As you might have noticed we added a new application recently. It is devoted to investigate the spin evolution of black holes.

When a black hole accretes matter, at the same time it accretes the angular momentum, which results in faster spinning. In this model we examine the influence of this process. What makes it particularly interesting is the fact the the LIGO observatory of gravitational waves started to operate recently. Therefore, in the near future, our theoretical predictions will be checked against observation.

Wojciech Gładysz, who cooperates with us in this project prepared a longer description of this problem which I posted in the Science section. I invite you to take a look.

I hope that you will become interested in this research!

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Grzegorz Wiktorowicz
National Astronomical Observatories,
Chinese Academy of Sciences

Jest problem z czasami zadań... Na każdym z moich komputerów planowany czas to 2 godziny, a potem obliczanie trwa o wiele dłużej. Z czego to się bierze?

Jeśli przekroczył 5 godzin, a końca nie widać, to oznacza, że trafiłeś na uszkodzone zadania. Sam musiałem swoje anulować, bo liczyły się bez końca.

Takie mi się nie zdarzyły... Za to miałem takie co miały trwać parę godzin, a trwały 20, ale się kończyły. Za to wszystkie nowe z BHspin mają niedoszacowane czasy...

there is an issue with estimated time of completion with these new units. it says 2 minutes to complete when its 3+ hours. unfortunately my machine downloaded so many that the deadline will pass before I finish a fraction of them.

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The same for me. Incorrect time causes lot of unneccessary downloads -> lot of unfinished tasks for everyone -> lot of errors -> not validated tasks -> wasting of time and credits of people who participate. Please fix it ASAP or turn off BHspin application...

Sorry to all for this problem and thanks for notifying us! We were trying to find out where the problem lies but up to now we don't know. On our test computers we didn't encounter such problems. Probably some systems in a very uncommon case go into endless loop. In the future version of the code, which should be prepared in a few/several weeks, we will add additional output to investigate this problem.

Currently the data from this BHspin application is strongly needed by ongoing project connected with the observations of gravitational waves. As you may know the LIGO observatory have just started to operate after significant upgrades and a lot of people are looking forward to first results.

If you keep obtaining this error with BHspin app, please switch to ULX. We hope that this problem will be solved soon.

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Grzegorz Wiktorowicz
National Astronomical Observatories,
Chinese Academy of Sciences

What does the new app version (0.09) do different?

Nothing at the moment. We prepare new version for new starting parameters in next WU batches.

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Krzysztof 'krzyszp' Piszczek

Member of Radioactive@Home team
My Patreon profile
Universe@Home on YT

This sounds fascinating. To you this is not new, but to me it is, I just started out at Universe@home and I was thrilled at discovering this is actually research relating to Black Holes!

You are saying the accreting matter increases the spin of the BH. The BH, as far as I know, already spins extremely fast. How faster can it go? What are the limits? What does the accreting matter normally consist of - is it just "dust"?

Wojciech Gładysz, who cooperates with us in this project prepared a longer description of this problem which I posted in the Science section. I invite you to take a look.

Can you post the link please?