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anisotropy

Overview page. Subjects: Genetics and Genomics.

A directional property of crystals and fibers having a high degree of molecular orientation. Anisotropic substances have different physical properties when tested in different directions....

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big Bang

Overview page. Subjects: Physics — Astronomy and Astrophysics.

The hypothetical but widely accepted ‘explosive’ event that marked the origin of the universe as we know it. At the time of the Big Bang, the entire universe was squeezed into an infinitely...

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bulk motions

Overview page. Subjects: Astronomy and Astrophysics.

As well as moving apart from each other as the Universe expands, galaxies have peculiar velocities relative to this Hubble expansion. If there is a large overdensity in a particular ...

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cosmic structure

Overview page. Subjects: Astronomy and Astrophysics.

Cosmic structure, also known as the large-scale structure of the Universe, describes the way that galaxies and other tracers of mass in the Universe are distributed. Although on the largest...

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cosmological models

Overview page. Subjects: Astronomy and Astrophysics.

A cosmological model is a general term for any mathematical model seeking to capture some of the key observed features of the Universe. A model is normally a collection of ...

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cosmological perturbation theory

Overview page. Subjects: Astronomy and Astrophysics.

Cosmological perturbation theory is the study of the development of irregularities in the distribution of matter in the Universe as it evolves. The term ‘perturbation theory’ indicates that...

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cosmological principle

Overview page. Subjects: Astronomy and Astrophysics.

The claim that on extremely large scales, i.e. much greater scales than those associated with large-scale structure, the universe is homogeneous and isotropic. There is some evidence that...

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de Sitter space

Overview page. Subjects: Astronomy and Astrophysics.

One of the first cosmological models to be created from Albert Einstein's theory of general relativity was de Sitter space, proposed in 1917 by Dutch astronomer Willem de Sitter (not ...

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early universe

Overview page. Subjects: Physics.

The study of cosmology at the time very soon after the big bang. Theories of the early universe have led to a mutually beneficial interaction between cosmology and the theory of elementary...

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galaxy formation

Overview page. Subjects: Astronomy and Astrophysics.

The process or processes which gave rise to the galaxies. In the Big Bang theory, the early Universe was predominantly smooth, so something must have caused material to assemble into...

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