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Hello, I'm Oveis Sheibani, a physics researcher interested in the history of science. Physics has developed through the efforts of many individuals over time. Our understanding of the cosmos and nature's laws has grown-from discovering subatomic structures to exploring the universe on large scales. I also create physics courses, using digital tools like a personal radio station. Welcome to Oveis Visual Radio.
Quantum field theory 8
In this video we discuss the Quantization of the Dirac field and the anti-commutation algebra in the Dirac field. This algebra lead to the concept of Pauli exclusion principle. A principle to explain the stability of the atoms and basically our world around us. The spin and statistics are two concepts that are seems to be very different in the first look but these two are connection through the algebra of the Dirac field. Half spin particles are fermions and described by Dirac equation which needs anti commutation in order to preserve the energy of the system within the positive bound.
Просмотров: 115
Видео
How was the charge of the electron measured ?
Просмотров 1,8 тыс.14 дней назад
The electron is one of the fundamental particles, and its properties are essential to life and our interactions with the world around us. Two of its key characteristics are its mass and charge. In the early 20th century, physicists measured the charge-to-mass ratio (e/m) of the electron, and by calculating its charge, they were able to accurately determine its mass. Robert Millikan, an experime...
رابرت میلیکان چگونه بار الکترون را اندازه گرفت ؟
Просмотров 14714 дней назад
الکترون یکی از مهم‌ترین ذرات بنیادی است که حیات ما و نحوه تعامل ما با دنیای اطراف به ویژگی‌های خاص آن وابسته است. دو ویژگی اصلی الکترون، جرم و بار آن هستند. در اوایل قرن بیستم، دانشمندان با اندازه‌گیری نسبت بار به جرم الکترون (e/m) و سپس محاسبه بار آن، توانستند جرم این ذره را نیز به دقت تعیین کنند. رابرت میلیکان، فیزیکدان تجربی آمریکایی، در سال 1909 با آزمایش قطره روغن توانست بار الکترون را با ...
Quantum field theory 7, angular momentum and Manifolds
Просмотров 6002 месяца назад
Quantum field theory 7, angular momentum and Manifolds
Quantum field theory 6, Solutions to Dirac equation, Spinor representation of Boost
Просмотров 2972 месяца назад
Quantum field theory 6, Solutions to Dirac equation, Spinor representation of Boost
Quantum field theory 5: Dirac equation and spinor
Просмотров 853 месяца назад
In this video we review the concept of Dirac field and Dirac algebra, the concept of spinor and generalized Lorentz transformation in the spinor representation are discussed.
Quantum field theory 4, Causality in quantized Klein Gordon field
Просмотров 975 месяцев назад
In this video, we discuss the time evolution of the Klein-Gordon field using initial snapshots and Hamiltonian dynamics. We'll address how to ensure causality in the quantized field, focusing on the behavior of time-like and space-like events. For time-like events, influences within the light cone are allowed, while for space-like events, the commutator vanishes to prevent faster-than-light int...
Electron Discovery
Просмотров 3285 месяцев назад
In this video, we begin with Geissler's gas discharge experiments, which laid the groundwork for understanding electrical conductivity in gases. Next, we explore Philip Lenard's work, demonstrating that cathode rays could penetrate thin metal foils, suggesting they were particles. Following this, we discuss Crookes' experiments with cathode rays, showing their deflection by magnetic fields and ...
Quantum field theory 3, Quantization of the field
Просмотров 1196 месяцев назад
Quantization is the process of converting a classical physical theory into a quantum one, transitioning from continuous classical variables to discrete quantum variables. In quantum mechanics, this involves promoting classical observables to operators on a Hilbert space and imposing commutation relations. Diagonalization, finding a basis where an operator like the Hamiltonian is diagonal, simpl...
Quantum field theory 2, Neothers's theorem and symmetry
Просмотров 123Год назад
In this video, we will explore the fundamentals of the Klein-Gordon field, the most basic type of scalar field. We'll also delve into its complex variant. Following the introduction of this field, we will examine Noether's theory, which links each system symmetry to the conservation of charged currents. Finally, we will apply these principles to the Klein-Gordon field, synthesizing the concepts...
Quantum field theory 1, Introduction
Просмотров 429Год назад
Quantum field theory (QFT) is the approach that combines the field description with the quantum description. It is an abstract way to express physical entities in space and time. At its core, QFT is capable of integrating relativity and a variable number of particles into a single unified framework. Furthermore, QFT provides methods to calculate the relative ratios of all possible processes. On...
How did the chemists see atoms 100 years before the physicists?
Просмотров 146Год назад
This is not the first time that we guessed about something and discovered it 100 years later, Science is a path of patience and delicate progess. A lot of time things emerge indirectly from other observation. Like the existence of atoms was revealed to chemists at the beginning of 19th century. It took 100 years for us to somehow directly observe atoms in physical sense.
داستان نظریه نسبیت خاص
Просмотров 154Год назад
نسبی بودن گذر زمان یعنی چه ؟ چطور میشه که زمان میتونه نسبی باشه ؟ داستان پشت نظریه نسبیت چیه ؟ نور چه ارتباطی به زمان داره ؟ نسبیت کلاسیک با نسبیت اینشتین چه تفاوت هایی داره ؟ در این ویدئو مختصر نگاهی داریم به تاریخچه تکوین نظریه نسبیت خاص. در آینده امیدواریم بیشتر بتونیم این موضوع رو بسط بدیم.
