13 papers
Black holes with torsion hair in cubic Holst-type Poincaré gauge gravity: from singular to regular geometries
Sebastian Bahamonde, Jorge Gigante Valcarcel, Matteo Magi
Motivated by the singularity theorems of Poincaré Gauge (PG) theory, we investigate extensions of the Holst quadratic model by introducing cubic order invariants constructed from t…
Regular black holes from dynamical-tension string hedgehogs
Sebastian Bahamonde, Eduardo I. Guendelman
A spherical cloud of radial strings with non-zero constant tension has an energy density proportional to and therefore produces a singular conical geometry rather than an…
Gauge-invariant cosmological perturbations in Type 3 New General Relativity and background-hierarchy bounds
Kyosuke Tomonari, Daniel Blixt, Sebastian Bahamonde
In this paper, we investigate background-hierarchy bounds in Type~3 of New General Relativity (NGR). These bounds arise when the contribution associated with the evolution of the b…
Geometrically Regular Black Holes with Hedgehog Scalar Hair
Sebastian Bahamonde
We study a simple theory based on general relativity, minimally coupled to a constrained scalar triplet and to an auxiliary non-propagating three-form sector. Within a spherically…
Gravitational waves in Cubic Metric-Affine Gravity
Sebastian Bahamonde, Jorge Gigante Valcarcel, José M. M. Senovilla
We derive new exact gravitational wave solutions with dynamical torsion and nonmetricity tensors in the framework of cubic Metric-Affine Gravity (MAG). For this purpose, we conside…
A gravitational spin-orbit interaction in Poincaré gauge theory
Sebastian Bahamonde, Jorge Gigante Valcarcel
We show a gravitational spin-orbit interaction that can potentially modify the space-time geometry naturally emerges in the framework of Poincaré gauge theory. For this purpose, we…