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String Pheno Seminars
Приєднався 16 чер 2020
This seminar series is designed to highlight the work of theorists early in their careers, in the broad topic of String Phenomenology. The talks are held virtually on Tuesdays, from 11 AM - 12 PM EST, in order to allow for maximum participation across the globe. All presentations will be by junior researchers who are not yet in permanent positions.
Talks will be given via Zoom and posted here on UA-cam.
Talks will be given via Zoom and posted here on UA-cam.
Antonia Paraskevopoulou - Emergence of R4 terms in M-theory
In its original formulation, the Emergence Proposal postulates that terms in the low-energy effective action are emerging after integrating out towers of states becoming exponentially light in asymptotic regions of the moduli space, in agreement with the Swampland Distance Conjecture. In this talk, I will motivate an M-theoretic refinement of the Emergence Proposal by revisiting the computation of a particular higher derivative coupling in toroidal compactifications of M-theory. On a technical level, our calculations rely on employing an appropriate regularization method and demonstrate that integrating out the full towers of light states is crucial for reproducing the known amplitudes.
Переглядів: 37
Відео
Giorgio Leone - Rigid Orientifold Vacua in 6d with Broken SUSY
Переглядів 42День тому
Brane Supersymmetry Breaking (BSB) is a phenomenon occurring in lower dimensional orientifold vacua in which supersymmetry is broken without admitting tachyonic instabilities. This feature is ascribed to the simultaneous presence of a tree-level supersymmetric closed string sector coupled with a non-supersymmetric open string one, which underlies a non-linear realisation of supersymmetry. After...
Stefano Lanza - Neural Network Learning and Quantum Gravity
Переглядів 11921 день тому
The landscape of low-energy effective field theories stemming from string theory is too vast for a systematic exploration. However, the meadows of the string landscape may be fertile ground for the application of machine learning techniques. In this talk, I will illustrate that Quantum Gravity effective field theories are naturally endowed with key statistical learnability properties due to the...
Joan Quirant - Massive spin-2 particles and the Swampland
Переглядів 6021 день тому
In this talk, we will study swampland constraints on massive spin-2 particles coupled to gravity. We will start by considering an effective theory (EFT) with a single (interacting) massive spin-2 particle and a gap to the cutoff. We will show that this theory can never be made consistent with the so-called Classical Regge Growth conjecture (CRG), therefore being in the swampland. We will then m...
Bernardo Fraiman - Rank Reduction in Non-Supersymmetric String Theories
Переглядів 63Місяць тому
The lack of experimental evidence for supersymmetry has recently fueled a resurgence of interest in non-supersymmetric heterotic strings. A detailed analysis was carried out on the possible gauge symmetries and the behavior of the one-loop potential for circle compactifications of these strings. However, no minima were found. Orbifold compactifications lead to theories with reduced-rank symmetr...
Lorenzo Paoloni - On the Moduli Space Curvature at Infinity
Переглядів 62Місяць тому
Moduli spaces are a key feature of String Compactifications and play a central role in the Swampland Programme. In this talk, I will analyse the scalar curvature of the vector multiplet moduli space of type IIA string theory compactified on a generic Calabi-Yau manifold. While the volume of this space is known to be finite, cases have been found where the scalar curvature diverges positively al...
Veronica Collazuol - A twist at infinite distance in the CHL string
Переглядів 41Місяць тому
In this talk, I will analyse a space-time algebra of BPS states that emerges in the infinite distance limit in the moduli space of the nine-dimensional CHL string as the theory decompactifies to the ten-dimensional E8×E8 heterotic string, and compare it with the heterotic case. As expected, we find an affine algebra, but in a twisted version.
Margherita Putti - Gravitational Axiverse Spectroscopy
Переглядів 70Місяць тому
Among various predictions of string compactifications, axions hold a pivotal role, as they provide a unique avenue to tie UV physics to experiments. Most experimental setups aim to detect a signal using the direct coupling between the axion and the Standard Model. However, string axions do not necessarily need to couple to the Standard Model directly. In this talk I will describe how inflationa...
