#JuanMaldacena Public #Lecture: The #Meaning of #Spacetime

"What is spacetime, exactly? And how does it impact our understanding of important phenomena in our #Universe?"

https://www.youtube.com/watch?v=DODp-ajPuU8&ab_channel=PerimeterInstituteforTheoreticalPhysics

#Science #Physics #Philosophy #PhilosophyOfScience #Cosmology #PhilosophyOfCosmology #Space #Time #GR #GeneralRelativity #QM #QuantumMechanics #QuantumFieldTheory #QuantumGravity #LoopQuantumGravity #BlackHoles #Entanglement #PerimiterInstitute

We are happy to announce that a new thematic programme with 5 focus weeks just got started at
@ESIVienna
! 🥳 Check out the details below ⏬

📅 31st July - 1st September 2023 📅
📌 Schrödinger Lecture Hall 📌

▫️ Programme description ▫️
https://esi.ac.at/events/e476/

📚 Subject: #QuantumFieldTheory at the Frontiers of the #StrongInteraction
📓Week 1: Finite-Mass and #Electroweak Effects in #gaugetheories
📕 Week 2: #Singularity Structure of Quantum Field Theory Beyond the Leading Power
📗 Week 3: #Factorization Violation and the #Space of Universal Functions
📘 Week 4: Simulation of the All Order Structure of Scattering Amplitudes
📙 Week 5: Multi-Variable Techniques for All Order Resummations in QFT

@univienna

How does #Hawking #Radiation REALLY work?

"Nothing can escape #BlackHoles, yet somehow they can lose #Mass by emitting #HawkingRadiation?!" - #TheScienceAsylum

https://www.youtube.com/watch?v=rrUvLlrvgxQ&ab_channel=TheScienceAsylum

#ScienceAsylum #NickLucid #Physics #Astrophysics #Conservation #Information #ConservationOfInformation #Energy #ConservationOfEnergy #QM #QuantumMechanics #QuantumPhysics #QFT #QuantumFieldTheory #FieldTheory #QuantumField #QuantumFields #Spacetime #VirtualParticles #Evaporation

Gravity is much weaker than electromagnetism but still essential to consider in condensed matter physics; but why?🤔

Learn about Luttinger's argument and discuss the gravitational bulk-boundary correspondence online at enabla.com/pub/1115/about 📜🎥

Revise the conformal and gravitational anomalies and explore the interplay between gravity and electromagnetism in the quantum Hall effect⚡️

All Enabla lectures are #free and #OpenAccess. If you like what we're doing, please support us by reposting, following this account, leaving some comments under this post & asking questions on #Enabla. Any of these actions help us a lot; thank you!🙏

#QFT #QuantumFieldTheory #Gravity #CondensedMatter #Quantum #Physics #PhD

The one-semester-long introductory #QFT course by Prof. Partha Mukhopadhyay has come to an end, and all the video lectures are now available at https://enabla.com/set/173 🎥

Follow the insightful approach inspired by Dirac & Feynman and discover path integrals, world-line theory, Feynman diagrams, renormalization techniques, and more!🔥

Don't miss the unique #free opportunity to learn from experts: ask Prof. Partha Mukhopadhyay your questions here or on #Enabla via in-time threads, and enhance your understanding of the crucial theoretical #physics concepts of the #QuantumFieldTheory 😎

All Enabla lectures are #OpenAccess. Please support us by sharing this post, following our account & asking questions on Enabla. Thank you!🙏

Following on the Monday tweet, we invite everyone to explore the concluding lecture on renormalization techniques in #QFT at https://enabla.com/pub/1110/about 🎥

Don't be shy: ask
Prof. Partha Mukhopadhyay online or join existing in-time threads like https://enabla.com/en/pub/1066/thread/186 for more insights🔥

Abstract: Following up on the discussion in the previous two chapters, various interesting aspects of QFT in general emerge which we explain and explicitly demonstrate using the current example. These are renormalised couplings and renormalised 1PI vertices, running of them with the scale and renormalisation prescription. The latter basically allows one to relate the mathematical objects we calculate and the observable quantities we measure. Finally, we consider various scenarios of asymptotic behaviour of the coupling as a function of the scale and touch upon the ideas of quantum triviality, UV and IR fixed points and asymptotic freedom. We end our discussion by deriving the “Renormalisation Group Equation” for 1PI vertices and an expression for their anomalous mass dimension.

