Abstract
A general holographic relation between UV and IR cutoff of an effective field theory is proposed. Taking the IR cutoff relevant to the dark energy as the Hubble scale, we find that the cosmological constant is highly suppressed by a numerical factor and the fine tuning problem seems alleviative. We also use different IR cutoffs to study the case in which the universe is composed of matter and dark energy.
Highlights
Why cosmological constant observed today is so much smaller than the Planck scale?This is one of the most important problems in modern physics
The accelerating cosmic expansion first inferred from the observations of distant type Ia supernovae [1][2] has strongly confirmed by some other independent observations, such as the cosmic microwave background radiation (CMBR) [3] and Sloan Digital Sky Survey (SDSS) [4], and the cosmological constant returns back as a simplest candidate to explain the acceleration of the universe in
The cosmological constant naturally arises as an energy density of the vacuum, which is evaluated by the sum of zero-point energies of quantum fields with mass m as follows ρΛ
Summary
Why cosmological constant observed today is so much smaller than the Planck scale?This is one of the most important problems in modern physics. We use three different IR cutoffs to study the evolution and the equation of state of the dark energy.
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