High Quality Content by WIKIPEDIA articles! Vacuum energy is an underlying background energy that exists in space even when devoid of matter (known as free space). The vacuum energy is deduced from the concept of virtual particles, which are themselves derived from the energy-time uncertainty principle. Its effects can be observed in various phenomena (such as spontaneous emission, the Casimir effect, the van der Waals bonds, or the Lamb shift), and it is thought to have consequences for the behavior of the Universe on cosmological scales. The energy of a cubic centimeter of empty space has been calculated to be one trillionth of an erg [1], based on the upper limit of the cosmological constant.

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