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Search results in High Energy Physics from PIRSA

1561 - 1572 of 2995 Results

Line Defects and Tropicalization

Clay Cordova University of Chicago
March 11, 2014

PIRSA:14030106
High Energy Physics
How Much Information Can SUSY QM Conserve About SUSY QFT?

S. James Gates Jr. University of Maryland, College Park
March 04, 2014

PIRSA:14030101
High Energy Physics
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies
February 25, 2014

PIRSA:14020152
High Energy Physics

Astrophysics
Quantum Liquids and Turbulent Black Holes

Allan Adams Massachusetts Institute of Technology (MIT) - Department of Physics
February 24, 2014

PIRSA:14020141
High Energy Physics
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

Line Defects and Tropicalization

Clay Cordova University of Chicago
March 11, 2014

PIRSA:14030106
High Energy Physics
I will review BPS line defects in 4d N=2 field theories and describe a technique for calculating their spectra using quiver quantum mechanics.
How Much Information Can SUSY QM Conserve About SUSY QFT?

S. James Gates Jr. University of Maryland, College Park
March 04, 2014

PIRSA:14030101
High Energy Physics
In this presentation, evidence is given that supersymmetrical theories may be exceptional in their ability to conserve information about space-time representations under the impact of dimensional compactification. This is the essence of the concept of ``SUSY Holography.''
Large Tensor-to-Scalar Ratio in Small-Field Inflation

Takeshi Kobayashi SISSA International School for Advanced Studies
February 25, 2014

PIRSA:14020152
High Energy Physics

Astrophysics
The production of gravitational waves from cosmic inflation > is normally bounded by the inflaton field excursion. This relation, > which is often referred to as the Lyth bound, claims that > observationally large gravitational waves are produced only if the > inflaton has a super-Planckian field range. In this talk I will point > out that this general belief is not necessarily true when there are > additional light fields producing density perturbations. Perturbations > seeded by the inflaton can be suppressed under such situations, thus > allow large gravitational waves to be produced even from small-field (i.e. > sub-Planckian) inflation. I will also show that the field bound is > taken over by the light field when the inflaton-induced perturbations > are suppressed, thus present a generalized form of the Lyth bound that > applies to the total field space. The calculations are rather simple, > so I will explain my work on a blackboard.
Quantum Liquids and Turbulent Black Holes

Allan Adams Massachusetts Institute of Technology (MIT) - Department of Physics
February 24, 2014

PIRSA:14020141
High Energy Physics
The physics of black hole horizons is intimately connected to the physics of quantum liquids. In this talk I will review the connection and draw lessons about quantum turbulence from black hole dynamics and vice versa. For example, gravitational dynamics reveal that quantum turbulence can behave very differently from normal fluid turbulence in 2d, with long-wavelength excitations rapidly dissolving into small fluctuations and dissipating as in a 3d normal liquid. Meanwhile, familiar facts about turbulent flows in normal fluids imply that the horizons of certain accreting black holes evolve in time as if they have a non-trivial fractal dimension.
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.

Title	Date	Collection	Type	Info
Line Defects and Tropicalization	2014‑03‑11	Quantum Fields and Strings	Scientific Series	View details
How Much Information Can SUSY QM Conserve About SUSY QFT?	2014‑03‑04	Quantum Fields and Strings	Scientific Series	View details
Large Tensor-to-Scalar Ratio in Small-Field Inflation	2014‑02‑25	Particle Physics	Scientific Series	View details
Quantum Liquids and Turbulent Black Holes	2014‑02‑24	Quantum Fields and Strings	Scientific Series	View details
Sequestering the Standard Model Vacuum Energy	2014‑02‑21	Particle Physics	Scientific Series	View details
Causality, holography, and entanglement entropy	2014‑02‑20	Quantum Fields and Strings	Scientific Series	View details
Cluster Polylogarithms for Scattering Amplitudes	2014‑02‑18	Quantum Fields and Strings	Scientific Series	View details
Towards a 1/c Expansion in 2d Conformal Field Theory	2014‑02‑04	Quantum Fields and Strings	Scientific Series	View details
Mayer-Cluster Expansion of Instanton Partition Functions and Thermodynamic Bethe Ansatz	2014‑01‑28	Quantum Fields and Strings	Scientific Series	View details
Boundaries and Defects in 4d N=4 SYM	2014‑01‑21	Quantum Fields and Strings	Scientific Series	View details
Gaugino physics of split supersymmetry spectrum at the LHC and future proton colliders	2014‑01‑16	Particle Physics	Scientific Series	View details
Beyond the Standard Paradigm	2014‑01‑15	Colloquium	Scientific Series	View details

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Format results

Line Defects and Tropicalization

How Much Information Can SUSY QM Conserve About SUSY QFT?

Large Tensor-to-Scalar Ratio in Small-Field Inflation

Quantum Liquids and Turbulent Black Holes

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

Line Defects and Tropicalization

How Much Information Can SUSY QM Conserve About SUSY QFT?

Large Tensor-to-Scalar Ratio in Small-Field Inflation

Quantum Liquids and Turbulent Black Holes

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