8 papers
From Holst to Carroll Gravity, a Hamiltonian point of view
J. Fernando Barbero G, Juan Margalef-Bentabol, Valle Varo +1
The Carrollian regime of gravity provides a useful ultrarelativistic framework for studying asymptotically flat spacetimes, horizon dynamics, and condensed matter systems. In this…
Husain-KuchaÅ model as the Carrollian limit of the Holst term
J. Fernando Barbero G., Juan Margalef-Bentabol, Aitor Vicente-Cano +1
We show how the Husain-KuchaÅ model can be understood as a Carrollian limit of the Holst term in the context of background-independent field theories described in terms of coframe…
xCPS: an xAct package for covariant phase space, Noether charges, and entropy
Juan Margalef-Bentabol
xCPS is an xAct tensor algebra package for symbolic computations within the covariant phase space formalism of field theories. From a generic Lagrangian, xCPS automates the derivat…
Hidden diffeos in the Hamiltonian formulation of a background independent field theory
J. Fernando Barbero G., Bogar DÃaz, Juan Margalef-Bentabol +1
We analyze from a geometric perspective the Hamiltonian formulation of a recent modification of the Husain-KuchaÅ model where, while preserving the connection as a dynamical varia…
Dynamical time and Ashtekar variables for the Husain-KuchaÅ model
J. Fernando Barbero G., Juan Margalef-Bentabol, Aitor Vicente-Cano +1
The relation between the Husain-KuchaÅ model and some extensions thereof that incorporate a dynamical time variable is explored. To this end, we rely on the geometric approach to…
The Penrose inequality in spherical symmetry with charge and in Gauss-Bonnet gravity
Hari K. Kunduri, Juan Margalef-Bentabol, Sarah Muth
We establish the spacetime Penrose inequality in spherical symmetry in spacetime dimensions with charge and cosmological constant from the initial data perspective. We a…