Quantization of a Friedmann-Robertson-Walker model in N=1 Supergravity with Gauged Supermatter

The theory of N = 1 supergravity with gauged supermatter is studied in the context of a k = + 1 Friedmann minisuperspace model. It is found by imposing the Lorentz and supersymmetry constraints that there are {\seveni no} physical states in the particular SU(2) model studied.Comment: 5 pages, Talk at the 1st Mexican School in Gravitation and mathematical physics, Guanajuato, Mexico, December 12-16 199

Gravitational Collapse of a Homogeneous Scalar Field in Deformed Phase Space

We study the gravitational collapse of a homogeneous scalar field, minimally coupled to gravity, in the presence of a particular type of dynamical deformation between the canonical momenta of the scale factor and of the scalar field. In the absence of such a deformation, a class of solutions can be found in the literature [R. Goswami and P. S. Joshi, arXiv:gr-qc/0410144], %\cite{JG04}, whereby a curvature singularity occurs at the collapse end state, which can be either hidden behind a horizon or be visible to external observers. However, when the phase-space is deformed, as implemented herein this paper, we find that the singularity may be either removed or instead, attained faster. More precisely, for negative values of the deformation parameter, we identify the emergence of a negative pressure term, which slows down the collapse so that the singularity is replaced with a bounce. In this respect, the formation of a dynamical horizon can be avoided depending on the suitable choice of the boundary surface of the star. Whereas for positive values, the pressure that originates from the deformation effects assists the collapse toward the singularity formation. In this case, since the collapse speed is unbounded, the condition on the horizon formation is always satisfied and furthermore the dynamical horizon develops earlier than when the phase-space deformations are absent. These results are obtained by means of a thoroughly numerical discussion.Comment: 17 pages, 17 figure

Factor XI Deficiency

A deficiência de factor XI é uma doença hematológica rara na população em geral. Pode manifestar-se apenas como complicação hemorrágica no doente submetido a cirurgia electiva. Os autores descrevem o caso clínico de uma mulher de 59 anos, que apresenta um quadro de hemorragia vaginal abundante 10 dias após ter sido submetida a histerectomia vaginal com McCall, plastia anterior e posterior. Salientam a importância da avaliação analítica pré-operatória, em especial o estudo da coagulação, e descrevem a abordagem e o tratamento da deficiência de factor XI

Loop quantum effect and the fate of tachyon field collapse

We study the fate of gravitational collapse of a tachyon field matter. In presence of an inverse square potential a black hole forms. Loop quantum corrections lead to the avoidance of classical singularities, which is followed by an outward flux of energy.Comment: Contribution to the conference of Loops'11, Madri

Diversidade de artrópodes terrestres em dois tipos de culturas frutícolas na ilha Terceira, Açores: os predadores generalistas e himenópteros parasitóides (Hymenoptera, Parasitica)

I Congresso de Fruticultura e Viticultura. Angra do Heroísmo 17-19 Abril 2008.Trabalho de investigação desenvolvido no projecto INTERFRUTA II, financiado pelo programa INTERREG III-B."[…]. Neste trabalho abordou-se a diversidade de artrópodes terrestres em três pomares pertencentes a dois tipos de culturas frutícolas. Pretendeu-se conhecer a riqueza específica dos predadores generalistas, com relevância na ordem Araneae, assim como a diversidade de himenópteros parasitóides (Hymenoptera, Parasitica) em três pomares de dois tipos de culturas frutícolas, e determinar a presença de possíveis himenópteros parasitóides da mosca-do-mediterrâneo (Ceratitis capitata Wiedemann) (Diptera, Thephritidae) e do bichado-da-castanha (Cydia splendana (Hübner)) (Lepidoptera, Troticidae), dependendo da cultura em estudo.

On the Cosmology of Massive Vector Fields with SO(3) Global Symmetry

A relevant reference ([14]) has been added.Comment: 19 pages, plain tex, DF/IST-3/92 and DFFCUL 03-5/199