65 citations · 174 across the 8 of their papers we have counts for
10 papers
Zero expansion is not free: the sharp minimum of Eulerian negative energy in Natário warp drives
Nelson Bolívar, Ivaylo Vasilev, Gabriel Abellán
Natário's warp drive replaces the contraction and expansion of the Alcubierre bubble by a divergence-free shift. We determine exactly how much Eulerian negative energy this constru…
Transient Coherence and Multiscale Spectral Structure after a Mass Quench in a 1+1-Dimensional Scalar Field
Gabriel Abellán, Nelson Bolívar
A mass quench generates anomalous pair correlations that are absent from the final particle occupations. For a free real scalar field in dimensions, we define a bilocal obser…
Boundary Obstructions and Lapse Freedom in Static Spherical Hollow Cores
Nelson Bolívar, Gabriel Abellán, Ivaylo Vasilev
We analyze a sharply delimited comparison problem for a static spherical hollow core: an empty, flat cavity surrounded by a positive matter wall. In the unit-lapse, flat-slice radi…
Covariance-Driven Momentum Rectification at Liquid-Vapor Interfaces Near Wetting Transitions
Nelson Bolívar, Gabriel Abellán, Ivaylo Vasilev
Zero-mean forcing can generate directed transport when a medium responds in a spatially structured way and the relevant symmetries are broken. Liquid-vapor interfaces are a useful…
A Generalized Double Chaplygin Model for Anisotropic Matter: The Newtonian Case
Gabriel Abellán, Angel Rincon, Eduard Sanchez
In this work, we investigate astrophysical systems in a Newtonian regime using anisotropic matter. For this purpose, we considered that both radial and tangential pressures satisfy…
Influence of anisotropic matter on the Alcubierre metric and other related metrics: revisiting the problem of negative energy
G. Abellan, N. Bolivar, I. Vasilev
Negative energy scenarios are the most widely studied for the warp metric. In fact, the prevailing view in the community so far has been that the warp metric necessarily has negati…
Uncharged and charged anisotropic like--Durgapal stellar model with vanishing complexity
E. Contreras, E. Fuenmayor, G. Abellán
In this work we use the vanishing complexity factor as a supplementary condition to construct uncharged and charged like--Durgapal models. We provide the component of the…
The general relativistic double polytrope for anisotropic matter
G. Abellan, E. Fuenmayor, E. Contreras +1
A general formalism recently proposed to study Newtonian polytropes for anisotropic fluids is here extended to the relativistic regime. Thus, it is assumed that a polytropic equati…
The double polytrope for anisotropic matter: Newtonian Case
G. Abellan, E. Fuenmayor, L. Herrera
A general formalism developed few years ago to model polytropic Newtonian stars with anisotropic pressure is applied to model stars for which, both, radial and tangential pressure…
On non-coplanar Hohmann Transfer using angles as parameters
Angel Rincon, Patricio Rojo, Elvis Lacruz +2
We study a more complex case of Hohmann orbital transfer of a satellite by considering non-coplanar and elliptical orbits, instead of planar and circular orbits. We use as paramete…