feynlag.fields.Fermion

class feynlag.fields.Fermion(name, reps=None, component_names=None, chirality=None, nflavors=1, self_conjugate=False, tex=None)

Spin-1/2 field with chirality and flavor structure.

Components are IndexedBase objects: psi[i] is flavor i of a gauge component. Full fermionic dynamics (bilinear vertex extraction, SVD/Takagi diagonalization) arrive in Phase 4; the declaration layer already supports invariance checking through the gauge representations.

__init__(name, reps=None, component_names=None, chirality=None, nflavors=1, self_conjugate=False, tex=None)

Methods

__init__(name[, reps, component_names, ...])
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.