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Before the Bang

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

PIRSA:14030113
High Energy Physics
13/14 PSI - Explorations in String Theory - Lecture 2

Andrei Starinets University of Oxford

March 18, 2014

PIRSA:14030060
Inflation After Planck
March 18, 2014

PIRSA:14030116
Astrophysics
13/14 PSI - Explorations in Condensed Matter - Lecture 2

Guifre Vidal Alphabet (United States)

March 18, 2014

PIRSA:14040023
13/14 PSI - Explorations in Quantum Information - Lecture 2

David Cory Institute for Quantum Computing (IQC)

March 18, 2014

PIRSA:14030030
Seeing is Believing: Direct Observation of a General Quantum State

Jeff Lundeen University of Ottawa
March 17, 2014

PIRSA:14030110
Quantum Physics
13/14 PSI - Explorations in String Theory - Lecture 1

Andrei Starinets University of Oxford

March 17, 2014

PIRSA:14030059
13/14 PSI - Explorations in Condensed Matter - Lecture 1

Guifre Vidal Alphabet (United States)

March 17, 2014

PIRSA:14040022
13/14 PSI - Explorations in Quantum Information - Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 17, 2014

PIRSA:14030029
Introduction to Effective Field Theories - Lecture 18

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030079
Are superselection rules fundamental?

Robert Spekkens Perimeter Institute for Theoretical Physics
March 14, 2014

PIRSA:14030114
Condensed Matter
Introduction to Effective Field Theories - Lecture 17

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030075

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.
13/14 PSI - Explorations in String Theory - Lecture 2

Andrei Starinets University of Oxford

March 18, 2014

PIRSA:14030060
Inflation After Planck
March 18, 2014

PIRSA:14030116
Astrophysics
The Planck satellite measurement of the cosmic microwave background has provided spectacular confirmation of the predictions of inflationary cosmology, putting inflation on a firm footing as the leading theory of the very early universe. I will discuss the implications of Planck for the simplest canonical single-field inflation models, which are favored by the data. Then I will discuss the most general question: How strong is the case that inflation is the "right" theory of the early universe?
13/14 PSI - Explorations in Condensed Matter - Lecture 2

Guifre Vidal Alphabet (United States)

March 18, 2014

PIRSA:14040023
13/14 PSI - Explorations in Quantum Information - Lecture 2

David Cory Institute for Quantum Computing (IQC)

March 18, 2014

PIRSA:14030030
Seeing is Believing: Direct Observation of a General Quantum State

Jeff Lundeen University of Ottawa
March 17, 2014

PIRSA:14030110
Quantum Physics
Central to quantum theory, the wavefunction is a complex distribution associated with a quantum system. Despite its fundamental role, it is typically introduced as an abstract element of the theory with no explicit definition. Rather, physicists come to a working understanding of it through its use to calculate measurement outcome probabilities through the Born Rule. Tomographic methods can reconstruct the wavefunction from measured probabilities. In contrast, I present a method to directly measure the wavefunction so that its real and imaginary components appear straight on our measurement apparatus. I will also present new work extending this concept to mixed quantum states. This extension directly measures a little-known proposal by Dirac for a classical analog to a quantum operator. Furthermore, it reveals that our direct measurement is a rigorous example of a quasi-probability phase-space (i.e. x,p) distribution that is closely related to the Q, P, and Wigner functions. Our direct measurement method gives the quantum state a plain and general meaning in terms of a specific set of simple operations in the lab.
13/14 PSI - Explorations in String Theory - Lecture 1

Andrei Starinets University of Oxford

March 17, 2014

PIRSA:14030059
13/14 PSI - Explorations in Condensed Matter - Lecture 1

Guifre Vidal Alphabet (United States)

March 17, 2014

PIRSA:14040022
13/14 PSI - Explorations in Quantum Information - Lecture 1

David Cory Institute for Quantum Computing (IQC)

March 17, 2014

PIRSA:14030029
Introduction to Effective Field Theories - Lecture 18

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030079
Are superselection rules fundamental?

Robert Spekkens Perimeter Institute for Theoretical Physics
March 14, 2014

PIRSA:14030114
Condensed Matter
Superselection rules in quantum theory assert the impossibility of preparing coherent superpositions of certain conserved quantities. For instance, it is commonly presumed that there is a superselection rule for charge and for baryon number, as well as a "univalence superselection rule" forbidding a coherent superposition of a fermion and a boson. I will show how many superselection rules can be effectively lifted using a reference frame for the variable that is conjugate to the conserved quantity. I will also discuss subtleties related to the univalence superselection rule.
Introduction to Effective Field Theories - Lecture 17

Cliff Burgess McMaster University

March 14, 2014

PIRSA:14030075

Title	Date	Collection	Type	Info
Before the Bang	2014‑03‑18	Particle Physics	Scientific Series	View details
13/14 PSI - Explorations in String Theory - Lecture 2	2014‑03‑18	13/14 PSI - Explorations in String Theory	Course	View details
Inflation After Planck	2014‑03‑18	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Explorations in Condensed Matter - Lecture 2	2014‑03‑18	13/14 PSI - Explorations in Condensed Matter	Course	View details
13/14 PSI - Explorations in Quantum Information - Lecture 2	2014‑03‑18	13/14 PSI - Explorations in Quantum Information	Course	View details
Seeing is Believing: Direct Observation of a General Quantum State	2014‑03‑17	Quantum Foundations	Scientific Series	View details
13/14 PSI - Explorations in String Theory - Lecture 1	2014‑03‑17	13/14 PSI - Explorations in String Theory	Course	View details
13/14 PSI - Explorations in Condensed Matter - Lecture 1	2014‑03‑17	13/14 PSI - Explorations in Condensed Matter	Course	View details
13/14 PSI - Explorations in Quantum Information - Lecture 1	2014‑03‑17	13/14 PSI - Explorations in Quantum Information	Course	View details
Introduction to Effective Field Theories - Lecture 18	2014‑03‑14	Introduction to Effective Field Theories	Course	View details
Are superselection rules fundamental?	2014‑03‑14	Quantum Matter	Scientific Series	View details
Introduction to Effective Field Theories - Lecture 17	2014‑03‑14	Introduction to Effective Field Theories	Course	View details

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Format results

Before the Bang

13/14 PSI - Explorations in String Theory - Lecture 2

Inflation After Planck

13/14 PSI - Explorations in Condensed Matter - Lecture 2

13/14 PSI - Explorations in Quantum Information - Lecture 2

Seeing is Believing: Direct Observation of a General Quantum State

13/14 PSI - Explorations in String Theory - Lecture 1

13/14 PSI - Explorations in Condensed Matter - Lecture 1

13/14 PSI - Explorations in Quantum Information - Lecture 1

Introduction to Effective Field Theories - Lecture 18

Are superselection rules fundamental?

Introduction to Effective Field Theories - Lecture 17

Before the Bang

13/14 PSI - Explorations in String Theory - Lecture 2

Inflation After Planck

13/14 PSI - Explorations in Condensed Matter - Lecture 2

13/14 PSI - Explorations in Quantum Information - Lecture 2

Seeing is Believing: Direct Observation of a General Quantum State

13/14 PSI - Explorations in String Theory - Lecture 1

13/14 PSI - Explorations in Condensed Matter - Lecture 1

13/14 PSI - Explorations in Quantum Information - Lecture 1

Introduction to Effective Field Theories - Lecture 18

Are superselection rules fundamental?

Introduction to Effective Field Theories - Lecture 17