Conveners
Parallel Session I.1
- Mu-Chun Chen
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Débora Marques Barreiros28/06/2022, 16:45
I will discuss our recent work on the contribution to leptogenesis of a complex scalar singlet added to the type-I seesaw extension of the Standard Model. In this scenario, CP is broken spontaneously from the complex vacuum expectation value of the new scalar rather than the complex character of yukawa couplings, allowing to explain leptonic CP violation at the electroweak scale and also...
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Kuldeep Deka28/06/2022, 17:00
We consider an anomaly-free U(1) extension of the Standard Model with three right-handed neutrinos (RHNs) and two complex scalars, wherein the charge assignments preclude all tree-level mass terms for the neutrinos. Considering this setup, in turn, to be only a low-energy effective theory, we introduce higher-dimensional terms {\em a la} Froggatt-Nielsen to naturally generate tiny neutrino...
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Bowen Fu28/06/2022, 17:15
The long-existing problem of neutrino mass and mixing can be connected to cosmological phenomena, such as the leptogenesis and the existence of dark matter (DM). In the extension of the type I seesaw model with two right-handed (RH) neutrinos, the seesaw Yukawa can drive the DM production, even with the competition from gravitational effect and constraints from leptogenesis. However, the DM...
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Pablo Martinez-Mirave (IFIC (CSIC-Univ. Valencia))28/06/2022, 17:30
The original sterile neutrino explanation to short baseline anomalies is in strong tension with cosmological observations, because of the copious thermalisation of an extra degrees of freedom. However, we show that this will no longer be an issue in the context of the mass-varying sterile neutrino, for which the sterile neutrino production can be greatly suppressed by the time-varying...
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Catarina Cosme28/06/2022, 17:45
In this talk, I will discuss the freeze-in production of Feebly Interacting Massive Particle (FIMP) dark matter candidates through a neutrino portal, in the case where an early matter-dominated era took place for some period between inflation and Big Bang Nucleosynthesis. In this model, we consider a hidden sector comprised of a fermion and a complex scalar, with the lightest one regarded as a...
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Michela Lai (Cagliati State University)28/06/2022, 18:00
According to a wide range of astrophysical observations, about one-fourth of all the energy of the universe is due to "dark matter", a non-relativistic and non-luminous kind of matter, different from ordinary “baryonic" matter. While its present abundance is constrained, its mass and the way it interacts with baryonic matter and with itself is still unknown. A confirmed direct detection in a...
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Nakorn Thongyoi (University of Southampton)
We suggest a new class of models – Fermionic Portal Vector Dark Matter (FPVDM) which extends the Standard Model (SM) with $SU(2)_D$ dark gauge sector. While FPVDM does not require kinetic mixing and Higgs portal. It is based on the Vector-Like (VL) fermionic doublet which couples the dark sector with the SM sector through the Yukawa interaction. The FPVDM model provides a vector Dark...
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Arunansu Sil (IIT Guwahati, India)
We show that the type-I seesaw, responsible for generating the light neutrino mass, itself is capable of accommodating a freeze-in type of dark matter in the form of lightest right-handed neutrino (N1) where the required smallness of the associated coupling is controlled by the lightness of the (smallest) active neutrino mass. It turns out that dark matter is essentially produced from the...
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