Intermediate mass scale of SU(N) grand unification with nontrivial charge assignment

We demonstrate to two-loop order that an intermediate symmetrically embedded Pati–Salam SU(2)L×SU(2)R×SU(4) level of symmetry is all that is necessary to accommodate empirical values of α(Mz), αs(Mz) and sin 2θw(Mz) within a grand unification context but with a high (1014 GeV) intermediate mass scale and with a concomitant higher GUT scale.

Download Full-text

Theorem on vanishing contributions to sin2θW and the intermediate mass scale in grand unified theories with trinification symmetry

Physical Review D ◽

10.1103/physrevd.101.055039 ◽

2020 ◽

Vol 101 (5) ◽

Cited By ~ 1

Author(s):

Chandini Dash ◽

Snigdha Mishra ◽

Sudhanwa Patra

Keyword(s):

Mass Scale ◽

Intermediate Mass ◽

Grand Unified Theories ◽

Unified Theories

Download Full-text

OBSERVABLES IN SUPERSTRING INSPIRED MODELS WITH INTERMEDIATE MASS SCALES

Modern Physics Letters A ◽

10.1142/s0217732387000173 ◽

1987 ◽

Vol 02 (02) ◽

pp. 133-143 ◽

Cited By ~ 5

Author(s):

F. FERUGLIO ◽

F. GABBIANI

Keyword(s):

Mass Spectra ◽

Group Analysis ◽

Mass Scale ◽

Low Energy ◽

Model Group ◽

Intermediate Mass ◽

Renormalization Group Analysis ◽

Energy Scenario ◽

The Standard Model ◽

Scale Down

We build a realistic E6 superstring inspired model with intermediate mass scales, which has the characteristic feature of containing no extra U(1) factors in the low energy scenario. This may be acquired starting from a suitable Calabi-Yau compactification with b1.1>1, such to give rise, after Hosotani breaking, to the rank r=5 gauge group SU (3)C× SU (2)L×U(1)Y× U (1)E, that is broken at an intermediate mass scale down to the standard model group. The minimization of the low energy effective potential and the renormalization group analysis are quantitatively performed, yielding viable mass spectra.

Download Full-text

Axions at the Intermediate Mass Scale in SUSY SU(5) Models

Progress of Theoretical Physics ◽

10.1143/ptp.70.1084 ◽

1983 ◽

Vol 70 (4) ◽

pp. 1084-1090

Author(s):

T. Watanabe ◽

N. Toyota

Keyword(s):

Mass Scale ◽

Intermediate Mass

Download Full-text

Intermediate mass scales in supersymmetric SO(10) grand unification

Physics Letters B ◽

10.1016/0370-2693(82)90487-7 ◽

1982 ◽

Vol 114 (4) ◽

pp. 243-246 ◽

Cited By ~ 10

Author(s):

L.E. Ibáñez

Keyword(s):

Grand Unification ◽

Intermediate Mass

Download Full-text

Opening the 1 Hz axion window

Journal of High Energy Physics ◽

10.1007/jhep01(2021)169 ◽

2021 ◽

Vol 2021 (1) ◽

Author(s):

David J. E. Marsh ◽

Wen Yin

Keyword(s):

Decay Constant ◽

Mass Scale ◽

Grand Unification ◽

A Value ◽

Relic Density ◽

Open Window ◽

Gut Scale ◽

Near Future ◽

M Theory ◽

The Universe

Abstract An axion-like particle (ALP) with mass mϕ ∼ 10−15 eV oscillates with frequency ∼1 Hz. This mass scale lies in an open window of astrophysical constraints, and appears naturally as a consequence of grand unification (GUT) in string/M-theory. However, with a GUT-scale decay constant such an ALP overcloses the Universe, and cannot solve the strong CP problem. In this paper, we present a two axion model in which the 1 Hz ALP constitutes the entirety of the dark matter (DM) while the QCD axion solves the strong CP problem but contributes negligibly to the DM relic density. The mechanism to achieve the correct relic densities relies on low-scale inflation (mϕ ≲ Hinf ≲ 1 MeV), and we present explicit realisations of such a model. The scale in the axion potential leading to the 1 Hz axion generates a value for the strong CP phase which oscillates around $$ {\overline{\theta}}_{\mathrm{QCD}}\sim {10}^{-12} $$ θ ¯ QCD ∼ 10 − 12 , within reach of the proton storage ring electric dipole moment experiment. The 1 Hz axion is also in reach of near future laboratory and astrophysical searches.

Download Full-text