New aspects of leptogenesis bounds

Abstract

We present a general analysis that reveals new aspects of the leptogenesis bounds on neutrino masses and on the reheat temperature of the Universe. After revisiting a known effect coming from an unbounded term in the total CP asymmetry, we show that an unbounded term in the flavored CP asymmetries has a stronger impact. It relaxes the lower bound on the reheat temperature down to 10^8 GeV for (M_2-M_1)/M_1=O(1-100) and for a mild tuning of the parameters in the see-saw orthogonal matrix. We also consider the effect of the Higgs asymmetry, showing that it lowers the upper bound on the neutrino masses in the so-called fully flavored regime where classic Boltzmann equations can be used. Imposing independence of the initial conditions contributes to lower the upper bound on neutrino masses as well. We study the conditions for the validity of the usual N_1-dominated scenario and for the applicability of the lower bound on the lightest right-handed (RH) neutrino mass M_1. We find that except for the two effective RH neutrino scenario, recovered for M_3 >>10^14 GeV, and for values M_2 < O(10^11 GeV), the final asymmetry is more naturally dominated by the contribution from N_2-decays. Finally, we confirm in a general way that going beyond the hierarchical limit, the effect of washout addition makes the lower bound on M_1 more stringent for (M_2-M_1)/M_1=O(0.1).

45 pages, 15 figures; v2: minor changes, added Ref.'s, typo corrected in Eq. (1); to appear on NPB

References in corpus (49)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Oscillating neutrinos and mu --> e, gamma
• A lower bound on the right-handed neutrino mass from leptogenesis
• Leptogenesis for Pedestrians
• Towards a complete theory of thermal leptogenesis in the SM and MSSM
• CP violating decays in leptogenesis scenarios
• Phenomenology with Massive Neutrinos
• Baryogenesis through leptogenesis
• The importance of flavor in leptogenesis
• Flavour Issues in Leptogenesis
• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Electroweak-Scale Resonant Leptogenesis
• Cosmological Sign of Neutrino CP Violation
• Cosmic Microwave Background, Matter-Antimatter Asymmetry and Neutrino Masses
• Flavour Matters in Leptogenesis
• The Neutrino Mass Window for Baryogenesis
• Constraints on neutrino masses from leptogenesis models
• Flavor effects on leptogenesis predictions
• Leptogenesis from $\tilde{N}$-dominated early universe
• Leptogenesis and Low Energy CP Violation in Neutrino Physics
• Connecting Low Energy Leptonic CP-violation to Leptogenesis
• On the Baryon, Lepton-Flavour and Right-Handed Electron Asymmetries of the Universe
• Protecting the Primordial Baryon Asymmetry From Erasure by Sphalerons
• Primordial Lepton Family Asymmtries in Seesaw Model
• Flavoured leptogenesis: a successful thermal leptogenesis with N_1 mass below 10^8 GeV
• Seesaw geometry and leptogenesis
• Predictions of the most minimal see-saw model
• Leptogenesis with Almost Degenerate Majorana Neutrinos
• Spectator processes and baryogenesis
• Some Aspects of Thermal Leptogenesis
• The importance of N2 leptogenesis
• A new bridge between leptonic CP violation and leptogenesis
• On Higgs and sphaleron effects during the leptogenesis era
• The See-Saw Mechanism, Neutrino Yukawa Couplings, LFV Decays l_i to l_j + gamma and Leptogenesis
• On the Impact of Flavour Oscillations in Leptogenesis
• Quantum Zeno effect and the impact of flavor in leptogenesis
• Leptogenesis beyond the limit of hierarchical heavy neutrino masses
• On Resonant Leptogenesis
• Towards constraints on the SUSY seesaw from flavour-dependent leptogenesis
• The Interplay Between the "Low" and "High" Energy CP-Violation in Leptogenesis
• Neutrino properties from Yukawa structure
• Flavour and polarisation in heavy neutrino production at e+ e- colliders
• Limits on $T_{RH}$ for thermal leptogenesis with hierarchical neutrino masses
• Viability of Dirac phase leptogenesis
• Patterns of Lepton-Flavour Violation Motivated by Decoupling and Sneutrino Inflation
• Leptogenesis and a Jarlskog Invariant
• Effects of Lightest Neutrino Mass in Leptogenesis
• News on Leptogenesis

