What is another word for cosmological constant?
Pronunciation: [kˌɒzməlˈɒd͡ʒɪkə͡l kˈɒnstənt] (IPA) 
The cosmological constant is a term coined by Einstein to describe the constant energy density that exists throughout the universe. However, there are several other synonymous terms to describe this term. Some of the most commonly used synonyms for cosmological constant include vacuum energy, dark energy, quintessence, and lambda. Vacuum energy refers to the energy that exists in space even in the complete absence of particles. Dark energy is a term used to describe the hypothetical form of energy that contributes to the acceleration of the universe's expansion. Quintessence refers to the hypothetical form of dark energy that varies in time and space. Finally, lambda is another term used to describe the cosmological constant.
