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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
Effective field theory for hydrodynamical systems

Alberto Nicolis Columbia University
March 28, 2014

PIRSA:14030121
High Energy Physics

Astrophysics
GeV Gamma-Rays from the Central Milky Way and the Case for Annihilating Dark Matter

Tracy Slatyer Massachusetts Institute of Technology (MIT) - Department of Physics
March 26, 2014

PIRSA:14030120
High Energy Physics
Far from equilibrium energy flow in quantum critical systems
March 25, 2014

PIRSA:14030089
High Energy Physics
Naturalness and the Weak Gravity Conjecture

Clifford Cheung California Institute of Technology (Caltech) - Physics Office
March 25, 2014

PIRSA:14030119
High Energy Physics
Exact results in supersymmetric gauge theories in various dimensions

Sara Pasquetti University of Milan
March 19, 2014

PIRSA:14030084
High Energy Physics
Before the Bang

Raman Sundrum University of Maryland, College Park
March 18, 2014

PIRSA:14030113
High Energy Physics
Black Holes- the Harmonic Oscillators of the 21st Century

Andrew Strominger Harvard University
March 12, 2014

PIRSA:14030104
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
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.
Effective field theory for hydrodynamical systems

Alberto Nicolis Columbia University
March 28, 2014

PIRSA:14030121
High Energy Physics

Astrophysics
I will review a recently proposed formalism that describes fluids and superfluids in effective field theory terms. I will then focus on applying this formalism to peculiar string-like objects that exist in fluid systems: vortex lines and vortex rings. These do not obey Newton's second law, and, as a consequence, their behavior is highly counterintuitive. I will describe how effective field theory provides us with an optimal tool to understand how they move and how they interact with one another and with sound.
GeV Gamma-Rays from the Central Milky Way and the Case for Annihilating Dark Matter

Tracy Slatyer Massachusetts Institute of Technology (MIT) - Department of Physics
March 26, 2014

PIRSA:14030120
High Energy Physics
Past studies have identified a spatially extended excess of ~1-3 GeV gamma rays from the Galactic Center and inner Galaxy, consistent with the emission expected from annihilating thermal relic dark matter. I will describe recent improvements in the characterization of this signal, which demonstrate that it is spherically symmetric, centered on the Galactic Center, and with a spatial profile consistent with annihilation from a cusped NFW profile. The excess can be detected out to 10 degrees from the Galactic Center, which poses challenges for a millisecond pulsar origin; I will discuss the implications of a dark matter interpretation.
Far from equilibrium energy flow in quantum critical systems
March 25, 2014

PIRSA:14030089
High Energy Physics
We investigate far from equilibrium energy transport in strongly coupled quantum critical systems. Combining results from gauge-gravity duality, relativistic hydrodynamics, and quantum field theory, we argue that long-time energy transport after a local thermal quench occurs via a universal steady-state for any spatial dimensionality. This is described by a boosted thermal state. We determine the transport properties of this emergent steady state, including the average energy flow and its long-time fluctuations.
Naturalness and the Weak Gravity Conjecture

Clifford Cheung California Institute of Technology (Caltech) - Physics Office
March 25, 2014

PIRSA:14030119
High Energy Physics
The weak gravity conjecture (WGC) asserts a powerful consistency condition on gauge theories coupled to quantum gravity: an Abelian, long-range force requires a state of charge q and mass m such that q > m/mPl. Failure of this condition implies the existence of stable black hole remnants and is in tension with no-hair theorems. In this paper, we argue that the WGC creates a non- perturbative obstruction to naturalness, which is the notion that dimensionless coefficients should take on O(1) values in the absence of enhanced symmetry. As an illustration, we show that for scalar quantum electrodynamics, a natural spectrum can actually be forbidden by the WGC, which bounds a radiatively unstable quantity, m, by a radiatively stable quantity, q. More generally, the WGC can be at odds with naturalness in any theory containing charged fundamental scalars. We extend the conditions of the WGC to more complicated theories with multiple gauge symmetries and particles. Finally, we discuss implications for the hierarchy problem and construct a simple model in which the natural value of the electroweak scale—at the cutoff—is forbidden by the WGC.
Exact results in supersymmetric gauge theories in various dimensions

