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Stephen Green

@stephenrgreen.bsky.social
1.5K followers 319 following 91 posts

ML / SBI | Black Holes and Gravitational Waves UKRI Future Leaders Fellow @ U of Nottingham www.stephenrgreen.com

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Stephen Green @stephenrgreen.bsky.social · 02/10/2026
Quite the analogy. Also this person doesn’t care about their own foot or performing well in the marathon. And probably plans to find another job before the race even starts.
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Stephen Green @stephenrgreen.bsky.social · 01/10/2026
There is no logic to anything she does.
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University and College Union (UCU) @ucu.org.uk · 30/09/2026
Strikes start today at Nottingham. “These are not cash-strapped universities.” Dr Jo Grady on R4 this morning. 700 jobs. 48 courses. All to drive a surplus. Show your support. ✊
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Stephen Green @stephenrgreen.bsky.social · 29/09/2026
UoN: "While we know many of our students will be unaffected by this action, the timing of this to deliberately disrupt the start of the new academic year for our students is particularly disappointing.” What about your timing to decide to fire a quarter of the academics at your university?
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Alexander Kasprzyk @amkasprzyk.bsky.social · 29/09/2026
The ability to end these disruptive strikes lies in the hands of @uniofnottingham.bsky.social managers. The staff on strike are trying to save the university and the education of current and future students. #UCU #UKHE www.bbc.co.uk/news/article...
bbc.co.uk
Student: University of Nottingham strikes 'not what we signed up for'
The University of Nottingham said it was "disappointed" by the timing of industrial action.
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Stephen Green @stephenrgreen.bsky.social · 28/09/2026
Sounds like Nottingham too :(
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Stephen Green @stephenrgreen.bsky.social · 22/09/2026
Could it be that the focus on testing just makes English students good at taking tests?
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Emiliano Mellino @mellino.bsky.social · 15/09/2026
The UK government is making upwards of £4.9bn in profit from visa fees, citizenship fees & the immigration health surcharge. Meanwhile, people are getting into thousands of pounds of debt or going without food just to afford to these immigration fees. www.thebureauinvestigates.com/stories/2026...
thebureauinvestigates.com
Government makes £5bn a year from immigration fees while applicants…
Home Office’s fees are up to 10 times the processing cost – and rising every year
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Stephen Green @stephenrgreen.bsky.social · 04/09/2026
As a physicist who maintains a decent-sized code base (tens of thousands of lines) I find that I’m busier than ever after the rise of AI coding. There is much more to review (AI helps with this) and we take on more ambitious tasks (Jevons). I find it’s still necessary to understand the code.
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Alex Prichard @profalexp.bsky.social · 28/08/2026
My 3rd thread on the dispute at Exeter Uni. What are we fighting for? Is it just to save jobs? No. We need a workplace that is run by the expert professionals that make up the staff body. This 🧵 explains the governance reform proposals we have put to Council, Senate and the Uni Exec #DefendExeterUni
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Stephen Green @stephenrgreen.bsky.social · 29/08/2026
Everything in this thread sounds eerily familiar and could easily be describing Nottingham. We need to fix the way UK universities are governed if the sector is to survive.
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Stephen Green @stephenrgreen.bsky.social · 28/08/2026
The fEC includes a lot of centrally allocated overheads, though, which scale with the size of the grant. The grant’s marginal draw is far below the allocated rate, so even with 80% cost recovery, the university comes out ahead—which is why they still ask us to apply.
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Hillary Rodham Clinton @hillaryclinton.bsky.social · 27/08/2026
It’s Lake Ontario.
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Plashing Vole @plashingvole.bsky.social · 07/08/2026
Delighted to hear today that the answer to ‘who will supervise PhDs whose supervisors are being sacked?’ is ‘hire hourly-paid supervisors who were sacked in the previous round of sackings’. This rather whiffs of fake redundancies.
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Stephen Green @stephenrgreen.bsky.social · 07/08/2026
Sounds familiar
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Financial Times @financialtimes.com · 07/08/2026
The standard explanation for Britain’s declining graduate wage premium is that higher education expanded too fast and too far. But similar expansions elsewhere have not produced the same outcome, writes John Burn-Murdoch. ft.trib.al/smljhw9
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Andrew McRae @mcraeandrew.bsky.social · 21/07/2026
Letter from the executive director of the Modern Language Association to the Uni of Exeter VC: ‘We are aware of no university on the financial footing of Exeter that has seen the need to make dramatic cuts to the humanities such as you propose.’ #DefendExeterUni
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Stephen Green @stephenrgreen.bsky.social · 23/07/2026
Now it's clear that we use our product for orthogonal projections, but we can express matrix elements of perturbative quantities in terms of the other product. There are also practical implications, particularly for calculating effects in beyond-GR theories and due to black hole environments.
