We identify a class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compact stars. In particular, these theories formally admit all of the stationary solutions of general relativity, but these are not dynamically preferred if certain conditions are satisfied. Remarkably, black holes exhibit scalarization if their mass lies within one of many narrow bands. We find evidence that scalarization can occur in neutron stars as well.

Spontaneous scalarization of black holes and compact stars from a Gauss-Bonnet coupling

Gualtieri, Leonardo;
2018

Abstract

We identify a class of scalar-tensor theories with coupling between the scalar and the Gauss-Bonnet invariant that exhibit spontaneous scalarization for both black holes and compact stars. In particular, these theories formally admit all of the stationary solutions of general relativity, but these are not dynamically preferred if certain conditions are satisfied. Remarkably, black holes exhibit scalarization if their mass lies within one of many narrow bands. We find evidence that scalarization can occur in neutron stars as well.
Silva, Hector O.; Sakstein, Jeremy; Gualtieri, Leonardo; Sotiriou, Thomas P.; Berti, Emanuele
File in questo prodotto:
File Dimensione Formato  
Spontaneous scalarization.pdf

accesso aperto

Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 333.09 kB
Formato Adobe PDF
333.09 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/1148318
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 264
  • ???jsp.display-item.citation.isi??? 255
social impact