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Title: Inflation In A Realistic SO(10) Model

Abstract

We implement inflation within a realistic supersymmetric SO(10) model in which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek mechanism, the MSSM {mu} problem is resolved, and higgsino mediated dimension five nucleon decay is heavily suppressed. The cosmologically unwanted topological defects are inflated away, and from {delta}T/T, the B - L breaking scale is estimated to be of order 1016 - 1017 GeV. Including supergravity corrections, the scalar spectral index ns = 0.99 {+-} 0.01, with dns/dlnk {<=} 10-3.

Authors:
 [1]
  1. Korea Institute for Advanced Study, Cheongnyangni-dong, Dongdaemun-gu, Seoul 130-722 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20729209
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 805; Journal Issue: 1; Conference: PASCOS 2005: 11. international symposium on particles, strings, and cosmology, Gyeongju (Korea, Republic of), 30 May - 4 Jun 2005; Other Information: DOI: 10.1063/1.2149750; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CORRECTIONS; COSMOLOGY; GEV RANGE; INFLATIONARY UNIVERSE; NUCLEONS; PARTICLE DECAY; SCALARS; SO-10 GROUPS; SUPERGRAVITY; SUPERSYMMETRY; TOPOLOGY; TRIPLETS

Citation Formats

Kyae, Bumseok. Inflation In A Realistic SO(10) Model. United States: N. p., 2005. Web. doi:10.1063/1.2149750.
Kyae, Bumseok. Inflation In A Realistic SO(10) Model. United States. doi:10.1063/1.2149750.
Kyae, Bumseok. Fri . "Inflation In A Realistic SO(10) Model". United States. doi:10.1063/1.2149750.
@article{osti_20729209,
title = {Inflation In A Realistic SO(10) Model},
author = {Kyae, Bumseok},
abstractNote = {We implement inflation within a realistic supersymmetric SO(10) model in which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek mechanism, the MSSM {mu} problem is resolved, and higgsino mediated dimension five nucleon decay is heavily suppressed. The cosmologically unwanted topological defects are inflated away, and from {delta}T/T, the B - L breaking scale is estimated to be of order 1016 - 1017 GeV. Including supergravity corrections, the scalar spectral index ns = 0.99 {+-} 0.01, with dns/dlnk {<=} 10-3.},
doi = {10.1063/1.2149750},
journal = {AIP Conference Proceedings},
number = 1,
volume = 805,
place = {United States},
year = {Fri Dec 02 00:00:00 EST 2005},
month = {Fri Dec 02 00:00:00 EST 2005}
}
  • We implement inflation within a realistic supersymmetric SO(10) model in which the doublet-triplet splitting is realized through the Dimopoulos-Wilczek mechanism, the MSSM {mu} problem is resolved, and Higgsino mediated dimension five nucleon decay is heavily suppressed. The cosmologically unwanted topological defects are inflated away, and from {delta}T/T, the B-L breaking scale is estimated to be of order 10{sup 16}-10{sup 17} GeV. Including supergravity corrections, the scalar spectral index n{sub s}=0.99{+-}0.01, with vertical bar dn{sub s}/dlnk vertical bar < or approx. 10{sup -3}.
  • We discuss the smooth hybrid inflation scenario in the context of a simple supersymmetric SO(10) grand unified theory (GUT) in a 5D orbifold. In this GUT model, the SO(10) gauge symmetry is broken down to the Pati-Salam (PS) gauge group, SU(4){sub c} Multiplication-Sign SU(2){sub L} Multiplication-Sign SU(2){sub R}, by means of orbifold boundary conditions, and all matter and Higgs multiplets are placed only on the brane (PS brane) where only the PS symmetry is manifest. Further breaking of the Pati-Salam group to the standard model one is realized by means of vacuum expectation values of the Higgs multiplets (4,1,2) Circled-Plusmore » ( 4-bar ,1,2). The gauge coupling unification is successfully realized at M{sub GUT} = 4.6 Multiplication-Sign 10{sup 17} GeV after incorporating the threshold corrections of the Kaluza-Klein modes, with the compactification scale (assumed to be the same as the PS symmetry breaking scale) M{sub c} = v{sub PS} = 1.2 Multiplication-Sign 10{sup 16} GeV. We show that this orbifold GUT model can naturally lead us to smooth hybrid inflation, which turns out to be consistent with the Wilkinson Microwave Anisotropy Probe five-year data, with the M{sub GUT} and v{sub PS} predicted within the model.« less
  • The study of the MSSM in the large tan {beta} regime has to include correlations between the constraints presented by the low energy values of the {ital b} quark mass and BR(b{r_arrow}s{gamma}). Both quantities receive SUSY contributions enhanced by tan {beta} and have a major impact on the MSSM analysis. Here we summarize the results of such a study constrained by a complete SO(10) model. The dominant effects to the analysis come from third generation Yukawa couplings and a GUT threshold to {alpha}{sub s}. We show that a small negative GUT correction to {alpha}{sub s} accommodates {alpha}{sub s}(M{sub Z}){le}0.118 andmore » {delta}m{sub b}{sup SUSY}{gt}0. Since the latter quantity is positive this opens up two options to fit the measured rate for b{r_arrow}s{gamma}. The two distinct fits differ by the overall sign of the amplitude for this process. They work equally well in complementary regions of the allowed SUSY parameter space. We show plots of the partial contributions to the coefficient C{sub 7}(M{sub Z}) in the (m{sub 0},M{sub 1/2}) plane in each of these best fits. We conclude that an attractive SO(10)-derived regime of the MSSM remains a viable option. {copyright} {ital 1999} {ital The American Physical Society}« less
  • We have built a supersymmetric SO(10) model consistent with cosmological observations. The model gives rise to a false vacuum hybrid inflationary scenario which solves the monopole problem. We argue that this type of inflationary scenario arises naturally in supersymmetric SO(10) models. No external field or external symmetry has to be added. It can just be a consequence of the theory. In our specific model, at the end of inflation, cosmic strings form. The properties of the strings are presented. The cosmic background radiation anisotropies induced by the inflationary perturbations and the cosmic strings are estimated. The model produces a stablemore » lightest superparticle and a very light left-handed neutrino which may serve as the cold and hot dark matter. The properties of a mixed scenario of cosmic string and inflationary large-scale structure formation are discussed. {copyright} {ital 1996 The American Physical Society.}« less
  • Using a no-scale supergravity framework, we construct an SO(10) model that makes predictions for cosmic microwave background observables similar to those of the Starobinsky model of inflation, and incorporates a double-seesaw model for neutrino masses consistent with oscillation experiments and late-time cosmology. We pay particular attention to the behaviour of the scalar fields during inflation and the subsequent reheating.