Workshop on Higgs and Cosmology connection: Yonsei-APCTP-France-Korea Star collaboration project

11 Dec 2022, 17:00 → 17 Dec 2022, 15:00 Asia/Seoul

Science Hall #327

Seong Chan Park (Yonsei University)

Workshop on Higgs and Cosmology connection: Yonsei-APCTP-France-Korea Star collaboration project

- Place: Yonsei University, Science Hall #327

- Date: 12/11 - 12/17 (Sun~Sat) 

 

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Invited speakers

• Aldo Deandrea (Lyon, France)

• Benjamin Fuks (Sorbonne, France) 

• Donghui Jeong (Penn State Univ., USA) 

• Yongsoo Jho (Weizmann, Israel) 

• Jay Hyun Jo (Brookhaven National Lab., USA)

• Sunghoon Jung (Seoul National University, Korea)

• Jinsu Kim (Tongji Univ., China)

• Tae Jeong Kim (CMS, Hanyang University, Korea) 

• Taysun Kimm (Yonsei University, Korea)

• Chan Beom Park (Chonnam Nat'l Univ., Korea) 

• Eunil Won (Korea Univ., Korea)

• Haibo Yu (UC Riverside, USA)

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Sunday, 11 December

17:00 → 19:00 Registration

Monday, 12 December

14:00 → 16:40 Session: 1

14:00 Revealing the local cosmic web from galaxies by Deep Learning

The 80% of the matter in the Universe is in the form of dark matter that comprises the skeleton of the large-scale structure called the Cosmic Web. As the Cosmic Web dictates the motion of all matter in galaxies and inter-galactic media through gravity, knowing the distribution of dark matter is essential for studying the large-scale structure. However, the Cosmic Web's detailed structure is unknown because it is dominated by dark matter and warm-hot inter-galactic media, both of which are hard to trace. Here we show that we can reconstruct the Cosmic Web from the galaxy distribution using the convolutional-neural-network-based deep-learning algorithm. We find the mapping between the position and velocity of galaxies and the Cosmic Web using the results of the state-of-the-art cosmological galaxy simulations, Illustris-TNG. We confirm the mapping by applying it to the EAGLE simulation. Finally, using the local galaxy sample from Cosmicflows-3, we find the dark-matter map in the local Universe. We anticipate that the local dark-matter map will illuminate the studies of the nature of dark matter and the formation and evolution of the Local Group. High-resolution simulations and precise distance measurements to local galaxies will improve the accuracy of the dark-matter map.

Speaker: Donghui Jeong

14:40 Coffee Break

15:00 A new mechanism for symmetry breaking from nilmanifolds

Speaker: Aldo Deandrea

Deandrea-Yonsei22-nilmanifold.pdf

15:40 Coffee Break

Tuesday, 13 December

10:00 → 12:00 Session: 2

10:00 Baryonic solutions to dark matter problems in dwarf galaxies

It has been argued that the number density and matter distribution in the local dwarf galaxies pose a real challenge to the cold dark matter scenario. However, it is not yet clear how visible matter evolves and shapes the distribution of dark matter, potentially limiting the use of dwarf galaxies as a testbed. In this talk, I will give a brief overview of the well-known missing satellite and cusp-core problems in dwarf galaxies and discuss baryonic processes as a potential solution.

Speaker: Taysun Kimm

10:40 Coffee Break

11:00 Cosmology with polarized CMB: GroundBIRD telescope

The standard, a spatially-flat six-parameter model of the universe, having a cosmological constant and dark matter as dominant forms of the energy density in the universe at present, agrees remarkably well with observational data to date. Along with it, a model of rapid accelerated expansion of the very early universe predicts distinct polarized patterns in CMB. In this presentation, we discuss observational cosmology with polarized CMB through the GroundBIRD telescope.

Speaker: Eunil Won

11:40 Coffee Break

14:00 → 16:00 Session: 3

14:00 KCMS and some updates from the LHC

Speaker: Hwidong YOO (Yonsei University)

HDYOO_YUworkshop_12132022.pdf

14:40 Coffee Break

15:00 New approaches to semi-invisible tau and B decays

New particles in the MeV-GeV range produced at colliders and escaping detection can be searched for at operating B and tau factories such as Belle II. A typical search channel involves pair-produced taus (or mesons), one of which decaying to invisible particle(s), and the other providing a tag. One crucial impediment of these searches is the limited ability to reconstruct the parents' separate boosts. This is the case in the typical topology where both decay branches include invisible particles. We observe that such topology lends itself to the use of kinematic variables such as M2, designed for pairwise decays to visible plus invisible particles. Starting from this observation, we construct several kinematic quantities able to discriminate signal from background and apply them to some benchmark searches in tau and B decays.

Speaker: Chan Beom Park

yonsei_202212_cbpark.pdf

15:40 Coffee Break

17:00 → 19:00 Conference dinner

Wednesday, 14 December

10:00 → 12:00 Session: 4

10:00 Composite dark matter: simplified models, non-minimality and overlooked channels

Speaker: Benjamin Fuks

fuks_yonsei.pdf

10:40 Coffee Break

11:00 Astrophysical Probes of Dark Matter

I will give an overview on astrophysical probes of dark matter, which seek to determine fundamental properties of dark matter through observations of galaxies. In particular, I will discuss implications of strong dark matter self-interactions on cosmic structure formation and observational tests for such a scenario.

