November 4, 2024
Black holes on eccentric orbits… what does it even mean? The hard (but fun) thing is that we work in General Relativity, where coordinates don’t have a physics inside. One can always change the coordinates as they want, so they … Continue reading
October 24, 2024
Our “popfisher” paper is finally out! (and now Viola can submit her PhD thesis). This is about next-generation (aka 3G) gravitational wave detectors. Those beasts will measure millions of black holes… and with so many of them who cares about … Continue reading
October 24, 2024
Four BSc students and one MSc student defended their research project with us this month. Thanks all for spending some time in our research group!
October 21, 2024
Huge congrats to Arianna Renzini and Nick Loutrel who won two of this year’s “Giovani Talenti” (Young Talents) prizes from the University of Milano-Bicocca. These are internal grants for postdocs: there were four grants awarded in Physics in total and two of … Continue reading
October 15, 2024
LISA will see a gazillion white dwarfs, but we won’t, or at least not individually. Those signals will actually pile up together in a mashed potato thing called foreground. But this mashed potato won’t be smooth (translate: the gravitational-wave signal … Continue reading
October 8, 2024
Our group is accreting people at the Eddington rate! There are 5 new postdocs and 2 PhD students who have just started or are about to start: Group meetings are funny and busy these days, with too many ideas going … Continue reading
September 26, 2024
This is a fun IMBH story we worked out when Kostas and Luca were visiting last summer from JHU. What if (one day, who knows) we observe a highly spinning intermediate-mass black hole? If that happens, is going to be … Continue reading
September 23, 2024
To Stars or to gas, that is the question.Whether ’tis nobler in the hardening to sufferThe slings and arrows of passing stars,Or to dissipate against a sea of gasAnd by disk end them. To inspiral — to merge,No more; and … Continue reading
September 20, 2024
Four students just graduated with projects in our group… First, huge congrats to Cecilia Fabbri who got her MSc in Astrophysics. Cecilia (you might remember her) worked on an exciting applied statistics problem (which has already ended up in a … Continue reading
September 13, 2024
All right I think this is great (but it took me a long time to convince myself and the others that’s the case!) In gravitational-wave astronomy we measure binaries, that is, pairs of two objects. Our signals have information about … Continue reading
August 9, 2024
The ringdown is the final bit of a gravitational-wave signal, after the two black holes have merged. It’s nice because it’s clean; GR is so powerful that all that comes out after a black hole merger has specific frequencies, the … Continue reading
July 22, 2024
Usually my students graduate in Physics, but not this time… Together with Matteo Boschini, I had the pleasure of supervising a student majoring in Computer Science. Alessandro Crespi got his BSc degree with a project on Simulation Design, which is … Continue reading
July 16, 2024
We’re having a few visitors this summer, with lots of science going around. Welcome Jam Sadiq from SISSA (Italy), Rossella Gamba from Berkeley (USA), Abhishek Chowdhuri from IIT Gandhinagar (India), Luca Reali from JHU (USA), and Kostas Kritos also from … Continue reading
May 27, 2024
The orbits of binary black holes could be eccentric, but in practice they’re not. At least when we observe them, and that’s because of a relativistic effect that circularizes the orbit. Even if astrophysics formed black holes eccentric, relativity makes … Continue reading
April 29, 2024
… and we’re back to selection effects. That means modeling what you cannot see. The black holes that gravitational-wave detectors observe are not representative of those that are out there in the Universe. Some are easier to see, some are … Continue reading
April 18, 2024
This week we’re hosting researchers from the Gran Sasso Science Institute (GSSI) for a joint mini-conference / workshop / group meeting. More here: davidegerosa.com/lautaro This is part of a PRIN grant we have together (thanks Italy) with support from other … Continue reading
April 16, 2024
Population 3 stars are like “the original” stars. Those formed with material that comes straight from the Big Bang. It would be very (like, a lot!) cool to see them with gravitational-wave detectors. But can we tell them apart? Or … Continue reading
April 12, 2024
The University of Milano-Bicocca welcomes applications for PhD scholarships. This year’s application deadline is May 14th, 2024 (noon CEST) for positions starting in the Fall of 2024: https://en.unimib.it/education/postgraduates/doctoral-research-phd-programmes/applying-doctorate/calls-application In particular, we are looking for highly motivated candidates to join our … Continue reading
March 23, 2024
Three more students graduated in March with research projects completed in our group!
