CTPU-KNU Workshop on Particles, Gravitation and Cosmology

6 Apr 2023, 09:00 → 8 Apr 2023, 18:00 Asia/Seoul

Room 308, Du-dream center (Kunsan National University)

Kiwoon Choi (IBS-CTPU), Sang Pyo KIM (Kunsan National University), Sanghyeon Chang (IBS-CTPU), Tae Hyun Jung (IBS CTPU)

CTPU-KNU Workshop on Particles, Gravitation and Cosmology is a collaboration meeting between the Center for Theoretical Physics of the Universe (CTPU) at Institute for Basic Science (IBS) and the Physics department of Kunsan National University. Various topics in particle physics, string theory, and cosmology will be discussed during the workshop. 

 

Topics

• Physics Beyond the Standard Model
• Dark Matter 
• String Theory and Fields
• Gravitation
• Astroparticle Physics and Cosmology

 

 

Invited speakers 

• Christian Schubert
• Gungwon Gang
• Boegun Gwak
• Chul Min Kim
• KeunYoung Kim
• Seong Chan Park
• Seodong Shin

 

 

Venue

Kunsan National University  (location)

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Sponsored by

 

 

 

 

Thursday, 6 April

13:30 → 15:00 Session 1

13:30 Junichiro Kawamura

14:00 Mehedi Masud

14:30 Adil Jueid

16:00 → 17:00 session 2

16:00 Takahiro Terada

16:30 Junsei Tokuda

Friday, 7 April

09:00 → 10:00 colloquium

09:00 Christian Schubert - An Overview of the Worldline Formalism

Title: An Overview of the Worldline Formalism

Abstract: I will give a short review of the worldline formalism, with an emphasis on recent developments.
In Part 1 I will first discuss the basics of the formalism for the prototypical case of quantum electrodynamics.
Nonabelian gauge theory will be treated next, including Ball-Chiu form factors and recent applications to Berends-Giele currents and color-kinematics duality. The extension to other standard model couplings will be shortly presented, using the examples of axion and Higgs decay into two photons.
Part 2 will be devoted to gravity and curved space. Here I will discuss both the worldline approach and the string-based formalism of Bern-Dunbar-Shimada. Finally, I will also give a short introduction to the closely related worldline approach to classical black hole scattering.

11:00 → 12:00 Session 1

11:00 Tae Hyun Jung

11:30 Jong-Wan Lee

14:00 → 15:00 session 2

14:00 Seong Chan Park - Festina-Lente bound, Higgs vacuum structure and more

Title: Festina-Lente bound, Higgs vacuum structure and more

Abstract: The recently suggested Festina-Lente (FL) bound provides a lower bound on the masses of U(1) charged particles in terms of the positive vacuum energy. Since the charged particle masses in the Standard Model (SM) are generated by the Higgs mechanism, the FL bound provides a testbed of consistent Higgs potentials in the current dark energy-dominated universe as well as during inflation. We study the implications of the FL bound on the UV behavior of the Higgs potential for a miniscule vacuum energy, as in the current universe.

14:30 Seodong Shin - Manifesting hidden dynamics of a sub-component dark matter

Title: Manifesting hidden dynamics of a sub-component dark matter

Abstract: 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, it can be easier to detect the sub-component with smaller abundance fractions in direct/indirect-detection experiments and cosmological observations.

16:00 → 17:30 session 3

16:00 Miok Park

16:30 Chul Min Kim - All-optical Demonstration of Nonlinear Compton Scattering: QED of Strong Fields

All-optical Demonstration of Nonlinear Compton Scattering: QED of Strong Fields

17:00 Boegun Gwak

Saturday, 8 April

09:00 → 10:30 Session 1

09:00 Pablo Soler

09:30 Keun Young Kim - Comments on quantum chaos and complexity

Title: Comments on quantum chaos and complexity

10:00 Boris Latosh

11:00 → 12:00 session 2

11:00 Gungwon Gang - Numerical studies for black hole encounters

Title: Numerical studies for black hole encounters

Abstract: Black hole binary mergers have been playing an important role in exploring a new world seen by gravitational waves. Gravitational wave events from non-circular mergers or black hole encounters in general are expected to be observed as the sensitivity of current detectors are improved at low frequencies. In this talk, we present some of the main results in numerical studies for dynamical black hole captures, highly eccentric encounters and extremly close encounters of two black holes.

11:30 Chan Park