Could dark matter be the cold, dead remnants of a previous big bang?

Not within the current model.

Thank you for your reply. I understand you to mean that the idea I outlined is not part of the current model. I agree with that because it is obviously true. But, I wish to learn more about the history of the development of the current model. Specifically, did anybody ever consider (and reject) the idea I outlined? Can someone tell me that they tried to model it and the models didn't work? If so, I'd like to hear that. I find it difficult to search for references to this idea because it is so obscure; I get no hits.

As I understand it, 'dark matter' is (mathematically)required to make up the total mass in the universe to account for some gravitational phenomena, such as ths bending of light by 'invisible mass' The phrase 'current model' tends to be ambiguous because it could refer either to 'the standard model' of fundamental particles, or to the mechanics involved in gravitational models.
NB. I suggest you take care with the phrase 'obviously true' since both 'obvious' and 'truth' may have little relevance in the shifting paradigms of frontier
science.

Thank you, Fresco. Although my understanding of dark matter is limited, I think it is meant to explain how gas clouds collapsed to form galaxies faster than the amount of visible matter within them can account for. A large amount of unseen mass probably accounts for it. In most of the articles I read, physicists are searching for hitherto unknown particles to be that mass. When I read such articles, I often find myself doing lateral thinking to create more parsimonious explanations. This post is one such. It is a very simple idea, quite different from what I normally see in Science News, and probably wrong. But don't have the means to test it. I hope to find an appropriate forum for doing that. An ideal forum would be a large list of frequently asked physics questions with answers like, "such-and-such person tried to model that, once, and it didn't work." Can anyone suggest a forum or searchable database for me to try?

According to wikipedia dark matter was invented in 1932 by Ian Oort to fudge his data so it would agree with his theory. Somehow it got to be the basis for about half of everything we think we know about the universe. This is called "hoax".