
02.30.Bi  Real functions
02.30.Cj  Measure and integration
02.30.Dk  Functions of a complex variable
02.30.Em  Potential theory
02.30.Fn  Several complex variables and analytic spaces
02.30.Gp  Special functions
02.30.Hq  Ordinary differential equations
02.30.Jr  Partial differential equations
02.30.Ks  Delay and functional equations
02.30.Lt  Sequences, series, and summability
02.30.Mv  Approximations and expansions
02.30.Nw  Fourier analysis
02.30.Px  Abstract harmonic analysis
02.30.Qy  Integral transforms and operational calculus
02.30.Rz  Integral equations
02.30.Sa  Functional analysis
02.30.Tb  Operator theory
02.30.Wd  Calculus of variations and optimal control

02.40.-k  Geometry, differential geometry, and topology
          (see also 04 Relativity and gravitation)
02.40.Dr  Euclidean and projective geometries
02.40.Ft  Convex sets and geometric inequalities
02.40.Hw  Classical differential geometry
02.40.Ky  Riemannian geometries
02.40.Ma  Global differential geometry
02.40.Pc  General topology
02.40.Re  Algebraic topology
02.40.Sf  Manifolds and cell complexes
02.40.Vh  Global analysis and analysis on manifolds

02.50.-r  Probability theory, stochastic processes, and
          statistics
          (see also 05 Statistical physics)
02.50.Cw  Probability theory
02.50.Ey  Stochastic processes
02.50.Fz  Stochastic analysis
02.50.Ga  Markov processes
02.50.Hb  Queuing theory
02.50.Kd  Foundations of statistics; sufficiency
02.50.Le  Decision theory and game theory
02.50.Ng  Distribution theory and Monte Carlo studies
02.50.Ph  Parametric inference
02.50.Rj  Nonparametric inference
02.50.Sk  Multivariate analysis
02.50.Vn  Linear inference
02.50.Wp  Inference from stochastic processes

02.60.-x  Numerical approximation and analysis
02.60.Cb  Numerical simulation; solution of equations
02.60.Dc  Numerical linear algebra
02.60.Ed  Interpolation; curve fitting
02.60.Gf  Algorithms for functional approximation
02.60.Jh  Numerical differentiation and integration
02.60.Lj  Ordinary and partial differential equations; boundary
          value problems
02.60.Nm  Integral and integrodifferential equations
02.60.Pn  Numerical optimization

02.70.-c  Computational techniques
02.70.Bf  Finite-difference methods
02.70.Dh  Finite-element and Galerkin methods
02.70.Fj  Finite-volume methods
02.70.Hm  Spectral methods
02.70.Jn  Collocation methods
02.70.Lq  Monte Carlo and statistical methods
02.70.Ns  Molecular dynamics and particle methods
02.70.Pt  Boundary-integral methods
02.70.Rw  Other computational methods

02.90.+p  Other topics in mathematical methods in physics

03.       Classical and quantum physics: mechanics and fields

03.20.+i  Classical mechanics of discrete systems: general
          mathematical aspects
          (for applied aspects of classical mechanics of discrete
          systems, see 46.10; for celestial mechanics, see
          95.10.C)

03.30.+p  Special relativity

03.40.-t  Classical mechanics of continuous media: general
          mathematical aspects
03.40.Dz  Mathematical theory of elasticity
          (see also 83.10 Continuum mechanics, 46.30 Structural
          mechanics of shells, plates, and beams, 62.20.D
          Elasticity of solids)
03.40.Gc  Fluid dynamics: general mathematical aspects
          (see also 47 Fluid dynamics)
03.40.Kf  Waves and wave propagation: general mathematical
          aspects
          (see also 62.30 Mechanical and elastic waves, 43.20
          General linear acoustics, 83.50.T, V--in rheology)

03.50.-z  Classical field theory
03.50.De  Maxwell theory: general mathematical aspects
          (for applied classical electrodynamics, see 41)
03.50.Kk  Other special classical field theories

