Leonardo Petrillo
@92sciencemusic.bsky.social
Physicist (MSc in theoretical physics); scientific blogger (https://scienzaemusica.blogspot.com/); appreciator of music, especially classical-jazz. Expert and theorycrafter on some kinds of videogames, including Diablo, Hearthstone
🧪 🧵1/3 #OTD in 1912 the great English mathematician and computer scientist Alan Turing was born.
His immense scientific contributions, like the notion of Turing machine, made him the father of theoretical computer science and a hero for his crucial role in breaking the German Enigma code during WW2.
His immense scientific contributions, like the notion of Turing machine, made him the father of theoretical computer science and a hero for his crucial role in breaking the German Enigma code during WW2.
June 23, 2025 at 6:07 PM
🧪 🧵1/3 #OTD in 1912 the great English mathematician and computer scientist Alan Turing was born.
His immense scientific contributions, like the notion of Turing machine, made him the father of theoretical computer science and a hero for his crucial role in breaking the German Enigma code during WW2.
His immense scientific contributions, like the notion of Turing machine, made him the father of theoretical computer science and a hero for his crucial role in breaking the German Enigma code during WW2.
🧪⚛️ Gifted is a 2017 film directed by Marc Webb. It focuses on the story of a child prodigy, but above all on mathematics (in particular on the Navier-Stokes equations) and on some deep social themes. Here you can find my recent review: scienzaemusica.blogspot.com/2025/03/gift...
March 19, 2025 at 10:39 PM
🧪⚛️ Gifted is a 2017 film directed by Marc Webb. It focuses on the story of a child prodigy, but above all on mathematics (in particular on the Navier-Stokes equations) and on some deep social themes. Here you can find my recent review: scienzaemusica.blogspot.com/2025/03/gift...
🧪⚛️ One week ago I was discussing my MSc thesis. This is the celebration cake, which represents (as far as possible on a cake) the formula of the 1PR contribution to the H-E Lagrangian at two loops in the photon exchange case.
March 18, 2025 at 9:18 PM
🧪⚛️ One week ago I was discussing my MSc thesis. This is the celebration cake, which represents (as far as possible on a cake) the formula of the 1PR contribution to the H-E Lagrangian at two loops in the photon exchange case.
🧪⚛️ Update: yesterday the discussion went well...110 cum laude + direct compliments from the counter-rapporteur for the quality of the thesis! 🥳
Here you can find the complete slides of the presentation: docs.google.com/presentation...
Here you can find the complete slides of the presentation: docs.google.com/presentation...
March 12, 2025 at 3:25 PM
🧪⚛️ Update: yesterday the discussion went well...110 cum laude + direct compliments from the counter-rapporteur for the quality of the thesis! 🥳
Here you can find the complete slides of the presentation: docs.google.com/presentation...
Here you can find the complete slides of the presentation: docs.google.com/presentation...
🧪⚛️ The thesis is finally here! Tomorrow there will be the discussion. 🤞
March 10, 2025 at 7:30 PM
🧪⚛️ The thesis is finally here! Tomorrow there will be the discussion. 🤞
1/2 🧪 Happy #InternationalWomensDay. Exactly one year ago I wrote a blog post that starts with considerations about still actual social issues like gender equality, especially in STEM, "normality" concept used to discriminate people and the importance of diversity (including #LGBT and #Disability),
March 8, 2025 at 7:50 PM
1/2 🧪 Happy #InternationalWomensDay. Exactly one year ago I wrote a blog post that starts with considerations about still actual social issues like gender equality, especially in STEM, "normality" concept used to discriminate people and the importance of diversity (including #LGBT and #Disability),
🧪⚛️ I upload again the image of the 2/4 post since it doesn't look as good as it should (the original format seems not to be supported here).
December 19, 2024 at 8:58 PM
🧪⚛️ I upload again the image of the 2/4 post since it doesn't look as good as it should (the original format seems not to be supported here).