All Enabla lectures are #free & #OpenAccess. Please support us by sharing this post, following our account & asking questions on Enabla. Thank you!🙏

#QuantumFieldTheory #renormalization #Quantum #Physics #PhD #Lecture

💡Regularization and renormalization techniques are crucial for understanding fundamental interactions in theoretical #physics.

Learn about handling UV divergences and discuss theories' renormalisability with
Partha Mukhopadhyay from The Institute of Mathematical Sciences, Chennai, at https://enabla.com/pub/1104/about 🎥

Abstract: we introduce the general theme of counter-term renormalisation programme which is an approach to make sense of the UV divergences observed in the previous chapter https://enabla.com/set/173/pub/682/about. In this approach one regularises the divergences, a process that introduces a scale in the problem, and then adds counter terms to the original Lagrangian to absorb the divergences in the physical limit. Based on the patterns of divergences depending on the mass dimension of the coupling, three categories of theories emerge: super-renormalisable, renormalisable and non-renormalisable theories. In our explicit demonstration, we consider dimensional regularisation and calculate certain example integrals whose results will be crucial in the analysis of the next chapter.

All Enabla lectures are #free & #OpenAccess. Please support us by sharing this post, following our account & asking questions on Enabla. Thank you!🙏

#QuantumFieldTheory #QFT #renormalization #regularization #QuantumPhysics #PhD #Lecture

🤔Did you know global anomalies in topological superconductors show a different topological invariant from the Altland-Zirnbauer classification? Find out why at https://enabla.com/pub/1111/about 📜🎥 and discuss our new #QFT in #CondensedMatter lecture with its authors🤩

Abstract: In this class, we finish the discussion about global anomalies, discussing global anomalies in topological superconductors. Interestingly, the studies of global anomalies in these materials show a different topological invariant from the Altland-Zirnbauer classification. To understand why, we consider the effect of interactions in topological superconductors, showing that the presence of interactions that respect the symmetry can change the topological class, but this is encoded correctly in the anomalies. Further, we discuss the change of the partition functions when using different frames to describe a Chern-Simons term, what gives rise to the framing anomaly.

All Enabla lectures are #free & #OpenAccess. Please support us by sharing this post, following our account & asking questions on Enabla. Thank you!🙏

#QuantumFieldTheory #Superconductors #Topology #TopologicalSuperconductors #TopologicalMaterials #Physics #Science #Lecture #OpenScience #OpenEducation

⚡️Welcome to the world of l⦵⧂p diagrams!👻 Explore Feynman and Schwinger parametrizations, uncover the mysteries of UV divergences, and learn about the superficial degree of divergence!

🤔Curious? Chat with Partha Mukhopadhyay from The Institute of Mathematical Sciences, Chennai, at https://enabla.com/pub/682/about 🎥

Abstract: Having developed the diagrammatics in detail, we now address the problem of explicitly computing the diagrams. The study is facilitated by introducing Feynman and Schwinger parametrization of the loop integrands. We argue that generically loop diagrams are fraught with UV divergences coming from large values of the loop momenta. Typically the diverging contribution comes from a “region of coincidence” where all the vertices associated to the loop coincide in position space. Next we introduce a key concept called superficial degree of divergence. We explain what is superficial about it and then state and outline the proof of Weinberg’s theorem associated with it. This allows us to explore the pattern in which divergences appear for power law potentials depending on the mass dimension of the coupling.

All Enabla lectures are #free & #OpenAccess. Please support us by sharing this post, following our account & asking questions on Enabla. Thank you!🙏

#QuantumFieldTheory #QFT #Feynman #Schwinger #LoopDiagrams #FeynmanDiagrams #Physics #Lecture

More on #QuantumFieldTheory anomalies in #topological #insulators😎 Learn about the non-perturbative global anomalies in 3D and discuss their connection to topological states in 4D at https://enabla.com/pub/1105/about; the video lecture is supplemented by carefully-crafted lecture notes🔥

The anomalies we studied so far manifested themselves as non-conserved currents, corresponding to gauge non-invariance of the partition function in the presence of background fields. We showed that the anomalies in 2D signal the existence of topological states in 3D, the connection being the symmetry restoration due to the flow of a conserved quantity from bulk to edge. It is natural to ask if there is a similar connection between a topological state in 4D and an anomaly in 3D, but this does not seem likely, since the anomalies we discussed so far are present only in even D. It turns out, however, that there is a different class of anomalies that do appear in odd dimensions. In this class, we discuss global anomalies, which are associated with a change of the partition function over global gauge transformations. We first discuss how a Chern-Simons action can be non-invariant under a global gauge transformation if it has non-integer level. We then return to the edge theory of a topological insulator and understand whether the system is invariant or not under this transformation. Studying the index theorem in a system with a boundary, we understand that neither the bulk nor the edge is invariant in isolation, so we need both to have a consistent theory.

