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Parameterizing dark sector perturbations

Jonathan Pearson Durham University
January 15, 2013

PIRSA:13010019
Astrophysics
12/13 PSI - String Theory Review Lecture 7

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics
January 15, 2013

PIRSA:13010053
High Energy Physics
12/13 PSI - Standard Model Review Lecture 7

Mark Wise California Institute of Technology (Caltech)
January 15, 2013

PIRSA:13010032
High Energy Physics
Exotic topological order from quantum fractal code

Beni Yoshida Perimeter Institute for Theoretical Physics
January 14, 2013

PIRSA:13010101
Quantum Physics
12/13 PSI - Found Quantum Mechanics Lecture 6

Robert Spekkens Perimeter Institute for Theoretical Physics
January 14, 2013

PIRSA:13010073
High Energy Physics
12/13 PSI - String Theory Review Lecture 6

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics
January 14, 2013

PIRSA:13010052
High Energy Physics
12/13 PSI - Standard Model Review Lecture 6

Mark Wise California Institute of Technology (Caltech)
January 14, 2013

PIRSA:13010031
High Energy Physics
12/13 PSI - Found Quantum Mechanics Lecture 5

Robert Spekkens Perimeter Institute for Theoretical Physics
January 11, 2013

PIRSA:13010070
High Energy Physics
12/13 PSI - String Theory Review Lecture 5

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics
January 11, 2013

PIRSA:13010047
High Energy Physics
12/13 PSI - Standard Model Review Lecture 5

Mark Wise California Institute of Technology (Caltech)
January 11, 2013

PIRSA:13010028
High Energy Physics
New transport properties of holographic superfluids

Daniel Fernandez University of Iceland
January 10, 2013

PIRSA:13010004
General Relativity & Quantum Cosmology
12/13 PSI - Found Quantum Mechanics Lecture 4

Robert Spekkens Perimeter Institute for Theoretical Physics
January 10, 2013

PIRSA:13010069
High Energy Physics

Parameterizing dark sector perturbations

Jonathan Pearson Durham University
January 15, 2013

PIRSA:13010019
Astrophysics
When recent observational evidence and the GR+FRW+CDM model are combined we obtain the result that the Universe is accelerating, where the acceleration is due to some not-yet-understood "dark sector". There has been a considerable number of theoretical models constructed in an attempt to provide an "understanding" of the dark sector: dark energy and modified gravity theories. The proliferation of modified gravity and dark energy models has brought to light the need to construct a "generic" way to parameterize the dark sector. We will discuss our new way of approaching this problem, looking at linearised perturbations. Our approach is inspired by that taken in particle physics, where the most general modifications to the standard model are written down for a given field content that is compatible with some assumed symmetry (which we take to be isotropy of the background spatial sections). Our emphasis is on constructing a theoretically motivated toolkit which can be used to extract meaningful information about the dark sector (such as its field content). We find, for example, that the observational impact of very broad classes of theories can be encoded by a very small (less than 5) number of parameters. It is these parameters which we hope to measure with observational data.
12/13 PSI - String Theory Review Lecture 7

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics
January 15, 2013

PIRSA:13010053
High Energy Physics
12/13 PSI - Standard Model Review Lecture 7

Mark Wise California Institute of Technology (Caltech)
January 15, 2013

PIRSA:13010032
High Energy Physics
Exotic topological order from quantum fractal code

Beni Yoshida Perimeter Institute for Theoretical Physics
January 14, 2013

PIRSA:13010101
Quantum Physics
We present a family of three-dimensional local quantum codes with pairs of fractal logical operators. It has two polynomials over finite fields as input parameters which generate fractal shapes of anti-commuting logical operators, and possesses exotic topological order with quantum glassiness which is beyond descriptions of conventional topological field theory. A necessary and sufficient condition for being free from string-like logical operators is obtained under which the model works as marginally self-correcting quantum memory. We also provide theoretical tools to analyze physical and coding properties of translation symmetric stabilizer Hamiltonians.
12/13 PSI - Found Quantum Mechanics Lecture 6

