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An invitation to an invitation to causal sets

Joe Henson BNP Paribas Asset Management London
September 14, 2010

PIRSA:10090092
Quantum Physics
Scattering Amplitudes from Single-Cuts: Lecture 2

Simon Caron-Huot McGill University

September 14, 2010

PIRSA:10090094
Relativity (PHYS 604) - Lecture 2

Neil Turok University of Edinburgh

September 14, 2010

PIRSA:10090027
Quantum Theory (PHYS 605) - Lecture 2

Ben Schumacher Kenyon College

September 14, 2010

PIRSA:10090013
Scattering Amplitudes from Single-Cuts: Lecture 1

Simon Caron-Huot McGill University

September 13, 2010

PIRSA:10090093
Relativity (PHYS 604) - Lecture 1

Neil Turok University of Edinburgh

September 13, 2010

PIRSA:10090026
Quantum Theory (PHYS 605) - Lecture 1

Ben Schumacher Kenyon College

September 13, 2010

PIRSA:10090012
Introduction to Complex Analysis/Computer Skills - Lecture 9B
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 10, 2010

PIRSA:10090089
Introduction to Complex Analysis/Computer Skills - Lecture 9A
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 10, 2010

PIRSA:10090079
Introduction to Complex Analysis/Computer Skills - Lecture 8B
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 09, 2010

PIRSA:10090088
Introduction to Complex Analysis/Computer Skills - Lecture 8A
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 09, 2010

PIRSA:10090078
Cosmological constant, q-theory, and new TeV-scale physics

Frans Klinkhamer Karlsruhe Institute of Technology
September 08, 2010

PIRSA:10090000
General Relativity & Quantum Cosmology

An invitation to an invitation to causal sets

Joe Henson BNP Paribas Asset Management London
September 14, 2010

PIRSA:10090092
Quantum Physics
A brief review of some recent work on the causal set approach to quantum gravity. Causal sets are a discretisation of spacetime that allow the symmetries of GR to be preserved in the continuum approximation. One proposed application of causal sets is to use them as the histories in a quantum sum-over-histories, i.e. to construct a quantum theory of spacetime. It is expected by many that quantum gravity will introduce some kind of fuzziness uncertainty and perhaps discreteness into spacetime, and generic effects of this fuzziness are currently being sought. Applied as a model of discrete spacetime, causal sets can be used to construct simple phenomenological models which allow us to understand some of the consequences of this general expectation.
Scattering Amplitudes from Single-Cuts: Lecture 2

Simon Caron-Huot McGill University

September 14, 2010

PIRSA:10090094

On-shell methods provide a powerful tool for the perturbative computation of scattering amplitudes in gauge theories, such as QCD. In these lectures I will focus on such methods which can be developed without invoking unitarity, but rather by setting one propagator by loop level on-shell ("single-cuts"). After summarizing the present status of applying these ideas to QCD, I will discuss their recent successful application to planar N=4 super Yang-Mills, leading to on-shell recursion relations for loop integrands.
Relativity (PHYS 604) - Lecture 2

Neil Turok University of Edinburgh

September 14, 2010

PIRSA:10090027
Quantum Theory (PHYS 605) - Lecture 2

Ben Schumacher Kenyon College

September 14, 2010

PIRSA:10090013
Scattering Amplitudes from Single-Cuts: Lecture 1

Simon Caron-Huot McGill University

September 13, 2010

PIRSA:10090093

On-shell methods provide a powerful tool for the perturbative computation of scattering amplitudes in gauge theories, such as QCD. In these lectures I will focus on such methods which can be developed without invoking unitarity, but rather by setting one propagator by loop level on-shell ("single-cuts"). After summarizing the present status of applying these ideas to QCD, I will discuss their recent successful application to planar N=4 super Yang-Mills, leading to on-shell recursion relations for loop integrands.
Relativity (PHYS 604) - Lecture 1

Neil Turok University of Edinburgh

September 13, 2010

PIRSA:10090026
Quantum Theory (PHYS 605) - Lecture 1

Ben Schumacher Kenyon College

September 13, 2010

PIRSA:10090012
Introduction to Complex Analysis/Computer Skills - Lecture 9B
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 10, 2010

PIRSA:10090089
Introduction to Complex Analysis/Computer Skills - Lecture 9A
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 10, 2010

PIRSA:10090079
Introduction to Complex Analysis/Computer Skills - Lecture 8B
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 09, 2010

