Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2022)122
Keywords
Grand Unification; Renormalization Group; Models of Quantum Gravity
Categories
Funding
- Royal Society International Newton Fellowship [NIF\R1\191008]
- PRIME programme of the German Academic Exchange Service (DAAD)
- German Federal Ministry of Education and Research (BMBF)
- Polish National Science Centre [2018/29/N/ST2/01743, 2020/36/T/ST2/00409]
- IN2P3 project Theorie -BSMGA
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This article investigates radiative symmetry breaking, constrains the viable initial conditions for scalar couplings, and outlines the feasible parameter space of any underlying theory of quantum gravity. The constraining power of the blueprint is demonstrated within a non-supersymmetric SO(10) grand unification theory.
Grand unification of gauge couplings and fermionic representations remains an appealing proposal to explain the seemingly coincidental structure of the Standard Model. However, to realise the Standard Model at low energies, the unified symmetry group has to be partially broken by a suitable scalar potential in just the right way. The scalar potential contains several couplings, whose values dictate the residual symmetry at a global minimum. Some (and possibly many) of the corresponding symmetry-breaking patterns are incompatible with the Standard Model and therefore non-admissible. Here, we initiate a systematic study of radiative symmetry breaking to thereby constrain viable initial conditions for the scalar couplings, for instance, at the Planck scale. We combine these new constraints on an admissible scalar potential with well-known constraints in the gauge-Yukawa sector into a general blueprint that carves out the viable effective-field-theory parameter space of any underlying theory of quantum gravity. We exemplify the constraining power of our blueprint within a non-supersymmetric SO(10) GUT containing a 16(H)- and a 45(H)-dimensional scalar representation. We explicitly demonstrate that the requirement of successful radiative symmetry breaking to the correct subgroups significantly constraints the underlying microscopic dynamics. The presence of non-admissible radiative minima can even entirely exclude specific breaking chains: in the SO(10) example, Pati-Salam breaking chains cannot be realised since the respective minima are never the deepest ones.
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