Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The quality or state of being unitary.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From unitary +‎ -ity.

Examples

  • Since unitarity is fundamental to field theory, this result had a certain importance.

    Jack Steinberger - Autobiography

  • Until now, unitarity triangle measurements have been maddeningly consistent with the amount of CP violation predicted by the standard model alone.

    A Non-Technical Explanation of Flavo(u)r Physics « Imaginary Potential

  • So, why should a quantum theory of gravity retain unitarity?

    The Arrow of Time in Scientific American

  • Any such theory that retains unitarity would require, for example, that each of the patches into which a de Sitter region evolves be different in some way from the original patch, such that they individually have fewer degrees of freedom.

    The Arrow of Time in Scientific American

  • Since there are more such regions, it would appear that the total number of degrees of freedom has increased, in violation of unitarity.

    The Arrow of Time in Scientific American

  • When the system S+O is considered from the point of view of O², the measurement can be seen as an interaction whose dynamics is fully unitary, whereas by the point of view of O the measurement breaks the unitarity of the evolution of S.

    Relational Quantum Mechanics

  • And then the problem is that either the entropy is decreasing during that collapse, for no good reason and in contradiction with everything we think we know about gravitational dynamics, or it is increasing during the collapse, yet supposedly gives rise to an extraordinarily low-entropy condition on the other side, for no good reason and in contradiction with everything we think we know about unitarity and thermodynamics.

    Against Bounces

  • What will be tested are general properties of unitarity, analyticity, and lorentz invariance-properties that are not unique to string theory.

    Intelligent Design is Neither - The Panda's Thumb

  • There are many known examples: Lagrangian theory, thermal properties, foundations of quantum formalism, unitarity, all the crackpotism about Landscape and CC, epiroktic scenarios, etc.

    The String Theory Backlash

  • The unitarity theorem would break down, thus signaling Quantum Mechanics needs to be overhauled!

    Most Surprising LHC Discovery?

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