New class of N=1 no-scale supergravity models

Area of Science:

• Theoretical Physics
• High Energy Physics
• String Theory

Background:

• Supergravity theories are essential for unifying gravity with quantum field theory.
• No-scale supergravity models offer a framework for addressing the hierarchy problem and dark matter.
• Understanding symmetry breaking mechanisms is crucial for constructing realistic particle physics models.

Purpose of the Study:

• To introduce a new N=1 no-scale supergravity model.
• To explore F- and D-term breaking mechanisms within this framework.
• To analyze the resulting particle spectrum and symmetry breaking patterns.

Main Methods:

• Construction of a supersymmetric model with specific chiral and vector multiplets.
• Gauging of a nonanomalous axionic shift symmetry.
• Analysis of spontaneous symmetry breaking of both supersymmetry and gauge symmetry.

Main Results:

• A single real massless scalar remains in the spectrum.
• Spin-3/2, spin-1, and spin-1/2 particles acquire masses by sliding along a flat direction.
• Other degrees of freedom are absorbed by massive gravitino and vector bosons.
• The model is extendable to general gauge groups and matter content.

Conclusions:

• The proposed N=1 no-scale supergravity model provides a consistent framework for spontaneous symmetry breaking.
• The presence of a single massless scalar has significant phenomenological implications.
• The model's generalizability suggests broad applicability in theoretical particle physics.