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- C. Glienke, O.L. Pereira, D. Stringari, J. Fabris, V. Kava-Cordeiro, L. Galli-Terasawa +4 others
- Persoonia
- 2011

We investigated the identity and genetic diversity of more than 100 isolates belonging to Phyllosticta (teleomorph Guignardia), with particular emphasis on Phyllosticta citricarpa and Guignardia mangiferae s.l. occurring on Citrus. Phyllosticta citricarpa is the causal agent of Citrus Black Spot and is subject to phytosanitary legislation in the EU. This… (More)

- F G Alvarenga, A B Batista, J C Fabris, G T Marques
- 2009

The surface gravity for the extreme Reissner-Nordström black hole is null suggesting that it has a zero temperature. The direct evaluation of the Bogolubov's coefficients indicates that the temperature of the extreme black hole is ill definite: The Bogolubov's coefficients obtained by performing the usual analysis of a collapsing model of a thin shell do… (More)

- R. Colistete, J. C. Fabris
- 2008

The type Ia supernovae observational data are used to estimate the parameters of a cosmological model with cold dark matter and the Chaplygin gas. This exotic gas, which is characterized by a negative pressure varying with the inverse of density, represents in this model the dark energy responsible for the acceleration of the Universe. The Chaplygin gas… (More)

- J. C. Fabris
- 2008

We study the fate of density perturbations in an Universe dominate by the Chaplygin gas, which exhibit negative pressure. We show that it is possible to obtain the value for the density contrast observed in large scale structure of the Universe by fixing a free parameter in the equation of state of this gas. The negative character of pressure must be… (More)

- K A Bronnikov, M S Chernakova, J C Fabris, N Pinto-Neto, M E Rodrigues
- 2006

We study Einstein gravity minimally coupled to a scalar field in a static, spherically symmetric space-time in four dimensions. Black hole solutions are shown to exist for a phantom scalar field whose kinetic energy is negative. These " scalar black holes " have an infinite horizon area and zero temperature T H and are termed " cold black holes " (CBHs).… (More)

The dynamics of density and metric perturbations is investigated for the previously developed model where the decay of the vacuum energy into matter (or vice versa) is due to the renormalization group (RG) running of the cosmological constant (CC) term. The evolution of the CC depends on the single parameter ν, which characterizes the running of the CC… (More)

- J. C. Fabris
- 2002

The mass power spectrum for a Universe dominated by the Chaplygin gas is evaluated numerically from scales of the order of the Hubble horizon to 100 M pc. The results are compared with a pure baryonic Universe and a cosmological constant model. In all three cases, the spectrum increases with k, the wavenumber of the perturbations. The slope of the spectrum… (More)

- J. C. Fabris
- 2000

In the very early Universe matter can be described as a conformal invariant ultra-relativistic perfect fluid, which does not contribute, on classical level, to the evolution of the isotropic and homogeneous metric. However, in this situation the vacuum effects of quantum matter fields become important. The vacuum effective action depends, essentially, on… (More)

- J. C. Fabris
- 1998

In the very early Universe the matter may be described by the free radiation, that is by the set of massless fields with negligible interactions between them. Then the dominating quantum effect is the trace anomaly which comes from the renormalization of the conformal invariant part of the vacuum action. The anomaly-induced effective action can be found… (More)

- K A Bronnikov, J C Fabris, N Pinto-Neto, M E Rodrigues
- 2008

We study Einstein gravity coupled to a massless scalar field in a static spherically symmetric space-time in four dimensions. Black hole solutions exist when the kinetic energy of the scalar field is negative, that is, for a phantom field. These " scalar black holes " have an infinite horizon area and zero temperature. They are related through a conformal… (More)