4 papers
The Two-Parameter Brane Sigma-Model and Extended Solutions of M-Theory
Paul P. Cook, Sarben Sarkar
We investigate two-parameter solutions of sigma-models on two dimensional symmetric spaces contained in E11. The sigma-models considered here are not proposed as fundamental two-di…
Squeezed gravitons from superradiant axion fields around rotating black holes
Panagiotis Dorlis, Nick E. Mavromatos, Sarben Sarkar +1
We propose, in (3+1)-dimensional spacetimes, a novel astrophysical source of squeezed graviton states, due to superradiant axionic clouds surrounding rotating (Kerr-type) black hol…
Axions, Black Holes and the Detection of Gravitons: from Astrophysics to Cosmology
Nick E. Mavromatos, Panagiotis Dorlis, Sarben Sarkar +1
We review a novel scenario for the emergence of spin-polarisation entangled squeezed graviton states from superradiant axionic clouds in the neighborhood of astrophysical rotating…
Superradiant Axionic Black-Hole Clouds as Seeds for Graviton Squeezing
Panagiotis Dorlis, Nick E. Mavromatos, Sarben Sarkar +1
It is shown that both, standard general relativity (GR) and Chern-Simons (CS) gravity, the latter containing chiral gravitational anomaly terms, seed the production of pairs of ent…