Cameron R D Bunney
@cameronrdbunney.bsky.social
Mathematical Physicist at @uniofnottingham.bsky.social | QFT(CS) | GR | Unruh effect | PhD Mathematics | Principal Tuba and Chairman Whitwell Brass Band 🎼
Personal page: cameronbunney.com
Linguistics page: lingualiebender.com
Personal page: cameronbunney.com
Linguistics page: lingualiebender.com
Reposted by Cameron R D Bunney
HISTORY OF PHYSICS
On how Emmy Noether came to physics (while remaining a pure mathematician)
The variational problem posed by Emmy Noether in her seminal 1918 paper leads to three theorems.
Everything began with Felix Klein’s observation (in his response to 1916 Hilbert’s first note
1/
On how Emmy Noether came to physics (while remaining a pure mathematician)
The variational problem posed by Emmy Noether in her seminal 1918 paper leads to three theorems.
Everything began with Felix Klein’s observation (in his response to 1916 Hilbert’s first note
1/
April 12, 2025 at 8:03 PM
HISTORY OF PHYSICS
On how Emmy Noether came to physics (while remaining a pure mathematician)
The variational problem posed by Emmy Noether in her seminal 1918 paper leads to three theorems.
Everything began with Felix Klein’s observation (in his response to 1916 Hilbert’s first note
1/
On how Emmy Noether came to physics (while remaining a pure mathematician)
The variational problem posed by Emmy Noether in her seminal 1918 paper leads to three theorems.
Everything began with Felix Klein’s observation (in his response to 1916 Hilbert’s first note
1/
Reposted by Cameron R D Bunney
The English words 'no' and 'no' don't have the same origin.
'No', the opposite of 'yes', comes from West-Germanic *naiw ("never").
'No' as in 'no pain, no gain' arose as a variant of 'none' and stems from *nain ("not any").
They only share the n-, from *ne ("not").
Click to learn more:
1/
'No', the opposite of 'yes', comes from West-Germanic *naiw ("never").
'No' as in 'no pain, no gain' arose as a variant of 'none' and stems from *nain ("not any").
They only share the n-, from *ne ("not").
Click to learn more:
1/
January 15, 2025 at 5:59 PM
The English words 'no' and 'no' don't have the same origin.
'No', the opposite of 'yes', comes from West-Germanic *naiw ("never").
'No' as in 'no pain, no gain' arose as a variant of 'none' and stems from *nain ("not any").
They only share the n-, from *ne ("not").
Click to learn more:
1/
'No', the opposite of 'yes', comes from West-Germanic *naiw ("never").
'No' as in 'no pain, no gain' arose as a variant of 'none' and stems from *nain ("not any").
They only share the n-, from *ne ("not").
Click to learn more:
1/
Reposted by Cameron R D Bunney
I wrote a blog post on how quaternions can be used to derive the equations of spherical geometry, as well as the sunrise equation relating the time of sunrise or sunset to one's latitude and the declination of the Sun. terrytao.wordpress.com/2024/12/19/q...
Quaternions and spherical trigonometry
Hamilton’s quaternion number system $latex {\mathbb{H}}&fg=000000$ is a non-commutative extension of the complex numbers, consisting of numbers of the form $latex {t + xi + yj + zk}&f…
terrytao.wordpress.com
December 19, 2024 at 5:38 PM
I wrote a blog post on how quaternions can be used to derive the equations of spherical geometry, as well as the sunrise equation relating the time of sunrise or sunset to one's latitude and the declination of the Sun. terrytao.wordpress.com/2024/12/19/q...
Reposted by Cameron R D Bunney
We are announcing the *Early Universe from Home 2025* conference, whose registration is now open. Please share with colleagues and collaborators
Registration for *Early Universe from Home 2025* is now open! (running 25-28 Feb)
It will be the best place to learn about and discuss...
- correlators
- phase transitions
- topological defects
- primordial black holes
- and other early structures.
earlyuniverse.cosmodiscussion.com
It will be the best place to learn about and discuss...
- correlators
- phase transitions
- topological defects
- primordial black holes
- and other early structures.
earlyuniverse.cosmodiscussion.com
Early Universe from Home
earlyuniverse.cosmodiscussion.com
December 19, 2024 at 4:12 PM
We are announcing the *Early Universe from Home 2025* conference, whose registration is now open. Please share with colleagues and collaborators
Reposted by Cameron R D Bunney
Registration for *Early Universe from Home 2025* is now open! (running 25-28 Feb)
It will be the best place to learn about and discuss...
- correlators
- phase transitions
- topological defects
- primordial black holes
- and other early structures.
earlyuniverse.cosmodiscussion.com
It will be the best place to learn about and discuss...
- correlators
- phase transitions
- topological defects
- primordial black holes
- and other early structures.
earlyuniverse.cosmodiscussion.com
Early Universe from Home
earlyuniverse.cosmodiscussion.com
December 19, 2024 at 7:49 AM
Registration for *Early Universe from Home 2025* is now open! (running 25-28 Feb)
It will be the best place to learn about and discuss...
- correlators
- phase transitions
- topological defects
- primordial black holes
- and other early structures.
earlyuniverse.cosmodiscussion.com
It will be the best place to learn about and discuss...
- correlators
- phase transitions
- topological defects
- primordial black holes
- and other early structures.
earlyuniverse.cosmodiscussion.com
Reposted by Cameron R D Bunney
#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...