Microlensing Signatures Of Dyson Sphere-like Structures Around Primordial Black Holes As Technosignatures Of Extraterrestrial Advanced Civilizations

We investigate the microlensing detectability of extraterrestrial technosignatures originating from Dyson sphere – like structures, such as Dyson Swarms surrounding primordial black holes (PBHs).

These hypothetical swarms consist of stochastically varying, partially opaque structures that could modulate standard microlensing light curves through time-dependent transmission effects.

We introduce a probabilistic framework that includes a stochastic transmission model governed by variable optical depth and random gap distributions. We perform a parameter scan and generate heatmaps of the optical transit duration. We study the infrared excess radiation and peak emission wavelength as complementary observational signatures.

Additionally, we define and analyze the effective optical depth and the anomalous microlensing event rate for these stochastic structures. Our findings provide a new avenue for searching for extraterrestrial advanced civilizations by extending microlensing studies to include artificial, dynamic modulation signatures.

Shant Baghram

Comments: 9 pages, 7 figures, 1 table. Accepted for publication in the Astrophysical Journal
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Earth and Planetary Astrophysics (astro-ph.EP); Popular Physics (physics.pop-ph)
Cite as: arXiv:2512.07924 [astro-ph.IM] (or arXiv:2512.07924v1 [astro-ph.IM] for this version)
https://doi.org/10.48550/arXiv.2512.07924
Focus to learn more
Submission history
From: Shant Baghram
[v1] Mon, 8 Dec 2025 18:50:48 UTC (462 KB)
https://arxiv.org/abs/2512.07924
Astrobiology, SETI, Technosignature, AStronomy,