<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>−</mml:mo><mml:mi>L</mml:mi></mml:math>cosmic strings and baryogenesis

Bhattacharjee, Pijushpani; Sahu, Narendra; Yajnik, Urjit A.

doi:10.1103/physrevd.70.083534

Cited by 10 publications

(17 citation statements)

References 44 publications

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“…As discussed in Ref. [11,12,13,14,15,16], the decaying, collapsing closed loops of these strings can be a nonthermal source of the right-handed neutrinos whose subsequent decay can contribute to the BAU.…”

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confidence: 99%

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Constraint onB–Lcosmic string from leptogenesis with degenerate neutrinos

Gu¹,

Mao²

2005

Physics Letters B

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In the early Universe, as a consequence of U (1) B−L gauge symmetry-breaking, the so-called B−L cosmic strings are expected to be produced at the breaking scale η B−L according to the Kibble mechanism. The decaying, collapsing closed loops of these strings can release the right-handed neutrinos, whose subsequent decay can contribute to the baryon asymmetry of the Universe (BAU), through the "slow death"(SD) process and/or the "quick death"(QD) process. In this paper, we assume that the decay of the lightest heavy Majorana neutrinos released from the B − L cosmic string loops can produce a baryon asymmetry consistent with the cosmic microwave background (CMB) observations. Considering the fact that both the neutrinoless double beta decay experiment and the cosmological data show a preference for degenerate neutrinos, we give the lower limits for the breaking scale η B−L with the neutrino masses 0.06eV ≤m = (m 2 1 +m 2 2 +m 2 3 ) 1/2 ≤ 1.0eV, where the full possible cases of degenerate neutrinos are included. We obtain η B−L > ∼ 3.3 × 10 15 GeV, 5.3 × 10 15 GeV and 9.5 × 10 15 GeV form = 0.2eV, 0.4eV and 1.0eV respectively in the SD process, and find the B − L cosmic string has a very small contribution to the BAU in the QD process.

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confidence: 99%

“…[16] and assume that the lightest heavy . In this range ofm, the full possible cases of degenerate neutrinos are included.…”

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confidence: 99%

Constraint onB–Lcosmic string from leptogenesis with degenerate neutrinos

Gu¹,

Mao²

2005

Physics Letters B

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“…This work has proposed utilization for particle and nuclear studies with the thought that string stimulation due to the innovation can progress the subjects. For example, string experimentation can allow for greater insight about diversity of particles as mesons (Novikov, Shifman, Vainshtein, & Zakharov 1981;Schäfer & Shuryak 1998) or lack of bodies including for cosmological issues as baryogenesis (Dasgupta 1997;Bhattacharjee, Sahu, & Yajnik 2004). Well-discussed questions, e.g.…”

Section: Discussionmentioning

confidence: 99%

String Experiments for the Nuclear and Particle Sciences and Non-Physics Disciplines

Tahan¹

2015

EER

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“…Here For example, the value of Y N 1 estimated from topological defects [38] can be different from thermal scenario [7,14]. In the present case we will restrict ourselves to thermal scenario only.…”

Section: Estimation Of Lepton Asymmetrymentioning

confidence: 99%

“…Substituting the type-II phase choice relation (38) in (53) and comparing with the observed value (52) of the baryon asymmetry we get the bound…”

Section: Estimation Of Lepton Asymmetrymentioning

confidence: 99%

Heavy neutrino mass hierarchy from leptogenesis in left–right symmetric models with spontaneous CP-violation

Sahu¹,

Sankar²

2005

Nuclear Physics B

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We consider left-right symmetric model with spontaneous CP-violation. The Lagrangian of this model is CP invariant and the Yukawa couplings are real. Due to spontaneous breaking of the gauge symmetry, some of the neutral Higgses acquire complex vacuum expectation values, which lead to CP-violation. In the model considered here, we identify the neutrino Dirac mass matrix with that of Fritzsch type charged lepton mass matrix. We assume a hierarchical spectrum of the right handed neutrino masses and derive a bound on this hierarchy by assuming that the decay of the lightest right handed neutrino produces the baryon asymmetry via the leptogenesis route. It is shown that the mass hierarchy we obtain is compatible with the current neutrino oscillation data.

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B−Lcosmic strings and baryogenesis

Cited by 10 publications

References 44 publications

Constraint onB–Lcosmic string from leptogenesis with degenerate neutrinos

Constraint onB–Lcosmic string from leptogenesis with degenerate neutrinos

String Experiments for the Nuclear and Particle Sciences and Non-Physics Disciplines

Heavy neutrino mass hierarchy from leptogenesis in left–right symmetric models with spontaneous CP-violation

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