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hep-th2026
corrections to self-dual gravitational instantons
José Luis V. Cerdeira, Cristóbal Corral, Tomás Ortín
We study the corrections to self-dual gravitational instantons in the context of the four-dimensional Cano--Ruipérez action, which can be obtained by the compactification of t…
hep-th2025
The Komar charge in presence of the Holst term and the gravitational Witten effect
José Luis V. Cerdeira, Tomás Ortín
In the first-order formalism, the Einstein--Hilbert action can be modified by the addition of a Holst term multiplied by the Barbero parameter . This modification breaks parity…
hep-th2025
On-shell Lagrangians as total derivatives and the generalized Komar charge
José Luis V. Cerdeira, Tomás Ortín
Lagrangians which transform homogeneously under a global transformation of the fields (a global rescaling, for instance) can be written on-shell as a total derivative which has a u…