🧪⚛️ 3/4
Already in 1881 Michelson tried to measure the speed of light along different directions using an instrument he had designed himself: the Michelson interferometer.
However the precision of his first instrument was not enough to obtain irrefutable results.
Already in 1881 Michelson tried to measure the speed of light along different directions using an instrument he had designed himself: the Michelson interferometer.
However the precision of his first instrument was not enough to obtain irrefutable results.
December 19, 2024 at 8:36 PM
🧪⚛️ 3/4
Already in 1881 Michelson tried to measure the speed of light along different directions using an instrument he had designed himself: the Michelson interferometer.
However the precision of his first instrument was not enough to obtain irrefutable results.
Already in 1881 Michelson tried to measure the speed of light along different directions using an instrument he had designed himself: the Michelson interferometer.
However the precision of his first instrument was not enough to obtain irrefutable results.
🧪⚛️ 2/4
He is particularly famous for the Michelson-Morley experiment, which he conducted in 1887 together with E. W. Morley and demonstrated the independence of the speed of light with respect to the hypothetical “aether wind” (which does not exist).
He is particularly famous for the Michelson-Morley experiment, which he conducted in 1887 together with E. W. Morley and demonstrated the independence of the speed of light with respect to the hypothetical “aether wind” (which does not exist).
December 19, 2024 at 8:35 PM
🧪⚛️ 2/4
He is particularly famous for the Michelson-Morley experiment, which he conducted in 1887 together with E. W. Morley and demonstrated the independence of the speed of light with respect to the hypothetical “aether wind” (which does not exist).
He is particularly famous for the Michelson-Morley experiment, which he conducted in 1887 together with E. W. Morley and demonstrated the independence of the speed of light with respect to the hypothetical “aether wind” (which does not exist).
🧪⚛️ 🧵1/4
#OTD in 1852 the great physicist Albert Abraham Michelson was born.
He was awarded the Nobel Prize in physics in 1907 "for his optical precision instruments and the spectroscopic and metrological investigations carried out with their aid".
#OTD in 1852 the great physicist Albert Abraham Michelson was born.
He was awarded the Nobel Prize in physics in 1907 "for his optical precision instruments and the spectroscopic and metrological investigations carried out with their aid".
December 19, 2024 at 8:33 PM
🧪⚛️ 🧵1/4
#OTD in 1852 the great physicist Albert Abraham Michelson was born.
He was awarded the Nobel Prize in physics in 1907 "for his optical precision instruments and the spectroscopic and metrological investigations carried out with their aid".
#OTD in 1852 the great physicist Albert Abraham Michelson was born.
He was awarded the Nobel Prize in physics in 1907 "for his optical precision instruments and the spectroscopic and metrological investigations carried out with their aid".
🧪 I update also this thread with the visible animation, which shows the rotation of a Menger sponge.
December 17, 2024 at 2:54 PM
🧪 I update also this thread with the visible animation, which shows the rotation of a Menger sponge.
🧪 Ok, now you can see the animation. I didn't know I was supposed to upload this as a video on Bluesky in order to make the animation visible. Sorry.
December 16, 2024 at 8:58 PM
🧪 Ok, now you can see the animation. I didn't know I was supposed to upload this as a video on Bluesky in order to make the animation visible. Sorry.
🧪 A famous problem in calculus of variations, the brachistochrone problem, is determining the curve joining two given points A and B and along which a material point dropped from A reaches B in the shortest possible time.
You can read more in my blog post: scienzaemusica.blogspot.com/2014/10/il-p...
You can read more in my blog post: scienzaemusica.blogspot.com/2014/10/il-p...
December 16, 2024 at 8:36 PM
🧪 A famous problem in calculus of variations, the brachistochrone problem, is determining the curve joining two given points A and B and along which a material point dropped from A reaches B in the shortest possible time.
You can read more in my blog post: scienzaemusica.blogspot.com/2014/10/il-p...
You can read more in my blog post: scienzaemusica.blogspot.com/2014/10/il-p...