Speaker: Haibo Yu

11:40 Coffee Break

12:00 → 17:00 Excursion

17:00 → 18:00 Special Colloquium

Speaker: Donghui Jeong (Penn State University)

18:30 → 20:30 Banquet

Thursday, 15 December

10:00 → 12:00 Session: 5

10:00 Probing sub-parsec scale matter power spectrum with diffractive lensing of gravitational waves

Gravitational waves (GW) radiated by compact binary coalescences can be diffracted by astrophysical-size objects due to long wavelength.
This is so called diffractive lensing. The length scale of the diffraction is determined by the geometric mean of GW wave length and the effective distance to lens, and it becomes O(1 pc) assuming GW frequency ~ 1Hz and the distance to lens ~ 1 Gpc. Therefore, diffractive lensing phenomena can be used to probe cosmological structures around parsec length scales assuming proper GW sources and detectors. I'll show the prospect for probing very light dark matter (sub-) halo with this phenomena. Furthermore, I will discuss how can we constrain sub-parsec matter power spectrum even when we can not detect single diffractive lensing event.

Speaker: Han Gil Choi

10:40 Coffee Break

11:00 Searching for nu-physics: Overview of Experimental Neutrino Physics

Neutrinos are the most elusive fundamental constituents of matter. And yet these particles may hold the keys to exotic new phenomena, which transcend our Standard Model of particle physics. In the last several decades neutrino experiments have given us a consistent picture of neutrino mass and mixing among three neutrino flavors. However, fundamental questions about the nature of the neutrino and matter itself remain unanswered. In order to probe these questions, various neutrino experiments with different objectives are currently under operation or being planned. In this talk, I will give an overview of the status and recent progress of the experimental neutrino physics.

Speaker: Jay Hyun Jo

20221215_JHJ_HiggsCosmologyWorkshop_NuExpOverview.pdf

11:40 Coffee Break

14:00 → 17:20 Session: 6

14:00 PBHs and GWs from a Supersymmetric Higgs Inflation (online)

I discuss the possibility of curvature perturbation enhancement in a supersymmetric version of the nonminimally-coupled Higgs inflation model. The large curvature perturbation not only leads to the formation of primordial black holes, but it also sources gravitational waves. Focusing on the two-field case, I present the parameter region where the produced primordial black holes may account for the whole dark matter abundance today. Finally, the detectability of the gravitational waves is discussed. The talk is based on 2209.15343.

Speaker: Jinsu Kim

14:30 Lepton-flavor-violating light new physics search at rare muon decays (online)

We study the sensitivity of the existing MEG data to lepton flavor violating axion-like particles produced through μ→eaγ and estimate the discovery potential for the upcoming MEG II experiment in this channel. The MEG II signal efficiency can be improved significantly if a new trigger can be implemented in a dedicated run with a reduced beam intensity. This search would establish the world leading measurement in this channel with only 1 month of data taking.

Speaker: Yongsoo Jho

15:00 Lepton portal dark matter at future electron-positron and muon colliders

In this talk, I discuss the phenomenology of a minimal lepton portal dark matter at high-energy electron-positron and muon colliders. The model consists of two extra gauge singlets: a charged scalar singlet and a right-handed Majorana fermion. The latter plays the role of a dark-matter candidate. After discussing the impact of all the existing theoretical and experimental constraints on the model parameter space, I illustrate the phenomenological implications at future colliders.

Speaker: Adil Jueid

talk_AJ_151222.pdf

15:30 Coffee Break

16:00 Tri-Higgs to distinguish the high- and low-cutoff scales

Speaker: Jeonghyeon Song

Friday, 16 December

10:00 → 12:00 Session: 7

10:00 Primordial Black Holes: New Particle Factories! (online)

Speaker: Jong-Chul Park

10:40 Coffee Break

11:00 Higgstrahlung, dark photons, and invisible particles at Belle & Belle II

In this talk, we present recent studies of semi-invisible final states of various processes in the Belle and Belle II experiments. In particular, we cover the following results: lepto-philic Z' decays to invisible final states and dark photon search in the dark-Higgsstrahlung process, both in the e+ e- continuum, search for invisible baryon-like dark matter particle in the B-mesogenesis scheme, search for invisible particle in tau decays, and search for heavy neutral lepton in tau decays.

Speaker: Prof. Youngjoon Kwon (Yonsei University)

HiggsCosmo_Belle2_Y.Kwon_v.1.1.pdf

11:40 Coffee Break

14:00 → 16:00 Session: Round Table on BSM

Convener: Seong Chan Park & P. Ko

14:00 Round Table on BSM

Speaker: Aldo Deandrea (Lyon, France) Benjamin Fuks (Sorbonne, France) Donghui Jeong (Penn State Univ., USA) Yongsoo Jho (Weizmann, Israel) Jay Hyun Jo (Brookhaven National Lab., USA) Sunghoon Jung (Seoul National University, Korea) Jinsu Kim (Tongji Univ., China) Tae Jeong Kim (CMS, Hanyang University, Korea) Taysun Kimm (Yonsei University, Korea) Chan Beom Park (Chonnam Nat'l Univ., Korea) Eunil Won (Korea Univ., Korea) Haibo Yu (UC Riverside, USA)

Saturday, 17 December

10:00 → 12:00 Session: Collaboration Meeting