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This thesis focuses on the theoretical foundation of the Standard
Model valid up to the Planck scale, based on the current
experimental facts from the Large Hadron Collider. The thesis
consists of two themes: (1) to open up a new window of the Higgs
inflation scenario, and (2) to explore a new solution to the
naturalness problem in particle physics. In the first area, on the
Higgs inflation scenario, the author successfully improves a large
value problem on a coupling constant relevant to the Higgs mass in
the Standard Model, in which the coupling value of the order of 105
predicted in a conventional scenario is reduced to the order of 10.
This result makes the Higgs inflation more attractive because the
small value of coupling is natural in the context of ultraviolet
completion such as string theory. In the second area, the author
provides a new answer to the naturalness problem, of why the
cosmological constant and the Higgs mass are extremely small
compared with the Planck scale. Based on the baby universe theory
originally proposed by Coleman, the smallness of those quantities
is successfully explained without introducing any additional new
particles relevant at the TeV energy scale.
This thesis focuses on the theoretical foundation of the Standard
Model valid up to the Planck scale, based on the current
experimental facts from the Large Hadron Collider. The thesis
consists of two themes: (1) to open up a new window of the Higgs
inflation scenario, and (2) to explore a new solution to the
naturalness problem in particle physics. In the first area, on the
Higgs inflation scenario, the author successfully improves a large
value problem on a coupling constant relevant to the Higgs mass in
the Standard Model, in which the coupling value of the order of 105
predicted in a conventional scenario is reduced to the order of 10.
This result makes the Higgs inflation more attractive because the
small value of coupling is natural in the context of ultraviolet
completion such as string theory. In the second area, the author
provides a new answer to the naturalness problem, of why the
cosmological constant and the Higgs mass are extremely small
compared with the Planck scale. Based on the baby universe theory
originally proposed by Coleman, the smallness of those quantities
is successfully explained without introducing any additional new
particles relevant at the TeV energy scale.
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