Daan Janssen 🏳️🌈
@daanwjanssen.bsky.social
Dutch mathematical physics postdoc in York, UK - working on mathematical foundations of quantum field theory and relativistic quantum information
Scientist by day, gay mess by night.
daanwjanssen.nl
Scientist by day, gay mess by night.
daanwjanssen.nl
Our new paper is out on the ArXiv!
arxiv.org/abs/2508.20939
Using electromagnetism as example, we describe how boundaries in gauge theories give rise to edge modes and quantum reference frames for boundary/large gauge transformations.
#paperalert #mathsky #physics #science
arxiv.org/abs/2508.20939
Using electromagnetism as example, we describe how boundaries in gauge theories give rise to edge modes and quantum reference frames for boundary/large gauge transformations.
#paperalert #mathsky #physics #science
August 29, 2025 at 7:33 AM
Our new paper is out on the ArXiv!
arxiv.org/abs/2508.20939
Using electromagnetism as example, we describe how boundaries in gauge theories give rise to edge modes and quantum reference frames for boundary/large gauge transformations.
#paperalert #mathsky #physics #science
arxiv.org/abs/2508.20939
Using electromagnetism as example, we describe how boundaries in gauge theories give rise to edge modes and quantum reference frames for boundary/large gauge transformations.
#paperalert #mathsky #physics #science
Last week, a group of 75 young researchers from all over the world came to York for the EMS-IAMP Spring School: Symmetry and Measurement in Quantum Field Theory. It was an absolute pleasure to organize this event.
April 14, 2025 at 2:16 PM
Last week, a group of 75 young researchers from all over the world came to York for the EMS-IAMP Spring School: Symmetry and Measurement in Quantum Field Theory. It was an absolute pleasure to organize this event.
#paperalert
Read here our paper published in CMP on how quantum reference frames can be used in the description of measurements on symmetric backgrounds and the relation to recent results on type reduction of algebras of observables in QFT.
link.springer.com/article/10.1...
Read here our paper published in CMP on how quantum reference frames can be used in the description of measurements on symmetric backgrounds and the relation to recent results on type reduction of algebras of observables in QFT.
link.springer.com/article/10.1...
Quantum Reference Frames, Measurement Schemes and the Type of Local Algebras in Quantum Field Theory - Communications in Mathematical Physics
We develop an operational framework, combining relativistic quantum measurement theory with quantum reference frames (QRFs), in which local measurements of a quantum field on a background with symmetr...
link.springer.com
December 18, 2024 at 10:18 PM
#paperalert
Read here our paper published in CMP on how quantum reference frames can be used in the description of measurements on symmetric backgrounds and the relation to recent results on type reduction of algebras of observables in QFT.
link.springer.com/article/10.1...
Read here our paper published in CMP on how quantum reference frames can be used in the description of measurements on symmetric backgrounds and the relation to recent results on type reduction of algebras of observables in QFT.
link.springer.com/article/10.1...
On a train back to York and suddenly there’s snow everywhere ☃️
November 19, 2024 at 12:28 PM
On a train back to York and suddenly there’s snow everywhere ☃️
In a slight existential crisis again because should I use bluesky for making contact with other scientists or post about gay shenanigans. I don’t suppose bluesky has the option to make private alts yet 🤔
November 19, 2024 at 9:05 AM
In a slight existential crisis again because should I use bluesky for making contact with other scientists or post about gay shenanigans. I don’t suppose bluesky has the option to make private alts yet 🤔
Definitely need to plan my next visit to @kcl.ac.uk on a sunny day for an even better view
November 18, 2024 at 5:27 PM
Definitely need to plan my next visit to @kcl.ac.uk on a sunny day for an even better view
On my way to London to pick up my passport and attend the LGBTQIA+ STEM Day event at the Royal Institute by @prideinstem.bsky.social, who am I seeing there?
November 18, 2024 at 10:42 AM
On my way to London to pick up my passport and attend the LGBTQIA+ STEM Day event at the Royal Institute by @prideinstem.bsky.social, who am I seeing there?
Happy LGBTQIA+ STEM Day everyone!
November 18 is the International Day of LGBQTIA+ People in STEM! Today more than ever we want to stress the importance of communities, building connections, and raising each other up. Let's keep leaving our mark for the betterment of us all! 🏳️⚧️🏳️🌈 #QueerinSTEM
prideinstem.org/lgbtstemday/
prideinstem.org/lgbtstemday/
November 18, 2024 at 9:11 AM
Happy LGBTQIA+ STEM Day everyone!
Reposted by Daan Janssen 🏳️🌈
🚨 Deadline Approaching: 10 December 2024! 🗓
LGBTQ STEM Berlin is looking for new volunteers to join our Core Team!
