Yilmaz theory of gravitation

The Yilmaz theory of gravitation is an attempt by Huseyin Yilmaz (1924–2013; Turkish: Hüseyin Yılmaz) and his coworkers to formulate a classical field theory of gravitation which is similar to general relativity in weak-field conditions, but in which event horizons cannot appear.

Yilmaz's work has been criticized on the grounds that:

* his proposed field equation is ill-defined
* event horizons can occur in weak field situations according to the general theory of relativity, in the case of a supermassive black hole
* the theory is consistent only with either a completely empty universe or a negative energy vacuum[1]

It is well known that attempts to quantize general relativity along the same lines which lead from Maxwell's classical field theory of electromagnetism to quantum electrodynamics fail, and that it has proven very difficult to construct a theory of quantum gravity which goes over to general relativity in an appropriate limit. However Yilmaz has claimed that his theory is "compatible with quantum mechanics". He suggests that it might be an alternative to superstring theory.

In his theory, Yilmaz wishes to retain the left hand side of the Einstein field equation (namely the Einstein tensor, which is well-defined for any Lorentzian manifold, independent of general relativity) but to modify the right hand side, the stress–energy tensor, by adding a kind of gravitational contribution. According to Yilmaz's critics, this additional term is not well-defined, and cannot be made well defined.[citation needed]

No astronomers have tested his ideas, although some have tested competitors of general relativity; see Category:Tests of general relativity.

## References

1. ↑ Ibison, M. (2006). "Cosmological test of the Yilmaz theory of gravity". Classical and Quantum Gravity 23 (3): 577–589. doi:10.1088/0264-9381/23/3/001. Bibcode: 2006CQGra..23..577I.

* Yilmaz, H. (1992). "Toward a field theory of gravitation". Nuovo Cimento B 107 (8): 941–960. doi:10.1007/BF02899296. Bibcode: 1992NCimB.107..941Y.
* Misner, C. W. (1999). "Yilmaz Cancels Newton". Nuovo Cimento B 114 (9): 1079–1085. Bibcode: 1999NCimB.114.1079M. In this paper, Charles Misner argues that Yilmaz's field equation is ill-defined.
* Alley, C.O.; Aschan, P. K.; Yilmaz, H. (1995). "Refutation of C. W. Misner's claims in his article "Yilmaz Cancels Newton"". arXiv:gr-qc/9506082.
* Fackerell, E. D. (2006). "Remarks on the Yilmaz and Alley papers". School of Mathematics and Statistics F07, University of Sydney. Archived from the original on 2004-09-20. https://web.archive.org/web/20040920175932/http://www.physics.adelaide.edu.au/ASGRG/ACGRG1/fackerell.html. In this preprint, Edward Fackerell criticizes several claims by Yilmaz concerning gtr
* Alley, C. O.; Yilmaz, H. (2000). "Response to Fackerell's Article". arXiv:gr-qc/0008040.
* Misner, C.; Thorne, K. S.; Wheeler, J. A. (1973). Gravitation. W. H. Freeman. ISBN 0-7167-0344-0. See section 20.4 for nonlocal nature of gravitational field energy, and all of chapter 20 for relation between integration, Bianchi identities, and 'conservation laws' in curved spacetimes.

## External links

* One page in the website Relativity on the World Wide Web (archived link) lists some apparent misstatements by Yilmaz concerning the general theory of relativity, similar to those discussed by Fackerell.

* v
* t
* e

Theories of gravitation

Standard|

| Newtonian gravity (NG)|

* Newton's law of universal gravitation
* Gauss's law for gravity
* Poisson's equation for gravity
* History of gravitational theory

|

General relativity (GR)|

* Introduction
* History
* Mathematics
* Exact solutions
* Resources
* Tests
* Post-Newtonian formalism
* Linearized gravity
* ADM formalism
* Gibbons–Hawking–York boundary term

Alternatives to
general relativity|

| Paradigms|

* Classical theories of gravitation
* Quantum gravity
* Theory of everything

|

Classical|

* Einstein–Cartan
* Bimetric theories
* Gauge theory gravity
* Teleparallelism
* Composite gravity
* f(R) gravity
* Infinite derivative gravity
* Massive gravity
* Modified Newtonian dynamics, MOND
* AQUAL
* Tensor–vector–scalar
* Nonsymmetric gravitation
* Scalar–tensor theories
* Brans–Dicke
* Scalar–tensor–vector
* Conformal gravity
* Scalar theories
* Nordström
* Whitehead
* Geometrodynamics
* Induced gravity
* Chameleon
* Pressuron
* Degenerate Higher-Order Scalar-Tensor theories

Quantum-mechanical|

* Euclidean quantum gravity
* Canonical quantum gravity
* Wheeler–DeWitt equation
* Loop quantum gravity
* Spin foam
* Causal dynamical triangulation
* Asymptotic safety in quantum gravity
* Causal sets
* DGP model
* Rainbow gravity theory

Unified-field-theoric|

* Kaluza–Klein theory
* Dilaton
* Supergravity

Unified-field-theoric and
quantum-mechanical|

* Noncommutative geometry
* Semiclassical gravity
* Superfluid vacuum theory
* Logarithmic BEC vacuum
* String theory
* M-theory
* F-theory
* Heterotic string theory
* Type I string theory
* Type 0 string theory
* Bosonic string theory
* Type II string theory
* Little string theory
* Twistor theory
* Twistor string theory

Generalisations /
extensions of GR|

* Scale relativity
* Liouville gravity
* Lovelock theory
* (2+1)-dimensional topological gravity
* Gauss–Bonnet gravity
* Jackiw–Teitelboim gravity

Pre-Newtonian
theories and
toy models|

* Aristotelian physics
* CGHS model
* RST model
* Mechanical explanations
* Fatio–Le Sage
* Entropic gravity
* Gravitational interaction of antimatter
* Physics in the medieval Islamic world
* Theory of impetus

Related topics|

* Graviton

0.00

(0 votes)

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Physics:Yilmaz_theory_of_gravitation&oldid=407490"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template