Grand unified theories and proton decay

Langacker, Paul

doi:10.1016/0370-1573(81)90059-4

Cited by 1,282 publications

(772 citation statements)

References 412 publications

Supporting

Mentioning

740

Contrasting

Unclassified

Order By: Relevance

“…However, SU(3) × SU(3) cannot describe particles of integer and fractional charge and therefore it is also excluded. Thus, the only group of rank 4 which remains is SU(5) [43].…”

Section: Grand Unified Theoriesmentioning

confidence: 99%

See 1 more Smart Citation

How generic is cosmic string formation in supersymmetric grand unified theories

2003

View full text Add to dashboard Cite

We study cosmic string formation within supersymmetric grand unified theories. We consider gauge groups having a rank between 4 and 8. We examine all possible spontaneous symmetry breaking patterns from the GUT down to the standard model gauge group. Assuming standard hybrid inflation, we select all the models which can solve the GUT monopole problem, lead to baryogenesis after inflation and are consistent with proton lifetime measurements. We conclude that in all acceptable spontaneous symmetry breaking schemes, cosmic string formation is unavoidable. The strings which form at the end of inflation have a mass which is proportional to the inflationary scale. Sometimes, a second network of strings form at a lower scale. Models based on gauge groups which have rank greater than 6 can lead to more than one inflationary era; they all end by cosmic string formation.

show abstract

“…However, SU(3) × SU(3) cannot describe particles of integer and fractional charge and therefore it is also excluded. Thus, the only group of rank 4 which remains is SU(5) [43].…”

Section: Grand Unified Theoriesmentioning

confidence: 99%

“…In principle, SU(n) may not be anomaly free [46]; more precisely it depends on the chosen fermionic representation [43]. We assume that the SU(n) groups which we use have indeed a fermionic representation that certifies that the model is anomaly free.…”

Section: Grand Unified Theoriesmentioning

confidence: 99%

How generic is cosmic string formation in supersymmetric grand unified theories

2003

View full text Add to dashboard Cite

show abstract

“…This type of interaction can lead to baryon number violating nucleon decays. The simplest GUT, minimal SU(5) [1], predicts the partial lifetime of a proton via the mode p → e + π 0 to be ∼ 10 31±1 years [2,3], which was excluded by the IMB and KAMIOKANDE experiments [4,5].…”

mentioning

confidence: 99%

Search for nucleon decay into charged antilepton plus meson in Super-Kamiokande I and II

Nishino¹,

Abe²,

Hayato³

et al. 2012

Phys. Rev. D

101

View full text Add to dashboard Cite

Searches for a nucleon decay into a charged anti-lepton (e + or µ + ) plus a light meson (π 0 , π − , η, ρ 0 , ρ − , ω) were performed using the Super-Kamiokande I and II data. Twelve nucleon decay modes were searched for. The total exposure is 140.9 kiloton·years, which includes a 91.7 kiloton·year exposure (1489.2 live days) of Super-Kamiokande-I and a 49.2 kiloton·year exposure (798.6 live days) of Super-Kamiokande-II. The number of candidate events in the data was consistent with the atmospheric neutrino background expectation. No significant evidence for a nucleon decay was observed in the data. Thus, lower limits on the nucleon partial lifetime at 90% confidence level were obtained. The limits range from 3.6 × 10 31 to 8.2 × 10 33 years, depending on the decay modes.

show abstract

“…Grand Unified baryogenesis (for a review see [6]) was the first implementation of Sakharov's baryon number generation ideas. There are at least three reasons why this is an attractive mechanism.…”

Section: Our Favorite Modelsmentioning

confidence: 99%