179 research outputs found
Non-standard Dirac adjoint spinor: The emergence of a new dual
In this present communication we provide a new derivation of the Dirac dual
structure by employing a different approach from the originally proposed.
Following a general and rigorous mathematical process to compute the dual
structure, we investigate if is possible to break the existing "rigidity" in
its primordial formulation. For this task, firstly, we look towards to
understand the core of the Dirac spinors construction and then, we suggest to
built an alternative dual structure for the Dirac spinor, which preserve an
invariant norm under any transformation. Finally, we verify
if the prominent physical contents are maintained or if it is affected by such
construction.Comment: 7 pages, 0 figure
Spin-half bosonic classification
In this paper, we define a new spinor classification that encompasses the
recently proposed spin-half bosons with mass dimension three-half. As it will
be shown, these particles, which are governed by a first-order equation and
consequently provide a local theory, belong to a specific subclass of class-2
spinors within the bosonic classification, playing a similar role to Dirac
spinors within the Lounesto classification. Such bosonic classification is
shown to be closely connected with the usual fermionic Lounesto classification,
and thus, evincing a symmetry between Dirac fermions and spin-half bosons.Comment: 5 page
Effective lagrangian for a mass dimension one fermionic field in curved spacetime
In this work we use momentum-space techniques to evaluate the propagator
for a spin mass dimension one spinor field on a curved
Friedmann-Robertson-Walker spacetime. As a consequence, we built the one-loop
correction to the effective lagrangian in the coincidence limit. Going further
we compute the effective lagrangian in the finite temperature regime. We arrive
at interesting cosmological consequences, as time-dependent cosmological
`constant', fully explaining the functional form of previous cosmological
models.Comment: 9 pages, 0 figure
Type-4 spinors: transmuting from Elko to single-helicity spinors
In this communication we briefly report an unexpected theoretical discovery
which emerge from the mapping of Elko mass-dimension-one spinors into single
helicity spinors. Such procedure unveils a class of spinor which is classified
as type-4 spinor field within Lounesto classification. In this paper we explore
the underlying physical and mathematical contents of the type-4 spinor.Comment: 9 pages, 0 figure
On the bilinear covariants associated to mass dimension one spinors
In this paper we approach the issue of Clifford algebra basis deformation,
allowing for bilinear covariants associated to Elko spinors which satisfy the
Fierz-Pauli-Kofink identities. We present a complete analysis of covariance,
taking into account the involved dual structure associated to Elko. Moreover,
the possible generalizations to the recently presented new dual structure are
performed.Comment: 9 pages, 0 figure
Singular spinors as expansion coefficients of local spin-half fermionic and bosonic fields
By scrutinizing the singular sector of the Lounesto spinor classification, we
investigate the correct definition of the expansion coefficient functions of
local fermionic fields within a fully Lorentz covariant theory. As we can
observe, a careful definition of the adjoint structure, directed towards local
fields, maps singular spinors into class-2 according to a general spinor
classification. Furthermore, we investigate all the necessary mathematical
tools for constructing local fermionic and bosonic fields and provide insights
into the physical implications for the other singular classes. Besides, we also
show that incorporating \emph{Wigner degeneracy} maintains the rotational
symmetry formalism working in general.Comment: 14 page
On the Spinor Representation
A systematic study of the spinor representation by means of the fermionic
physical space is accomplished and implemented. The spinor representation space
is shown to be constrained by the Fierz-Pauli-Kofink identities among the
spinor bilinear covariants. A robust geometric and topological structure can be
manifested from the spinor space, wherein, for instance, the first and second
homotopy groups play prominent roles on the underlying physical properties,
associated to the fermionic fields.Comment: 16 page
- …