New agegraphic dark energy as a rolling tachyon

Understand

Combining the general relativity and the uncertainty relation in quantum mechanics, the energy density of quantum fluctuations of space-time can be viewed as dark energy.

• The so-called agegraphic dark energy model is just based on this viewpoint, in which the age of the universe is introduced as the length measure.
• Recently, the new agegraphic dark energy model was proposed, where the dynamical dark energy is measured by the conformal age of the universe.
• On the other hand, scalar-field dark energy models like tachyon are often regarded as an effective description of some underlying theory of dark energy.