03.65.-w  Quantum mechanics
          (see also 05.30 Quantum statistical mechanics)
03.65.Bz  Foundations, theory of measurement, miscellaneous
          theories (including Aharonov-Bohm effect, Bell
          inequalities, Berry's phase)
03.65.Ca  Formalism
03.65.Db  Functional analytical methods
03.65.Fd  Algebraic methods
          (see also 02.20 Group theory)
03.65.Ge  Solutions of wave equations: bound states
03.65.Nk  Nonrelativistic scattering theory
          (see also 03.80 General theory of scattering)
03.65.Pm  Relativistic wave equations
03.65.Sq  Semiclassical theories and applications

03.70.+k  Theory of quantized fields
          (see also 11.10 Field theory)

03.75.-b  Matter waves
03.75.Be  Atom and neutron optics
03.75.Dg  Atom and neutron interferometry
03.75.Fi  Phase coherent atomic ensemble (Bose condensation)

03.80.+r  General theory of scattering
          (see also 03.65.N Nonrelativistic scattering theory,
          11.55 S-matrix theory; analytic structure of
          amplitudes, and 11.80 Relativistic scattering theory)

04.       General relativity and gravitation
          (for relativistic cosmology, see 98.80.H)

......    Special relativity, see 03.30

04.20.-q  Classical general relativity
          (see also 02.40 Geometry and topology)
04.20.Cv  Fundamental problems and general formalism
04.20.Dw  Singularities and cosmic censorship
04.20.Ex  Initial value problem, existence and uniqueness of
          solutions
04.20.Fy  Canonical formalism, Lagrangians, and variational
          principles
04.20.Gz  Spacetime topology, causal structure, spinor structure
04.20.Ha  Asymptotic structure
04.20.Jb  Exact solutions

04.25.-g  Approximation methods; equations of motion
04.25.Dm  Numerical relativity
04.25.Nx  Post-Newtonian approximation; perturbation theory;
          related approximations

04.30.-w  Gravitational waves: theory
04.30.Db  Wave generation and sources
04.30.Nk  Wave propagation and interactions

04.40.-b  Self-gravitating systems; continuous media and
          classical fields in curved spacetime
04.40.Dg  Relativistic stars: structure, stability, and
          oscillations
          (for relativistic astrophysics, see 95.30.S)
04.40.Nr  Einstein-Maxwell spacetimes, spacetimes with fluids,
          radiation or classical fields

04.50.+h  Gravity in more than four dimensions, Kaluza-Klein
          theory, unified field theories; alternative theories of
          gravity
          (see also 11.25.M Compactification and four-dimensional
          models)

04.60.-m  Quantum gravity
          (see also 98.80.H Quantum cosmology)
04.60.Ds  Canonical quantization
04.60.Gw  Covariant and sum-over-histories quantization
04.60.Kz  Lower dimensional models; minisuperspace models
04.60.Nc  Lattice and discrete methods

04.62.+v  Quantum field theory in curved spacetime

04.65.+e  Supergravity
          (see also 12.60.J Supersymmetric models)

04.70.-s  Physics of black holes
          (for astrophysics of black holes, see 97.60.L)
04.70.Bw  Classical black holes
04.70.Dy  Quantum aspects of black holes, evaporation,
          thermodynamics

04.80.-y  Experimental studies of gravity
04.80.Cc  Experimental tests of gravitational theories
04.80.Nn  Gravitational wave detectors and experiments
          (see also 95.55.Y in Astronomical instrumentation)

04.90.+e  Other topics in general relativity and gravitation

05.       Statistical physics and thermodynamics
          (see also 02.50 Probability theory, stochastic
          processes, and statistics)

05.20.-y  Statistical mechanics
05.20.Dd  Kinetic theory
05.20.Gg  Classical ensemble theory

05.30.-d  Quantum statistical mechanics
05.30.Ch  Quantum ensemble theory
05.30.Fk  Fermion systems and electron gas
05.30.Jp  Boson systems

05.40.+j  Fluctuation phenomena, random processes, and Brownian
          motion

05.45.+b  Theory and models of chaotic systems

05.50.+q  Lattice theory and statistics; Ising problems
          (see also 64.60.C Order-disorder and statistical
          mechanics of model systems and 75.10.H Classical spin
          models)

