ashiday

芦田良貴（アーティスト名：Ashiday）は、デジタルアーティストです。ありふれた対象に潜む神秘性を描くデジタル版画を制作し、東京都美術館・上野の森美術館・金沢21世紀美術館のほか、ニューヨーク・上海・モントルーの国際アートフェアに出展。また、宇宙物理学の研究者として論文を

[ashiday @ashiday]

For many years, I have been fascinated by the lingering puzzles surrounding cosmic acceleration—particularly the question of why the expansion of the universe appears to accelerate rather than decelerate.

While reflecting on this question, an intriguing thought experiment came to mind: What if the universe could be visualized as a static, spherically symmetric spacetime with a sparse center and an increasingly dense periphery, reminiscent of M. C. Escher’s Circle Limit series? In my own notes, I have tentatively called this the "Escher Model."

Within this conceptual framework, redshift could be interpreted as arising from gravitational potential gradients rather than from physical spatial expansion. This might offer an alternative, exploratory perspective on cosmic acceleration that does not necessarily rely on dark energy, as well as an alternative context for the cosmic microwave background.

In such a geometry, an internal observer measures this universe as an infinite and boundary-free space, whereas an outside observer would see it as a bounded finite sphere. However, strictly speaking, we can explore the physics of the interior, but the "outside" remains inherently unobservable for an internal observer. As Ludwig Wittgenstein famously wrote, "Whereof one cannot speak, thereof one must be silent". We have neither metrics, physical constants, nor clocks to meaningfully characterize an external realm.

I wish to emphasize that I do not claim the standard expanding universe paradigm is wrong, nor do I claim that this Escher-inspired model is a proven alternative. I deeply respect the achievements of modern cosmology and remain open to many frameworks, including the multiverse of quantum cosmology.

My sincere intention is to share this thought experiment as an open invitation for constructive discussion. I wonder whether exploring the interplay between conventional expansion theories and this geometric perspective could help us better understand future observational data. My thoughts continue to evolve every day, and I would be truly grateful to learn from your insights and explore these fundamental questions together.

10.5281/zenodo.21868831
https://t.co/TvP5FfGGSm

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【特別寄稿】 愛は命の輝き～ 『通電ショック洗脳実験』に寄せて 切通理作 - 高品質SM動画のDL販売サイト|Dogma×Web(ドグマウェブ) https://t.co/EwLtp3mXFI

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https://t.co/j59lRdLQjo

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Polish Exhibition 2024にて
https://t.co/nVeWhhpHXj

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@otamusume メリークリスマス🎄✨

[yutti@写真家 @otamusume]

素敵な贈り物🎁
(*´罒`*ゞあざます♪

@fRZU74Qi49N19v1

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@RITA_GOLDIE @fan_lounge @pani4_tomo @slave_of_whale @edacodx @Eda_Yasutaka 面白そう❣️

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@onikohshi 僕が使うとインスタと大して違わない使い方しか出来ない😖💦

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@otamusume かわいい💞

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@otamusume お大事にしてください。

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@eidlogatir 抱き合えば体温の差を中和してくれます。

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@s_y_Singer これは一概に福井アナを責めることはできないんじゃないかな🤔もう少しフィリピン語に忠実な表記はできなかったのか❓

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@s_y_Singer 正しい

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@ebisuhidesan 僕が都知事だったら１万床を擁する感染症専門病棟を建設し少数常勤の専門医の指揮の下に輪番制で勤務する非常勤医師の体制を構築する。これによって院内感染を防ぎ一般病院の負担を大幅に軽減するだけでなく輪番で派遣された医師が感染症専門病棟で身につけた知見が帰還してからも大いに力を発揮する。

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@gotymusic @RITA_GOLDIE おめでとうございます🎂🎉✨

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@SWC97514522 当然の結果です。

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@vivi_gato 宮沢賢治の「北守将軍と三人兄弟の医者」ですね。

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@yajipoi0810 小気味いい😆

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@ebisuhidesan 今はいないけど、必要に迫られれば、そういう人は必ず出て来ると思います。

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@vivi_gato もうすぐ春ですね🌸✨