Robert Spekkens Perimeter Institute for Theoretical Physics
January 14, 2013

PIRSA:13010073
High Energy Physics
12/13 PSI - String Theory Review Lecture 6

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics
January 14, 2013

PIRSA:13010052
High Energy Physics
12/13 PSI - Standard Model Review Lecture 6

Mark Wise California Institute of Technology (Caltech)
January 14, 2013

PIRSA:13010031
High Energy Physics
12/13 PSI - Found Quantum Mechanics Lecture 5

Robert Spekkens Perimeter Institute for Theoretical Physics
January 11, 2013

PIRSA:13010070
High Energy Physics
12/13 PSI - String Theory Review Lecture 5

Barton Zwiebach Massachusetts Institute of Technology (MIT) - Department of Physics
January 11, 2013

PIRSA:13010047
High Energy Physics
12/13 PSI - Standard Model Review Lecture 5

Mark Wise California Institute of Technology (Caltech)
January 11, 2013

PIRSA:13010028
High Energy Physics
New transport properties of holographic superfluids

Daniel Fernandez University of Iceland
January 10, 2013

PIRSA:13010004
General Relativity & Quantum Cosmology
In the context of holography applied to condensed matter theory, I will present an analysis of transport properties of p-wave superfluids by means of a gravity dual. Fluctuations modes in the SU(2) Einstein-Yang-Mills theory are considered, and phenomenological implications are derived. Due to the spatial anisotropy of the system, a non-universal shear viscosity is obtained, along with a new coefficient associated to normal stress differences. I will also discuss how the transport phenomena in this model is related to the thermoelectric, flexoelectric and piezoelectric effects (mixing of electric current, heat flux and mechanical stress), which have been observed in some superconductors and crystal liquids.
12/13 PSI - Found Quantum Mechanics Lecture 4

Robert Spekkens Perimeter Institute for Theoretical Physics
January 10, 2013

PIRSA:13010069
High Energy Physics

Title	Date	Collection	Type	Info
Parameterizing dark sector perturbations	2013‑01‑15	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - String Theory Review Lecture 7	2013‑01‑15	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 7	2013‑01‑15	12/13 PSI - Standard Model Review	Course	View details
Exotic topological order from quantum fractal code	2013‑01‑14	Perimeter Institute Quantum Discussions	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 6	2013‑01‑14	12/13 PSI - Found Quantum Mechanics	Course	View details
12/13 PSI - String Theory Review Lecture 6	2013‑01‑14	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 6	2013‑01‑14	12/13 PSI - Standard Model Review	Course	View details
12/13 PSI - Found Quantum Mechanics Lecture 5	2013‑01‑11	12/13 PSI - Found Quantum Mechanics	Course	View details
12/13 PSI - String Theory Review Lecture 5	2013‑01‑11	12/13 PSI - String Theory Review	Course	View details
12/13 PSI - Standard Model Review Lecture 5	2013‑01‑11	12/13 PSI - Standard Model Review	Course	View details
New transport properties of holographic superfluids	2013‑01‑10	Strong Gravity	Scientific Series	View details
12/13 PSI - Found Quantum Mechanics Lecture 4	2013‑01‑10	12/13 PSI - Found Quantum Mechanics	Course	View details

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Format results

Parameterizing dark sector perturbations

12/13 PSI - String Theory Review Lecture 7

12/13 PSI - Standard Model Review Lecture 7

Exotic topological order from quantum fractal code

12/13 PSI - Found Quantum Mechanics Lecture 6

12/13 PSI - String Theory Review Lecture 6

12/13 PSI - Standard Model Review Lecture 6

12/13 PSI - Found Quantum Mechanics Lecture 5

12/13 PSI - String Theory Review Lecture 5

12/13 PSI - Standard Model Review Lecture 5

New transport properties of holographic superfluids

12/13 PSI - Found Quantum Mechanics Lecture 4

Parameterizing dark sector perturbations

12/13 PSI - String Theory Review Lecture 7

12/13 PSI - Standard Model Review Lecture 7

Exotic topological order from quantum fractal code

12/13 PSI - Found Quantum Mechanics Lecture 6

12/13 PSI - String Theory Review Lecture 6

12/13 PSI - Standard Model Review Lecture 6

12/13 PSI - Found Quantum Mechanics Lecture 5

12/13 PSI - String Theory Review Lecture 5

12/13 PSI - Standard Model Review Lecture 5

New transport properties of holographic superfluids

12/13 PSI - Found Quantum Mechanics Lecture 4