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Workshop on Physics of Dark Cosmos: dark matter, dark energy, and all

21-23 October 2022
Lavalse Hotel Busan 2F
Asia/Seoul timezone

Contribution List

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34. Some thoughts on natural models for inflation
Prof. Hyun Min Lee
21/10/2022, 15:30

We present some of the recent developments on natural models for inflation, with a focus on Higgs inflation and hybrid inflation with a pseudo-scalar field. Implications of new symmetry/particles in each of scenarios will be discussed.
35. Reheating and Dark Matter Freeze-in in the Higgs-R2 Inflation Model
Dr Shuntaro Aoki
21/10/2022, 16:00

The Higgs inflation perfectly agrees with the CMB observation, but suffers from a unitarity problem due to a large non-minimal coupling of Higgs field to the Ricci scalar. Recently, it has been shown that introducing a Ricci square term (R2 term) in the Higgs inflation can solve this problem. In this talk, we discuss the post-inflationary dynamics for reheating and freeze-in dark matter in the...
33. Quintessential axion
Prof. Jihn E. Kim
21/10/2022, 16:30

I will talk on quintessential axions.
37. Flavor anomalies and other highlights from Belle and Belle II
Prof. Youngjoon Kwon (Yonsei University)
21/10/2022, 19:00

In this talk, we present recent highlights from the Belle and Belle II experiments, focusing on the latest progress on flavor anomalies. We also discuss selected results on searches for dark sector from both experiments, including the B and D meson decays to invisible and semi-invisible decays.
38. Riemannian Data preprocessing in Machine Learning to focus on QCD color structure
Prof. Myeonghun Park
21/10/2022, 19:30

We provide a simple but a novel data preprocessing method using a Riemann sphere to utilize a full phase space by decorrelating QCD structure from a kinematics. We can achieve a statistical stability by enlarging the size of testable data set with focusing on QCD structure effectively
39. Constraining ALPs from PBH with time-varying decay process
Tae Geun Kim
21/10/2022, 20:00

Axion-like particles (ALPs) are one of the well-known particles beyond the standard model, so understanding its properties and interactions with standard model particles is important. In this study, we constrain the mass ($m_a$) and the photon coupling constant ($g_{a\gamma\gamma}$) of ALPs through light particle emission from primordial black holes (PBHs). To achieve this, we focus on the...
40. Sterile Neutrino Dark Matter with PTOLEMY-like Experiment
Erdenebulgan Lkhagvadorj
21/10/2022, 20:15

We study the detection prospect of the cosmic background of sterile neutrinos in PTOLEMY-like experiments. The sterile neutrino with mass ranges between sub-eV - 10 keV may contribute to the local number density of dark matter candidates. While, in the literature, 100% of the sterile neutrino dark matter was assumed, however we assume that sterile neutrino could be sub-component of dark...
41. Unifying flavor and Dark Matter puzzles with SU(2)D lepton portals
Adriana Guerrero Menkara
21/10/2022, 20:30

We propose a novel model for lepton flavor and dark matter based on an SU(2)D gauge symmetry and vector-like leptons in their fundamental representations. We introduce a dark SU(2)D Higgs doublet and a Higgs bi-doublet for the mass mixing between the vector-like lepton and the lepton, leading to small seesaw lepton masses. The SU(2)D gauge bosons and the vector-like lepton contribute to the...
42. Models for Self-resonant Dark Matter
Seongsik Kim
21/10/2022, 20:45

We consider a new mechanism for enhancing the self-scattering and annihilation cross sections for dark matter with multiple components but without a light mediator. The lighter dark matter component plays a role of the u-channel pole in the elastic co- scattering for dark matter, leading to a large self-scattering cross section and a Som- merfeld enhancement for semi-annihilation processes....
43. On the WIMP dark matter signature in old neutron stars
Prof. Natsumi Nagata
22/10/2022, 09:30

Weakly Interacting Massive Particles (WIMPs) in the Universe accumulate in neutron stars (NSs) through their interactions with ordinary matter, and their annihilation inside the NS core causes late-time heating. It has been argued that this heating effect maintains the surface temperature of old NSs to be a few thousand K, which can be regarded as a smoking gun signature of dark matter (DM)...
44. Dark matter signals from charged mesons in neutrino experiments
Dr Doojin Kim
22/10/2022, 10:00

