Izbrane teme sodobne fizike in matematike

Kozmološki učinki na razdaljo kotne velikosti v modelu ravnega vesolja

Zaradi širjenja vesolja se razdalja med zelo oddaljenimi nebesnimi telesi s časom povečuje, zato je treba pri merjenju razdalj na velikih skalah upoštevati kozmološke učinke. Slednji vplivajo tudi na navidezno kotno velikost nebesnih teles, ki se z razdaljo in rdečim premikom za zelo oddaljena telesa nepričakovano spreminja. V članku je predstavljena izpeljava zveze med razdaljo kotne velikosti in rdečim premikom v posebnih modelih ravnega vesolja.

Cosmological effects on the angular diameter distance in a flat cosmological model

Due to the expansion of the universe, the distance between very distant celestial objects increases over time, and cosmological effects therefore need to be taken into account when measuring distances on large scales. These effects also influence the apparent angular size of celestial objects, which, for objects at high redshift, varies with distance and redshift in a non-intuitive manner. This article presents the derivation of the relation between angular diameter distance and redshift within specific models of a flat universe.

avtor: Vid Kavčič
številka: 2
letnik: 12

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