fossil radiation

Cosmological background anisotropies

by

The cosmic microwave background, often referred to as fossil radiation, is an extraordinary witness of the primordial universe. Originating from the time when the first atoms could form, this radiation reveals the state of the Universe approximately 380,000 years after the Big Bang. However, far from being perfectly uniform, it presents small temperature variations known … Read more

The Sachs-Wolfe effect: cosmological footprints

by

Observations of the cosmos reveal mysteries that are intricately woven into the delicate fabric of the primordial universe. Among these invisible footprints, the Sachs-Wolfe effect holds a prominent place. It traces the memory of gravitational evolution through the anisotropies of the cosmic microwave background, this ancient breath imbuing every photon of the cosmic background radiation. … Read more