High Energy Physics

Displaying 1609 - 1620 of 3065

M-strings and their orbifolds

Babak Haghighat Harvard University
May 20, 2014

PIRSA:14050005
High Energy Physics
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

Shiraz Minwalla Tata Institute of Fundamental Research (TIFR)
May 13, 2014

PIRSA:14050006
High Energy Physics
New strong interactions and the t t-bar asymmetry

Joachim Brod University of Cincinnati
May 13, 2014

PIRSA:14050092
High Energy Physics
Anomalies of discrete symmetries and Symmetry Protected Topological Phases

Anton Kapustin California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
May 06, 2014

PIRSA:14050035
High Energy Physics
Noncommutative geometry and the symmetries of the standard model

Fedele Lizzi University of Naples Federico II
May 06, 2014

PIRSA:14050031
High Energy Physics

Astrophysics
Probing renormalization group flows using entanglement entropy

Mark Mezei Massachusetts Institute of Technology (MIT)
April 30, 2014

PIRSA:14040144
High Energy Physics
Localizing Braneworlds in Infinite Spaces

Kellogg Stelle Imperial College London
April 29, 2014

PIRSA:14040064
High Energy Physics
3d N = 4 Gauge Theories, Mirror Symmetry and Hilbert series

Noppadol Mekareeya Imperial College London
April 28, 2014

PIRSA:14040143
High Energy Physics
Causality constraints in gravitational theories
April 22, 2014

PIRSA:14040116
High Energy Physics
Boson Tagging with Wavelets

William Shepherd University of California System
April 15, 2014

PIRSA:14040063
High Energy Physics
New Exact Results in Calabi-Yau, D-branes, and Orientifolds

Sungjay Lee University of Cambridge
April 15, 2014

PIRSA:14040081
High Energy Physics
RG flows with N=1 supersymmetry

Henriette Elvang University of Michigan–Ann Arbor
April 01, 2014

PIRSA:14030074
High Energy Physics

M-strings and their orbifolds

Babak Haghighat Harvard University
May 20, 2014

PIRSA:14050005
High Energy Physics
We consider M-theory in the presence of M parallel M5-branes probing a transverse A_{N-1} singularity. This leads to a superconformal theory with (1,0) supersymmetry in six dimensions. We compute the supersymmetric partition function of this theory on a two-torus, with arbitrary supersymmetry preserving twists, using the topological vertex formalism. Alternatively, we show that this can also be obtained by computing the elliptic genus of an orbifold of recently studied M-strings. The resulting 2d theory is a (4,0) supersymmetric quiver gauge theory whose Higgs branch corresponds to strings propagating on the moduli space of SU(N)^(M-1) instantons on R^4 where the right-moving fermions are coupled to a particular bundle.
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

Shiraz Minwalla Tata Institute of Fundamental Research (TIFR)
May 13, 2014

PIRSA:14050006
High Energy Physics
We present explicit computations and conjectures for 2 → 2 scattering matrices in large N U(N) Chern-Simons theories coupled to fundamental bosonic or fermionic matter to all orders in the ’t Hooft coupling expansion. The bosonic and fermionic S-matrices map to each other under the recently conjectured Bose-Fermi duality after a level-rank transposition. The S-matrices presented in this paper may be regarded as relativistic generalization of Aharonov-Bohm scattering. They have unusual structural features: they include a non analytic piece localized on forward scattering, and obey modified crossing symmetry rules. We conjecture that these unusual features are properties of S-matrices in all Chern-Simons matter theories. The S-matrix in one of the exchange channels in our paper has an anyonic character; the parameter map of the conjectured Bose-Fermi duality may be derived by equating the anyonic phase in the bosonic and fermionic theories.
New strong interactions and the t t-bar asymmetry

Joachim Brod University of Cincinnati
May 13, 2014

PIRSA:14050092
High Energy Physics
The CDF and D0 experiments at Tevatron measure a top-quark forward-backward
asymmetry significantly larger than the standard-model prediction.
We construct a model that involves new strong interactions at the electroweak scale
and can explain the measured asymmetry. Our model possesses a flavor symmetry
which allows to evade flavor and collider constraints, while it still permits flavor-violating
couplings of order 1 which are needed to generate the asymmetry via light t-channel vectors.
Anomalies of discrete symmetries and Symmetry Protected Topological Phases

Anton Kapustin California Institute of Technology (Caltech) - Division of Physics Mathematics & Astronomy
May 06, 2014

PIRSA:14050035
High Energy Physics
There is a close connection between Symmetry Protected Topological Phases and anomalies: a surface of an SPT phase typically has a global symmetry with a nonvanishing 't Hooft anomaly which is canceled by the anomaly inflow from the bulk. This observation together with the known results about the classification of SPT phases suggest that anomalies are much more ubiquitous than thought previously and do not require chiral fermions We elucidate the physical mechanism of anomalies and give examples of bosonic theories with 't Hooft anomalies in various dimensions.
Noncommutative geometry and the symmetries of the standard model

Fedele Lizzi University of Naples Federico II
May 06, 2014

PIRSA:14050031
High Energy Physics

Astrophysics
I will describe Connes approach to the standard model based on spectral noncommutative geometry with particular emphasis on the symmetries. The model poses constraints which are satisfied by the standard model group, and does not leave much room for other possibilities. There is however a possibility for a larger symmetry (the ``grand algebra'') which may also be instrumental to obtain the correct mass of the Higgs.
Probing renormalization group flows using entanglement entropy