March 6, 2024
On top of “astrostats” for the MSc degree in Astrophysics, this semester I’m excited to start teaching for the new BSc degree in Artificial Intelligence. This course is delivered jointly by the University of Milano-Bicocca (my place), the University of … Continue reading
March 6, 2024
The teaching semester is back and I’ll be delivering my “Astrostatistics and Machine Learning” class once more. This is designed for our MSc program in Astrophysics. Astro-data freaks, go here! github.com/dgerosa/astrostatistics_bicocca_2024
March 4, 2024
And the second paper on the arxiv today is Daria’s masterpiece! pAGN (which Daria says you should read “pagan”) is a brand new, super cool code that implements the hydrodynamics of AGN disks, at least in their most popular one-dimensional … Continue reading
March 4, 2024
This is the first of two papers on the arxiv today: it’s fun when two long, very different projects by different people just happen to be done on the same day! This paper is by my former colleague Nate Steinle … Continue reading
February 28, 2024
Our student Lisa Merlo defended her BSc 3rd year project today! Lisa worked with Pippa Cole and me on computing rates for mergers of primordial black holes, also considering a new detector prototype that the experimental group here is developing … Continue reading
February 21, 2024
Huge huge congrats to Zacharias Roupas who was awarded a Marie Curie Fellowship with us! Zachos is currently based at the British University in Egypt and will be joining my group in Milan in the Fall of 2024. The Marie … Continue reading
February 16, 2024
Not sure what happened here, how the hell did I end up writing a paper with actual radio data that needed to be reduced… Call me an ambulance. The guy here is 3C186 which is not a postcode but a … Continue reading
January 23, 2024
The University of Milano-Bicocca (Milan, Italy) will be opening a tenured professorship in astrophysics, with a focus on gravitational-wave data analysis and exploitation. With this notice, we invite expressions of interest from potential candidates. Milano-Bicocca hosts a large group in … Continue reading
December 31, 2023
Much like Spotify, here is our group “Wrapped”, 2023 edition! Some of the group highlights include… We welcomed Pippa, Nick, Arianna, Sshorab, and Matteo. We said bye to Matt who moved to MIT and Nate who moved to Canada, while Daria … Continue reading
November 22, 2023
In the gravitational-wave world, we usually say a binary merger is detected if it has a sufficiently large SNR (signal-to-noise ratio). But is that true? Detection pipelines are far more complicated than that. Here we try to figure out a … Continue reading
November 21, 2023
I’m teaching the first lecture of a new class today. This is “Scientific computing with Python,” a 16h module for PhD students. To the (many) PhD students who signed up: thanks for your interest, hope you’ll like this. BTW the … Continue reading
November 20, 2023
We had another graduation session in November, and a whopping 4 people graduated with research projects in our group. Here are the new BSc physicists who just defended: Congrats all (and twice congrats to Marco and Serena, who graduated with … Continue reading
November 17, 2023
Looks like my name is on a list of the 2% top scientists worldwide. Take these rankings with a grain (or a block) of salt… but this is kind of cool! The list was compiled by Stanford University and bounced … Continue reading
November 3, 2023
This is the latest of the amazing reviews coming out on the LISA space mission. Short post to say that the LISA signal modeling is challenging but so fascinating. Everything you ever wanted to know it’s in here. Niaesh Afshordi, … Continue reading
October 31, 2023
I’m obsessed with spinning black-hole binaries but, guys, spinning and eccentric black holes are even better! This is the first first-author paper by Giulia, who is not only a rising GW astronomer but also a semi-professional baker… So take two … Continue reading
October 28, 2023
We’ve had four amazing research students graduating with us in October! After the Master’s defenses, students turned the graduation party into a football supporter thing, with chants and all the rest!
