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Reference.org
Imaginary time
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<p>Imaginary time is a mathematical representation of <a href="/facts/Time/HceJKUGB">time</a> that appears in some approaches to <a href="/facts/Special_relativity/vsFFc63E">special relativity</a> and <a href="/facts/Quantum_mechanics/BRc3Mzgr">quantum mechanics</a>. It finds uses in certain <a href="/facts/Cosmology/yM19zM7Y">cosmological</a> theories. </p><p>Mathematically, imaginary time is real time which has undergone a <a href="/facts/Wick_rotation/HDU59Ag0">Wick rotation</a> so that its coordinates are multiplied by the <a href="/facts/Imaginary_unit/1SCllQlU">imaginary unit</a> <i>i</i>. Imaginary time is <i>not</i> imaginary in the sense that it is unreal or made-up; it is simply expressed in terms of <a href="/facts/Imaginary_number/6Xh9W3hq">imaginary numbers</a>. </p>