High Energy Physics

Displaying 1633 - 1644 of 3066

Sequestering the Standard Model Vacuum Energy

Nemanja Kaloper University of California System
February 21, 2014

PIRSA:14020109
High Energy Physics
Causality, holography, and entanglement entropy
February 20, 2014

PIRSA:14020146
General Relativity & Quantum Cosmology

High Energy Physics

Condensed Matter

General Relativity & Quantum Cosmology
Cluster Polylogarithms for Scattering Amplitudes
February 18, 2014

PIRSA:14020147
High Energy Physics
Towards a 1/c Expansion in 2d Conformal Field Theory
February 04, 2014

PIRSA:14020084
High Energy Physics
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

Carlo Meneghelli University of Oxford
January 28, 2014

PIRSA:14010096
High Energy Physics
Boundaries and Defects in 4d N=4 SYM

Masahito Yamazaki University of Tokyo
January 21, 2014

PIRSA:14010086
High Energy Physics
Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders

Sunghoon Jung Korea Institute for Advanced Study
January 16, 2014

PIRSA:14010103
High Energy Physics
Beyond the Standard Paradigm

Paul Langacker Institute for Advanced Study (IAS)
January 15, 2014

PIRSA:13010116
High Energy Physics
(0,4) sigma models and K3

Sarah Harrison Stanford University
December 18, 2013

PIRSA:13120071
High Energy Physics
Integrability (and Near Integrability) in Matrix-valued Field Theories

Axel Cortes Cubero City University of New York (CUNY) - Department of Physics
December 13, 2013

PIRSA:13120068
High Energy Physics
(0,2) Trialities

Abhijit Gadde Stony Brook University
December 10, 2013

PIRSA:13120062
High Energy Physics
No GUTs, All Glory: Charge Quantization and the Standard Model from Nonlinear Sigma Models

John Kehayias University of Tokyo
December 06, 2013

PIRSA:13120056
High Energy Physics

Sequestering the Standard Model Vacuum Energy

Nemanja Kaloper University of California System
February 21, 2014

PIRSA:14020109
High Energy Physics
We propose a very simple reformulation of General Relativity, which completely sequesters from gravity {\it all} of the vacuum energy from a matter sector, including all loop corrections and renders all contributions from phase transitions automatically small. The idea is to make the dimensional parameters in the matter sector functionals of the 4-volume element of the universe. For them to be nonzero, the universe should be finite in spacetime. If this matter is the Standard Model of particle physics, our mechanism prevents any of its vacuum energy, classical or quantum, from sourcing the curvature of the universe. The mechanism is consistent with the large hierarchy between the Planck scale, electroweak scale and curvature scale, and early universe cosmology, including inflation. Consequences of our proposal are that the vacuum curvature of an old and large universe is not zero, but very small, that wDE≃−1 is a transient, and that the universe will collapse in the future.
Causality, holography, and entanglement entropy
February 20, 2014

PIRSA:14020146
General Relativity & Quantum Cosmology

High Energy Physics

Condensed Matter

General Relativity & Quantum Cosmology
After giving a brief overview of holographic entanglement entropy formulas, I will explore a curious feature they imply: when the bulk spacetime includes a black hole, the entanglement entropies often appear to depend on the spacetime geometry inside the horizon. I will ask whether this implies any loss of causality in the field theory. To answer this question, I will present a new general-relativity theorem concerning the causal structure of asymptotically AdS spacetimes, which implies an interesting relationship between bulk and boundary causal domains.
Cluster Polylogarithms for Scattering Amplitudes
February 18, 2014

PIRSA:14020147
High Energy Physics
Motivated by the cluster structure of two-loop scattering amplitudes in N = 4 Yang-Mills theory we define cluster polylogarithm functions. We find that all such functions of weight 4 are made up of a single simple building block associated to the A2 cluster algebra. Adding the requirement of locality on generalized Stasheff polytopes, we find that these A2 building blocks arrange themselves to form a unique function associated to the A3 cluster algebra. ThisA3 function manifests all of the cluster algebraic structure of the two-loop n-particle MHV amplitudes for all n, and we use it to provide an explicit representation for the most complicated part of the n = 7 amplitude as an example.
Towards a 1/c Expansion in 2d Conformal Field Theory
February 04, 2014