Cited by in corpus (59)

• A White Paper on keV Sterile Neutrino Dark Matter
• The Phenomenology of Right Handed Neutrinos
• Baryogenesis from the weak scale to the grand unification scale
• Low-Scale Leptogenesis in the Scotogenic Neutrino Mass Model
• Flavor effects in leptogenesis
• The minimal scenario of leptogenesis
• Leptogenesis in the two right-handed neutrino model revisited
• Leptogenesis: beyond the minimal type I seesaw scenario
• Three-Flavoured Non-Resonant Leptogenesis at Intermediate Scales
• Successful type I Leptogenesis with SO(10)-inspired mass relations
• Non-unitary Leptonic Mixing and Leptogenesis
• Unifying leptogenesis, dark matter and high-energy neutrinos with right-handed neutrino mixing via Higgs portal
• The problem of the initial conditions in flavoured leptogenesis and the tauon N_2-dominated scenario
• Leptogenesis from Low Energy $CP$ Violation
• A fuller flavour treatment of N_2-dominated leptogenesis
• Type-I Seesaw as the Common Origin of Neutrino Mass, Baryon Asymmetry, and the Electroweak Scale
• Fermion Dark Matter with $N_2$ Leptogenesis in Minimal Scotogenic Model
• A consistent model for leptogenesis, dark matter and the IceCube signal
• Successful $N_2$ leptogenesis with flavour coupling effects in realistic unified models
• Decrypting $SO(10)$-inspired leptogenesis
• Leptogenesis with small violation of B-L
• From Dirac neutrino masses to baryonic and dark matter asymmetries
• On the origin of matter in the Universe
• Low-scale leptogenesis assisted by a real scalar singlet
• SO(10)-inspired solution to the problem of the initial conditions in leptogenesis
• On the Vanishing of the CP Asymmetry in Leptogenesis due to Form Dominance
• Theoretical Overview of Neutrino Properties
• Scalar dark matter and leptogenesis in the minimal scotogenic model
• Baryogenesis via Leptogenesis in Adjoint SU(5)
• Strong thermal leptogenesis and the absolute neutrino mass scale
• Leptogenesis in the Neutrino Option
• Leptogenesis with an almost conserved lepton number
• Lepton asymmetry rate from quantum field theory: NLO in the hierarchical limit
• Supersymmetric $SO(10)$-inspired leptogenesis and a new $N_2$-dominated scenario
• Minimal seesaw and leptogenesis with the smallest modular finite group
• Threshold effects in SO(10) models with one intermediate breaking scale
• Lower Bound on the Garvitino Mass $m_{3/2}>O(100)$ TeV in $R$-Symmetry Breaking New Inflation
• A full analytic solution of $SO(10)$-inspired leptogenesis
• Density matrix calculation of the dark matter abundance in the Higgs induced right-handed neutrino mixing model
• Leptogenesis in crossing and runaway regimes
• New ways to TeV scale leptogenesis
• Strong thermal $SO(10)$-inspired leptogenesis in the light of recent results from long-baseline neutrino experiments
• Mirror symmetry: from active and sterile neutrino masses to baryonic and dark matter asymmetries
• Examining leptogenesis with lepton flavor violation and the dark matter abundance
• An SO(10) \times SO(10)' model for common origin of neutrino masses, ordinary and dark matter-antimatter asymmetries
• Thermal leptogenesis, dark matter, and gravitational waves from an extended canonical seesaw scenario
• Generation of neutrino dark matter, baryon asymmetry, and radiation after quintessential inflation
• On the Role of Low-Energy CP Violation in Leptogenesis
• Dark matter as the source of neutrino mass: theory overview and experimental prospects
• Purely flavored leptogenesis from a sudden mass gain of right-handed neutrinos
• Wash-Out in N_2-dominated leptogenesis
• A New Era of Leptogenesis
• Low scale leptogenesis under neutrino $\mu$-$\tau$ reflection symmetry
• Neutrino masses, leptogenesis and dark matter
• Insights on the Scale of Leptogenesis from Neutrino Masses and Neutrinoless Double-Beta Decay
• Leptogenesis with dynamical couplings
• Beyond the Standard Model with leptogenesis and neutrino data
• Developments in Leptogenesis
• Completing RHINO