Conveners
Grand Unified Theories
- Nobuchika Okada (University of Alabama)
Grand Unified Theories
- Ilia Gogoladze (University of Delaware)
Grand Unified Theories
- Fei Wang (ZhengZhou University)
A minimal model of $SU(5)$ Grand Unification is proposed. The model is entirely built out of the first five lowest dimensional $SU(5)$ representations. Charged and neutral fermion mass generation mechanisms are non-trivially linked together. The main predictions of the model are that $(i)$ the neutrinos are Majorana particles, $(ii)$ one neutrino is massless, $(iii)$ the neutrinos have normal...
We propose a $SU(5) \times U(1)_{PQ}$ Majoron-axion model free of the axion domain wall, axion dark matter isocurvature, and $SU(5)$ monopole problems. The vectorlike fermions in the model are essential to achieving successful unification of the SM gauge couplings as well as the viability of the inflation scenarios. The $SU(5)$ symmetry is broken at $M_{GUT} \simeq (4-7)\times 10^{15}$ GeV and...
Abstract: In this talk I will present a model in which we minimally extend the Standard Model field content by adding new vector-like fermions at the TeV scale to allow gauge coupling unification at a realistic scale. We embed the model into a SU(5) GUT that is asymptotically safe and features an interacting fixed point for the gauge coupling. There are no Landau poles of the U(1) gauge ...
A new mechanism for the Higgs doublet being the light pseudo-Goldstone mode within SUSY SO(10) GUT will be presented.
Considered model exploits additional symmetries, which guarantee desirable symmetry breaking and natural all-order hierarchy. Some phenomenology, including a realistic fermion pattern, nucleon stability and gauge coupling unification, will be also discussed.
A 10 dimensional model with $\mathcal{N}=1$ SUSY and $E_8$ as a gauge symmetry will be presented. It will be shown that through the orbifold $\mathbb{𝑇}^6/(\mathbb{Z}_3\times\mathbb{z}_3$, only the Standard Model remains after compactification, with feasible Yukawa couplings. Gauge coupling unification can be achieved at energies as low as $M_{GUT}=10^7 GeV$ with a viable proton lifetime....
Ratios of nucleon decay rates between different channels can provide rich information about the specific GUT model realization in nature. To investigate this fingerprint in the context of SUSY GUTs and D=5 proton decay, we developed the software package SusyTCProton, which is an extension of the module SusyTC, itself to be used as a package of REAP. It takes the effective dimension 5...
We propose a pseudo-Goldstone boson dark matter (pGDM) particle in $SO(10)$ grand unified theory (GUT). Due to its Goldstone nature, this pGDM evades the direct DM detection experiments which, otherwise, severely constrain the parameter space of DM models. In $SO(10)$, the pGDM is embedded as a linear combination of the Standard Model (SM) singlet scalars in ${\bf 16_H}$ and ${\bf 126_H}$...
Imposing the gauge coupling unification and the Higgsino-like neutralino dark matter in our Universe, we perform a parameter scan for a simple parameter set in the Minimal Supersymmetric Standard Model, namely, the universal sfermion mass ($m_0$) and the universal gaugino mass at the GUT scale ($M$). We find that sparticle masses in the range of 10-100 TeV result in the lifetime of proton...
Attempts to account for the elementary properties of matter through a structure of extra spatial dimensions date from the theory of Kaluza 100 years ago. In more recent years, while there is still no clear evidence that extra dimensions of space exist, the origin of the structure of the Standard Model has become a central question in fundamental particle physics. We describe how a new...
Supersymmetric SO(10) theory with extra abelian symmetry in six spacetime dimensions can explain the multiplicity of quarks and lepton flavours. Bulk superfields charged under extra U(1) give rise to multiple 4D fields through magnetic flux compactification. Details of how the realistic fermion mass pattern arises in such a framework will be discussed and its prediction for the heavy and light...
We propose an SU(6) GUT, which enjoys a global symmetry of SU(2)*U(1)_{PQ}. The GUT breaking to the SM gauge symmetry undergoes two stages. The second stage of symmetry breaking scale corresponds to the axion physics scale. By studying the Peccei-Quinn quality constraint, we show an upper bound to the axion decay constant to be consistent with the classical axion window. The QCD axion, which...
We shall present a brand new study of the minimal renormalizable SO(10) Higgs model focusing on its perturbativity aspects. With an essentially complete grip on the one-loop corrections to its scalar spectrum one can identify the symmetry breaking chains featuring an intermediate SU(4)xSU(2)xU(1) symmetry as a practically unique option for a potentially realistic model building.
Although the minimal supersymmetric GUT has been proposed already some
years ago, its non-supersymmetric counterpart is, strangely enough,
not yet known. In this talk I will present some attempts in constructing
the minimal non-supersymmetric E6 scalar potential which leads to the SM
at low energy. This includes Higgs representations 27 and 351’, as well
as the more involved 650.
Neutron-antineutron ($n$-$\bar{n}$) oscillation is a baryon number violating process for which new constraints will be set in future experiments at ESS and DUNE. We study the impact of a potential $n$-$\bar{n}$ oscillation discovery on the baryon asymmetry of the Universe in an effective field theory framework. We extend our analysis by a simplified model connected to GUT for one of two...