🧪⚛️ 🧵1/5
#OTD in 1923 the great British-American physicist Freeman John Dyson was born. He was an influential figure in several fields of physics and science, other than a brilliant science communicator.
#OTD in 1923 the great British-American physicist Freeman John Dyson was born. He was an influential figure in several fields of physics and science, other than a brilliant science communicator.
December 15, 2024 at 8:19 PM
🧪⚛️ 🧵1/5
#OTD in 1923 the great British-American physicist Freeman John Dyson was born. He was an influential figure in several fields of physics and science, other than a brilliant science communicator.
#OTD in 1923 the great British-American physicist Freeman John Dyson was born. He was an influential figure in several fields of physics and science, other than a brilliant science communicator.
🧪⚛️ 3/5
In his early career Sakharov was interested in nuclear physics, coordinating also a team that built in 1961 the thermonuclear Tsar Bomb, i.e. the most powerful nuclear weapon ever created and experimented.
In his early career Sakharov was interested in nuclear physics, coordinating also a team that built in 1961 the thermonuclear Tsar Bomb, i.e. the most powerful nuclear weapon ever created and experimented.
December 14, 2024 at 7:39 PM
🧪⚛️ 3/5
In his early career Sakharov was interested in nuclear physics, coordinating also a team that built in 1961 the thermonuclear Tsar Bomb, i.e. the most powerful nuclear weapon ever created and experimented.
In his early career Sakharov was interested in nuclear physics, coordinating also a team that built in 1961 the thermonuclear Tsar Bomb, i.e. the most powerful nuclear weapon ever created and experimented.
🧪⚛️ 🧵1/5
#OTD in 1989 the great Soviet physicist Andrei Dmitrievich Sakharov died.
He is known among the experts for his attempt to explain the baryon asymmetry (i.e. the imbalance between baryon matter and antimatter) of the universe proposing, in 1967, 3 conditions which take his name.
#OTD in 1989 the great Soviet physicist Andrei Dmitrievich Sakharov died.
He is known among the experts for his attempt to explain the baryon asymmetry (i.e. the imbalance between baryon matter and antimatter) of the universe proposing, in 1967, 3 conditions which take his name.
December 14, 2024 at 7:36 PM
🧪⚛️ 🧵1/5
#OTD in 1989 the great Soviet physicist Andrei Dmitrievich Sakharov died.
He is known among the experts for his attempt to explain the baryon asymmetry (i.e. the imbalance between baryon matter and antimatter) of the universe proposing, in 1967, 3 conditions which take his name.
#OTD in 1989 the great Soviet physicist Andrei Dmitrievich Sakharov died.
He is known among the experts for his attempt to explain the baryon asymmetry (i.e. the imbalance between baryon matter and antimatter) of the universe proposing, in 1967, 3 conditions which take his name.
🧪⚛️ 4/5
He was also interested in dig deep into the fascinating phenomenon of superconductivity (SC), giving birth for instance to the pseudospin approach to BCS theory, i.e. the key microscopic theory of SC which takes the name from the Nobel Prize laureate scientists Bardeen, Cooper, Schrieffer.
He was also interested in dig deep into the fascinating phenomenon of superconductivity (SC), giving birth for instance to the pseudospin approach to BCS theory, i.e. the key microscopic theory of SC which takes the name from the Nobel Prize laureate scientists Bardeen, Cooper, Schrieffer.
December 13, 2024 at 8:42 PM
🧪⚛️ 4/5
He was also interested in dig deep into the fascinating phenomenon of superconductivity (SC), giving birth for instance to the pseudospin approach to BCS theory, i.e. the key microscopic theory of SC which takes the name from the Nobel Prize laureate scientists Bardeen, Cooper, Schrieffer.
He was also interested in dig deep into the fascinating phenomenon of superconductivity (SC), giving birth for instance to the pseudospin approach to BCS theory, i.e. the key microscopic theory of SC which takes the name from the Nobel Prize laureate scientists Bardeen, Cooper, Schrieffer.
