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Robert Herman

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description Robert Herman Overview

Robert Herman was an American physicist and physical chemist best known for his work in cosmology. In the late 1940s, collaborating with Ralph Alpher and George Gamow, he was instrumental in predicting the existence and temperature of the cosmic microwave background radiation. This theoretical groundwork explained the residual heat from the Big Bang, which was observationally confirmed nearly two decades later by Arno Penzias and Robert Wilson. Herman later shifted his focus to transportation science, helping to develop models for urban traffic flow.

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What did Robert Herman and Ralph Alpher predict about the cosmic microwave background?

In the late 1940s, Herman and Ralph Alpher predicted that the hot early universe should leave behind cooled thermal radiation with a temperature of only a few kelvin. That relic is now known as the cosmic microwave background.

How close was Herman's predicted background temperature to the measured value?

Alpher and Herman's estimates were in the range of a few kelvin, remarkably close in scale to the modern value of about 2.7 kelvin. Arno Penzias and Robert Wilson detected the background radiation in 1965.

Why was Robert Herman not included in the Nobel Prize for the cosmic microwave background?

The 1978 Nobel Prize in Physics recognized Penzias and Wilson for discovering cosmic microwave background radiation observationally. Herman and Alpher had predicted the relic radiation much earlier, but Nobel Prizes do not automatically include theorists whose work anticipated a later discovery.

Did Robert Herman work only in cosmology?

No. Herman also became a major figure in traffic-flow theory and worked with Elliott Montroll on mathematical models of vehicle movement. This made his career unusually broad, spanning early-universe physics and transportation science.