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Stephen Green @stephenrgreen.bsky.social · 23/07/2026
This work helped to resolve a number of confusions, including connections between our product, and another one used in eigenvalue perturbation theory for quasinormal modes (e.g., arxiv.org/abs/1409.5800).
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Stephen Green @stephenrgreen.bsky.social · 23/07/2026
Instead, we use a Green's function method to get the mode shifts in terms of projections onto unperturbed modes plus integrals over continuous pieces (the high-frequency arc and the branch cut).
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Stephen Green @stephenrgreen.bsky.social · 23/07/2026
The complication is that quasinormal modes are dissipative, and therefore aren't part of a self-adjoint system. So we don't have a spectral theorem and they don't form a complete basis. This means we can't directly write down expressions for the mode shifts as you would do in quantum mechanics.
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Stephen Green @stephenrgreen.bsky.social · 23/07/2026
This work is based on a bilinear product (developed in arxiv.org/abs/2210.15935), which serves as an orthogonal projector for the perturbation theory. It allows us to write down equations for frequency shifts at any order in terms of lower order mode shifts.
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Stephen Green @stephenrgreen.bsky.social · 23/07/2026
Very happy for my student Jacopo Lestingi in getting this paper out! We adapt Rayleigh-Schrödinger perturbation theory to the black hole setting to work with quasinormal modes.
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Stephen Green @stephenrgreen.bsky.social · 19/07/2026
This is why you should have a proper leadership race instead of a coronation. Subject plans to some sort of scrutiny beforehand. Or at least figure out what the guy stands for.
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Sesh Nadathur @seshnadathur.bsky.social · 03/07/2026
Last week a paper in Nature claimed a detection of Gpc-scale anisotropic cosmic structures, violating the basic principle on which all #cosmology is based: www.nature.com/articles/s41... This week, a preprint says they made an elementary coordinate mistake: arxiv.org/pdf/2607.01172 🔭🧪 🧵 1/? ⬇️
nature.com
Detection of anisotropic cosmic structures on a gigaparsec scale - Nature
Using the parameter-free Angular Distribution of Pairwise Distances for measuring directional correlations, evidence is found for coherent anisotropic structures extending over gigaparsec scales,...
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becimay @becimay.bsky.social · 27/06/2026
In case you didn’t know, Exeter uni, where I work, has announced a plan to make 25% of staff in my English department redundant. Left-over staff will do double the teaching while their research time will be shrunk to 1%. Meanwhile admissions for English at Exeter are HIGH, and on the rise this year
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University of Nottingham UCU branch @uonucu.bsky.social · 19/06/2026
... as well as an improvement to the current voluntary redundancy scheme. The employer refused and merely offered a short extension to the current consultation period." Another clear indication that this administration simply does not care about the education of its own students.
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Times Higher Education (THE) @timeshighered.bsky.social · 15/06/2026
Marking boycotters face heavy sanctions as assessments disrupted: Edinburgh extends pay deductions to those who refuse to cover for colleagues taking part in industrial action www.timeshighereducation.com/news/m…
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Stephen Green @stephenrgreen.bsky.social · 10/06/2026
Congratulations @derkal.bsky.social !!!
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Stephen Green @stephenrgreen.bsky.social · 01/06/2026
UK businesses have failed to “transform this country from a GDP perspective”, so let’s apply their ideas to universities…
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Hannah O’Regan @palaeohan.bsky.social · 31/05/2026
Excellent essay here on the state of higher education in the UK. www.lrb.co.uk/the-paper/v4...
lrb.co.uk
Stefan Collini · Squadrons of Pigs: Bonfire of the Universities
The problems with Britain’s universities are systemic and deep-rooted, not just local or contingent. Yet political and...
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Stephen Green @stephenrgreen.bsky.social · 25/05/2026
For context, once you strip out one-time costs (mainly real estate misadventures by management), UoN is roughly breaking even right now. They are sacking a fifth of academics just for the hell of it (because they want up to a 9% surplus in five years).
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Stephen Green @stephenrgreen.bsky.social · 25/05/2026
Also complete disinterest from the Department of Education 🤷‍♂️
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Stephen Green @stephenrgreen.bsky.social · 25/05/2026
My university made the FT, not in a good way. The squeeze in overseas students is definitely an issue. But the corporatization of UK university management has been disastrous.
giftarticle.ft.com
UK universities cut jobs, research and teaching amid squeeze in overseas students
‘Very sharp downturn’ in enrolments risks hitting economic innovation and academic pipeline, lobby group says
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QM_UCU @qmucu.bsky.social · 25/05/2026
How does the Department for Education keep getting away with these non-statements? You clearly did not take any action that meaningfully improved the situation in the #UKHE sector, as 79% of said sector is making voluntary redundancies. Can journalists please push back? www.ft.com/content/ded7...

