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(Seminar) A Portalino to the Twin Sector: Resolving the Cosmological Problem of the Twin Higgs Model
2019-12-30  【】【打印】【关闭

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

 Seminar

Title

题目

 A Portalino to the Twin Sector: Resolving the Cosmological Problem of the Twin Higgs Model

Speaker

报告人

Di Liu

Affiliation

所在单位

New York University

Date

日期

2:00pm, Dec.30,2019

Venue

地点

ITP South Building 6620

Abstract

摘要

Extensions of the Standard Model are often highly constrained by cosmology. The presence of new states can  dramatically alter observed properties of the universe by the presence of additional matter or entropy. However,  the Portalino, a singlet fermion that marries gauge neutral fermion operators, can naturally help provide a portal  for entropy to return to the SM and to lift fermionic degrees of freedom in the Twin Sector. Together with spontaneous  breaking of the Z2 symmetry, there are new opportunities to confront the cosmological challenges of these models.  In this talk, I shall show how one can lift many of the light fields by breaking Z2 with a U(1)Y scalar and its Twin  partner. The introduction of Portalinos can lift the remaining degrees of freedom. We shall find that such models  are highly constrained by precision SM measurements, motivating moderate extensions beyond this. I will discuss  two, one with additional weak matter and another with additional colored matter. The weak model will involve  simple two Higgs doublet models on top of Z2 breaking. The strong model will involve the presence of new leptoquarks  and diquarks.

Contact Person

所内联系人

Jing Shu
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