scholarly journals Chern-Simons modified general relativity: Conserved charges

2008 ◽  
Vol 77 (2) ◽  
Author(s):  
Bayram Tekin
Keyword(s):  
General Relativity ◽  
Conserved Charges ◽  
Chern Simons

scholarly journals The Quantum Cosmological Constant

Symmetry ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1130 ◽  
Author(s):  
Stephon Alexander ◽  
Joao Magueijo ◽  
Lee Smolin
Keyword(s):  
General Relativity ◽  
Quantum Theory ◽  
Quantum Gravity ◽  
Cosmological Constant ◽  
Uncertainty Relation ◽  
Time Variable ◽  
Transition Functions ◽  
New Interpretation ◽  
Chern Simons

We present an extension of general relativity in which the cosmological constant becomes dynamical and turns out to be conjugate to the Chern–Simons invariant of the Ashtekar connection on a spatial slicing. The latter has been proposed Soo and Smolin as a time variable for quantum gravity: the Chern–Simons time. In the quantum theory, the inverse cosmological constant and Chern–Simons time will then become conjugate operators. The “Kodama state” gets a new interpretation as a family of transition functions. These results imply an uncertainty relation between Λ and Chern–Simons time; the consequences of which will be discussed elsewhere.

scholarly journals Quasilocal conserved charges in the presence of a gravitational Chern-Simons term

2013 ◽  
Vol 88 (12) ◽  
Author(s):  
Wontae Kim ◽  
Shailesh Kulkarni ◽  
Sang-Heon Yi
Keyword(s):  
Conserved Charges ◽  
Chern Simons

scholarly journals Thermal Accretion Disk Spectra Based Tests of General Relativity

Proceedings ◽  
2019 ◽  
Vol 17 (1) ◽  
pp. 14
Author(s):  
Alejandro Cárdenas-Avendaño
Keyword(s):  
General Relativity ◽  
Sampling Technique ◽  
Monte Carlo Sampling ◽  
Kerr Solution ◽  
Slow Rotation ◽  
Tests Of General Relativity ◽  
Spin Parameter ◽  
Chern Simons ◽  
Excellent Source

The continuous X-ray flux of stellar-mass black holes provides an excellent source of data to learn about the astrophysics of accretion disks and about the spacetime itself. The extraction of information, however, depends heavily on our ability to correctly model the astrophysics and the theory of gravity, and the quality of the data. By combining a relativistic ray-tracing and Markov-Chain Monte-Carlo sampling technique, I show that the incorporation of the spin parameter through a slowly-rotating approximation, is not able to break the complex degeneracies of the model and therefore, when introducing modifications beyond general relativity it is very challenging to perform tests of general relativity with this type of observations. As a particular case, I show that it not possible to distinguish the small-coupling, slow-rotation black hole solution of dynamical Chern–Simons gravity from the Kerr solution with current instruments.

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