Wave-particle duality or how I learned to stop worrying about paradoxes and love quantum mechanics.
Просмотров 156Год назад
Part 1: In this video, we review three paradoxes that made us re-wire our logic. Particles and waves were two well discovered area of physics at the end of 19th century but when putting them together, at the level we needed the quantum precision, paradoxes raised by classical assumptions. 1. Electron in orbital motion around proton 2. BlackBody radiation and paradox of ultraviolet catastrophe 3...
physics = awesome
True
Thank you so much for insightful contents!
Thank you for your fantastic effort!
Useful and interesting. Thanks.
Thanks a lot for watching the video !
I would have been there in any time in between 1600 and 1950, I would have contributed atleast to some extent in science and technology, my name would have been there in History.
Me too.
Genius thumbnail mate
wow, always wondered how this could be measured. Now I know: Imagination combined with deep understanding of all rules. wow, wow, wow
Happy if you enjoy the video. Thank you!
Awesome video
Thanks a lot!
Cool!
Thanks !
Thank you for this beautiful episode!
Thanks a lot
I hope you produce more of these scientific contents!
Insightful Content!
Fantastic Job! I enjoyed it!
You started out fine but halfway through you began to talk to yourself ..
I am sorry if it got bring at some point. My main goal is be myself and try to say what I also understand truly. I can see it might be boring. I am practicing to produce courses like this in physics and this my first experience. I will try to improve, and also I have to thank you a lot for watching this video and leaving me a comment. do my best to address this problem.
Very nice Dr. Sheibani … love you man and stay awesome! 😊
Thank you so much for the motivations and following these videos. Appreciate a lot !
"Electricity and Matter" by J. J. Thomson is a great read.
yess, true !
"Electricity and Matter" by J. J. Thomson is a great read.
Thomson was also Ernest Rutherford's mentor, another great discovery.
Thanks for watching the video !
Please remove and then reupload these videos. They appear in the wrong order in the playlist. Thank you!
Thanks a lot for reminding me and also for following the videos. I fix the order in the playlist.
@@OveisVisRadio , Thank you!
بسیار عالی ..سوالی همواره در تخیلم دارم که سعی کردم از خیلی‌ها بپرسم ولی هرگز جواب نگرفتم امیدوارم شما کامنت من را ببینید وپاسخ دهید...فرض کنیم از منبع نوری ثابت پرتو نوری به سوی سه ناظر که در یک مکان مساوی با منبع قرار گرفتند ارسال میشود هم زمان یکی از ناظرها به سمت منبع حرکت میکند یکی ثابت میماند ویکی دیگر همزمان با همان مقدار سرعت مثلا یک هزارم سرعت نور دور میشود... تا جایی که من فهمیدم سرعت نور برای هر سه میبایست یکسان باشد ...آن ناظر که ثابت میماند که هیچ با سرعت ثابت پرتو نور را مشاهده میکند ..آن ناظر که دور میشود را هم میتوانم درک کنم که چون در حرکت است زمان برایش کند تر میگذرد میتوانم تصور کنم که به علت کندی زمان نور مسافت بیشتری میپیماید وبه ناظر دورشونده همزمان با ناظر ثابت میرسد یعنی به همان مقدار زمانش کند تر سپری میشود...اما هرگز نفهمیدم آن ناظر که خودش با سرعت ثابتی به منبع نور نزدیک میشود و همزمان با دیگر ناظر ها پرتو نور را مشاهده میکند. زمان برایش چگونه میگذرد ؟؟؟ با توجه با اینکه پرتو نور مسافت کمتری را طی میکند.سپاسگذارم اگر پاسخ دهید منت بر سرم میگذارید
👍👍
Thank you for the video ... I've had a "Love & Hate" relationship with this bitterly delicious subject, but I finally conquered it and moved on to higher topics ... always follow the "right" resources ... This is a very tricky subject if you really want to learn & master it!
Thanks you so much for watching the videos. I really appreciate that. Yea, this is a tricky topic. It took me a few years of thinking to understand it but worth it
Thank you for the video. I found it educational, well-presented, and particularly fun! To quote Richard Feynman: “I think I can safely say that nobody understands quantum mechanics.” ... So, like the title suggests, let's stop worrying about the strangeness of QM, love it, and unmask its many intricate mysteries ... Let's!!!
Thanks again for watching this channel. These videos are super amateur but I will try to improve them. Your supports means a lot to me ! Thanks a lot
The ultimative stationary reference is the observer system!
Can you explain more what you mean by observer system and ultimate stationary? As far as I got there is no ultimate reference, all references going with constant speed relative to each other are equivalent.
@@OveisVisRadio - are the observer x in motion or at rest? To another observer y (x and y are in mutual motion), x tells us 1) x is at rest/y is in motion 2) x is in motion/y is at rest. Now, y tell us 3) y is at rest/x is in motion, 4) y is in motion/x is at rest. - 2) and 4) are incorrect, as the observer is always at rest. Only 1) and 3) are experimentally correct.
I didn't understand much because of the language But I like your interest in philosophy
We need to continue completing the story Bravo 👏