October 14, 2023
Arianna Renzini (Marie Curie Fellow in my group) is on the Italian national newspaper “Corriere della Sera” today! Here is the online version: Arianna Renzini, la studiosa di Astrofisica corteggiata da tutto il mondo: «Basta cervelli in fuga, lavorerò a … Continue reading
October 11, 2023
…and we’re back to testing GR. We’ve got many gravitational-wave events and would like to use them all together to figure out if our equations for gravity are correct. And here is the issue: there’s only one set (aka catalog) … Continue reading
October 6, 2023
Our group is getting some tremendous additions, with 5 people joining in the fall of 2023! The scope of our research is getting broader and broader 🙂 We’re soon going to have Giulia Capurri who will be visiting us for … Continue reading
September 20, 2023
Three of our BSc students graduated today. And, last but not least, let me add Simone Piscitelli, who last week defended his MSc degree at Milano Statale (“the other” University of Milan) supervised by Costantino Pacilio and myself. Simone worked … Continue reading
September 17, 2023
The University of Milano-Bicocca (Italy) invites expressions of interest for postdoctoral positions in gravitational-wave astronomy. Successful candidates will join the group of Prof. Davide Gerosa and will be part of the “GWmining” project funded by the European Research Council, with … Continue reading
August 28, 2023
Gravitational-wave data keep on giving us surprises. The most outstanding one IMO is an observed correlation between mass ratios and spins of the black holes, which was first found by Tom Callister and friends. That is so, so weird… to … Continue reading
July 19, 2023
Two students just completed their Bachelor’s degree with research projects in our group. I had the honor of heading their graduation committee and could call them “physicists” for the very first time (and the Italian ceremonial sentence is quite imposing: … Continue reading
July 17, 2023
Last week my group and I hosted the international workshop “Gravitational-wave populations: what’s next?.” It’s been a blast! An unconventional conference, with almost zero talks and the vast majority of the time dedicated to discussions. I report the program here … Continue reading
July 10, 2023
New paper from a new student! Here is Matteo Boschini’s first piece of work, where we look at predictions for the final mass and spins of black-hole remnants. That is, after two black hole merge, what’s the mass and spin … Continue reading
June 21, 2023
The University of Milano-Bicocca (Milan, Italy) will be hiring a PhD student under the Italian National PhD program in Space Science and Technology. Candidates with interests in gravitational-wave astronomy, data analysis, and multi-messenger applications are encouraged to apply. For information … Continue reading
June 19, 2023
The advanced class “Big data within science and industry” will take place on September 22nd at the University of Milano-Bicocca (Milan, Italy). https://sites.google.com/unimib.it/bigdatamasterclass Data are everywhere. Exploring scientific data is now at the heart of both scientific advances as well as industrial applications. This one-day … Continue reading
June 7, 2023
All right, this is kind of far from my day-to-day topics but working on this paper with Alice and Riccardo was super fun. Think LISA and supermassive binary black holes. And… the detector does what it wants. That’s not true … Continue reading
June 6, 2023
Happy to report we got a grant from the Italian PRIN program! This is in collaboration with Andrea Maselli from GSSI in L’Aquila. The title is “Gravitational-wave astronomy as a mature field: characterizing selection biases and environmental effects”. Stay tuned … Continue reading
June 3, 2023
Welcome Harrison Blake! My group is hosting a student from the IREU program in Gravitational Physics, which is administered by the University of Florida. Harrison is visiting from Ohio State University and will be working with Michele Mancarella on forecasting … Continue reading
May 30, 2023
We do population analysis in gravitational waves all the time now. That is: we compare many observations from GW experiments against many simulated datapoints from simulations. But what if you only have one observation? That could be a LIGO guy … Continue reading