05.60.+w  Transport processes: theory

05.70.-a  Thermodynamics
          (see also 64 Equations of state, phase equilibria, and
          phase transitions, and 65 Thermal properties of
          condensed matter; for chemical thermodynamics, see
          82.60)
05.70.Ce  Thermodynamic functions and equations of state
05.70.Fh  Phase transitions: general aspects
05.70.Jk  Critical point phenomena
05.70.Ln  Nonequilibrium thermodynamics, irreversible processes
          (see also 82.20.M Nonequilibrium kinetics, and 82.40.B
          Oscillations, chaos, and bifurcations in homogeneous
          nonequilibrium reactors)

05.90.+m  Other topics in statistical physics and thermodynamics

06.       Metrology, measurements, and laboratory procedures

06.20.-f  Metrology
06.20.Dk  Measurement and error theory
06.20.Fn  Units and standards
06.20.Jr  Determination of fundamental constants

06.30.-k  Measurements common to several branches of physics and
          astronomy
06.30.Bp  Spatial dimensions (e.g., position, lengths, volume,
          angles, displacements)
06.30.Dr  Mass and density
06.30.Ft  Time and frequency
06.30.Gv  Velocity, acceleration, and rotation

06.60.-c  Laboratory procedures
06.60.Ei  Sample preparation (including design of sample holders)
06.60.Jn  High-speed techniques (microsecond to femtosecond)
06.60.Mr  Testing and inspecting procedures
06.60.Sx  Positioning and alignment; manipulating, remote
          handling
06.60.Vz  Workshop procedures (welding, machining, lubrication,
          bearings, etc.)
06.60.Wa  Laboratory safety procedures
06.60.Yb  Other laboratory procedures

......    National and international laboratory facilities, see
          01.52

06.90.+v  Other topics in metrology, measurements, and laboratory
          procedures

07.       Instruments, apparatus, components, and techniques
          common to several branches of physics and astronomy
          (see also each subdiscipline for specialized
          instrumentation and techniques)

07.05.-t  Computers in experimental physics
......    Computer in physics education, see 01.50.H
......    Computational techniques, see 02.70--in mathematical
          methods in physics
......    Applications to optical system design, see 42.15.E
07.05.Bx  Computer systems: hardware, operating systems, computer
          languages, and utilities
07.05.Dz  Control systems
07.05.Fb  Design of experiments
07.05.Hd  Data acquisition: hardware and software
07.05.Kf  Data analysis: algorithms and implementation; data
          management
07.05.Mh  Neural networks, fuzzy logic, artificial intelligence
07.05.Pj  Image processing
          (see also 42.30.V in optics)
07.05.Rm  Data presentation and visualization: algorithms and
          implementation
07.05.Tp  Computer modeling and simulation
07.05.Wr  Computer interfaces
07.05.Ys  Other topics in computers in experimental physics

07.07.-a  General equipment and techniques
07.07.Df  Sensors (chemical, optical, electrical, movement, gas,
          etc.); remote sensing
07.07.Hj  Display and recording equipment, oscilloscopes, TV
          cameras, etc.
07.07.Mp  Transducers
07.07.Tw  Servo and control equipment; robots
07.07.Vx  Hygrometers
07.07.Yz  Other equipment and techniques

07.10.-h  Mechanical instruments, equipment, and techniques
07.10.Cm  Micromechanical devices and systems
          (see also 85.42 Nanotechnology)
07.10.Fq  Vibration isolation
07.10.Lw  Balance systems, tensile machines, etc.
07.10.Pz  Instruments for strain, force, and torque
07.10.Yg  Other mechanical instruments, equipment, and techniques
          (including pendulum, gyroscopes, centrifuges, etc.)

07.20.-n  Thermal instruments, apparatus, and techniques
07.20.Dt  Thermometry
07.20.Fw  Calorimetry
07.20.Hy  Furnaces; heaters
07.20.Ka  High-temperature techniques and instrumentation;
          pyrometry
07.20.Mc  Cryogenics, refrigerators; low-temperature techniques
07.20.Pe  Heat engines; heat pumps
07.20.Ym  Other thermal instruments and techniques

07.30.-t  Vacuum apparatus and techniques
          (see also 47.45 Rarefied gas dynamics)
07.30.Bx  Degasification, residual gas
07.30.Cy  Vacuum pumps
07.30.Dz  Vacuum gauges
07.30.Hd  Vacuum testing methods; leak detectors
07.30.Kf  Vacuum chambers, auxiliary apparatus, and materials

