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Reference.org
Four-acceleration
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<p>In the <a href="/facts/Theory_of_relativity/qGHj3eTC">theory of relativity</a>, four-acceleration is a <a href="/facts/Four-vector/89GpELMA">four-vector</a> (vector in four-dimensional <a href="/facts/Spacetime/uRIN1x4b">spacetime</a>) that is analogous to classical <a href="/facts/Acceleration/UVDmjYvR">acceleration</a> (a three-dimensional vector, see <a href="/facts/Acceleration_(special_relativity)/7NszcjkY">three-acceleration in special relativity</a>). Four-acceleration has applications in areas such as the annihilation of <a href="/facts/Antiproton/dLqJkhGQ">antiprotons</a>, resonance of <a href="/facts/Strangeness/T1kLPfQU">strange particles</a> and radiation of an accelerated charge. </p>