Moduli induced cogenesis of baryon asymmetry and dark matter

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• 作者：Mansi Dhuria^a ; ^{mansi@prl.res.in" class="auth_mail" title="E-mail the corresponding author} ; Chandan Hati^a ; ^b ; ^{chandan@prl.res.in" class="auth_mail" title="E-mail the corresponding author} ; Utpal Sarkar^a ; ^{utpal@prl.res.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Moduli decay ; Baryogenesis ; Dark matter ; LVS
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 May 2016
• 年：2016
• 卷：756
• 期：Complete
• 页码：376-383
• 全文大小：380 K

文摘

We study a cogenesis mechanism in which the observed baryon asymmetry of the universe and the dark matter abundance can be produced simultaneously at low reheating temperature without violating baryon number in the fundamental interactions. In particular, we consider a model which can be realized in the context of type IIB large volume string compactifications. The matter superfields in this model include additional pairs of color triplet and singlet superfields in addition to the Minimal Supersymmetric Standard Model (MSSM) superfields. Assuming that the mass of the additional singlet fermions is O(GeV)$\mathcal{O}(\text{GeV})$ and of the color triplet fermions is O(TeV)$\mathcal{O}(\text{TeV})$, we show that the modulus dominantly decays into the additional color triplet superfields. After soft supersymmetry (SUSY) breaking, the lightest eigenstate of scalar component of color triplet superfield further decays into fermionic component of singlet superfield and quarks without violating baryon number. Imposing discrete Z₂${\mathcal{Z}}_2$ symmetry, it follows that the singlet fermion will not further decay into the SM particles and therefore it can be considered as a stable asymmetric dark matter (ADM) component. We find that the decay of the lightest eigenstate of scalar component of color triplet superfield gives the observed baryon asymmetry in the visible sector, an asymmetric dark matter component with the right abundance and naturally explains cosmic coincidence.