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What is "quantum theory"

Longman Dictionary of Contemporary English
quantum theory
noun
EXAMPLES FROM CORPUS
▪ A divorce is decreed between wave and particle which quantum theory had for ever joined together.
▪ According to quantum theory, elementary particles do not really exist until an intelligent observer measures them.
▪ Here is the unique point at which the fitful indeterminacy of quantum theory makes itself felt.
▪ However, in quantum theory, anything that is not actually forbidden can and will happen.
▪ Might not some essential aspects of quantum theory also be playing crucial roles in the physics that underlies our thought processes?
▪ Similarly, in the quantum theory of gravity, there are many different possible quantum states for the universe.
▪ This is a profound question, and present-day quantum theory does not really provide us with a satisfying answer.
▪ We must face the problems of quantum theory later!
Wiktionary
quantum theory

n. 1 (context physics English) A theory developed in the early 20th century, according to which nuclear and radiation phenomena can be explained by assuming that energy only occurs in discrete amounts called quantum. 2 (context physics English) Modern quantum mechanics.

WordNet
quantum theory

n. (physics) a physical theory that certain properties occur only in discrete amounts (quanta)

Wikipedia
Quantum theory

Quantum theory may mean:

In science:

  • Quantum mechanics: a subset of physics explaining the physical behaviours at the molecular, atomic and sub-atomic levels
  • Old quantum theory under the Bohr model or a theory
  • Quantum field theory, a generic type of relativistic quantum theory, which includes:
    • Quantum electrodynamics
    • Quantum chromodynamics
    • Electroweak interaction
  • Quantum gravity, a general term for theories intended to quantize general relativity
  • Quantum optics
  • Quantum chemistry

In popular culture:

  • "Quantum Theory", a song from the Jarvis Cocker album Jarvis
  • Quantum Theory (video game), a 2010 video game by Tecmo
Quantum Theory (video game)

Quantum Theory, (known in Japan as ) is a third-person shooter video game for the PlayStation 3 and Xbox 360. It is developed by Team Tachyon and published by Tecmo. The game was released in September 2010.

The game centers on two characters named Syd and Filena who must fight through a "living tower". The game features a cover system that constantly adds and removes cover.