feynlag.fields.DiracFermion

class feynlag.fields.DiracFermion(*args, **kwargs)

Four-component fermion (both chiralities) — not yet supported.

A genuine 4-component field would need its own mass-sector and diagonalization path validated against physics; the library deliberately represents Dirac/vector-like fermions as TWO WeylFermions with identical reps (one chirality='L', one 'R') so every stage reuses the tested Weyl machinery — see examples/sm_vll.py. Constructing this class raises rather than silently producing unverified vertices.

__init__(*args, **kwargs)

Methods

__init__(*args, **kwargs)
bar(component)	The ψ̄ IndexedBase matching a gauge component.
charge(u1_group)	U(1) charge of this field (0 if not charged under it).
dag()	Hermitian conjugate of the component column: a row Matrix.
generators(group)	Generator matrices of group acting on this field's FULL component space (Kronecker product over all non-abelian reps).

Attributes

dim	Total number of gauge components (product over non-abelian reps).
spin
bar_components	Dirac adjoints ψ̄, one IndexedBase per gauge component
mat	column matrix of components — use in matrix expressions.