scholarly journals Slowly decaying tails of massive scalar fields in spherically symmetric spacetimes

2002 ◽  
Vol 65 (8) ◽  
Author(s):  
Hiroko Koyama ◽  
Akira Tomimatsu
Keyword(s):  
Scalar Fields ◽  
Spherically Symmetric ◽  
Massive Scalar ◽  
Symmetric Spacetimes ◽  
Spherically Symmetric Spacetimes

scholarly journals Could the black hole singularity be a field singularity?

2020 ◽  
Vol 29 (03) ◽  
pp. 2050026 ◽  
Author(s):  
Guillem Domènech ◽  
Atsushi Naruko ◽  
Misao Sasaki ◽  
Christof Wetterich
Keyword(s):  
Black Hole ◽  
Scalar Fields ◽  
Massless Scalar ◽  
Spherically Symmetric ◽  
Symmetric Spacetimes ◽  
Black Hole Singularity ◽  
Physical Singularity ◽  
Field Singularity ◽  
Spherically Symmetric Spacetimes ◽  
Static Spherically Symmetric Spacetimes

In the wake of interest to find black hole solutions with scalar hair, we investigate the effects of disformal transformations on static spherically symmetric spacetimes with a nontrivial scalar field. In particular, we study solutions that have a singularity in a given frame, while the action is regular. We ask if there exists a different choice of field variables such that the geometry and the fields are regular. We find that in some cases disformal transformations can remove a singularity from the geometry or introduce a new horizon. This is possible since the Weyl tensor is not invariant under a general disformal transformation. There exists a class of metrics which can be brought to Minkowksi geometry by a disformal transformation, which may be called disformally flat metrics. We investigate three concrete examples from massless scalar fields to Horndeski theory for which the singularity can be removed from the geometry. This might indicate that no physical singularity is present. We also propose a disformal invariant tensor.

Classification of Static Spherically Symmetric Spacetimes by Noether Symmetries

2013 ◽  
Vol 52 (10) ◽  
pp. 3534-3542 ◽  
Author(s):  
Ashfaque H. Bokhari ◽  
A. G. Johnpillai ◽  
A. H. Kara ◽  
F. M. Mahomed ◽  
F. D. Zaman
Keyword(s):  
Spherically Symmetric ◽  
Noether Symmetries ◽  
Symmetric Spacetimes ◽  
Spherically Symmetric Spacetimes ◽  
Static Spherically Symmetric Spacetimes
Sign in / Sign up

Export Citation Format

Share Document