Sara Pasquetti University of Milan
March 19, 2014

PIRSA:14030084
High Energy Physics
One of the central challenges in theoretical physics is to develop non-perturbative methods to describe quantitatively the dynamics of strongly coupled quantum fields. Much progress in this direction has been made for theories with a higher degree of symmetry, such as conformal symmetry or supersymmetry. In recent years the method of localisation has allowed to obtain a great deal of exact results for supersymmetric gauge theories in various dimensions which has led to the discovery of new surprising correspondences such as the celebrated Alday-Gaiotto-Tachikawa correspondence. I will review some recent results which indicate that partition functions of supersymmetric theories formulated on compact manifolds can be expressed in terms of a small set of fundamental building blocks.
Before the Bang

Raman Sundrum University of Maryland, College Park
March 18, 2014

PIRSA:14030113
High Energy Physics
The simplest black hole solution in asymptotic AdS spacetime, the eternal 3-dimensional BTZ black hole, is studied from the viewpoint of AdS/CFT duality. We identify a class of non-local correlators on the CFT side that allow us to generalize the notion of quantum gravity "S-matrix" to scattering inside the horizon. Since the interior of the horizon is a cosmological spacetime with a big bang/crunch-like singularity, our construction can be interpreted as identifying generally coordinate invariant observables of quantum gravity in a simple cosmology. We show in a certain precise sense, that these holographic observables lie "before the big bang" in a region of spacetime containing closed timelike curves. A central tool in our analysis is the realization of BTZ as a quotient of 3-dimensional AdS.
Black Holes- the Harmonic Oscillators of the 21st Century

Andrew Strominger Harvard University
March 12, 2014

PIRSA:14030104
High Energy Physics
In the twentieth century, many problems across all of physics were solved by perturbative methods which reduced them to harmonic oscillators. Black holes are poised to play a similar role for the problems of twenty-first century physics. They are at once the simplest and most complex objects in the physical universe. They are maximally complex in that the number of possible microstates, or entropy, of a black hole is believed to saturate a universal bound. They are maximally simple in that, according to Einstein's theory, they are featureless holes in space characterized only by their mass, charge and angular momentum. This dual relation between simplicity and complexity, as expressed in black holes, has recently been successfully applied to problems in a disparate variety of physical systems. I will give an introduction to the subject intended for a general audience.

Title	Date	Collection	Type	Info
3d N = 4 Gauge Theories, Mirror Symmetry and Hilbert series	2014‑04‑28	Quantum Fields and Strings	Scientific Series	View details
Causality constraints in gravitational theories	2014‑04‑22	Quantum Fields and Strings	Scientific Series	View details
Boson Tagging with Wavelets	2014‑04‑15	Particle Physics	Scientific Series	View details
New Exact Results in Calabi-Yau, D-branes, and Orientifolds	2014‑04‑15	Quantum Fields and Strings	Scientific Series	View details
RG flows with N=1 supersymmetry	2014‑04‑01	Quantum Fields and Strings	Scientific Series	View details
Effective field theory for hydrodynamical systems	2014‑03‑28	Colloquium	Scientific Series	View details
GeV Gamma-Rays from the Central Milky Way and the Case for Annihilating Dark Matter	2014‑03‑26	Particle Physics	Scientific Series	View details
Far from equilibrium energy flow in quantum critical systems	2014‑03‑25	Quantum Fields and Strings	Scientific Series	View details
Naturalness and the Weak Gravity Conjecture	2014‑03‑25	Particle Physics	Scientific Series	View details
Exact results in supersymmetric gauge theories in various dimensions	2014‑03‑19	Colloquium	Scientific Series	View details
Before the Bang	2014‑03‑18	Particle Physics	Scientific Series	View details
Black Holes- the Harmonic Oscillators of the 21st Century	2014‑03‑12	Colloquium	Scientific Series	View details

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Format results

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

Effective field theory for hydrodynamical systems

GeV Gamma-Rays from the Central Milky Way and the Case for Annihilating Dark Matter

Far from equilibrium energy flow in quantum critical systems

Naturalness and the Weak Gravity Conjecture

Exact results in supersymmetric gauge theories in various dimensions

Before the Bang

Black Holes- the Harmonic Oscillators of the 21st Century

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

Effective field theory for hydrodynamical systems

GeV Gamma-Rays from the Central Milky Way and the Case for Annihilating Dark Matter

Far from equilibrium energy flow in quantum critical systems

Naturalness and the Weak Gravity Conjecture

Exact results in supersymmetric gauge theories in various dimensions

Before the Bang

Black Holes- the Harmonic Oscillators of the 21st Century