出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We analyze the low-lying spectrum and eigenmodes of lattice Dirac operators with a twisted mass
term. The twist term expels the eigenvalues from a strip in the complex plane and all eigenmodes
obtain a non-vanishing matrix element with g5. For a twisted Ginsparg-Wilson operator the spectrum
is located on two arcs in the complex plane. Modes due to non-trivial topological charge of
the underlying gauge eld have their eigenvalues at the edges of these arcs and obey a remnant
index theorem. For congurations in the conned phase we nd that the twist mainly affects the
zero modes, while the bulk of the spectrum is essentially unchanged.