	The Department for Education said it had “already taken action to put universities on a firmer financial footing”.

“We expect universities to take appropriate decisions to ensure their long-term sustainability, which could be merging with another institution and more collaboration in the sector,” it added.
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Stephen Green @stephenrgreen.bsky.social · 25/05/2026
arxiv.org/abs/2602.10181
arxiv.org
Why do we do astrophysics?
At time of writing, large language models (LLMs) are beginning to obtain the ability to design, execute, write up, and referee scientific projects on the data-science side of astrophysics. What implic...
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Stephen Green @stephenrgreen.bsky.social · 23/05/2026
Wasn’t listed. Everything about this program is disorganized.
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Stephen Green @stephenrgreen.bsky.social · 21/05/2026
static.klipy.com
Randy Bump on the Bus
ALT: Randy Bump on the Bus
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Stephen Green @stephenrgreen.bsky.social · 16/05/2026
(Corrected) table showing proposed academic headcount reductions at UoN. Still just as unjustified and drastic as before.
Table titled "University of Nottingham" with subtitle "FN2 — academic-staff cuts by School". Four columns: School, Current, Proposed, % cut. The % cut cells are colour-coded from white through orange to dark red, with white text on the darkest cells. 29 rows separated into five groups by solid black horizontal dividers. Values follow:

Group 1.
  ACS: 9 → 0 (100.0%).
  CMVS: 31 → 24 (22.6%).
  Classics and Ancient History: 22 → 17 (22.7%).
  English: 49 → 33 (32.7%).
  Foundation Arts: 3 → 3 (0.0%).
  History: 38 → 30 (21.1%).
  Liberal Arts: 6 → 6 (0.0%).
  Modern Languages: 73 → 0 (100.0%).
  Music: 12 → 0 (100.0%).
  Philosophy: 31 → 24 (22.6%).

Group 2.
  Engineering: 332 → 281 (15.4%).

Group 3.
  Health Sciences: 124 → 76 (38.7%).
  Life Sciences: 139 → 115 (17.3%).
  Medicine: 248 → 127 (48.8%).
  Vet Medicine and Science: — → — (0.0%).

Group 4.
  Biosciences: 103 → 56 (45.6%).
  Chemistry: 46 → 32 (30.4%).
  Computer Science: 84 → 79 (6.0%).
  Mathematical Sciences: 71 → 60 (15.5%).
  Pharmacy: 65 → 54 (16.9%).
  Physics & Astronomy: 71 → 51 (28.2%).
  Psychology: 72 → 72 (0.0%).

Group 5.
  Economics: 62 → 56 (9.7%).
  Education: 103 → 60 (41.7%).
  Geography: 43 → 32 (25.6%).
  Law: 87 → 80 (8.0%).
  NUBS: 180 → 127 (29.4%).
  Politics & International Relations: — → — (0.0%).
  SSP: 58 → 49 (15.5%).
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Stephen Green @stephenrgreen.bsky.social · 16/05/2026
The current CS number should be 84.
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Stephen Green @stephenrgreen.bsky.social · 16/05/2026
Here's the new version, with those numbers corrected, as well as CS current number.
Table titled "University of Nottingham" with subtitle "FN2 — academic-staff cuts by School". Four columns: School, Current, Proposed, % cut. The % cut cells are colour-coded from white through orange to dark red, with white text on the darkest cells. 29 rows separated into five groups by solid black horizontal dividers. Values follow:

Group 1.
  ACS: 9 → 0 (100.0%).
  CMVS: 31 → 24 (22.6%).
  Classics and Ancient History: 22 → 17 (22.7%).
  English: 49 → 33 (32.7%).
  Foundation Arts: 3 → 3 (0.0%).
  History: 38 → 30 (21.1%).
  Liberal Arts: 6 → 6 (0.0%).
  Modern Languages: 73 → 0 (100.0%).
  Music: 12 → 0 (100.0%).
  Philosophy: 31 → 24 (22.6%).

