Talk:Primordial black hole

This article measures mass in both g and kg. We should pick one unit and adjust the others to match. I suggest kg, since I've never seen grams used to measure a mass greater than a few kg. (Similar to how the distance from New York to Chicago is measured in kilometers or miles, never meters or yards.) Piojo (talk) 01:50, 15 September 2016 (UTC)

This article was the subject of a Wiki Education Foundation-supported course assignment, between 10 January 2023 and 30 April 2023. Further details are available on the course page. Student editor(s): Jvega1314 (article contribs).

— Assignment last updated by Jvega1314 (talk) 04:49, 21 April 2023 (UTC)

In case there's ever an "in fiction" section, I'll mention two stories by Larry Niven: "The Borderland of Sol" (1976) and "The Hole Man" (1975). —Tamfang (talk) 05:09, 23 April 2023 (UTC)

In "Borderland", iirc, someone guessed that the Tunguska event was the passage of a black hole, traced its likely trajectory, found it and made use of it. —Tamfang (talk) 05:06, 7 November 2023 (UTC)

And a short novel by Greg Egan, Perihelion Summer (2019?). —Tamfang (talk) 00:04, 2 July 2023 (UTC)

I'm on the fence as to whether including this would be WP:UNDUE weight: https://phys.org/news/2020-08-planet-primordial-black-hole.html I'll leave it here for a while asking for guidance. Sandizer (talk) 00:11, 14 May 2023 (UTC)

What it says on the tin; just putting these here to remember to check in on later:

• Oncins (2022) "Constraints on PBH as dark matter from observations: a review", comes with a video
• Bernard Carr et al. (2023) "Observational Evidence for Primordial Black Holes: A Positivist Perspective"
• Su, Li, and Feng (2023) "An inflation model for massive primordial black holes to interpret the JWST observations"
• Depta et al. (2023) "Do pulsar timing arrays observe merging primordial black holes?"

All four are pretty juicy, which is why I'm a bit reluctant to add until they pass review. Sandizer (talk) 02:21, 5 October 2023 (UTC)

Carr et al. (2024) made it into Physics Reports: https://www.sciencedirect.com/science/article/pii/S0370157323003976 -- very ambitious with 68 pages and 451 references! It sort of calls itself a review in the first sentence of the Abstract, and I don't see how anyone could argue. Sandizer (talk) 10:36, 15 February 2024 (UTC)

@The Squirrel Conspiracy: I'm wondering why you reverted all four of these edits. Do you really have a problem with all of them? Could you please elaborate your objections so we might have some way to find a compromise? ~2025-41114-38 (talk) 00:49, 16 December 2025 (UTC)

I was only trying to remove the AI image, per WP:AIB. When I looked at the difference between the last edit before the IP and the last set of IP, that's all I saw, but now that I'm looking at the edits one by one, I do see that there is other stuff that was added. Weird. Feel free to restore anything that's not the AI images. The Squirrel Conspiracy (talk) 01:54, 16 December 2025 (UTC)

pre-primordial black holes: Black holes of the parent universe and also those formed during big crunch before the big bang (big crunch and big bang in cyclic cosmology become capitalized only when referring to our own universe-strain).

Omitting the terminology causes confusion. Big Crunch has pre-primordial black holes (the old black holes of the parent universe and the ones created by the Big Crunch, because it doesn't get immediately homogeneous and in some theories it always has surviving inhomogeneities even during and after the Big Bang spatiotemporal implosion). ~2025-43464-99 (talk) 06:52, 28 December 2025 (UTC)

If there were black holes prior to a universal singularity, they would have been crushed into it. Amientan (talk) 09:30, 28 January 2026 (UTC)

The article is maximally biased. It only focuses on stable primordial black hole theories. In some theories primordial black holes pop in-and-out-of-existence and only the stellar-massed ones (around 3 to 3.8 solar masses and above) have a big horizon which stops their entrails tunneling outside; mere very strong gravitational wells don't prevent the Hawking radiation explosion because the size of the horizon is an important parameter. I don't support this particular claims. But the article is biased because it focuses only on stable primordial black holes. We aren't supposed to be biased. — Preceding unsigned comment added by ~2025-43464-99 (talk) 09:51, 28 December 2025 (UTC)

Do you have a good source for unstable PBHs? Amientan (talk) 09:29, 28 January 2026 (UTC)