Neutral mesons such as pi0 and eta have played a role of an important source of dark sector particles including dark matter in the beam-dump type and neutrino experiments. We point out that charged mesons are another important but overlooked source of dark sector particles especially in the beam-focused neutrino experiments. The idea is that a charged meson decays to a charged lepton, a...
45. Cosmic-ray-induced Boosted Dark Matter
Prof. Jong-Chul Park
22/10/2022, 11:00

In this talk, we review boosted dark matter (BDM) production mechanisms via extended dark sectors and charged cosmic rays. Next, we propose a novel dark-matter boosting mechanism by cosmic-ray neutrinos. The new mechanism is so significant that the arriving flux of cosmic-ray neutrino BDM (νBDM) lighter than O(1-10) MeV on Earth is substantially larger than the one of the cosmic-ray electron...
46. Manifesting hidden dynamics of a sub-component dark matter
Prof. Seodong Shin
22/10/2022, 11:30

A distinctive cosmological dynamics of a sub-component dark matter will be discussed. The thermal evolution of the sub-component is significantly affected by the sizable self-scattering and the required annihilation cross section of the sub-component sharply increases as we consider a smaller relative abundance fraction among the dark-matter species. Therefore, contrary to a naive expectation,...
47. Detecting axion dark matter with chiral magnetic effects
Prof. Sang Hui Im
22/10/2022, 12:00

We show that dark matter axions or axion-like particles (ALP) induce non-dissipative alternating electric currents in conductors along the external magnetic fields due to the axial anomaly, realizing the chiral magnetic effects. We propose a new experiment to measure this current to detect the dark matter axions or ALP. This non-dissipative currents are the electron medium effects, directly...
48. Positivity bounds for scalar dark matter
Dr Kimiko Yamashita
22/10/2022, 16:00

We study the positivity bounds implication on dimension-8 Higgs-portal dark matter production in the early universe. The relevant operators are subject to satisfying positivity bounds when the UV physics follows the S-matrix based on the fundamental pillars of quantum field theory. We present how positivity bounds limit the model parameter space of dark matter production and show the interplay...
49. An Asymmetric SIMP Dark Matter Model
Dr Shu-Yu Ho
22/10/2022, 16:30

In this talk, we will show for the first time an asymmetric strongly interacting massive particles (SIMP) dark matter (DM) model, where a new vector-like fermion and a new complex scalar both having nonzero chemical potentials can be asymmetric DM particles. After the spontaneous breaking of a U(1)𝖣 dark gauge symmetry, these two particles can have accidental ℤ4 charges making them stable. By...
51. Positronium decays with a dark Z and fermionic dark matter
Dr Dong-Won Jung
22/10/2022, 17:00

We investigate the invisible decay of positronium to probe the fermionic light dark matter mediated by the dark Z boson. The invisible decay rate of positronium through weak interaction in the standard model is too small to be detected in the experiment. We show that it can be enhanced to be observed in the future if the dark matter is lighter than the electron in the dark Z model. We also...
36. Cosmology in a SUSY B-L model
Prof. Wan-Il Park
22/10/2022, 17:30

I will discuss some cosmological implications of a SUSY B-L model, including dark matter and gravitational waves
64. FIMP dark matter from a hidden effective supersymmetric theory
Isnard Wanda
22/10/2022, 20:00

In this study, we present a dark matter model relying on hidden supersymmetric sectors such that dark matter particles are then decoupled from the SM. We will consider dark matter as massive bound states of gluons and gluinos called glueballs and gluinoballs. We will discuss the possibility to produce such dark matter particles with a freeze-in mechanism.
52. Revisit the gravitational lensing effect using radio wave polarization
Youngsub Yoon
22/10/2022, 20:15

Gravitational lensing effect analysis allows us to find the matter distribution in galactic clusters. For example, such an analysis at the Bullet Cluster suggested convincingly in favor of the existence of dark matter. However, in this analysis, it was assumed that the average of the original orientation of galaxies in a small patch of sky is zero. While this assumption is reasonable, it can...
53. Non-minimally assisted chaotic inflation
Sang Chul Hyun
22/10/2022, 20:30

