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Existing ref was a redlink; found 3 others; none mentions the factor-of-120 problem.
'''Quantum field theory''' is a mathematical theory in physics which extends [[quantum mechanics]]. Field theory describes the interactions between subatomic particles, such as electrons, protons, quarks and photons. However, it predicts a cosmological constant that is 120 times larger than the observed value.<ref>http://www.aip.org/pnu/2006/split/781-2.html</ref>
'''Quantum field theory''' is a mathematical theory in physics which extends [[quantum mechanics]]. Field theory describes the interactions between subatomic particles, such as electrons, protons, quarks and photons. However, 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://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>
The differences between basic QM and Field Theory are these: in QM, the interactions between more than two particles are increasingly difficult to model, and the creation and destruction of particles cannot be modeled at all. In contrast, Field Theory can describe states containing arbitrary numbers of particles of different energies, masses, charges and types. Field Theory also provides an elegant framework for describing the interactions between particles, and the creation of new particles and destruction of old ones-- for example, the emission and absorption of photons by electrons, and vice versa.<ref>Bjorken and Drell. <i>Quantum Field Theory</i> Chapter 3; McGraw Hill Inc. (1980)</ref>
The differences between basic QM and Field Theory are these: in QM, the interactions between more than two particles are increasingly difficult to model, and the creation and destruction of particles cannot be modeled at all. In contrast, Field Theory can describe states containing arbitrary numbers of particles of different energies, masses, charges and types. Field Theory also provides an elegant framework for describing the interactions between particles, and the creation of new particles and destruction of old ones-- for example, the emission and absorption of photons by electrons, and vice versa.<ref>Bjorken and Drell. <i>Quantum Field Theory</i> Chapter 3; McGraw Hill Inc. (1980)</ref>