PIRSA:14020084
High Energy Physics
I will describe progress in deriving 3d gravity directly from 2d conformal field theory at large central charge 'c'. In a large class of CFTs, using general arguments like modular invariance, crossing symmetry, and the OPE expansion, the spectrum, the entanglement entropy, and certain partition functions can be computed to leading order in a 1/c expansion. The results agree with universal features of 3d gravity required by black hole thermodynamics and the Ryu-Takayanagi formula; furthermore, the relevant 3d geometries appear automatically from CFT calculations in this regime.
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

Carlo Meneghelli University of Oxford
January 28, 2014

PIRSA:14010096
High Energy Physics
In arXiv:0908.4052, Nekrasov and Shatashvili pointed out that the N=2 instanton partition function in a special limit of the Omega-deformation parameters is characterized by certain thermodynamic Bethe ansatz (TBA) like equations.In this talk I will present an explicit derivation of this fact as well as generalizations to quiver gauge theories. The TBA equations derived entirely within gauge theory have been proposed to encode the spectrum of a large class of quantum integrable systems. I will conclude with some remarks on this correspondence.
Boundaries and Defects in 4d N=4 SYM

Masahito Yamazaki University of Tokyo
January 21, 2014

PIRSA:14010086
High Energy Physics
We discuss boundary conditions and domain walls in 4d N=4 SYM, focusing on those preserving 4 supercharges. Along the way we revisit the old problem of the quantum-corrected moduli space of 3d N=2 theories.
Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders

Sunghoon Jung Korea Institute for Advanced Study
January 16, 2014

PIRSA:14010103
High Energy Physics
Discovery of the Higgs boson and lack of discovery of superpartners in the first run at LHC are both predictions of split supersymmetry with thermal dark matter. We discuss what it would take to find gluinos at hadron supercolliders, including the LHC at 14 TeV center of mass energy, and future pp colliders at 100 TeV and 200 TeV. We generalize the discussion by re-expressing the search capacity in terms of gluino to lightest superpartner mass ratio, and apply results to other scenarios, such as gauge mediation and mirage mediation. In those models, distinctive gaugino mass ratios arise at leading order, but can be significantly modified by large logarithmic quantum corrections from split spectrum.
Beyond the Standard Paradigm

Paul Langacker Institute for Advanced Study (IAS)
January 15, 2014

PIRSA:13010116
High Energy Physics
I reexamine the current situation in particle and neutrino physics from a top-down perspective, discussing such underlying issues as uniqueness versus environment, minimality versus remnants, and naturalness versus tuning.
(0,4) sigma models and K3

Sarah Harrison Stanford University
December 18, 2013

PIRSA:13120071
High Energy Physics
TBA
Integrability (and Near Integrability) in Matrix-valued Field Theories

Axel Cortes Cubero City University of New York (CUNY) - Department of Physics
December 13, 2013

PIRSA:13120068
High Energy Physics
The principal chiral sigma model (PCSM) in 1+1 dimensions is asymptotically free and has as SU(N)-valued field with massive excitations. We have found all the exact form factors and two-point function of the Noether-current operators at large N using the integrable bootstrap program. At finite N, only the first non-trivial form factors are found, which give a good long distance approximation for the two-point function. We show how to use these new exact results to study non-integrable deformations. One example is the PCSM coupled to a Yang-Mills field. One can approximate the spectrum of the meson-like bound states using our form factors. We also examine an anisotropic version of (2+1)-dimensional Yang-Mills theory, which can be interpreted as an array of coupled PCSM’s.
(0,2) Trialities

