scholarly journals Charged stringlike solutions of low-energy heterotic string theory

1993 ◽  
Vol 47 (6) ◽  
pp. 2528-2535 ◽  
Author(s):  
Daniel Waldram
Keyword(s):  
String Theory ◽  
Low Energy ◽  
Heterotic String ◽  
Heterotic String Theory

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.

scholarly journals Mass and angular momentum of black holes in low-energy heterotic string theory

2016 ◽  
Vol 31 (11) ◽  
pp. 1650060 ◽  
Author(s):  
Jun-Jin Peng
Keyword(s):  
Angular Momentum ◽  
String Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Low Energy ◽  
Heterotic String ◽  
Black String ◽  
Heterotic String Theory ◽  
Conformally Invariant ◽  
Vector Gauge

We investigate conserved charges in the low-energy effective field theory describing heterotic string theory. Starting with a general Lagrangian that consists of a metric, a scalar field, a vector gauge field, together with a two-form potential, we derive off-shell Noether potentials of the Lagrangian and generalize the Abbott–Deser–Tekin (ADT) formalism to the off-shell level by establishing one-to-one correspondence between the ADT potential and the off-shell Noether potential. It is proved that the off-shell generalized ADT formalism is conformally invariant. Then, we apply the formulation to compute mass and angular momentum of the four-dimensional Kerr–Sen black hole and the five-dimensional rotating charged black string in the string frame without a necessity to transform the metrics into the Einstein frame.

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.

ROTATING BONNOR SOLUTION IN DILATON–AXION GRAVITY

1999 ◽  
Vol 14 (23) ◽  
pp. 1599-1608 ◽  
Author(s):  
OLEG V. KECHKIN
Keyword(s):  
Angular Momentum ◽  
String Theory ◽  
Magnetic Dipole ◽  
Dipole Moments ◽  
Low Energy ◽  
Heterotic String ◽  
Heterotic String Theory ◽  
New Class ◽  
Asymptotic Flatness ◽  
Flatness Property

We construct new class of solutions which describes a rotating electric–magnetic dipole in the low energy heterotic string theory. Our method is based on the use of symmetries which preserve asymptotic flatness property; the generation of the solution is performed in the variables which linearize the action of these symmetries. The constructed solution possesses nontrivial values of mass, dilaton and axion charges; the maximal value of angular momentum is defined by some combination of the electric and magnetic dipole moments which is invariant under the action of the electric–magnetic duality.

scholarly journals MATRIX ERNST POTENTIALS AND ORTHOGONAL SYMMETRY OF LOW ENERGY HETEROTIC STRING THEORY REDUCED TO THREE DIMENSIONS

1998 ◽  
Vol 13 (03) ◽  
pp. 393-402 ◽  
Author(s):  
ALFREDO HERRERA-AGUILAR ◽  
OLEG KECHKIN
Keyword(s):  
String Theory ◽  
Symmetry Group ◽  
Low Energy ◽  
Heterotic String ◽  
Three Dimensions ◽  
Energy Limit ◽  
Heterotic String Theory ◽  
Ernst Potentials

A new coset matrix for low-energy limit of heterotic string theory reduced to three dimensions is constructed. The pair of matrix Ernst potentials uniquely connected with the coset matrix is derived. The action of the symmetry group on the Ernst potentials is established.

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