Cosmo: Wednesday, 07/06/2023, 11:00, Main Lecture Hall
Jiří Podolský (Charles University, Prague)
A new metric form of the whole class of type D black holes
Recently, we have found an improved metric form of the complete family of exact black hole spacetimes of algebraic type D, including any cosmological constant. This class was found by Debever in 1971, Plebanski and Demianski in 1976, and conveniently reformulated by Griffiths and Podolsky in 2005. In our new form of this metric the key functions are simplified, partially factorized, and fully explicit. They depend on seven parameters with direct physical meanings, namely m, a, l, alpha, e, g, Lambda which characterize mass, Kerr-like rotation, NUT parameter, acceleration, electric and magnetic charges of the black hole, and the cosmological constant, respectively. Moreover, this general metric reduces directly to the familiar forms of Kerr-Newman-AdS spacetime, charged Taub-NUT-AdS solution, or rotating and charged AdS C-metric. It also enables us to study various physical and geometrical properties, namely the character of singularities, two black-hole and two cosmo-acceleration horizons (in a generic situation), the related ergoregions, global structure including the Penrose conformal diagrams, parameters of cosmic strings causing the acceleration of the black holes, their rotation, pathological regions with closed timelike curves, or thermodynamic quantities.
Cosmo: Wednesday, 14/06/2023, 11:00, Main Lecture Hall
Mehrdad Mirbabayi (ICTP, Italy)
TBA
Cosmo: Wednesday, 21/06/2023, 11:00, room 117
Dina Traykova, (Potsdam Max Planck Institute, Germany)
TBA