New Frontiers in Observational Cosmology with Gravitational Waves and Cosmic Microwave Background (GW-CMB 2025)

Contribution List

1. Welcome and Introduction to CHiP

Prof. Yung-Fu Chen (NCU)

06/11/2025, 10:00

2. Introduction to GW-CMB workshop

Masashi Hazumi (National Central University)

06/11/2025, 10:10

4. Simons Observatory and Primordial Gravitational Waves

Prof. Yuji Chinone (KEK)

06/11/2025, 10:20

The cosmic microwave background (CMB) remains one of the most powerful probes of the early universe, providing insights into its composition, geometry, and evolution. While early studies focused on temperature anisotropies, the next frontier lies in precise measurements of CMB polarization. In particular, detecting the curl-like B-mode pattern would provide compelling evidence for primordial...

3. GW Landscape

Yuki Inoue (National Central University)

06/11/2025, 11:20

5. Photos

06/11/2025, 12:20

6. A search for Planet 9

Prof. Tomo Goto (NTHU)

06/11/2025, 14:00

7. Dark matter vs. baryons beyond equilibrium

Prof. Keiichi Umetsu (ASIAA)

06/11/2025, 14:30

8. Dynamical Dark Energy and neutrino masses circa 2025

Dr Shouvik Roy Choudhury (ASIAA)

06/11/2025, 15:00

9. Constraints on amplitude and tilt of the tensor primordial spectrum

Dr Giacomo Galloni (Univ. of Ferrara)

06/11/2025, 16:00

10. Science with Simons Observatory Large Aperture Telescope

Prof. Colin Hill (Columbia Univ.)

07/11/2025, 10:00

11. A Journey through the Full CMB–LSS Tomography: From Milky Way Dust, tSZ, and CIB to CO and [CII] Lines

Dr Yi-Kuan Chiang (ASIAA)

07/11/2025, 11:00

CMB data are maximally projected along the line of sight, with intricate secondary anisotropies that each reveal a distinct chapter of cosmic evolution. In a series of six papers and ongoing, we embark on a deeply data-intensive, cross-correlation redshift tomography of CMB data, analyzing over two billion HEALPix pixels across more than twenty diffuse sky maps (e.g., Planck, IRAS, Herschel)...

12. Extracting parity-violating gravitational waves from the large-scale structure of the universe

Prof. Teppei Okumura (ASIAA)

07/11/2025, 11:30

16. Universal redshifted black hole quasinormal modes induced by environments

Dr Che-Yu Chen (RIKEN)

07/11/2025, 12:00

The ringdown phase of gravitational waves emitted by a perturbed black hole is described by a superposition of exponentially decaying sinusoidal modes, called quasinormal modes (QNMs), whose spectra depend only on the property of the black-hole geometry. The extraction of QNM frequencies of an isolated black hole thus allows for testing GR, the so-called black hole spectroscopy program....

13. New Results from LIGO

Dr Daiki Tanabe (ASIoP)

07/11/2025, 14:00

14. Monodromy Approach to Quasi-Normal Modes of Black Holes

Dr Viona Wei (NCU)

07/11/2025, 15:00

The quasi-normal modes (QNMs) are the oscillation modes of black holes. This kind of mode will be interesting when we study the ringdown of gravitational waves. In theoretical conception, the highly damped frequencies of QNMs would show quantum phenomena such as Bohr’s hydrogen atom model. One of the analyzing methods is called “Monodromy” which is more precise to solve the highly damped...

15. Circular Polarization and Doppler-Induced Dipole Anisotropies in the Stochastic Gravitational-Wave Background

Sevgi Karadağ (ASIoP)

07/11/2025, 16:00

Some inflationary models predict a circularly polarized stochastic gravitational-wave background (SGWB) with potential cosmological significance. We develop a simulation and parameter-estimation framework to characterize circular polarization and Doppler-induced dipole anisotropies in the SGWB. The pipeline jointly constrains the polarization degree (Π), energy density (Ω_GW), and dipole...

17. Final discussion

07/11/2025, 16:30