Cosmic birefringence: the signal that could upend cosmology
One of the most enduring principles in the entire Universe is the cosmological principle: an outgrowth of the Copernican revolution. Copernicus, nearly 500 years ago now, hypothesized that the Earth occupied no special place in the Universe when he put forth the heliocentric picture, instead recognizing that Earth might be just an ordinary planet like all the others: revolving around the Sun.…
One of the most fundamental principles in the cosmos is the cosmological principle, which asserts that our location in space and time holds no special significance in the vast, expanding Universe we inhabit. However, certain signals from the Universe itself could potentially challenge this long-held belief. These signals could manifest as a uniform flow through the Universe, an overall directional field causing particles to accelerate, a preferred direction in the sky, an overall rotation of the Universe, or an overall net polarization in the cosmic microwave background (CMB) radiation, which is the residual light from the Big Bang.
Recent studies of the CMB have revealed a small but positive effect of cosmic birefringence, a phenomenon that could have significant implications for our understanding of the Universe.
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