Our lectures are #free & #OpenAccess; the easiest way for you to support our project is to share this post, follow our account, and ask a few questions on Enabla. Thank you!🙏

The exact evaluation of #QuantumFieldTheory path integrals can be tricky; this is why it is so important to master #perturbative methods.

Do it now and discuss in detail the loop expansion and #Feynman rules together with Partha Mukhopadhyay from The Institute of Mathematical Sciences, Chennai at https://enabla.com/pub/962/about

Our lectures are #free & #openaccess; the easiest way for you to support our project is to share this post, follow our account, and ask a few questions on Enabla. Thank you!🙏

Lately, there has been quite a lot of advanced #QFT stuff, yeah? How about revisiting the basics?😉

Embrace the first lecture of the detailed #QuantumFieldTheory course by Partha Mukhopadhyay from the Chennai Mathematical Institute. Don't be shy: watch the videos & ask your questions at https://enabla.com/pub/1066/about

All our lectures are #free and #openaccess; the easiest way for you to support our project is to share this post, follow our account, and ask a few questions on Enabla. Thank you!🙏

I'll be talking about how one gets standard #QuantumFieldTheory out of the non-linear full Lagrangian of entangled relativity at the 57th Rencontres de Moriond.

I hope to see you there!

https://moriond.in2p3.fr/2023/Gravitation/gravitation-agenda.html

We continue talking about the #QuantumFieldTheory #Anomalies with the #OpenAccess lecture on #Weyl #Semimetals. Learn about #Topological #QFT, Dirac materials, and mixed anomalies, and discuss what is left unclear with the authors and our community at https://enabla.com/set/153/pub/1071/about

Our #OpenAccess #QFT #Anomalies in #CondensedMatter #Physics course already includes five lectures and counting🔥 Hans & Rodrigo from #StockholmUniversity & #UppsalaUniversity are doing fantastic work posting videos & lecture notes, and they are waiting for your curious questions to help you better grasp the materials at https://enabla.com/set/153🤓

#QuantumMechanics #QuantumFieldTheory #ConformalFieldTheory #Topology #Symmetry #SymmetryBreaking

"[W]e must turn our attention to the realm of quantum field theory, and to the special place the Higgs boson calls home, the Higgs field. Along the way, we’ll see how the relationship between quantum fields and the basic physical property of quantum spin can help us better understand the nature of our universe. And why finding the Higgs is far from the end of the story."

https://www.symmetrymagazine.org/article/what-the-higgs-boson-tells-us-about-the-universe

#Physics #Particles #QuantumFieldTheory #HiggsBoson

Quantum Particles Aren’t Spinning. So Where Does Their Spin Come From?

#physics #electrons #QuantumFieldTheory #spin

https://www.scientificamerican.com/article/quantum-particles-arent-spinning-so-where-does-their-spin-come-from/

First of: what are the motivations to modify GR? There are several, and no one agrees on which are the most important ones. You probably often hear that the biggest puzzle in Physics is the fact that we do not know roughly 95% of the content of the universe. While this may be true, it may also not have anything to do with gravity per se. For instance, it could be an issue with #QuantumFieldTheory on curved #spacetime, or due to an incompletion of the standard model of particles. 2/N

David Tong's lecture on quantum fields, available on the Royal Institution's YouTube channel.

https://www.youtube.com/watch?v=zNVQfWC_evg

#QuantumMechanics
#QuantumFields
#QuantumFieldTheory

The #HiggsMechanism Explained.

https://www.youtube.com/watch?v=kixAljyfdqU&ab_channel=PBSSpaceTime

#Physics #Science #Higgs #HiggsField #Hypercharge #WeakHypercharge #Chirality #Mass #PeterHiggs #QFT #QuantumFieldTheory