Conventional wisdom says that a chaotic inflation model with a power-law potential is ruled out by the recent Planck-BICEP/Keck results. We find, however, that the model can be assisted by a non-minimally coupled scalar field and still provides a successful inflation. Considering a power-law chaotic inflation model of the type $V \sim \varphi^n$ with $n$ = {2, 4/3, 1, 2/3, 1/3}, we show that...
54. Primordial Black Holes and Gravitational Waves from the Tachyonic Instability in Higgs-$R^2$ Inflation
Dhong Yeon Cheong
22/10/2022, 20:45

The running of the Higgs self coupling may lead to numerous phenomena in early universe cosmology. In this paper we introduce a scenario where the Higgs running induces turns in the trajectory passing a region with tachyonic mass, leading to a temporal tachyonic growth in the curvature power spectrum. This effect induced by the Higgs leaves phenomena in the form of primordial black holes and...
57. New Particle Searches at Yemilab Large Neutrino Detector
Prof. Sunny Seo
23/10/2022, 09:30

In thisIn this talk, I will introduce Yemilab, 1st deep underground laboratory dedicated to science in Korea, and present new particle searches using a large neutrino detector to be proposed at the Yemilab.
56. Neutrino transition in dark matter
Prof. Eung Jin Chun
23/10/2022, 10:00

An ultralight dark matter may have interesting implications in neutrino physics which have been studied actively in recent years. There can occur yet unexplored medium effect of neutrino transition which must be taken into account when describing the oscillations of neutrinos propagating through dark matter. Strong constraints on the model parameters are obtained considering the solar neutrino...
55. Probing the non-standard neutrino interactions using quantum statistics
Prof. Choong Sun Kim
23/10/2022, 11:00

I will talk on BSM neutrino interactions, which can be probed by quantum statistics.
58. Solar neutrinos and future experiments
Dr Pouya Bakhti
23/10/2022, 11:30

In this talk, we review the production of solar neutrinos and their propagation within the Sun and the Earth. The LMA-MSW solution explains the flavor change of solar neutrinos. However, there are some tensions between the data and predictions. In order to resolve these tensions, new physics such as Non-Standard neutrino Interaction (NSI) or the presence of a new sterile neutrino are proposed....
59. Non-Standard Interaction of atmospheric neutrino in future experiments
Dr Meshkat Rajaee
23/10/2022, 12:00

We discuss the prospects of probing neutral-current non-standard interaction (NSI) in the propagation of atmospheric neutrinos in future large-volume neutrino experiments including DUNE, HK, KNO, and ORCA. For DUNE, we utilize its ability of identifying the tau neutrino event and combine the $\nu_\tau$ appearance with the $\nu_\mu$ disappearance. Based on our simulated results, the ten years...
62. All the covariant tensor currents of massless particles in the covariant formulation
Dr JaeHoon Jeong
23/10/2022, 14:00

We present an efficient algorithm for constructing all the covariant tensor currents of massless particles of arbitrary spins in the covariant formulation. This algorithm enables us to construct all the matrix elements as well as covariant three-point vertices simply by assembling the basic building blocks,
leading to the direct construction of tensor currents. We revisit the restrictions...
61. Trouble with geodesics in black-to-white hole bouncing scenarios
Dr Wei-Chen Lin
23/10/2022, 14:30

By utilizing the thin shell approximation, we investigate the behavior of radial timelike geodesics in a black hole to white hole bouncing scenario with a mass (de-)amplification relation. We show that those geodesics lose energy after crossing the transition surface if the white hole mass is less than the black hole mass and vice versa. That is, the bounded timelike radial geodesics become...
60. Hartle-Hawking wave function beyond the instanton approach
Prof. Dong-han Yeom
23/10/2022, 15:00

We discuss the no-boundary wave function by numerically solving the Wheeler-DeWitt equation. We report some interesting new observations.
65. Discussion on various topics in Dark Cosmos, and final remark
Seong Chan Park (Yonsei University)
23/10/2022, 15:30
63. Phenomenology of Wess-Zumino-Witten action
Prof. Seong Chan Park
BSM

We will consider an anomalous U(1) theory having a counter term in the form of WZW. Various phenomenological implications are carefully examined.
50. TBA
Dr Neil Barrie

TBA
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