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Related Experiment Video

Updated: Jul 8, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Missing baryons and the warm-hot intergalactic medium.

Fabrizio Nicastro¹, Smita Mathur, Martin Elvis

¹Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA. fnicastro@cfa.harvard.edu

Science (New York, N.Y.)

|January 5, 2008

Summary

Cosmologists are searching for missing baryons, which are thought to be in a warm-hot intergalactic medium. Finding these elusive cosmic ingredients is key to validating our understanding of the universe.

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Area of Science:

Cosmology
Astrophysics
Intergalactic Medium

Background:

The observable universe contains only half of the expected baryonic matter.
The majority of baryons are hypothesized to exist in a warm-hot intergalactic medium (WHIM).
This missing matter is thought to be shock-heated during cosmic structure formation.

Purpose of the Study:

To locate the missing baryons in the universe.
To create a complete inventory of baryonic matter.
To test the standard cosmological model.

Main Methods:

Observational astronomy
Cosmological simulations
Analysis of intergalactic gas properties

Main Results:

The study focuses on the theoretical distribution of missing baryons.
It highlights the expected properties of the warm-hot intergalactic medium.
It emphasizes the need for observational evidence.

Conclusions:

Confirming the existence and distribution of missing baryons is crucial.
This research impacts our validation of the standard cosmological model.
Further observational efforts are required to detect the warm-hot intergalactic medium.