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Line 17: − + − − In dealing with gravity, QFT has a well-known (in theoretical physics circles) "cosmological constant problem."<ref> +
Put sentence where it belongs.
Field theoretical calculations become increasingly difficult as the number of (incoming or outgoing) particles increases; for very large numbers of particles (e.g. macroscopic liquids and solids), the methods of [[Solid State Physics]] (also based on QM) are employed instead.
Field theoretical calculations become increasingly difficult as the number of (incoming or outgoing) particles increases; for very large numbers of particles (e.g. macroscopic liquids and solids), the methods of [[Solid State Physics]] (also based on QM) are employed instead.
The most naive application of Quantum Field Theory to any theory of gravity is known to be unworkable. This is in contrast to the other three forces of nature (electromagnetic, weak nuclear, strong nuclear), which have extensive and impressive experimental confirmation<ref>Chris Quigg. <i>Gauge Theories of the Strong, Weak, and Electromagnetic Interactions</i>; Benjamin/Cummings Co. (1983).</ref>. No alternative formulations of quantum gravity have experimental confirmation. While [[Special Relativity]] is an intrinsic part of quantum field theory, the prevailing theory of gravity (the curvature of spacetime under [[General Relativity]]) has not been reconciled. Integrating this fourth force of nature into quantum field theory is an extremely active area of theoretical research. Current research in the field involves such things as [[supersymmetry]] and [[string theory]]
The most naive application of Quantum Field Theory to any theory of gravity is known to be unworkable. It has a well-known (in theoretical physics circles) "cosmological constant problem."<ref>
*[http://arxiv.org/ftp/arxiv/papers/0711/0711.0220.pdf The Vacuum and the Cosmological Constant Problem]
*[http://arxiv.org/ftp/arxiv/papers/0711/0711.0220.pdf The Vacuum and the Cosmological Constant Problem]
*[http://www.math.columbia.edu/~woit/wordpress/?p=5327 Scrutinizing the Cosmological Constant Problem]
*[http://www.math.columbia.edu/~woit/wordpress/?p=5327 Scrutinizing the Cosmological Constant Problem]
*[http://arxiv.org/abs/1211.4848 Scrutinizing the Cosmological Constant Problem and a possible resolution]</ref>
*[http://arxiv.org/abs/1211.4848 Scrutinizing the Cosmological Constant Problem and a possible resolution]</ref>
This is in contrast to the other three forces of nature (electromagnetic, weak nuclear, strong nuclear), which have extensive and impressive experimental confirmation<ref>Chris Quigg. <i>Gauge Theories of the Strong, Weak, and Electromagnetic Interactions</i>; Benjamin/Cummings Co. (1983).</ref>. No alternative formulations of quantum gravity have experimental confirmation. While [[Special Relativity]] is an intrinsic part of quantum field theory, the prevailing theory of gravity (the curvature of spacetime under [[General Relativity]]) has not been reconciled. Integrating this fourth force of nature into quantum field theory is an extremely active area of theoretical research. Current research in the field involves such things as [[supersymmetry]] and [[string theory]]
== The Forces of Nature ==
== The Forces of Nature ==