🧪⚛️ 🧵1/5
#OTD in 1923 the great American physicist Philip Warren Anderson was born. He won the Nobel Prize in Physics for his investigations into the electronic structure of magnetic and disordered systems that were fundamental for the development of memory devices in computers.
#OTD in 1923 the great American physicist Philip Warren Anderson was born. He won the Nobel Prize in Physics for his investigations into the electronic structure of magnetic and disordered systems that were fundamental for the development of memory devices in computers.
December 13, 2024 at 8:37 PM
🧪⚛️ 🧵1/5
#OTD in 1923 the great American physicist Philip Warren Anderson was born. He won the Nobel Prize in Physics for his investigations into the electronic structure of magnetic and disordered systems that were fundamental for the development of memory devices in computers.
#OTD in 1923 the great American physicist Philip Warren Anderson was born. He won the Nobel Prize in Physics for his investigations into the electronic structure of magnetic and disordered systems that were fundamental for the development of memory devices in computers.
🧪⚛️ 1/5 #OTD in 1882 the great German physicist Max Born was born. He was one of the most important contributors to the development of quantum mechanics. In particular, we owe him the statistical interpretation (dated 1926) of the wave function.
December 11, 2024 at 9:08 PM
🧪⚛️ 1/5 #OTD in 1882 the great German physicist Max Born was born. He was one of the most important contributors to the development of quantum mechanics. In particular, we owe him the statistical interpretation (dated 1926) of the wave function.
🧪 3/4 And also the Jacobian determinant (often called simply Jacobian), a fundamental math tool in coordinate transformations.
December 10, 2024 at 9:01 PM
🧪 3/4 And also the Jacobian determinant (often called simply Jacobian), a fundamental math tool in coordinate transformations.
🧪 2/4 Among other contributions, we remember the Jacobi identity, a very general algebraic identity involving commutators, that has applications even in the context of general relativity.
December 10, 2024 at 9:00 PM
🧪 2/4 Among other contributions, we remember the Jacobi identity, a very general algebraic identity involving commutators, that has applications even in the context of general relativity.
🧪 🧵1/4 #OTD in 1804 the great German mathematician Carl Gustav Jacob Jacobi was born. The range of his scientific contributions was very wide.
For instance, he published in 1829 a seminal treatise about the theory of elliptic function, so called because they derive from elliptic integrals. #math
For instance, he published in 1829 a seminal treatise about the theory of elliptic function, so called because they derive from elliptic integrals. #math
December 10, 2024 at 8:59 PM
🧪🔭 #OTD in 2018 the great astrophysicist Riccardo Giacconi died. His studies about X-Ray astronomy, that led to the discovery of cosmic X-ray sources, were so impactful that he was awarded the Nobel Prize in Physics in 2002. Here a nice post from ESO which remembers him: www.eso.org/public/italy...
December 9, 2024 at 8:11 PM
🧪🔭 #OTD in 2018 the great astrophysicist Riccardo Giacconi died. His studies about X-Ray astronomy, that led to the discovery of cosmic X-ray sources, were so impactful that he was awarded the Nobel Prize in Physics in 2002. Here a nice post from ESO which remembers him: www.eso.org/public/italy...
I think this is a great introductory book with a lot of stunning images.
December 8, 2024 at 9:27 PM
I think this is a great introductory book with a lot of stunning images.
🧪 #OTD in 1778 the French chemist and physicist Joseph Louis Gay-Lussac was born. He made relevant studies about the properties of gases, so that 2 famous laws are named after him. Here you can read more about his story and great scientific achievements: scienzaemusica.blogspot.com/2013/05/gay-...
December 6, 2024 at 6:53 PM
🧪 #OTD in 1778 the French chemist and physicist Joseph Louis Gay-Lussac was born. He made relevant studies about the properties of gases, so that 2 famous laws are named after him. Here you can read more about his story and great scientific achievements: scienzaemusica.blogspot.com/2013/05/gay-...