# Fingerprint Dive into the research topics where So Hirata is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

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### Chemical Compounds

Electron correlations

Density functional theory

Potential energy surfaces

Wave functions

Polyacetylenes

Excited states

Electrons

Excitation energy

Molecules

Equations of motion

Vibrational spectra

Correlation methods

Green's function

Electronic structure

Molecular vibrations

Quantum chemistry

Polymers

Crystals

Polyethylene

Hydrofluoric Acid

Ground state

Tensors

Infrared radiation

Ionization potential

Hamiltonians

Inelastic neutron scattering

Costs

Molecular crystals

Band structure

Algebra

Electron affinity

Water

Geometry

Cations

Ice

Point groups

Stretching

Oligomers

Monte Carlo methods

Taylor series

Correlation theory

Temperature

Crystal symmetry

Conjugated polymers

Crystalline materials

Formaldehyde

Polycyclic Aromatic Hydrocarbons

Coulomb interactions

Phonons

Hydrogen

### Physics & Astronomy

#### Physics

perturbation

orbitals

electrons

potential energy

equations of motion

wave functions

quantum chemistry

gradients

harmonics

ground state

electron affinity

cations

#### General

energy

density functional theory

configuration interaction

electronics

self consistent fields

polyacetylene

vibration

electronic structure

Green's functions

costs

operators

crystals

polyethylenes

expansion

evaluation

contraction

field theory (physics)

grids

Feynman diagrams

diagrams

fragments

functionals

#### Mathematical and Computer Sciences

perturbation theory

approximation

tensors

algebra

Taylor series

theorems

#### Engineering

excitation

energy bands

inelastic scattering

#### Chemistry and Materials

polymers

molecules

hydrofluoric acid

polyatomic molecules

polycyclic aromatic hydrocarbons

carbon dioxide

#### Aerospace Sciences

Brillouin zones