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Nonmodal linear stability of the Schwarzschild black hole
(2014)
A proof is given that the space L of solutions of the linearized vacuum Einstein equation around a Schwarzschild black hole is parametrized by two scalar fields, which are gauge invariant combinations of perturbed algebraic ...
On nonsingular two-step nilpotent Lie algebras
(2014)
A 2-step nilpotent Lie algebra n is called non-singular if ad X : n → [n, n] is onto for any X /∈ [n, n]. We explore non-singular algebras in several directions, including the classification problem (isomorphism invariants), ...
Crossed extensions of the corepresentation category of finite supergroup algebras
(2015)
We present explicit examples of finite tensor categories that are C2-graded extensions of the corepresentation category of certain finite-dimensional non-semisimple Hopf algebras
A multivariate geostatistical approach for landscape classification from remotely sensed image data
(2015)
This paper proposes a methodology to address the classification of images that have been acquired from remote sensors. One common problem in classification is the high dimensionality of multivariate characteristics. The ...
Plasmatic biochemical variables associated with polymorphisms in the endothelin-1 and endothelin-1 receptor a genes in hypertensive patients : pilot study
(2016)
Aims: Endothelin-1 (ET-1) is a potent vasoconstrictive peptide, and its activity is mediated by the type A receptor (EDNRA). This action may play a significant role in the etiology of hypertension. There are different works ...
The cohomology of filiform Lie algebras of maximal rank
(2014)
We describe the structure of the cohomology of the filiform Lie algebras and as a module over their (2-dimensional) torus of derivations. Our approach relies on the fact that both filiform algebras have an ideal of codimension ...
User interface design for responsive web applications
(2015)
The design of web applications that adapt to different kinds of devices is now a necessity. The responsive web design (RWD) is an actual approach to this problem. There exists a large quantity of responsive frameworks (RF) ...
On homogeneous Ricci solitons
(2014)
We study the evolution of homogeneous Ricci solitons under the bracket flow, a dynamical system on the space Hq,n ⊂ Λ2g∗ ⊗ g of all homogeneous spaces of dimension n with a q-dimensional isotropy, which is equivalent to ...
Inequality between size and angular momentum for bodies
(2014-01-31)
A universal inequality that bounds the angular momentum of a body by the square of its size is presented
and heuristic physical arguments are given to support it. We prove a version of this inequality, as
consequence of ...
On the evolution of the momentarily static radiation free data in the Apostolatos - Thorne cylindrical shell model
(2014-02-24)
In this paper we study the evolution of the 'Momentarily Static and Radiation Free' (MSRF) initial data for the Apostolatos–Thorne cylindrical shell model. After briefly reviewing the equations of motion, the definition ...