Papers by Gretel Quintero Angulo
WOMEN IN PHYSICS: 7th IUPAP International Conference on Women in Physics
Astronomische Nachrichten
DOAJ (DOAJ: Directory of Open Access Journals), Sep 1, 2022
Astronomische Nachrichten
We study the role of temperature and magnetic field on the equation of state and macroscopic prop... more We study the role of temperature and magnetic field on the equation of state and macroscopic properties of Bose-Einstein condensate stars. These compact objects are composed of a condensed gas of interacting neutral vector bosons coupled to a uniform and constant magnetic field. We found that the main consequence of a finite temperature in the magnetized equations of state is to increase the inner pressure of the star. As a consequence, magnetized hot Bose-Einstein condensate stars are larger and heavier than their zero-temperature counterparts. However, the maximum masses obtained by the model remain almost unchanged, and the magnetic deformation of the star increases with the temperature. Besides, augmenting the temperature reduces the number of stable stars, an effect that the magnetic field enhances. The implications of our results for the star's evolution, compactness, redshift, and mass quadupolar moment are also analyzed.
Journal of Statistical Mechanics: Theory and Experiment, 2013
We study the role played by the dilution in the average behavior of a perceptron model with conti... more We study the role played by the dilution in the average behavior of a perceptron model with continuous coupling with the replica method. We analyze the stability of the replica symmetric solution as a function of the dilution field for the generalization and memorization problems. Thanks to a Gardner like stability analysis we show that at any fixed ratio α between the number of patterns M and the dimension N of the perceptron (α = M/N), there exists a critical dilution field h c above which the replica symmetric ansatz becomes unstable.
International Journal of Modern Physics: Conference Series, 2017
We study the equation of motion of neutral vector bosons bearing a magnetic moment (MM). The effe... more We study the equation of motion of neutral vector bosons bearing a magnetic moment (MM). The effective rest mass of vector bosons is a decreasing function of the magnetic field intensity. Consequently a diffuse condensation of the bosons appears below a critical value of the field. For typical values of densities and magnetic fields the magnetization is positive and the neutral boson system can maintain a magnetic field self-consistently. A discussion of the relevance in astrophysics is presented.
In this paper we analyze the impact of the boundary conditions on the solutions of the γ-structur... more In this paper we analyze the impact of the boundary conditions on the solutions of the γ-structure equations for magnetized Bose-Einstein condensate stars (BECs). We consider two cases: a pure BECs and a BECs embedded in a magnetic field. Since they correspond to different physical situations, they lead to different numerical behavior, having important effects on the stability of the solutions as well as on the observables of the star. The differences between the mass-radii curves obtained in each situation are presented and discussed.
In this thesis, the effects of the magnetic field on neutron stars matter are studied, assuming t... more In this thesis, the effects of the magnetic field on neutron stars matter are studied, assuming that the neutrons inside these stars are partially or totally paired forming neutral vector bosons. The main effects of the magnetic field on the gas are, first, to favor the phase transition to the Bose-Eintein condensation, and second, to split the pressure in two components, one parallel and the other perpendicular to the magnetic axis, giving rise to anisotropic equations of state. At low densities or high magnetic fields, the lowest pressure can be negative, and the boson system becomes susceptible to suffer a transverse magnetic collapse. On the other hand, when the temperature is low enough, the gas can spontaneously magnetize. The equations of state of the magnetized gas of neutral vector bosons are applied, firstly, to study the magnetic collpase of an ideal gas of neutrons, electrons and protons (npe gas) in which the nucleons are partially bosonized. From the results obtained, ...
In this thesis, the effects of the magnetic field on neutron stars matter are studied, assuming t... more In this thesis, the effects of the magnetic field on neutron stars matter are studied, assuming that the neutrons inside these stars are partially or totally paired forming neutral vector bosons. The main effects of the magnetic field on the gas are, first, to favor the phase transition to the Bose-Eintein condensation, and second, to split the pressure in two components, one parallel and the other perpendicular to the magnetic axis, giving rise to anisotropic equations of state. At low densities or high magnetic fields, the lowest pressure can be negative, and the boson system becomes susceptible to suffer a transverse magnetic collapse. On the other hand, when the temperature is low enough, the gas can spontaneously magnetize. The equations of state of the magnetized gas of neutral vector bosons are applied, firstly, to study the magnetic collpase of an ideal gas of neutrons, electrons and protons (npe gas) in which the nucleons are partially bosonized. From the results obtained, ...
Physical Review C, 2021
We study stable spheroidal configurations of magnetized strange stars using an axially symmetric ... more We study stable spheroidal configurations of magnetized strange stars using an axially symmetric metric in spherical coordinates that uses a gamma parameter to link the anisotropy in the equation of state due to the magnetic field with the deformation of the star. The stars are composed by magnetized strange quark matter described within the framework of the MIT bag model. Their masses, radii, eccentricity, redshift and mass quadrupole moment are computed. Results are compared with spherical strange star solutions obtained with Tolman-Oppenheimer-Volkoff equations and observational data of strange star candidates. In the spheroidal model the observables depend directly on the deformation of the star, and, even though it is small, the observables strongly deviate from the corresponding spherical configurations. Thus, the highest values of the mass quadrupole moment correspond to the intermediate mass regime. These differences might allow us to discriminate between models with and wit...
Astronomische Nachrichten
Astronomische Nachrichten
Astronomische Nachrichten
Astronomische Nachrichten
Compact objects have an intrinsic anisotropy due to the presence of strong magnetic fields that c... more Compact objects have an intrinsic anisotropy due to the presence of strong magnetic fields that cause considerable modifications on the equations of state (EoS). In this work, we study the impact of this anisotropy in the size and shape of magnetized strange quark stars using an axially symmetric metric in spherical coordinates, the gamma-metric. The results are compared with those obtained with the standard Tolman-Oppenheimer-Volkoff (TOV) equations for the parallel and perpendicular pressures independently. Differences in the results are discussed.
Astronomische Nachrichten
In this paper we analyze the impact of the boundary conditions on the solutions of the γ-structur... more In this paper we analyze the impact of the boundary conditions on the solutions of the γ-structure equations for magnetized Bose-Einstein condensate stars (BECs). We consider two cases: a pure BECs and a BECs embedded in a magnetic field. Since they correspond to different physical situations, they lead to different numerical behavior, having important effects on the stability of the solutions as well as on the observables of the star. The differences between the mass-radii curves obtained in each situation are presented and discussed.
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Papers by Gretel Quintero Angulo