Prof. Toshifumi Futamase 二間瀬 敏史 (Tohoku University 日本東北大學)
"Is the Universe Inhomogeneous?
Possible Interpretation of recent DESI Observational Results"
Time/Location： 2026-12-08 14:00 [S4-1013]
Abstract：
The time evolution of the Hubble parameter, derived from Baryon Acoustic
Oscillation (BAO) observations by the Dark Energy Spectroscopic Instrument
(DESI) contradicts the predictions of the standard cosmological model
(which assumes a homogeneous, isotropic universe with a cosmological
constant). This discrepancy, combined with the long-standing (decade-old)
tension between Hubble constant values (the current Hubble
parameter) derived from supernova observations and those inferred from the
Cosmic Microwave Background (CMB), strongly suggests that our
understanding of cosmology remains incomplete.
In this talk, I will begin by covering the fundamentals of standard
cosmology, explain the "Hubble tension," and discuss DESI and BAO, before
detailing this discrepancy. While one proposed interpretation involves a
time-varying dark energy (rather than a cosmological constant), this talk
will explore an alternative possibility—based on our recent
research—that the discrepancy arises from large-scale inhomogeneity
in the universe.
| Date | Speaker | Title |
|---|
| 2026-12-08 | Prof. Toshifumi Futamase 二間瀬 敏史
(Tohoku University 日本東北大學) | Is the Universe Inhomogeneous?
Possible Interpretation of recent DESI Observational Results |
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| 2023-08-07 | Dr. Edward Lin 林省文博士
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| 2018-12-28 | Dr. Loren C. Chang
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| 2018-12-21 | Professor Yue Shen
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| 2018-12-14 | Dr. Yuki Inoue
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| 2018-12-07 | Dr. Yu-Jung Chen
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| 2018-11-13 | Dr. David Jewitt
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| 2018-11-09 | Dr. Ying-Tung Chen
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| 2018-10-26 | Prof. Wen-Ping Chen
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| 2018-10-19 | Prof. Yuan-Hann Chang
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| 2018-10-12 | Dr. Robin Thor
(Max Planck Institute for Solar System Research) | Constraints on planetary interiors from laser altimetry |
| 2018-10-12 | Dr. Chi-Ju Wu
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| 2018-09-28 | Dr. Po-Chieh Yu
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