scholarly journals Leptogenesis in \(A_4\) Flavor Symmetry Model by Renormalization Group Evolution

2014 ◽  
Vol 24 (1) ◽  
pp. 9
Author(s):  
Nguyen Thanh Phong
Keyword(s):  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Flavor Symmetry ◽  
Current Observation ◽  
Light Neutrino Mass ◽  
Group Evolution ◽  
Mixing Matrix ◽  
High Energy Scale ◽  
Gut Scale

We study how leptogenesis can be implemented in the seesaw models with \(A_4\) flavor symmetry, which lead to the tri-bimaximalneutrino mixing matrix. By considering renormalzation groupevolution from a high energy scale of flavor symmetry breaking(the GUT scale is assumed) to the low energy scale of relevantphenomena, the off-diagonal terms in a combination of DiracYukawa-coupling matrix can be generated. As aresult, the flavored leptogenesis is successfully realized. Wealso investigate how the effective light neutrino mass \(|\langle m_{ee}\rangle |\) associated with neutrinoless double beta decaycan be predicted byimposing the experimental data on the low energy observables. Wefind a link between the leptogenesis and the neutrinoless doublebeta decay characterized by \(|\langle m_{ee}\rangle|\) through ahigh energy CP phase $\phi$, which is correlated with the lowenergy Majorana CP phases. It is shown that the predictions of \(|\langle m_{ee}\rangle|\) for some fixed parameters of the highenergy physics can be constrained by the current observation ofbaryon asymmetry.

scholarly journals RENORMALIZATION GROUP EVOLUTION OF NEUTRINO MASSES AND MIXING IN SEESAW MODELS

2010 ◽  
Vol 25 (23) ◽  
pp. 4339-4384 ◽  
Author(s):  
SHAMAYITA RAY
Keyword(s):  
Renormalization Group ◽  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Effective Theory ◽  
Neutrino Masses ◽  
Mixing Parameters ◽  
Group Evolution ◽  
High Energy Scale ◽  
The Masses

We consider different extensions of the Standard Model which can give rise to the small active neutrino masses through seesaw mechanisms, and their mixing. These tiny neutrino masses are generated at some high energy scale by the heavy seesaw fields which then get sequentially decoupled to give an effective dimension-5 operator at the low energy. The renormalization group evolution of the masses and the mixing parameters of the three active neutrinos in the high energy as well as the low energy effective theory is reviewed in this paper.

scholarly journals SPONTANEOUS PHYSICAL COMPACTIFICATION OF THE EXTRA DIMENSIONS

2001 ◽  
Vol 16 (36) ◽  
pp. 2327-2333
Author(s):  
TIANJUN LI
Keyword(s):  
Symmetry Breaking ◽  
Extra Dimensions ◽  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Temperature Dependent ◽  
Supergravity Theory ◽  
Brane Model ◽  
High Energy Scale ◽  
Bulk Cosmological Constant

We conjecture that the extra dimensions are physical noncompact at high energy scale or high temperature; after the symmetry breaking or cosmological phase transition, the bulk cosmological constant may become negative, and then, the extra dimensions may become physical compact at low energy scale. We show this in a five-dimensional toy brane model with three parallel three-branes and a real bulk scalar whose potential is temperature-dependent. We also point out that after the global or gauge symmetry breaking, or the supersymmetry breaking in supergravity theory, the spontaneous physical compactification of the extra dimensions might be realized.

scholarly journals Correlations between low energy leptonic CP violation and leptogenesis in the light of recent experiments

2014 ◽  
Vol 29 (20) ◽  
pp. 1450104
Author(s):  
H. Zeen Devi
Keyword(s):  
Cp Violation ◽  
High Energy ◽  
Energy Scale ◽  
Low Energy ◽  
Type I ◽  
Planck Data ◽  
Cp Violations ◽  
Neutrino Sector ◽  
High Energy Scale ◽  
The Universe

Leptogenesis is the most favorable mechanism for generating the observed baryon asymmetry of the universe (BAU) which implies CP violation in the high energy scale. The low energy leptonic CP violation is expected to be observed in the neutrino oscillations and 0ν2β decay experiments. Generally, it is not possible to connect both the CP violations. Here we revisit the issue of connecting the two in flavored leptogenesis scenario within the Type I seesaw in the light of recent neutrino oscillation and Planck data. With the recent precise measurements of θ13 and BAU, we are able to find new correlations between the low and high energy CP violating phases when leptogenesis occurs at temperature between 109 to 1012 GeV and there is no contribution to CP violation from the heavy neutrino sector.

scholarly journals Radiatively Generated Leptogenesis inS4Flavor Symmetry Models

2012 ◽  
Vol 2012 ◽  
pp. 1-21 ◽  
Author(s):  
T. Phong Nguyen ◽  
P. V. Dong
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
High Energy Physics ◽  
Neutrinoless Double Beta Decay ◽  
High Energy ◽  
Energy Scale ◽  
Double Beta Decay ◽  
Low Energy ◽  
Flavor Symmetry ◽  
Neutrino Mixing

