scholarly journals Accelerating black holes in the low energy heterotic string theory

2018 ◽  
Vol 782 ◽  
pp. 594-601 ◽  
Author(s):  
Haryanto M. Siahaan
Keyword(s):  
Black Holes ◽  
String Theory ◽  
Low Energy ◽  
Heterotic String ◽  
Heterotic String Theory

scholarly journals Shadows of charged rotating black holes: Kerr–Newman versus Kerr–Sen

2020 ◽  
Vol 29 (11) ◽  
pp. 2041005
Author(s):  
Sérgio Vinicius Monteiro C. B. Xavier ◽  
Pedro V. P. Cunha ◽  
Luís C. B. Crispino ◽  
Carlos A. R. Herdeiro
Keyword(s):  
Black Holes ◽  
String Theory ◽  
Gravitational Lensing ◽  
New Physics ◽  
Effective Field ◽  
Low Energy ◽  
Heterotic String ◽  
Physical Parameters ◽  
Heterotic String Theory ◽  
Gravitational Fields

Celebrating the centennial of its first experimental test, the theory of General Relativity (GR) has successfully and consistently passed all subsequent tests with flying colors. It is expected, however, that at certain scales new physics, in particular, in the form of quantum corrections, will emerge, changing some of the predictions of GR, which is a classical theory. In this respect, black holes (BHs) are natural configurations to explore the quantum effects on strong gravitational fields. BH solutions in the low-energy effective field theory description of the heterotic string theory, which is one of the leading candidates to describe quantum gravity, have been the focus of many studies in the last three decades. The recent interest in strong gravitational lensing by BHs, in the wake of the Event Horizon Telescope (EHT) observations, suggests comparing the BH lensing in both GR and heterotic string theory, in order to assess the phenomenological differences between these models. In this work, we investigate the differences in the shadows of two charged BH solutions with rotation: one arising in the context of GR, namely the Kerr–Newman (KN) solution, and the other within the context of low-energy heterotic string theory, the Kerr–Sen (KS) solution. We show and interpret, in particular, that the stringy BH always has a larger shadow, for the same physical parameters and observation conditions.

scholarly journals CHARGING INTERACTING ROTATING BLACK HOLES IN HETEROTIC STRING THEORY

2004 ◽  
Vol 19 (30) ◽  
pp. 2299-2315 ◽  
Author(s):  
ALFREDO HERRERA-AGUILAR
Keyword(s):  
Field Theory ◽  
Black Holes ◽  
String Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Low Energy ◽  
Heterotic String ◽  
Target Space ◽  
Heterotic String Theory ◽  
Rotating Black Holes

We present a formulation of the stationary bosonic string sector of the whole toroidally compactified effective field theory of the heterotic string as a double Ernst system which, in the framework of general relativity describes, in particular, a pair of interacting spinning black holes; however, in the framework of low-energy string theory the double Ernst system can in particular be interpreted as the rotating field configuration of two interacting sources of black hole type coupled to dilaton and Kalb–Ramond fields. We clarify the rotating character of the Btφ-component of the antisymmetric tensor field of Kalb–Ramond and discuss on its possible torsion nature. We also recall the fact that the double Ernst system possesses a discrete symmetry which is used to relate physically different string vacua. Therefore we apply the normalized Harrison transformation (a charging symmetry which acts on the target space of the low-energy heterotic string theory preserving the asymptotics of the transformed fields and endowing them with multiple electromagnetic charges) on a generic solution of the double Ernst system and compute the generated field configurations for the 4-D effective field theory of the heterotic string. This transformation generates the U (1)n vector field content of the whole low-energy heterotic string spectrum and gives rise to a pair of interacting rotating black holes endowed with dilaton, Kalb–Ramond and multiple electromagnetic fields where the charge vectors are orthogonal to each other.

THE ANOMALY CONSIDERATION OF O(16) × O(16) HETEROTIC STRING THEORY

1987 ◽  
Vol 02 (07) ◽  
pp. 531-539 ◽  
Author(s):  
YOUNG HUN KWON
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Heterotic String ◽  
Energy Limit ◽  
Heterotic String Theory ◽  
Energy Theory ◽  
Global Anomaly

To a tachyon-free O (16) × O (16) heterotic string theory with anomaly-free properties in the low energy limit, we consider the anomaly of the compactified theory in 8, 6 and 4 dimensions. Furthermore, we investigate the global anomaly of the theory and discuss the compactified manifold which will give a consistent low energy theory.

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