27 citations · 35 across the 2 of their papers we have counts for
4 papers
The quantum theory of scalar fields on the de Sitter expanding universe
Ion I. Cotaescu, Cosmin Crucean, Adrian Pop
New quantum modes of the free scalar field are derived in a special time-evolution picture that may be introduced in moving charts of de Sitter backgrounds. The wave functions of t…
Infinite loop superalgebras of the Dirac theory on the Euclidean Taub-NUT space
Ion I. Cotaescu, Mihai Visinescu
The Dirac theory in the Euclidean Taub-NUT space gives rise to a large collection of conserved operators associated to genuine or hidden symmetries. They are involved in interestin…
Generalized "bra-ket" formalism
Ion I. Cotaescu
The Dirac's bra-ket formalism is generalized to finite-dimensional vector spaces with indefinite metric in a simple mathematical context similar to thatof the theory of general ten…
The Dirac equation in Cartesian gauge
Ion I. Cotaescu
It is shown that in the case of the spherically symmetric static backgrounds there is a gauge in which the Dirac equation is manifestly covariant under rotations. This allows us to…