>Dark energy is known to make up 70% of the mass-energy of the universe, whereas black holes are a mere fraction of the ordinary matter, which constitutes less than 5% of the universe.
Is there some cosmological constraint that says dark energy compressed into a small volume would exhibit gravitational pull and therefore contribute to our measurements of black hole masses? If not then it feels like this is a weak counterargument that makes a pretty big assumption that dark energy must have the same mass-energy equivalence behaviour as regular energy from a general relativity perspective. If black holes somehow are the origin of dark energy, then surely this is driven by physics at energies far beyond our understanding from either particle physics or cosmology. In that case aren't basically all bets off in terms of what you'd expect to observe in terms of apparent black hole masses?
Well the whole idea is to "make it work" under the constrains of our current understanding (General Relativity). After all , all that Dark Energy is by definition is something that is Contrasting the Gravity as described by general Relativity. If we remove that fact than it doesn't need to be reconciled with anything really. Saying that it is a type of energy that doesn't behave according to general Relativity, you need to solve a much bigger problem, find the Substitute of General Relativity that would work for all cases and in that scenario maybe even Gravity is different and you don't even need Dark Energy.
Not that I'm aware, but there are modified GR theories. In classical GR, the equations can be derived by applying the principle of least action with the Ricci scalar R being the Langrangian. People are studying what happens if you assume the Lagrangian is a function of R, like R^n or so. It doesn't have the same stigma as MoND, but it's also not that popular. It's also very hard to test for.
>Is there some cosmological constraint that says dark energy compressed into a small volume would exhibit gravitational pull and therefore contribute to our measurements of black hole masses?
[chatGPT]> There is currently no evidence to suggest that dark energy can be compressed into a small volume and exhibit a gravitational pull in the same way that ordinary matter does. Dark energy is thought to be a property of the vacuum of space itself, and its effect on the universe is driven by its negative pressure, which causes the universe's expansion to accelerate.
Black hole masses are measured by observing their gravitational effects on surrounding matter and other astronomical objects. The mass of a black hole can be estimated by measuring the velocity of nearby stars or gas clouds and using the laws of gravity to infer the mass of the object producing the gravitational field. These measurements are based on our current understanding of gravity and are not affected by the presence or absence of dark energy.
However, it is worth noting that the properties of dark energy are still not fully understood, and there may be some new discoveries or developments in our understanding of gravity that could change our current understanding of these phenomena. Nonetheless, as of now, there is no evidence to suggest that dark energy can contribute to our measurements of black hole masses through its gravitational effects.
I worked on the ATLAS experiment for 6 years. The article gives a reasonable description of the management structure and the unique upsides of that way of working. However it mostly skipped over the negative aspects.
Possibly due to the described desire for consensus, I found the organisation to be incredibly bureaucratic with incredibly lengthy processes. Releasing a paper usually involved around a dozen rounds of review with various groups, often arguing for days about linguistic style more than Physics content.
The lack of clear top-down control makes resource allocation very challenging. There were frequent complaints that Higgs analyses had too much manpower while less "sexy" tasks were chronically understaffed.
The lack of clear assignment of responsibilities also leads to lots of nasty internal politics between institutes. Especially the Higgs analysis where people were eternally engaged in attempts to land grab so they could claim responsibility for bits of the eventual discovery.
Overall, I enjoyed working there a lot. It is a unique structure and the sense of teamwork and lack of hierarchy is very nice. But this article is a bit of a whitewash. I don't think it should be lauded as some incredible model, it has at least as many problems as any other organisation of its size.
I've only worked very briefly in the CMS collaboration, but I've spent a lot of time with people in particle physics collaborations and at medium/large companies. My impression has always been that particle physics collaborations are very well managed for their size, among the best managed human organizations Earth, but that obviously there are friction in getting 3k extremely ambitious scientists to agree on this.
For instance, the "frequent complaints that Higgs analyses had too much manpower" may be valid, but they're not really an example of organizational disfunction unless you had some objective reason to think they were making the wrong decision. Folks disagree about things whether they are inside organizations or not, and if those things are important the disagreement may be venomous. Likewise, the lengthy review process is painful and exhausting, but my impression from almost everyone is that it is sound -- comes to the right conclusions -- and that the conservatism is justified by the field's history of purported discoveries that were later retracted. This soundness is even more impressive when compared to the frequent complaints about the capricious nature of the refereeing process at regular journals, which involves just a handful of physicists. (This is to be compared to physics collaborations outside HEP, like Planck, which are often said to be more dysfunctional.)
So I guess I'm wondering if you could say more comparing ATLAS to similar organizations? "The lack of clear assignment of responsibilities" could certainly be a good criticism, and one that I would actually prefer to apply to physics as a whole. The major rewards are fame and esteem, rather than money, so everyone chases the sexiest, most highly visible tasks.
JPL uses an organizational structure called matrix management. There are two orthogonal management structures, one organized according to expertise (the "line management") and another, almost completely independent one organized according to task (the "program office"). The program office's job was to win contracts, and the line management's job was to provide the people to work on the resulting projects. Through most of JPL's history, its contracts were large NASA missions with budgets in the billions of dollars, and so this management structure made a certain amount of sense. A vast amount of paperwork had to be generated to win even a single contract.
For most of my career I worked on contracts that had already been awarded, so the inner workings of the program office were completely opaque to me (and still are to this day). By the time I got involved in a project the contract had already been awarded according to a proposal that had been generated by some mysterious process that I never fully understood, and which I never actually saw. All I knew was that my line management gave me a set of account numbers, and I wrote those account numbers down on my time card, and I got paid every other week. And this was true of most of the rank-and-file engineers that I worked with.
The result of this opacity was that the incentives and reward structure for individual employees was often in direct conflict with the goals of the Lab and NASA. For example, one of the factors that went into my performance review every year was how many papers I had published. In fact, this was one of the major considerations because it was one of the few things that management could get a quantitative handle on. So naturally I put a lot of effort into getting published. The problem is that the things you have to do in order to get published are often very different from the things you have to do in order to actually be productive on a NASA project. Getting published requires getting approval from your academic peers, who work for different institutions, often competing for the same contracts that your institution is trying to win. The result is a lot of politics and mutual back-scratching (and back-stabbing), because those are often more effective strategies to get papers published than actually doing worthwhile research.
[...]
At the peak of my JPL career I attained the rank of Principal, which is the highest rung on the technical career ladder whose existence is publicly known. (It turns out there are "secret" promotions you can get after that.) It's essentially the equivalent of getting tenure at a university, only with no teaching responsibilities. The decision to promote someone to Principal is made by a committee. I never found out who was on that committee, or what criteria they used to make the decision. But whoever they were, they had the power to render me more or less un-fireable, despite the fact that by then I was not really contributing anything to the Lab's mission.
Is there some cosmological constraint that says dark energy compressed into a small volume would exhibit gravitational pull and therefore contribute to our measurements of black hole masses? If not then it feels like this is a weak counterargument that makes a pretty big assumption that dark energy must have the same mass-energy equivalence behaviour as regular energy from a general relativity perspective. If black holes somehow are the origin of dark energy, then surely this is driven by physics at energies far beyond our understanding from either particle physics or cosmology. In that case aren't basically all bets off in terms of what you'd expect to observe in terms of apparent black hole masses?