THESIS
2022
1 online resource (xi, 106 pages) : illustrations (some color)
Abstract
The principle of naturalness is a powerful tool for investigating the Universe. This
thesis constructs a nonlinear supergravity model, which is guided by the naturalness of
small cosmological constant. The application of algebraic constraints makes the contributions
from the Higgs sector and the supersymmetry breaking anti-D3-brane to the
cosmological constant exactly cancel. This leaves the cosmological constant to be determined
by the geometric sector. As a result, a naturally vanishing cosmological constant
is obtained statistically, while the electroweak scale emerges naturally from the observed
cosmological constant. The phenomenological extension of this model, which couples the
Higgs field to ultra-light pseudo-scalars, named the axi-Higgs cosmology model, helps in
resolving seve...[
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The principle of naturalness is a powerful tool for investigating the Universe. This
thesis constructs a nonlinear supergravity model, which is guided by the naturalness of
small cosmological constant. The application of algebraic constraints makes the contributions
from the Higgs sector and the supersymmetry breaking anti-D3-brane to the
cosmological constant exactly cancel. This leaves the cosmological constant to be determined
by the geometric sector. As a result, a naturally vanishing cosmological constant
is obtained statistically, while the electroweak scale emerges naturally from the observed
cosmological constant. The phenomenological extension of this model, which couples the
Higgs field to ultra-light pseudo-scalars, named the axi-Higgs cosmology model, helps in
resolving several cosmological puzzles by allowing the cosmic evolution of the Higgs VEV.
The possibility of a temporary de Sitter universe is also explored under the misalignment
mechanism of Kähler modulus.
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