Ignacio Ruiz - A Taxonomy of Infinite Distance Limits
Переглядів 2452 місяці тому
The Emergent String Conjecture constrains the possible types of light towers in infinite-distance limits in quantum gravity moduli spaces. In this talk we will explain how one can use these to put further restrictions on the convex hull of the scalar charge-to-mass vectors of these light towers, as well as the related convex hull that controls the asymptotic behavior of the species scale. Under...
David H. Wu - Species Scale in Diverse Dimensions
Переглядів 682 місяці тому
In a quantum theory of gravity, the species scale can be defined as the scale at which corrections to the Einstein action become important due to the fact that the inverse of the species scale gives us the smallest size black hole described by the EFT involving only the Einstein term. In this talk, I will demonstrate the validity of this picture in diverse dimensions and with different amounts ...
Björn Friedrich - End-of-the-World Branes in String Theory and their Implications in Cosmology
Переглядів 1372 місяці тому
The existence of end-of-the-world (ETW) branes allows for the appearance of two phenomena relevant in cosmology: The decay of universes to nothing and the creation of universes from nothing. In this talk, we discuss both the existence of ETW branes in string theory and their effects in cosmology. We explicitly construct an ETW brane for type IIB compactifications on Calabi-Yau orientifolds and ...
Ethan Torres - Generalized Symmetries, Gravity & the Swampland
Переглядів 802 місяці тому
In quantum gravity, it is generally expected that all global (generalized) symmetries are either gauged or broken. In this talk, I will discuss the UV fate of such global symmetries in the context of 7D and 5D vacua realized by compact Calabi-Yau spaces with localized singularities in M-theory. Conversely, I will also show how the emergence of (approximate) global symmetries in the IR coincides...
Calvin Yi-Ren Chen - Stacking and Balancing Casual Causality
Переглядів 2093 місяці тому
In recent years, causality has emerged as a powerful criterion to distinguish between “physical” and “unphysical” low-energy effective field theories (EFTs). A direct way to ensure a given EFT is causal is to demand a lower bound on scattering time delays, which essentially imposes a speed limit averaged over a trajectory. In flat space, this is unambiguously dictated by the Minkowski light con...
Gonzalo Villa - String Thermodynamics In & Out of Equilibrium: Boltzmann Equations and Random Walks
Переглядів 973 місяці тому
In this talk, we explore the Bolzmann equation approach to string thermodynamics and explore its inherent capability of studying out-of-equilibrium physics, with cosmological applications in mind. More concretely, after a short description of the phase space of string theory in a flat background, we consider the leading contribution to the decay and absorption rates of typical highly excited st...
Jesús Huertas - Aspects of Dynamical Cobordism in AdS/CFT
Переглядів 693 місяці тому
The cobordism conjecture implies that consistent theories of Quantum Gravity must admit the introduction of boundaries. In this talk, we will present the dynamical realization of the cobordism conjecture in type IIB in AdS5 × S5, using the existing gravity duals of 4d N=4 SYM with Gaiotto-Witten superconformal boundary conditions (near-horizon limits of D3-branes ending on NS5- and D5-branes). ...
