נובמבר 25, 2014
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Date:25שלישינובמבר 2014הרצאה
COLOR STRUCTURES FOR SCATTERING AMPLITUDES
More information שעה 10:30מיקום Neve Shalomמרצה BARAK KOL
HEBREW UNIVERSITYמארגן המחלקה לפיסיקה של חלקיקים ואסטרופיסיקה
High Energy Theory Joint Seminarצרו קשר פרטים נוספים Show full text description of 10:20 Gathering and coffee...» 10:20 Gathering and coffeeתקציר Show full text abstract about Perturbative gauge theory is currently making fascinating fa...» Perturbative gauge theory is currently making fascinating fast-pace progress, known as "scattering amplitudes". The first step in determining Yang-Mills scattering amplitudes is the separation of color and kinematics leading to the definition of color-ordered sub-amplitudes. We gain new insight into color structures through the role of the shuffle and split operations on the algebra of words made of the color alphabet. Then we formulate a novel question about the transformation of color structures under permutations, and we find the full answer for tree level and 1-loop. We discuss implications for sub-amplitudes. It is amusing to note that new insights and results were achieved even in such a heavily studied topic. -
Date:25שלישינובמבר 2014הרצאה
Chemical Physics Guest Seminar
More information שעה 11:00כותרת All for one and one for all: interplay of the excess charge in molecular anionsמיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Dr Shachar Klaiman
University of Heidelberg, Germanyמארגן המחלקה לפיסיקה כימית וביולוגיתצרו קשר תקציר Show full text abstract about Molecular anions are of fundamental importance and ubiquitou...» Molecular anions are of fundamental importance and ubiquitous in many chemical, physical and biological environments. The chemical and physical properties of anions are very different from their neutral or cationic counterparts making them interesting species to study and characterize. While it is straightforward to assert that excited states of the anion play a crucial role in the electron accepting capabilities of the neutral molecules, electronically stable excited states of anions are thought to be scarce at best.
Following an overview of the special characteristic of molecular anions, we shall present our study of the electronically bound spectrum of the anion. Much like the neutral fullerene, the anion possesses certain unique properties which have attracted a great deal of research. One of these special properties, only recently fully uncovered, is that the anion supports a substantial number of electronically stable excited states in contrast to other molecular anions with comparable electron affinity. In this work, we clarify how the anion can support so many stable states by analyzing the radial and angular distributions of the excess electron bound to the anion. The analysis is based on ab initio calculations which are by far the most accurate on the anion to date. Surprisingly, the radial distributions are highly similar for states of very different binding energies and the analysis stresses the importance of angular correlation in binding the excess electron.
We further analyze the effect of the single excess electron on the electrons of the underlying neutral molecule. We demonstrate how this substantially modifies the actual distribution of the excess charge by shifting the underlying electron density. Finally, the effect of the perturbation of the anionic states in the presence of incarcerated atoms within the carbon shell is analyzed and discussed.
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Date:25שלישינובמבר 2014הרצאה
"From Walking Crowns and Switchable Rotaxanes on Surfaces to Logics with Gels"
More information שעה 11:00 - 12:00מיקום בניין הלן ומילטון קימלמןמרצה Prof. Christoph Schalley
Freie Universitat Berlinמארגן המחלקה לכימיה מולקולרית ולמדע חומריםצרו קשר -
Date:25שלישינובמבר 2014הרצאה
Grant presentation on Analysis, Design & Experimental Evolution of Novel Carbon Fixation Pathways
More information שעה 11:15מיקום בניין אולמן למדעי החייםמרצה Prof. Ron Milo
Department of Plant and Environmental Sciences, WISמארגן המחלקה למדעי הצמח והסביבהצרו קשר -
Date:25שלישינובמבר 2014הרצאה
TWO BODY SCATTERINGS AND DUALITY IN CHERN-SIMONS VECTOR MODELS
More information שעה 12:00מיקום Neve Shalomמרצה SHUICHI YOKOYAMA
TECHNIONמארגן המחלקה לפיסיקה של חלקיקים ואסטרופיסיקה
High Energy Theory Joint Seminarצרו קשר תקציר Show full text abstract about A scattering amplitude of elementary fields is a basic objec...» A scattering amplitude of elementary fields is a basic object to understand important physics not only in particle physics but also in a general quantum field theory (QFT), such as crossing symmetry and unitarity. In this talk I will talk about two body scattering amplitudes in Chern-Simons vector models, in which there has been a big progress recently. One of novel interesting phenomena discovered in this class of QFTs is non-supersymmetric duality. A main goal of this talk will be to explain our conjectural answer of the two body scatterings, which encode non-SUSY duality as well as crossing symmetry and unitarity. -
Date:25שלישינובמבר 2014הרצאה
Neural Correlates of Multisensory Plasticity
More information שעה 12:30מיקום אולם הרצאות ע"ש גרהרד שמידטמרצה Dr. Adam Zaidel
Gonda Multidisciplinary Brain Research Center Bar Ilan Universityמארגן המחלקה למדעי המוחצרו קשר תקציר Show full text abstract about The ability of the brain to processes and adapt multiple sou...» The ability of the brain to processes and adapt multiple sources of information dynamically, underlies its adept capacity for perception, decision making and action. In this talk, I shall present recent findings of multisensory (visual-vestibular) calibration in behaving monkeys and its neural correlate. Two mechanisms of multisensory calibration were found: i) in the absence of external feedback, “unsupervised” calibration reduces cue conflict by shifting the cues towards one another, and ii) “supervised” calibration reduces conflict with external feedback, by shifting the cues together, in the same direction. Strikingly, supervised calibration can cause an initially accurate cue to shift away from feedback, becoming less accurate. A computational model in which supervised and unsupervised calibration work in parallel, where the former only relies on the multisensory percept, but the latter calibrates cues individually, accounts for the observed behavior. Intriguingly, multisensory tuning curves in the ventral intraparietal (VIP) area shift together with behavioral calibration. While unsupervised calibration likely represents an implicit shift in perception, supervised calibration may incorporate higher level, more explicit, control of multisensory processing. -
Date:25שלישינובמבר 2014אירועי תרבות
מנחה מוזיקלית
More information שעה 12:30 - 13:30כותרת שיר למכשירמיקום אולם ע"ש דולפי ולולה אבנרצרו קשר פרטים נוספים Show full text description of דואטים של הנרי פרסל על אהבה , פוליטיקה , יין, זקנה וגם שיר ש...» דואטים של הנרי פרסל על אהבה , פוליטיקה , יין, זקנה וגם שיר שהוא חידה על מכשיר מעבדה מופלא
יעלה אביטל , סופרן
אהוד שפירא , בס
יזהר קרשון , צ'מבלו -
Date:25שלישינובמבר 2014הרצאה
“Fidelity of Translation: Universal Pathway of Editing Reactions”
More information שעה 14:00 - 15:00מיקום בניין הלן ומילטון קימלמןמרצה Prof. Mark Safro
Department of Structural Biology WISמארגן המחלקה לביולוגיה מבנית וכימיתצרו קשר -
Date:25שלישינובמבר 2014הרצאה
The Brain’s Gatekeeper: New Approaches to Study the Formation and Function of the Blood Brain Barrier (BBB)
More information שעה 15:00 - 16:00מיקום בניין ארתור ורושל בלפר למחקר ביורפואימרצה Ayal Ben-Zvi
Developmental Biology and Cancer Research Faculty of Medicine The Hebrew University of Jerusalemמארגן המחלקה למדעים ביומולקולרייםדף בית צרו קשר