Group 2.
  Engineering: 332 → 281 (15.4%).

Group 3.
  Health Sciences: 124 → 76 (38.7%).
  Life Sciences: 139 → 115 (17.3%).
  Medicine: 248 → 127 (48.8%).
  Vet Medicine and Science: — → — (0.0%).

Group 4.
  Biosciences: 103 → 56 (45.6%).
  Chemistry: 46 → 32 (30.4%).
  Computer Science: 84 → 79 (6.0%).
  Mathematical Sciences: 71 → 60 (15.5%).
  Pharmacy: 65 → 54 (16.9%).
  Physics & Astronomy: 71 → 51 (28.2%).
  Psychology: 72 → 72 (0.0%).

Group 5.
  Economics: 62 → 56 (9.7%).
  Education: 103 → 60 (41.7%).
  Geography: 43 → 32 (25.6%).
  Law: 87 → 80 (8.0%).
  NUBS: 180 → 127 (29.4%).
  Politics & International Relations: — → — (0.0%).
  SSP: 58 → 49 (15.5%).
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Stephen Green @stephenrgreen.bsky.social · 16/05/2026
That’s clearly an error. I’m making a better table now.
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Stephen Green @stephenrgreen.bsky.social · 16/05/2026
This was shared in a chat, but the few numbers I’ve checked were correct. I’ll remake a better version if you’re saying some numbers are off.
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Clare Burrage @clareburrage.bsky.social · 15/05/2026
To the 800+ of you who have signed the letter of support for Physics and Astronomy at Nottingham since yesterday, I cannot thank you enough. Please continue to sign and share as much as you can. nottinghamphysics.github.io/Open_Letter/
nottinghamphysics.github.io
Save Nottingham Physics and Astronomy
We, the undersigned, call on the University of Nottingham to reverse its plans to impose compulsory redundancies on its staff in the School of Physics and Astronomy.
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Stephen Green @stephenrgreen.bsky.social · 16/05/2026
For even further context: here’s a list of cuts across the university. From a financial standpoint we are roughly break even right now, once you remove the non-cash real estate write down and redundancy payments. Nothing to justify this.
Table showing, for each school, current staff numbers, projected headcount, and projected fractional reduction.
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K R @kringelberg.bsky.social · 13/05/2026
Hardly the point and solidarity with all arts & humanities colleagues everywhere facing this nonsense, but here's where the British use of "redundancy" doesn't seem right--the American "fired without cause" is perhaps more apt.
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Research Professional News @resprofnews.bsky.social · 13/05/2026
Nottingham job cuts ‘pose systemic risks to research’, union warns. Research-intensive university told it risks “intellectual stagnation” as 2,700 staff put at risk of redundancy. www.researchprofessionalnews.com/rr-news-uk-u...
researchprofessionalnews.com
Nottingham job cuts ‘pose systemic risks to research’, union warns - Research Professional News
Research-intensive university told it risks “intellectual stagnation” as 2,700 staff put at risk of redundancy
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John E. Richardson @discodiscourse.bsky.social · 12/05/2026
The University presents this as 'Future Nottingham' but it absolutely guts the arts and humanities. They want to sack 40% of the Dept of English, for example. Languages will be cut entirely. If that's the future, it's shit (and very far from what a University should be)
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The Guardian @theguardian.com · 12/05/2026
Thousands of University of Nottingham staff told they are at risk of redundancy
theguardian.com
Thousands of University of Nottingham staff told they are at risk of redundancy
Institution says it could run out of money by 2031 and wants to cut more than 600 academic and support posts Thousands of staff at the University of Nottingham have been told to prepare for redundancy as part of swingeing financial cuts that academics say will harm the institution’s future. The university’s administration sent letters to 2,700 staff on Tuesday, notifying them their role was at risk of redundancy after its leadership said it could run out of money by 2031. Continue reading...
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