Daniel Baldwin - Coulomb and Higgs Phases of G2-Manifolds
Переглядів 583 місяці тому
Daniel Baldwin - Coulomb and Higgs Phases of G2-Manifolds
Filippo Revello ‐ String Theory and the First Half of the Universe
Переглядів 1654 місяці тому
Filippo Revello ‐ String Theory and the First Half of the Universe
Hamza Ahmed ‐ T-duality and flavor symmetries of Heterotic Little String Theories (LSTs)
Переглядів 1294 місяці тому
Hamza Ahmed ‐ T-duality and flavor symmetries of Heterotic Little String Theories (LSTs)
Muthusamy Rajaguru - Moduli stabilization in type IIB models with h^{1,1}=0
Переглядів 585 місяців тому
Muthusamy Rajaguru - Moduli stabilization in type IIB models with h^{1,1}=0
Jeroen Monnee - Complexity of the Flux Landscape
Переглядів 2765 місяців тому
Jeroen Monnee - Complexity of the Flux Landscape
Alberto Castellano - A Universal Pattern in Quantum Gravity
Переглядів 1495 місяців тому
Alberto Castellano - A Universal Pattern in Quantum Gravity
Rafael Álvarez-García - The Distance Conjecture in F-theory via Semi-stable Degenerations
Переглядів 635 місяців тому
Rafael Álvarez-García - The Distance Conjecture in F-theory via Semi-stable Degenerations
Daniel Panizo - A cosmological excursion to dark bubbles
Переглядів 856 місяців тому
Daniel Panizo - A cosmological excursion to dark bubbles
George Tringas - On the robustness of scale-separated AdS4 from type IIA
Переглядів 526 місяців тому
George Tringas - On the robustness of scale-separated AdS4 from type IIA
Matilda Delgado - Emergence of Species Scale Black Hole Horizons
Переглядів 2266 місяців тому
Matilda Delgado - Emergence of Species Scale Black Hole Horizons
Salvatore Raucci - A first-order formalism for non-supersymmetric strings
Переглядів 676 місяців тому
Salvatore Raucci - A first-order formalism for non-supersymmetric strings
Matteo Licheri - Higher Derivative Corrections to String Inflation
Переглядів 906 місяців тому
Matteo Licheri - Higher Derivative Corrections to String Inflation
Nicolò Petri - Towards AdS Distances in String Theory
Переглядів 696 місяців тому
Nicolò Petri - Towards AdS Distances in String Theory
Carlo Branchina - UV-sensitivity in Kaluza Klein Theories: Naturalness and Dark Dimension
Переглядів 3277 місяців тому
Carlo Branchina - UV-sensitivity in Kaluza Klein Theories: Naturalness and Dark Dimension
Muldrow Etheredge - Dense Geodesics, Tower Alignment, and the Sharpened Distance Conjecture
Переглядів 867 місяців тому
Muldrow Etheredge - Dense Geodesics, Tower Alignment, and the Sharpened Distance Conjecture
🥰🍶🍵👌😁🪢🪢🪢
it is amazing that there are still people paid to live with this crap.
As a Hindu according to our mythology we believe everything is generated from a sound wave called " Omm " the Omm sign is - 🕉️ read our ancient mythology for more details
Thank you for the video.
Great talk!
(a late-time clarification on the question session, min. 32:56) quotes from hep-th/2209.11821: - "These will be the equations that, within our slow-roll approximation, describe the dynamics of our scalar fields", p. 5 - "it is enough to restrict to the slow-roll scenario for our purposes", p. 15 "slow roll", defined by the authors as neglecting the scalar-field kinetic-energy and second-derivative terms in p. 4, is not equivalent to accelerated expansion (this is just a one-sided implication). are they actually considering slow-roll? well so it seems. this is inconsistent for scaling cosmologies.
Love it.
she speaks language of gods
🤯
20:14, ua-cam.com/video/gP2PKE0e0Eg/v-deo.html, I meant to say "when you have superconductor gap \Delta_{SC}, you can solve the vortex subgap \Delta_{sub}.
23:05, ua-cam.com/video/gP2PKE0e0Eg/v-deo.html. I meant to say "in the so(10) grand unified theory alone with Spin(10) gauge group," I misspoke in "the GG alone" - which should be "in the so(10) grand unified theory alone." Thank you.
Lit !
i'm here
Jose Calderon Infante,es un orgullo que estes en la familia;sigue,sigue adelante Calderon Infante. Con gran resolucion y mentalidad clara ganaras culquier batalla.
nice video bro
Thanks for the visit