Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-10-06
J.Phys.Conf.Ser.259:012083,2010
Physics
High Energy Physics
High Energy Physics - Theory
6 pages, no figures, based on a talk presented at PASCOS 2010
Scientific paper
10.1088/1742-6596/259/1/012083
We study the role of the cosmological constant (CC) as a component of dark energy (DE). It is argued that the cosmological term is in general unavoidable and it should not be ignored even when dynamical DE sources are considered. From the theoretical point of view quantum zero-point energy and phase transitions suggest a CC of large magnitude in contrast to its tiny observed value. Simply relieving this disaccord with a counterterm requires extreme fine-tuning which is referred to as the old CC problem. To avoid it, we discuss some recent approaches for neutralising a large CC dynamically without adding a fine-tuned counterterm. This can be realised by an effective DE component which relaxes the cosmic expansion by counteracting the effect of the large CC. Alternatively, a CC filter is constructed by modifying gravity to make it insensitive to vacuum energy.
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