Review article by Sean Carroll (Caltech) on one of the most important open cosmological questions: the physics behind the acceleration of cosmic expansion. Requires undergraduate physics knowledge. Published in the electronic review journal, Living Reviews in Relativity

Brief overview of the role of the cosmological constant in modern cosmology, using mathematics at an undergraduate level (and, rarely, beyond). Includes a list of technical articles and links. By Eli Michael (University of Colorado at Boulder).

Project aiming to understand why the universe is accelerating and not being slowed by the mass it contains.

A review of the basic idea of the cosmological constant, and of proposals to replace it by a time-varying field. By Michael Doran and Christof Wetterich.

Homepage of a research project based at Lawrence Berkeley National Laboratory, dedicated to using observations of supernova explosions to measure the distance of far-away galaxies; this, in turn allows one to map the properties of cosmic expansion.

... the energy density due to the cosmological constant and the critical density ... News story: More evidence for dark energy being the cosmological constant ...

The cosmological constant is an example of this type of energy. ... The Cosmological Constant and Other Fudge Factors in the Physics of the Universe" ...

The cosmological constant and dark energy" (subscription required) ... of the Cosmological Constant by Unifying Matter and Dark Energy" A geometric ...

... is intended for students age 14 and up, and for anyone interested in learning ... Some astronomers identify dark energy with Einstein's Cosmological Constant. ...

... study confirms the validity of the hot Big Bang model and indicates that there must be an extreme fine tuning of the ... to as "dark energy" or the " ...

The cosmological constant and dark energy" (subscription required) ... of the Cosmological Constant by Unifying Matter and Dark Energy" A geometric ...

Dark energy, which forms almost three-quarters of the universe, is the most ... And dark energy isn't really Einstein's "Cosmological Constant. ...

... refer to one theory of dark energy as Einstein's cosmological constant. ... theory says that dark energy has been steady and constant throughout time and ...

The vacuum energy density must be constant because there is nothing for it to depend on. ... to refer to the cosmological constant as his greatest blunder, and ...

The cosmological constant is the simplest realization of dark energy, which is ... 4.3 Dark energy or cosmological constant. 5 References. 6 Further reading. 7 ...