If teamwork and leadership are your vibe, we’re the perfect fit for you! 🌈
📩 Reach out: [email protected]
#Berlin #LGBTQSTEM #STEM #Inclusion #QueerInSTEM
LGBTQ STEM Berlin is looking for new volunteers to join our Core Team!
If teamwork and leadership are your vibe, we’re the perfect fit for you! 🌈
📩 Reach out: [email protected]
#Berlin #LGBTQSTEM #STEM #Inclusion #QueerInSTEM
November 16, 2024 at 2:29 PM
🚨 Deadline Approaching: 10 December 2024! 🗓
LGBTQ STEM Berlin is looking for new volunteers to join our Core Team!
If teamwork and leadership are your vibe, we’re the perfect fit for you! 🌈
📩 Reach out: [email protected]
#Berlin #LGBTQSTEM #STEM #Inclusion #QueerInSTEM
LGBTQ STEM Berlin is looking for new volunteers to join our Core Team!
If teamwork and leadership are your vibe, we’re the perfect fit for you! 🌈
📩 Reach out: [email protected]
#Berlin #LGBTQSTEM #STEM #Inclusion #QueerInSTEM
Hadn’t been very active on ‘that other app’ for a while now, but it feels good to be back in a place where the sky is blue
November 16, 2024 at 12:17 AM
Hadn’t been very active on ‘that other app’ for a while now, but it feels good to be back in a place where the sky is blue
Happy to announce our Spring School on Symmetry and Measurement in Quantum Field Theory, taking place in York this April.
Speakers include Chris Fewster, Doreen Fraser, Kasia Rejzner and Michele Schiavina. More information can be found on our website.
sites.google.com/york.ac.uk/s...
Speakers include Chris Fewster, Doreen Fraser, Kasia Rejzner and Michele Schiavina. More information can be found on our website.
sites.google.com/york.ac.uk/s...
November 14, 2024 at 11:15 AM
Happy to announce our Spring School on Symmetry and Measurement in Quantum Field Theory, taking place in York this April.
Speakers include Chris Fewster, Doreen Fraser, Kasia Rejzner and Michele Schiavina. More information can be found on our website.
sites.google.com/york.ac.uk/s...
Speakers include Chris Fewster, Doreen Fraser, Kasia Rejzner and Michele Schiavina. More information can be found on our website.
sites.google.com/york.ac.uk/s...
I kinda was hoping to meet more gay or queer people working in mathematical physics during this conference season, but it seems we’re still a rare breed (or we mostly hide)
#queerinscience #queerinmath
#queerinscience #queerinmath
July 3, 2024 at 9:54 AM
I kinda was hoping to meet more gay or queer people working in mathematical physics during this conference season, but it seems we’re still a rare breed (or we mostly hide)
#queerinscience #queerinmath
#queerinscience #queerinmath
These Dutch election results may be the starting point of my winter depression 😬
November 22, 2023 at 10:28 PM
These Dutch election results may be the starting point of my winter depression 😬
Reposted by Daan Janssen 🏳️🌈
We have several volunteer opportunities! Soapbox Science & LGBTQ+ STEM Berlin need your help to run these wonderful Berlin Science Week events & promote Women In STEM & LGBTQ+ people in research
berlinsoapboxscience.wordpress.com/2023/10/09/c...
Deadline is October 20, 2023
berlinsoapboxscience.wordpress.com/2023/10/09/c...
Deadline is October 20, 2023
Call for Volunteers: Berlin Science Week
Calling All Science Enthusiasts and Innovators: Become a Volunteer at Berlin Science Week 2023! Apply Here This year we’re super excited to be teaming up again to host not one, but two events for ...
berlinsoapboxscience.wordpress.com
October 18, 2023 at 7:12 PM
We have several volunteer opportunities! Soapbox Science & LGBTQ+ STEM Berlin need your help to run these wonderful Berlin Science Week events & promote Women In STEM & LGBTQ+ people in research
berlinsoapboxscience.wordpress.com/2023/10/09/c...
Deadline is October 20, 2023
berlinsoapboxscience.wordpress.com/2023/10/09/c...
Deadline is October 20, 2023
After having successfully defended my PhD thesis on semi-classical gravity at the university of Leipzig, I am looking forward to starting a postdoc at the University of York. Here I will work on measurement theory for quasi-local observables in quantum field theory and gravity.
October 19, 2023 at 10:06 AM
After having successfully defended my PhD thesis on semi-classical gravity at the university of Leipzig, I am looking forward to starting a postdoc at the University of York. Here I will work on measurement theory for quasi-local observables in quantum field theory and gravity.