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An Analytical Two Incompressible Fluid Star with a Mixed Ordinary Dark Matter Core and an Ordinary Matter Envelope
Milko Estrada, Santiago Esteban Perez Bergliaffa
We construct an analytical relativistic two fluid star characterized by a mixed core, where ordinary matter and dark matter coexist as two independently conserved incompressible pe…
A Buchdahl solution generator for Einstein-sigma gravity and multiscalar-tensor gravity
David S. Pereira, Francisco S. N. Lobo, José Pedro Mimoso
Buchdahl transformations provide a geometric route from vacuum spacetimes to scalar-field solutions. We formulate this mechanism as a target-covariant solution generator for Einste…
Spin-Inversion Degeneracies in Restricted Inspiral Waveforms for LISA
Kata Karácsonyi, László Árpád Gergely
Spin inversions appear in several settings. Analytical work predicts a single spin flip during unequal-mass supermassive binary inspiral, while numerical relativity and post-Newton…
Effective Field Theory for Freezing Gravity with Minimally Coupled Matter
Zhibang Yao
Freezing gravity (FG), a phantom-crossing dark energy model, was recently proposed in the absence of matter. In this work, we study FG minimally coupled to a perfect fluid through…
Analyzing Quasi-normal modes spectrum in asymptotically de Sitter black bounces and their optical appearance
G. Alencar, Albert Duran-Cabacés, A. Lima +2
This work explores asymptotically de Sitter black-bounce spacetimes, obtained as a regular extension of the Schwarzschild-de Sitter geometry via the Simpson-Visser prescription. Th…
Dynamics of Charged Radiating Collapse with Shear and Anisotropy
A. Khalid, Muhammad Bilal Riaz, S. A. Mardan +1
We investigate a charged anisotropic radiating stellar configuration undergoing gravitational collapse in the presence of shear and heat flux within the Einstein Maxwell framework.…