PIRSA:10090088
Introduction to Complex Analysis/Computer Skills - Lecture 8A
- Pedro Vieira Perimeter Institute for Theoretical Physics
- Denis Dalidovich
- Callum Durnford
- Tibra Ali Perimeter Institute for Theoretical Physics
September 09, 2010

PIRSA:10090078
Cosmological constant, q-theory, and new TeV-scale physics

Frans Klinkhamer Karlsruhe Institute of Technology
September 08, 2010

PIRSA:10090000
General Relativity & Quantum Cosmology
A brief introduction to the notorious "cosmological constant problem" is given. Then, a particular approach is discussed, which has been developed by Volovik and the present speaker over the last years and which goes under the name of q-theory. This approach provides a possible solution of the main cosmological constant problem, why is |Lambda|^(1/4) negligible compared to the energy scales of the electroweak standard model (not to mention the Planck energy)? The next problem is, of course, the small but nonzero value of the actual cosmological constant, responsible for the observed "accelerating universe." This problem can also be addressed in the framework of q-theory. In fact, the observed value Lambda ~ (meV)^4 may correspond to the remnant vacuum energy density of dynamical processes taking place at a cosmic age set by the mass scale M ~ E_ew of ultramassive particles with electroweak interactions. A first estimate of the required value of the energy scale E_ew ranges from 3 to 9 TeV. If correct, this estimate implies the existence of new TeV-scale physics beyond the standard model.

Title	Date	Collection	Type	Info
An invitation to an invitation to causal sets	2010‑09‑14	Quantum Foundations	Scientific Series	View details
Scattering Amplitudes from Single-Cuts: Lecture 2	2010‑09‑14	'Scattering amplitudes from single-cuts'	Course	View details
Relativity (PHYS 604) - Lecture 2	2010‑09‑14	10/11 PSI - Relativity	Course	View details
Quantum Theory (PHYS 605) - Lecture 2	2010‑09‑14	10/11 PSI - Quantum Theory	Course	View details
Scattering Amplitudes from Single-Cuts: Lecture 1	2010‑09‑13	'Scattering amplitudes from single-cuts'	Course	View details
Relativity (PHYS 604) - Lecture 1	2010‑09‑13	10/11 PSI - Relativity	Course	View details
Quantum Theory (PHYS 605) - Lecture 1	2010‑09‑13	10/11 PSI - Quantum Theory	Course	View details
Introduction to Complex Analysis/Computer Skills - Lecture 9B	2010‑09‑10	10/11 PSI - Introduction to Complex Analysis/Computer Skills	Course	View details
Introduction to Complex Analysis/Computer Skills - Lecture 9A	2010‑09‑10	10/11 PSI - Introduction to Complex Analysis/Computer Skills	Course	View details
Introduction to Complex Analysis/Computer Skills - Lecture 8B	2010‑09‑09	10/11 PSI - Introduction to Complex Analysis/Computer Skills	Course	View details
Introduction to Complex Analysis/Computer Skills - Lecture 8A	2010‑09‑09	10/11 PSI - Introduction to Complex Analysis/Computer Skills	Course	View details
Cosmological constant, q-theory, and new TeV-scale physics	2010‑09‑08	Quantum Gravity	Scientific Series	View details

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Format results

An invitation to an invitation to causal sets

Scattering Amplitudes from Single-Cuts: Lecture 2

Relativity (PHYS 604) - Lecture 2

Quantum Theory (PHYS 605) - Lecture 2

Scattering Amplitudes from Single-Cuts: Lecture 1

Relativity (PHYS 604) - Lecture 1

Quantum Theory (PHYS 605) - Lecture 1

Introduction to Complex Analysis/Computer Skills - Lecture 9B

Introduction to Complex Analysis/Computer Skills - Lecture 9A

Introduction to Complex Analysis/Computer Skills - Lecture 8B

Introduction to Complex Analysis/Computer Skills - Lecture 8A

Cosmological constant, q-theory, and new TeV-scale physics

An invitation to an invitation to causal sets

Scattering Amplitudes from Single-Cuts: Lecture 2

Relativity (PHYS 604) - Lecture 2

Quantum Theory (PHYS 605) - Lecture 2

Scattering Amplitudes from Single-Cuts: Lecture 1

Relativity (PHYS 604) - Lecture 1

Quantum Theory (PHYS 605) - Lecture 1

Introduction to Complex Analysis/Computer Skills - Lecture 9B

Introduction to Complex Analysis/Computer Skills - Lecture 9A

Introduction to Complex Analysis/Computer Skills - Lecture 8B

Introduction to Complex Analysis/Computer Skills - Lecture 8A

Cosmological constant, q-theory, and new TeV-scale physics