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21 papers · 2 filters
The Cauchy problem in hybrid metric-Palatini f(X)-gravity
Salvatore Capozziello, Tiberiu Harko, Francisco S. N. Lobo +2
The well-formulation and the well-posedness of the Cauchy problem is discussed for {\it hybrid metric-Palatini gravity}, a recently proposed modified gravitational theory consistin…
High-Order Fully General-Relativistic Hydrodynamics: new Approaches and Tests
David Radice, Luciano Rezzolla, Filippo Galeazzi
We present a new approach for achieving high-order convergence in fully general-relativistic hydrodynamic simulations. The approach is implemented in WhiskyTHC, a new code that mak…
Adiabatic regularization and particle creation for spin one-half fields
Aitor Landete, Jose Navarro-Salas, Francisco Torrenti
The extension of the adiabatic regularization method to spin- fields requires a self-consistent adiabatic expansion of the field modes. We provide here the details of such exp…
Analytic solution of the algebraic equation associated to the Ricci tensor in extended Palatini gravity
Ginés R. Pérez Teruel
In this work we discuss the exact solution to the algebraic equation associated to the Ricci tensor in the quadratic extension of Palatini gravity. We show that an exact s…
Type D vacuum solutions: a new intrinsic approach
Joan Josep Ferrando, Juan Antonio Sáez
We present a new approach to the intrinsic properties of the type D vacuum solutions based on the invariant symmetries that these spacetimes admit. By using tensorial formalism and…
Galactic rotation curves in hybrid metric-Palatini gravity
Salvatore Capozziello, Tiberiu Harko, Tomi S. Koivisto +2
Generally, the dynamics of test particles around galaxies, as well as the corresponding mass deficit, is explained by postulating the existence of a hypothetical dark matter. In fa…