Abstract
KKLT scenario has succeeded in stabilizing the volume modulus and constructing metastable de Sitter (dS) vacua in type IIB string theory. We revisit to investigate the possibility of the oscillon (or I-ball) formation in the KKLT scenario when the volume modulus is initially displaced from the dS minimum. Special attention is paid to physically realistic initial conditions of the volume modulus, which was not taken in the literature. Using lattice simulations, we find that oscillons do not form unless the volume modulus is initially placed at very near the local maximum, which requires severe fine-tuning.
Highlights
String theory, in general, contains numerous scalar fields, including the so-called moduli fields which determine the shape and size of extra dimensions
We revisit to investigate the possibility of the oscillon formation in the KKLT scenario when the volume modulus is initially displaced from the de Sitter (dS) minimum
Special attention is paid to physically realistic initial conditions of the volume modulus, which was not taken in the literature
Summary
In general, contains numerous scalar fields, including the so-called moduli fields which determine the shape and size of extra dimensions. A possible solution to this problem was first proposed in [1], known as the Kachru-KalloshLinde-Trivedi (KKLT) scenario, eventually followed by the solution such as the large volume scenario [2] These scenarios succeeded in stabilizing the volume moduli in type IIB string theory, and in enabling to construct metastable de Sitter (dS) vacua, opening the doors to explain observational cosmology by string theory. They can have a large impact on the cosmological evolution of the Universe: they could dominate the energy density of the Universe and delay thermalization [19] It could be a source of characteristic gravitational waves [20,21], which may give some indications for string theories.
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