Mark Mezei Massachusetts Institute of Technology (MIT)
April 30, 2014

PIRSA:14040144
High Energy Physics
The entanglement entropy of the vacuum of a quantum field theory contains information about physics at all scales and is UV sensitive. A simple refinement of entanglement entropy gets rid of its UV divergence, and allows us to extract entanglement per scale. In two and three spacetime dimensions this quantity can be used as a proxy for the number of degrees of freedom, as it decreases under RG flow. We investigate its behavior around fixed points, and reveal its interesting analytic structure in the space of couplings.
Localizing Braneworlds in Infinite Spaces

Kellogg Stelle Imperial College London
April 29, 2014

PIRSA:14040064
High Energy Physics
There have been a number of attempts to achieve a localization of gravity on a braneworld hypersurface embedded in an infinite spacetime, but these have all fallen short of what might be desired, for various reasons. There have even been no-go theorems claimed for constructions made using just accepted elements of string or M theory. The talk will present a proposed resolution of this problem based upon a hyperbolic solution of type IIA theory with a superposed NS-5 brane. Gravity is bound to the brane surface owing to the existence of a single normalizable bound state of the transverse space Laplacian.
3d N = 4 Gauge Theories, Mirror Symmetry and Hilbert series

Noppadol Mekareeya Imperial College London
April 28, 2014

PIRSA:14040143
High Energy Physics
This talk focuses on vacuum moduli spaces of N=4 supersymmetric field theories in three dimensions. A particular branch of the moduli space, known as the Coulomb branch, receives quantum corrections. We present an exact result, known as the Hilbert series, that enumerates the operators in the chiral ring of such a quantum Coulomb branch. This exact result can be applied to a large class of 3d supersymmetric field theories, with and without known Lagrangian descriptions. As an application, we present a method to compute partition functions of instantons on C^2 for any simple group, including exceptional and non-simply-laced ones.
Causality constraints in gravitational theories
April 22, 2014

PIRSA:14040116
High Energy Physics
Boson Tagging with Wavelets

William Shepherd University of California System
April 15, 2014

PIRSA:14040063
High Energy Physics
I'll present a proof-of-concept new technique for tagging boosted objects which decay into two colored particles based on the wavelet transform. It is able to moderately improve the sensitivity of searches for such particles by 6-7%. I will also discuss future directions of applicability.
New Exact Results in Calabi-Yau, D-branes, and Orientifolds

Sungjay Lee University of Cambridge
April 15, 2014

PIRSA:14040081
High Energy Physics
We compute the exact two-sphere, disk and real projective plane partition functions of two-dimensional supersymmetric theories using the localization technique. From these new results, we will attack old and new important problems in the string theory on Calabi-Yau spaces, and D-branes and Orientifold planes therein.
RG flows with N=1 supersymmetry

Henriette Elvang University of Michigan–Ann Arbor
April 01, 2014

PIRSA:14030074
High Energy Physics
The dilaton effective action plays a key role for the recent proof of the a-theorem by Schwimmer and Komargodski. In the presence of other massless modes, one may ask if this proof is affected. In particular, in renormalization group (RG) flows with N=1 supersymmetry, there is a natural massless partner of the dilaton, namely an axion field. I will discuss RG flows, the a-theorem, and the form of the N=1 supersymmetric dilaton-axion effective action and its physics.

Title	Speaker(s)	Date	Talk Type	Info link
M-strings and their orbifolds	Babak Haghighat	2014-05-20	Scientific Series	View details
Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter	Shiraz Minwalla	2014-05-13	Scientific Series	View details
New strong interactions and the t t-bar asymmetry	Joachim Brod	2014-05-13	Scientific Series	View details
Anomalies of discrete symmetries and Symmetry Protected Topological Phases	Anton Kapustin	2014-05-06	Scientific Series	View details
Noncommutative geometry and the symmetries of the standard model	Fedele Lizzi	2014-05-06	Scientific Series	View details
Probing renormalization group flows using entanglement entropy	Mark Mezei	2014-04-30	Scientific Series	View details
Localizing Braneworlds in Infinite Spaces	Kellogg Stelle	2014-04-29	Scientific Series	View details
3d N = 4 Gauge Theories, Mirror Symmetry and Hilbert series	Noppadol Mekareeya	2014-04-28	Scientific Series	View details
Causality constraints in gravitational theories		2014-04-22	Scientific Series	View details
Boson Tagging with Wavelets	William Shepherd	2014-04-15	Scientific Series	View details
New Exact Results in Calabi-Yau, D-branes, and Orientifolds	Sungjay Lee	2014-04-15	Scientific Series	View details
RG flows with N=1 supersymmetry	Henriette Elvang	2014-04-01	Scientific Series	View details

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High Energy Physics

Format results

M-strings and their orbifolds

Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

New strong interactions and the t t-bar asymmetry

Anomalies of discrete symmetries and Symmetry Protected Topological Phases

Noncommutative geometry and the symmetries of the standard model

Probing renormalization group flows using entanglement entropy

Localizing Braneworlds in Infinite Spaces

3d N = 4 Gauge Theories, Mirror Symmetry and Hilbert series

Causality constraints in gravitational theories

Boson Tagging with Wavelets

New Exact Results in Calabi-Yau, D-branes, and Orientifolds

RG flows with N=1 supersymmetry

M-strings and their orbifolds

Unitarity and crossing symmetry in the S-matirx of large N Chern-Simons theory with fundamental matter

New strong interactions and the t t-bar asymmetry

Anomalies of discrete symmetries and Symmetry Protected Topological Phases

Noncommutative geometry and the symmetries of the standard model

Probing renormalization group flows using entanglement entropy

Localizing Braneworlds in Infinite Spaces

3d N = 4 Gauge Theories, Mirror Symmetry and Hilbert series

Causality constraints in gravitational theories

Boson Tagging with Wavelets

New Exact Results in Calabi-Yau, D-branes, and Orientifolds

RG flows with N=1 supersymmetry