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A model for the Universe is proposed whose constituents are: (a) a dark energy field modeled by a fermionic field non-minimally coupled with the gravitational field, (b) a matter field which consistsâ€¦ (More)

- Christos Constantinidis, F. P. Devecchi, F. Toppan
- 1998

Two-dimensional N = 1,2 supersymmetric chiral models and their dual extensions are introduced and canonically quantized. Working within a superspace formalism, the non-manifest invariance underâ€¦ (More)

In this work it is investigated if fermionic sources could be responsible for accelerated periods during the evolution of a universe where a matter field would answer for the decelerated period. Theâ€¦ (More)

- Christos Constantinidis, F. P. Devecchi, D. F. Marchioro
- 1999

In theories of gravitation the canonical hamiltonian is a linear combination of constraints, meaning that after gauge fixing it turns into a strongly zero quantity. This is in brief theâ€¦ (More)

- F. P. Devecchi, M. Fleck, H. O. Girotti, A. J. da Silva
- 1994

The Maxwell-Chern-Simons theory is canonically quantized in the Coulomb gauge by using the Dirac bracket quantization procedure. The determination of the Coulomb gauge polarization vector turns outâ€¦ (More)

- L. L. Samojeden, Gilberto Medeiros Kremer, F. P. Devecchi
- 2009

â€“ In this work we analyze the effects produced by bosonic and fermionic constituents, including quantum corrections, in two-dimensional (2D) cosmological models. We focus on a gravitational theoryâ€¦ (More)

- F. P. Devecchi, E. Facchini, +7 authors P. MariÃ±o
- International journal of cardiology. Heartâ€¦
- 2016

BACKGROUND
It has been reported that contractility, as assessed using dobutamine infusion, is independently associated with reverse remodeling after CRT. Controversy, however, exists about theâ€¦ (More)

By using the thermodynamic theory of irreversible processes and Einstein general relativity, a cosmological model is proposed where the early universe is considered as a mixture of a scalar fieldâ€¦ (More)

- F. P. Devecchi, H. O. Girotti
- 1993

We argue that a consistent quantization of the Floreanini-Jackiw model, as a constrained system, should start by recognizing the improper nature of the constraints. Then, each boundary conditionâ€¦ (More)

We discuss the Dirac quantization of two dimensional gravity with bosonic matter fields. After defining the extended Hamiltonian it is possible to fix the gauge completely. The commutators can all beâ€¦ (More)