2026 天文年會 (ASROC Annual Meeting)

Session

Poster - Cosmology

Not scheduled

College of Hakka Studies at NYCU, Zhubei, Hsinchu County 國立陽明交通大學客家學院(竹北六家校區)

95. A discussion On the Possibility of Atomic Gravitational Contraction

te chun wang (retired teacher)

Poster

Starting from the relative description between expansion and contraction of space and matter, an atomic gravitational contraction picture is discussed on the possibility of interpreting the cosmic red-shift, instead of the current theory of the space expansion described by the Hubble's law. A contraction factor has been pointed out to compare with the current value of Hubble constant.
As...

38. Constraining Cosmological Baryons with Fast Radio Bursts Using Hα-based Host Subtraction

Mr Chakrapani Reddy (National Chung Hsing University)

Poster

The distribution of cosmological baryons remains incompletely understood despite recent progress using fast radio bursts (FRBs). Dispersion measures (DM) trace the integrated ionized baryon content along the line of sight, but uncertainties in the host-galaxy contribution ($\mathrm{DM}_{\rm host}$) limit the statistical significance of correlations between intergalactic DM and large-scale...

71. Constraining the Hubble Constant with Fast Radio Bursts through Probabilistic Host Association

Wen-Miao Kuo (National Changhua University of Education)

Poster

Measuring the expansion rate of the Universe, quantified by the Hubble constant (H₀), is an important problem in modern cosmology. In this study, we aim to estimate the Hubble constant by using fast radio bursts (FRBs) detected with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) radio telescope. Current measurements show a significant discrepancy between early-Universe probes, such...

56. Estimating the Hubble Constant from Localized and Non-localized Fast Radio Bursts Using CHIME/FRB Catalog 2

YaLi Chu (IoA)

Poster

The Hubble constant (H₀) characterizes the present-day expansion rate of the universe. However, despite the significant decrease in measurement uncertainties, a discrepancy of more than 4𝜎, known as the Hubble tension, exists between measurements from the Cosmic Microwave Background (CMB), which yields H₀ = 67.66 ± 0.42 km s⁻¹ Mpc⁻¹ under the ΛCDM model, and Cepheid-calibrated Type Ia...

99. Testing cosmological isotropy with gravitational waves and gamma-ray bursts

Hiu Yeung Cheng (Department of Physics, The Chinese University of Hong Kong)

Poster

The cosmological principle asserts that the Universe is statistically isotropic on large scales, while alternative cosmological models can produce anisotropic signatures. Recent studies have suggested tantalising hints of anisotropies in supernova Ia, cosmic microwave background, and gamma-ray burst data, though these remain unconfirmed. We test for cosmological anisotropies using the latest...

45. The Altered Chaplygin Model as a Model for Dark Energy

Chuan-Jui Li (NCCU)

Poster

We present a scalar‐field formulation of the generalized Chaplygin gas (GCG) and modified Chaplygin gas (MCG) models, in which the cosmic fluid dynamics are reproduced by canonical Lagrangians with analytically derived energy density $\rho(\phi)$, pressure $p(\phi)$, and scalar potential $V(\phi)$. This framework provides a unified description of dark matter and dark energy, transitioning...