48 citations · 76 across the 7 of their papers we have counts for
8 papers
Carrollian limit of NS-NS and Heterotic Supergravity
Romina Ballesteros, Eric Lescano, Sergio Patiño-López
We construct the Carrollian limit of NS--NS and heterotic supergravity through an ultra-relativistic expansion of the fields. An appropriate scaling of the dilaton renders the meas…
Kosmann derivative and momentum maps from a duality covariant framework
Romina Ballesteros, Eric Lescano, Jesús A. Rodríguez
A covariant implementation of diffeomorphisms in the presence of local symmetries is a nontrivial aspect of gravitational theories. In Double Field Theory, this is achieved through…
Non-closed scalar charge in four-dimensional Einstein-scalar-Gauss-Bonnet black hole thermodynamics
Romina Ballesteros, Marcela Cárdenas, Eric Lescano
We develop a covariant differential-form framework to define scalar charges for stationary, asymptotically flat black holes in --dimensional Einstein-scalar-Gauss-Bonnet gravity…
Generalized Komar charges and Smarr formulas for black holes and boson stars
Romina Ballesteros, Tomas Ortin
The standard Komar charge is a -form that can be defined in spacetimes admitting a Killing vector and which is closed when the vacuum Einstein equations are satisfied. Its i…
On the existence of thermodynamically stable asymptotically flat black holes
Dumitru Astefanesei, Romina Ballesteros, Paulina Cabrera +2
We use the quasilocal formalism of Brown and York, supplemented with counterterms, to investigate the thermodynamics of asymptotically flat black holes. We consider two families of…
Hairy black holes, scalar charges and extended thermodynamics
Romina Ballesteros, Tomás Ortín
We explore the use of the recently defined scalar charge which satisfies a Gauss law in stationary spacetimes, in the context of theories with a scalar potential. We find new condi…
On scalar charges and black-hole thermodynamics
Romina Ballesteros, Carmen Gómez-Fayrén, Tomás Ortín +1
We revisit the first law of black hole thermodynamics in 4-dimensional theories containing scalar and Abelian vector fields coupled to gravity using Wald's formalism and a new defi…
Scalar charges and the first law of black hole thermodynamics
Dumitru Astefanesei, Romina Ballesteros, David Choque +1
We present a variational formulation of Einstein-Maxwell-dilaton theory in flat spacetime, when the asymptotic value of the scalar field is not fixed. We obtain the boundary terms…