Conformal GUT inflation, proton lifetime and non-thermal leptogenesis

Kumar，K. Sravan1,2,3; Moniz，Paulo Vargas1,4,5

2019-11-01

10.1140/epjc/s10052-019-7449-1

EUROPEAN PHYSICAL JOURNAL C   影响因子和分区

1434-6044

1434-6052

In this paper, we generalize Coleman–Weinberg (CW) inflation in grand unified theories (GUTs) such as SU (5) and SO (10) by means of considering two complex singlet fields with conformal invariance. In this framework, inflation emerges from a spontaneously broken conformal symmetry. The GUT symmetry implies a potential with a CW form, as a consequence of radiative corrections. The conformal symmetry flattens the above VEV branch of the CW potential to a Starobinsky plateau. As a result, we obtain ns∼1-2N and r∼12N2 for N∼ 50–60 e-foldings. Furthermore, this framework allow us to estimate the proton lifetime as τ≲ 10 years, whose decay is mediated by the superheavy gauge bosons. Moreover, we implement a type I seesaw mechanism by weakly coupling the complex singlet, which carries two units of lepton number, to the three generations of singlet right handed neutrinos (RHNs). The spontaneous symmetry breaking of global lepton number amounts to the generation of neutrino masses. We also consider non-thermal leptogenesis in which the inflaton dominantly decays into heavy RHNs that sources the observed baryon asymmetry. We constrain the couplings of the inflaton field to the RHNs, which gives the reheating temperature as 106GeV≲TR<109 GeV.

SCI

英语

NI期刊

通讯

[UID/MAT/00212/2013]

Physics

Physics, Particles & Fields

WOS:000505550100011

SPRINGER

PHYSICS

2-s2.0-85075217093

Scopus

1.Departamento de Física,Centro de Matemática e Aplicações (CMA-UBI),Universidade da Beira Interior,Covilhã,6200,Portugal
2.Southern University of Science and Technology (SUSTech),Shenzhen,518055,China
3.Van Swinderen Institute,University of Groningen,Groningen,9747 AG,Netherlands
4.DAMTP,University of Cambridge,Cambridge,Wilberforce Road,CB3 0WA,United Kingdom
5.Clare Hall,University of Cambridge,Cambridge,Hershel Road,CB3 9AL,United Kingdom

Kumar，K. Sravan,Moniz，Paulo Vargas. Conformal GUT inflation, proton lifetime and non-thermal leptogenesis[J]. EUROPEAN PHYSICAL JOURNAL C,2019,79(11).

Kumar，K. Sravan,&Moniz，Paulo Vargas.(2019).Conformal GUT inflation, proton lifetime and non-thermal leptogenesis.EUROPEAN PHYSICAL JOURNAL C,79(11).

Kumar，K. Sravan,et al."Conformal GUT inflation, proton lifetime and non-thermal leptogenesis".EUROPEAN PHYSICAL JOURNAL C 79.11(2019).