Browsing by Author "Estrada, Milko"

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    A new model of regular black hole in (2 + 1) dimensions
    (2021-06-28) Estrada, Milko; Tello Ortiz, Francisco
    We provide a new regular black hole solution in (2 + 1) dimensions with the presence of matter fields in the energy momentum tensor. The inclusion of our proposed energy density plus a negative cosmological constant allows that the solution can have both flat as de Sitter or Anti-de Sitter core. This latter is a proper characteristic of our solution, because other models of regular black holes have only a single type of core. Since the first law of thermodynamics for regular black holes is modified by the presence of the matter fields, we provide a new version of the first law, where a local definition of the variation of energy is defined, and where the entropy and temperature are consistent with the ones previously known in the literature. At the hypothetical limit when the horizon radius r+ → ∞ the usual first law dM = TdS is recovered. The effectiveness of the formalism used to compute the mass of our regular black holes in (2 + 1) dimensions suggests the potential applicability of this method to calculate the mass of other models of regular black holes in d ≥ 4 dimensions.
  • Thumbnail Image
    Item
    Gravitational Decoupling algorithm modifies the value of the conserved charges and thermodynamics properties in Lovelock Unique Vacuum theory
    (2022-02-04) Estrada, Milko
    We provide an extension of the Gravitational Decoupling (algorithm) for the Lovelock theory with Unique Vacuum (LUV), which represents a simple way to solve the equations of motion. Due to the application of this algorithm, the energy of the system splits in the energy of the seed solution and the energy of each quasi-LUV sector. Under certain assumptions imposed, the total energy varies due to the contribution of energy of each quasi-LUV sector. It is provided a new solution, whose energy differs from the energy of the seed solution in a quantity that depends on the number of extra sources. The new solution has two inner horizons, which is a proper characteristic of itself. Furthermore, its thermodynamics differs from the seed solution, since our solution is always stable and does not have phase transitions. Since the first law of thermodynamics is modified by the presence of the matter fields, we provide a new version of the first law for LUV, where a local definition of the variation of energy is defined, and, where the entropy and temperature are consistent for LUV theory.