[01] A. M. Boichenko, A. M. Prokhorov General Physics Institute of Russian Academy of Sciences, Moscow, Russia.

Last time cosmological constant (СС) has to be important role in understanding of Universe nature. Explanation of CC appearance described by changing of space dimension is presented. The conditions that determine the dimension of the space, which describes the specific physical interaction, are discussed in various approaches. The dimension of the Universe has not necessarily fixed value. Then it reduces the variation principle framework allow to emphasized the CC as Lagrange's multiplier introduced for search of a conditional extremum of action in this reduction. Cosmological constant is interpreted as the energy density released in the remaining dimensions then space dimension is reduced.

Cosmology, Cosmological Constant, Quintessence, Dark Energy, Space-Time Dimension

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