A1. Active Galactic Nuclei
A2. Galaxies and Clusters
A3. Supernovae, Gamma-Ray Bursts, and other Transients
A4. Stars and the Interstellar Medium
A5. Space and Plasma Astrophysics
A6. Pulsars, Neutron Stars, and Black Holes
A7. Supernova Remnants
A8. Other Galactic Sources
A9. Cosmic Rays
A10. Cosmology / Early Universe / Dark Energy
A11. Exoplanets
A12. Elementary Particles/Dark Matter
A13. Gravitational Wave Astronomy
A14. Neutrino Astronomy
A15. Solar Physics
A16. Planetary Physics
A17. Missions, Instruments, and Surveys
A18. Data Analysis and Modeling Techniques, Astroinformatics and Astrostatistics
A19. Physics of the Cosmos Minisymposium
A20. Other Minisymposia
A21. Focus Session: Optical Counter-parts to Gravitational Wave Events (same as C 14)
A22. Focus Session: NICER (same as C15)

B1. Few-body systems: general theory and computational methods (same as Q5)
B2. Few-body systems: atoms & molecules
B3. Few-body systems: hadrons and light nuclei
B4. Few-body dynamics in many-body systems

C1. Quantum Aspects of Gravitation
C2. Gravitational Waves: Detectors and Instrumentation
C3. Gravitational Waves: Source Modeling
C4. Gravitational Waves: Data Analysis Techniques
C5. Gravitational Waves: Searches and Detected Signals
C6. Analytical Calculations and Approximations in General Relativity
C7. Alternative Theories of Gravity
C8. Numerical Relativity: Black Hole Binaries (same as L8)
C9. Numerical Relativity: Neutron Stars and Other Sources with Matter (same as L9)
C10. Numerical Relativity: Algorithms and Code Development (same as L10)
C11. Mathematical Aspects of General Relativity
C12. Gravitation and Astrophysics
C13. Tests of General Relativity and Gravitation
C14. Focus Session: Optical Counter-parts to Gravitational Wave Events (same as A21)
C15. Focus Session: NICER (same as A22)

D1. Nuclear Astrophysics
D2. Electroweak Interactions
D3. Neutrino Physics
D4. Electromagnetic Interactions
D5. Ultrarelativistic Heavy-Ions
D6. Nuclear Reactions: Heavy-Ions/Rare isotope Beams
D7. Nuclear Reactions: Hadrons/Light Ions
D8. Nuclear Structure
D9. Hadronic Physics
D10. Nuclear Theory
D11. Nuclear Isotopes
D12. Instrumentation
D13. Applications of Nuclear Physics
D14. Mini-Symposia
D14a. Mini-Symposium on Initial State and Early-time Dynamics of Heavy Ion Collisions
D14b. Mini-Symposium on Probing High Baryon Density Physics
D14c. Mini-symposium on FRIB and ReA Instrumentation
D14d. Mini-Symposium on Low Radioactivity Background Techniques in Underground Experiments
D15. Other

E1. Light Mesons and Baryons
E2. Heavy Flavor Hadrons
E3. Nucleon structure and nucleon spin
E4. QCD Effects in Medium

F1. Higgs Physics
F2. Electroweak Physics
F3. Top-Quark Physics
F4. Quark Flavor Physics
F5. Charged Lepton Interactions
F6. Neutrino Physics: Results and New Initiatives
F7. Neutrino Experiments: Backgrounds, Systematic Errors and Simulations
F8. Strong Interactions and Hadron Physics
F9. Supersymmetry Searches and Models
F10. Alternative Beyond the Standard Model Physics
F11. Dark Sector Theories and Searches
F12. Particle Cosmology
F13. Theoretical Results
F14. Detector R&D and Performance
F15. Computing and Data Handling (same as Q6)

G1. Basic Symmetries
G2. Fundamental Constants
G3. General and Special Relativity
G4. Quantum Mechanics
G5. Other Precision Tests

H1. Synchrotron Radiation Sources and Damping Rings
H2. Free Electron Laser Physics
H3. Gyrotron Physics
H4. Conventional Source Physics
H5. Radiation Sources, Other

I1. High Energy Particle Accelerators and Colliders
I2. Low and Intermediate Energy Accelerators and Storage Rings
I3. Linear Accelerators
I4. Cyclotrons
I5. Electrostatic Accelerators
I6. Particle Sources
I7. New Acceleration Methods
I8. Pulsed Power and High Current Accelerators
I9. Special Purpose Accelerators (Medical, Energy Production, Industrial, Defense, Spallation Neutron Sources)
I10. Accelerators and Storage Rings, Other
I11.   Computational beam and accelerator physics (same as J11, Q11)

J1. Linear Beam Dynamics
J2. Nonlinear Beam Dynamics
J3. Multiparticle Dynamics
J4. Beam Instabilities
J5. Beam Interaction with Electromagnetic Radiation
J6. Beam Interaction with Matter
J7. High Current Beams
J8. Photon Beams
J9. Beam Beam Interaction
J10. Beam Physics, Other
J11. Computational beam and accelerator physics (same as I11, Q11)

K1. Beam Diagnostics and Control
K2. RF Technology and Systems
K3. Magnet Technology and Systems
K4. Power Sources
K5. Beam Targets and Secondary Beams
K6. Beam Transport and Propagation
K7. Injection and Extraction
K8. Accelerator Systems, Other

L1. Simulation Methods and Implementation
L2. Large-Scale Data and Simulations
L3. The Impact of New and Emerging Architectures on Computational Physics
L4. Education in Computational Physics, from K-12 to Graduate Level
L5. Few-body systems: general theory and computational methods (same as B2)
L6. Particles and Fields: Computing and Data Handling (same as F15)
L7. Lattice QCD
L8. Numerical Relativity: Black Hole Binaries (same as C8)
L9. Numerical Relativity: Neutron Stars and Other Sources with Matter (same as C9)
L10. Numerical Relativity: Algorithms and Code Development (same as C10)
L11. Computational beam and accelerator physics (same as I11, J11)

M1. Energy production (Fossil, Renewable, Nuclear, etc.)
M2. Energy storage and distribution
M3. Energy utilization (transportation, buildings, etc.)
M4. Societal issues related to energy
M5. Other energy research topics

N1. K-12 Education
N2. Informal Education and Public Outreach (FOEP)
N3. Graduate Education
N4. Education and Public Policy
N5. Professional Development
N6. K-12 Teacher Preparation
N7. Undergraduate Education

P1. Assessment
P2. Concepts & Principles
P3. Diversity & Inclusion
P4. Educational policy
P5. Epistemology, attitudes, & beliefs
P6. Instructional materials development
P7. Instructional strategies
P8. Learning environment
P9. Learning theory
P10. Research methodology
P11. Scientific reasoning & problem solving
P12. Student preparation
P13. Technology

All topics

R1. National Facilities
R2. Public Policy
R3. History of Physics
R4. International Issues: Programs, Collaborations, AND Exchanges
R5. Outreach and Engaging the Public (FOEP)