The Inverted Dirac-Moshinsky Oscillator in $(1+1)$ Dimensions
We derive and analyze the exact solutions of the inverted Dirac-Moshinsky oscillator (IDMO) in $(1+1)$ dimensions, obtained from the standard model via the substitution $p \to p + imωβx$. The upper spinor component satisfies a Weber equation with complex spectral parameter $λ= (E^2-m^2)/(2mω)+i/2$, whose solutions are parabolic cylinder functions $D_ν(ξ)$ with complex order $ν= λ- 1/2$. The physical spectrum is purely continuous ($|E|>m$), with no discrete bound states. Three normalization schemes are developed, and the discrete Gamow resonances at $E_n^\pm = \pm\sqrt{m^2+(2n+1)mω-imω}$ are identified as poles of the resolvent. The negative-energy sector describes antiparticle anti-resonances whose positive imaginary part signals vacuum instability and spontaneous pair production, analogous to the Schwinger effect. The algebraic structure is governed by the principal series of $SU(1,1)$, and the Hamiltonian is $\mathcal{PT}$-symmetric with unbroken symmetry for $|E|>m$.