Abhijit Gadde Stony Brook University
December 10, 2013

PIRSA:13120062
High Energy Physics
Motivated by the connection between 4-manifolds and 2d N=(0,2) theories, we study the dynamics of a fairly large class of 2d N=(0,2) gauge theories. We see that physics of such theories is very rich, much as the physics of 4d N=1 theories. We discover a new type of duality that is very reminiscent of the 4d Seiberg duality. Surprisingly, the new 2d duality is an operation of order three. We study the low energy physics and use elliptic genus to detect dynamical supersymmetry breaking.
No GUTs, All Glory: Charge Quantization and the Standard Model from Nonlinear Sigma Models

John Kehayias University of Tokyo
December 06, 2013

PIRSA:13120056
High Energy Physics
I will present recent and ongoing work in collaboration with Tsutomu Yanagida and Simeon Hellerman (arXiv:1309.0692 and 1312.xxxx) on a new way to obtain charge quantization, without a GUT or monopole solution. In the CP^1 model, SU(2)_G/U(1)_H, consistency conditions for a charged field and its transformation properties over the entire group manifold lead to a charge quantization condition. By gauging the U(1)_H and identifying it with hypercharge, we find charge quantization in the SM without a monopole or GUT, purely from the structure and dynamics of the nonlinear sigma model. This is easily extended to CP^2 and general CP^k models. Phenomenologically, the CP^1 model has a fractionally charged stable Nambu-Goldstone boson (NGB), which has intriguing applications to nuclear physics and dark matter. The CP^2 model has the Higgs as the NGB. With some additional minor assumptions, anomaly freedom then leads to the matter content of a generation in the SM.

Title	Speaker(s)	Date	Talk Type	Info link
Sequestering the Standard Model Vacuum Energy	Nemanja Kaloper	2014-02-21	Scientific Series	View details
Causality, holography, and entanglement entropy		2014-02-20	Scientific Series	View details
Cluster Polylogarithms for Scattering Amplitudes		2014-02-18	Scientific Series	View details
Towards a 1/c Expansion in 2d Conformal Field Theory		2014-02-04	Scientific Series	View details
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz	Carlo Meneghelli	2014-01-28	Scientific Series	View details
Boundaries and Defects in 4d N=4 SYM	Masahito Yamazaki	2014-01-21	Scientific Series	View details
Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders	Sunghoon Jung	2014-01-16	Scientific Series	View details
Beyond the Standard Paradigm	Paul Langacker	2014-01-15	Scientific Series	View details
(0,4) sigma models and K3	Sarah Harrison	2013-12-18	Scientific Series	View details
Integrability (and Near Integrability) in Matrix-valued Field Theories	Axel Cortes Cubero	2013-12-13	Scientific Series	View details
(0,2) Trialities	Abhijit Gadde	2013-12-10	Scientific Series	View details
No GUTs, All Glory: Charge Quantization and the Standard Model from Nonlinear Sigma Models	John Kehayias	2013-12-06	Scientific Series	View details

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High Energy Physics

Format results

Sequestering the Standard Model Vacuum Energy

Causality, holography, and entanglement entropy

Cluster Polylogarithms for Scattering Amplitudes

Towards a 1/c Expansion in 2d Conformal Field Theory

Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

Boundaries and Defects in 4d N=4 SYM

Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders

Beyond the Standard Paradigm

(0,4) sigma models and K3

Integrability (and Near Integrability) in Matrix-valued Field Theories

(0,2) Trialities

No GUTs, All Glory: Charge Quantization and the Standard Model from Nonlinear Sigma Models

Sequestering the Standard Model Vacuum Energy

Causality, holography, and entanglement entropy

Cluster Polylogarithms for Scattering Amplitudes

Towards a 1/c Expansion in 2d Conformal Field Theory

Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz

Boundaries and Defects in 4d N=4 SYM

Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders

Beyond the Standard Paradigm

(0,4) sigma models and K3

Integrability (and Near Integrability) in Matrix-valued Field Theories

(0,2) Trialities

No GUTs, All Glory: Charge Quantization and the Standard Model from Nonlinear Sigma Models