We study how leptogenesis can be implemented in the seesaw models withS4flavor symmetry, which lead to the tri-bimaximal neutrino mixing matrix. By considering renormalization group evolution from a high-energy scale of flavor symmetry breaking (the GUT scale is assumed) to the low-energy scale of relevant phenomena, the off-diagonal terms in a combination of Dirac Yukawa-coupling matrix can be generated and the degeneracy of heavy right-handed neutrino Majorana masses can be lifted. As a result, the flavored leptogenesis is successfully realized. We also investigate how the effective light neutrino mass|〈mee〉|associated with neutrinoless double beta decay can be predicted along with the neutrino mass hierarchies by imposing the experimental data on the low-energy observables. We find a link between the leptogenesis and the neutrinoless double beta decay characterized by|〈mee〉|through a high-energy CP phase ϕ, which is correlated with the low-energy Majorana CP phases. It is shown that the predictions of|〈mee〉|for some fixed parameters of the high-energy physics can be constrained by the current observation of baryon asymmetry.

scholarly journals UNIVERSAL MASS MATRIX AND LEPTONIC θ13 ANGLE

2011 ◽  
Vol 26 (09) ◽  
pp. 661-667 ◽  
Author(s):  
HIROYUKI NISHIURA ◽  
TAKESHI FUKUYAMA
Keyword(s):  
Mass Matrix ◽  
High Energy ◽  
Energy Scale ◽  
Unitary Matrix ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Lepton Universality ◽  
Mass Matrices ◽  
Mixing Matrix ◽  
High Energy Scale

We propose a universal mixing hypothesis between quark and lepton sectors at high energy scale (probably GUT scale) where quark–lepton universality holds. Namely in the charged lepton diagonal base, all the other mass matrices for up and down quarks and neutrinos are diagonalized by the same unitary matrix except for the phase elements. Thanks to this hypothesis, the observed values of the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix and the mixing angles θ12 and θ23 in the Maki–Nakagawa–Sakata (MNS) lepton mixing matrix can predict the unknown magnitudes of the mixing angle θ13 and of the CP violating Dirac phase δ in the MNS matrix. Their allowed regions are rather narrow, 0.036 < sin θ13 < 0.048 and 6° < δ < 12°.

scholarly journals Beginning of Universe through large field hybrid inflation

2015 ◽  
Vol 30 (21) ◽  
pp. 1550106 ◽  
Author(s):  
Tatsuo Kobayashi ◽  
Osamu Seto
Keyword(s):  
Gravitational Wave ◽  
Early Universe ◽  
High Energy ◽  
Wave Mode ◽  
Energy Scale ◽  
Large Field ◽  
Tensor Perturbation ◽  
Expectation Value ◽  
Hybrid Inflation ◽  
High Energy Scale

Recent detection of B-mode polarization induced from tensor perturbations by the BICEP2 experiment implies the so-called large field inflation, where an inflaton field takes super-Planckian expectation value during inflation, at a high energy scale. We show however, if another inflation follows hybrid inflation, the hybrid inflation can generate a large tensor perturbation with not super-Planckian but Planckian field value. This scenario would relax the tension between BICEP2 and Planck concerning the tensor-to-scalar ratio, because a negative large running can also be obtained for a certain number of e-fold of the hybrid inflation. A natural interpretation of a large gravitational wave mode with or without the scalar spectral running might be multiple inflation in the early Universe.

scholarly journals The origin of a high-energy scale in the Pomeron calculus

1975 ◽  
Vol 56 (5) ◽  
pp. 465-469 ◽  
Author(s):  
D. Amati ◽  
R. Jengo
Keyword(s):  
High Energy ◽  
Energy Scale ◽  
High Energy Scale

scholarly journals Exact integration of the high energy scale in doped Mott insulators

2008 ◽  
Vol 77 (1) ◽  
Author(s):  
Ting-Pong Choy ◽  
Robert G. Leigh ◽  
Philip Phillips ◽  
Philip D. Powell
Keyword(s):  
High Energy ◽  
Energy Scale ◽  
Mott Insulators ◽  
Exact Integration ◽  
High Energy Scale

scholarly journals F(R)Gravity’s Rainbow and Its Einstein Counterpart

2016 ◽  
Vol 2016 ◽  
pp. 1-21 ◽  
Author(s):  
S. H. Hendi ◽  
B. Eslam Panah ◽  
S. Panahiyan ◽  
M. Momennia
Keyword(s):  
High Energy ◽  
Momentum Tensor ◽  
Energy Scale ◽  
Geometrical Properties ◽  
Conformally Invariant ◽  
Gravity’S Rainbow ◽  
Gravity's Rainbow ◽  
High Energy Scale ◽  
Energy Dependent ◽  
Thermodynamical Behavior

Motivated by UV completion of general relativity with a modification of a geometry at high energy scale, it is expected to have an energy dependent geometry. In this paper, we introduce charged black hole solutions with power Maxwell invariant source in the context of gravity’s rainbow. In addition, we investigate two classes ofF(R)gravity’s rainbow solutions. At first, we study energy dependentF(R)gravity without energy-momentum tensor, and then we obtainF(R)gravity’s rainbow in the presence of conformally invariant Maxwell source. We study geometrical properties of the mentioned solutions and compare their results. We also give some related comments regarding thermodynamical behavior of the obtained solutions and discuss thermal stability of the solutions.

A new high‐energy scale?

Physics Today ◽  
1972 ◽  
Vol 25 (4) ◽  
pp. 23-28 ◽  
Author(s):  
T. D. Lee
Keyword(s):  
High Energy ◽  
Energy Scale ◽  
High Energy Scale
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