Large-scale structure in a universe with mixed hot and cold dark matter

Article Abstract:

A cosmological dark matter model has been proposed in which 70% of such matter is cold dark matter (CDM) and 30% is hot dark matter (HDM). This model succeeds in consistently explaining both the form of the fluctuation spectrum and the large and small scale variations in estimates of the cosmic density. For these reasons the combined dark matter model appears to be preferable to the purely CDM model.

Models, Dark matter (Astronomy)

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The structure of matter

Article Abstract:

Issues are discussed concerning the divisions which exist between social scientists and natural scientists. The benefits of a greater degree of communication between scientists is considered.

Column, Study and teaching, Information science

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Half-matter, half-light amplifier

Article Abstract:

Research into the amplification of matter waves in semiconductors is discussed. The composite particle amplified in this research is known as an exciton-polariton.

Optical properties, Semiconductors

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