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pro vyhledávání: '"Teixeira, A F F"'
Autor:
Paiva, F. M., Teixeira, A. F. F.
La transformoj de Schwarz-Christoffel mapas, konforme, la superan kompleksan duon-ebenon al regiono limigita per rektaj segmentoj. Cxi tie ni priskribas kiel konvene kunigi mapon de la suba duon-ebeno al mapo de la supera duon-ebeno. Ni emfazas la be
Externí odkaz:
http://arxiv.org/abs/1705.04581
Akademický článek
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Publikováno v:
Eur.Phys.J. C 78 (2018) 567
[Abridged] If gravitation is to be described by a hybrid metric-Palatini $f(\mathcal{R})$ gravity theory there are a number of issues that ought to be examined in its context, including the question as to whether its equations allow homogeneous G\"od
Externí odkaz:
http://arxiv.org/abs/1611.03985
Publikováno v:
Eur. Phys. J. C 75 (2015) 13
The $f(R)$ gravity theories provide an alternative way to explain the current cosmic acceleration without invoking dark energy matter component. However, the freedom in the choice of the functional forms of $f(R)$ gives rise to the problem of how to
Externí odkaz:
http://arxiv.org/abs/1405.0768
Publikováno v:
Int. J. Mod. Phys.: Conf. Series, v.3, N1, 2011
A detection or nondetection of primordial non-Gaussianity by using the cosmic microwave background radiation (CMB) offers a way of discriminating inflationary scenarios and testing alternative models of the early universe. This has motivated the cons
Externí odkaz:
http://arxiv.org/abs/1202.2933
Autor:
Paiva, F. M., Teixeira, A. F. F.
In the special relativity, a rigid rod slides upon itself, with one extremity oscillating harmonically. We discovered restrictions in the amplitude of the motion and in the length of the rod, essential to eliminate unphysical solutions. ------- Cxe l
Externí odkaz:
http://arxiv.org/abs/1201.0670
Autor:
Paiva, F. M., Teixeira, A. F. F.
In a $n$-dimensional Lie algebra, random numerical values are assigned by computer to $n(n-1)$ especially selected structure constants. An algorithm is then created, which calculates without ambiguity the remaining constants, obeying the Jacobi condi
Externí odkaz:
http://arxiv.org/abs/1108.4396
Autor:
Paiva, F. M., Teixeira, A. F. F.
The theory of relativity showed that several Newtonian ideas about spacetime are imperfect. We present here some relativistic concepts related to these ideas: simultaneity of events and synchronization of clocks (both along a line in the space frame)
Externí odkaz:
http://arxiv.org/abs/1107.1399
Autor:
Paiva, F. M., Teixeira, A. F. F.
In the homogeneous metric of Som-Raychaudhuri, in general relativity, we study the three types of geodesics: timelike, null, and spacelike; in particular, the little known geodesics of simultaneities. We also study the non-geodetic circular motion wi
Externí odkaz:
http://arxiv.org/abs/1104.2273
Autor:
Paiva, F. M., Teixeira, A. F. F.
Geodesic of simultaneity is a spacelike geodesic in which every pair of neighbour events are simultaneous ($g_{0\mu}\dd x^\mu=0$). These geodesics are studied in the exterior region of \Sch's metric.
Comment: 7 pages including 4 figures, Portugu
Comment: 7 pages including 4 figures, Portugu
Externí odkaz:
http://arxiv.org/abs/1006.4654