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Posebna relativnost ili posebna teorija relativnosti je fizikalna teorija koju je Albert Einstein objavio 1905. Ona je zamijenila njutnovsku koncepciju prostora i vremena i inkorporirala elektromagnetizam reprezentiran Maxwellovim jednadžbama. Teorija je nazvana "posebnom" jer predstavlja poseban slučaj Einsteinove teorije relativnosti u kojem se efekti ubrzanja i gravitacije mogu ignorirati. Deset godina kasnije, Einstein je objavio teoriju opće relativnosti koja obuhvaća i gravitaciju.

Posebna relativnost korektna je kada su gravitacijski efekti zanemarivi ili vrlo slabi, u protivnom mora biti zamijenjena općom relativnošću. Kod vrlo malih skala, kao što je Planckova dužina i ispod toga, također je moguće podbacivanje posebne relativnosti zbog efekata kvantne gravitacije. Bez obzira na to, za makroskopske skale i u odsutnosti jakih gravitacijskih polja, posebna relativnost danas je univerzalno prihvaćena od strane zajednice fizičara, a za eksperimentalne rezultate koji joj naizgled proturječe općenito se smatra da su plod neponovljive eksperimentalne greške.

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