07.35.+k  High-pressure apparatus and techniques; shock tubes;
          diamond anvil cells

07.50.-e  Electrical and electronic components, instruments, and
          techniques
07.50.Ek  Circuits and circuit components
          (see also 85.20--in electrical and magnetic devices)
07.50.Hp  Electrical noise and shielding, interference
07.50.Ls  Electrometers
07.50.Qx  Signal processing electronics
07.50.Yd  Other electrical and electronic components,
          instruments, and techniques

07.55.-w  Magnetic components, instruments and techniques
07.55.Db  Generation of magnetic fields; magnets
          (see also 85.70.N--in magnetic devices)
07.55.Ge  Magnetometers for magnetic field measurements
07.55.Jg  Magnetometers for susceptibility, magnetic moment, and
          magnetization measurements
07.55.Nk  Magnetic shielding in instruments
07.55.Yv  Other magnetic instruments and techniques

07.57.-c  Infrared, submillimeter wave, microwave and radiowave
          instruments, equipment and techniques
          (for infrared and radio telescopes, see 95.55)
07.57.Hm  Infrared, submillimeter wave, microwave, and radiowave
          sources
07.57.Kp  Bolometers; infrared, submillimeter wave, microwave,
          and radiowave receivers and detectors
          (see also 85.60.G Photodetectors and infrared
          detectors)
07.57.Pt  Submillimeter wave, microwave and radiowave
          spectrometers; magnetic resonance spectrometers,
          auxiliary equipment, and techniques
07.57.Ty  Infrared spectrometers, auxiliary equipment, and
          techniques
07.57.Yb  Other infrared, submillimeter wave, microwave, and
          radiowave instruments, equipment, and techniques

07.60.-j  Optical instruments, equipment, and techniques
......    optical sources, see 42.72
......    Optical elements, devices, and systems 42.79
......    Photoelectric and optoelectric devices 85.60
......    Optical telescopes, see 95.55
07.60.Dq  Photometers, radiometers, and colorimeters
07.60.Fs  Polarimeters and ellipsometers
07.60.Hv  Refractometers and reflectometers
07.60.Ly  Interferometers
07.60.Pb  Conventional optical microscopes
          (for near-field scanning optical microscopes, see
          07.79.B)
07.60.Rd  Visible and ultraviolet spectrometers
07.60.Vg  Fiber-optic instruments
          (see also 42.81 Fiber optics)
07.60.Yi  Other optical instruments, equipment and techniques

07.64.+z  Acoustic instruments, equipment, and techniques
          (see also Acoustic Appendix)

07.68.+m  Photography, photographic instruments and techniques;
          xerography

07.75.+h  Mass spectrometers and related techniques

07.77.-n  Atomic, molecular, and charged-particle sources and
          detectors
07.77.Gx  Atomic and molecular beam sources and detectors
07.77.Ka  Charged-particle beam sources and detectors

07.78.+s  Electron, positron, and ion microscopes, electron
          diffractometers, and related techniques

07.79.-v  Scanning probe microscopes, components, and techniques
07.79.Cz  Scanning tunneling microscopes
07.79.Fc  Near-field scanning optical microscopes
07.79.Lh  Atomic force microscopes
07.79.Pk  Magnetic force microscopes
07.79.Sp  Friction force microscopes

07.81.+a  Electron, ion spectrometers, and related techniques

07.85.-m  X- and gamma-ray instruments and techniques
          (for x- and gamma-ray telescopes, see 95.55.K)
07.85.Fv  X- and gamma-ray sources, mirrors, gratings, and
          detectors
07.85.Jy  Diffractometers
07.85.Nc  X-ray and gamma-ray spectrometers
07.85.Qe  Synchrotron radiation instrumentation
07.85.Yk  Other x-ray and gamma-ray instruments and techniques

07.87.+v  Spaceborne and space research instruments, apparatus,
          and components (satellites, space vehicles, etc.)

07.88.+y  Instruments for environmental pollution measurements

07.89.+b  Environmental effects on instruments (e.g., radiation
          and pollution effects)

07.90.+c  Other topics in instruments, apparatus, components, and
          techniques common to several branches of physics and
          astronomy