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Search results in Astrophysics from PIRSA

1141 - 1152 of 2134 Results

Getting the Most out of a Black Hole

Alexander Tchekhovskoy Princeton University
March 04, 2013

PIRSA:13030102
Astrophysics
12/13 PSI - Cosmology Review Lecture 10

Latham Boyle University of Edinburgh
March 04, 2013

PIRSA:13030041
Astrophysics
12/13 PSI - Cosmology Review Lecture 9

Latham Boyle University of Edinburgh
March 01, 2013

PIRSA:13030038
Astrophysics
12/13 PSI - Cosmology Review Lecture 8

Latham Boyle University of Edinburgh
February 28, 2013

PIRSA:13020108
Astrophysics
12/13 PSI - Cosmology Review Lecture 7

Latham Boyle University of Edinburgh
February 27, 2013

PIRSA:13020107
Astrophysics
12/13 PSI - Cosmology Review Lecture 6

Latham Boyle University of Edinburgh
February 26, 2013

PIRSA:13020106
Astrophysics
Newton’s Method in Cosmology Today

Bill Harp Western University
February 26, 2013

PIRSA:13020151
Astrophysics
12/13 PSI - Cosmology Review Lecture 5

Latham Boyle University of Edinburgh
February 25, 2013

PIRSA:13020105
Astrophysics
Beyond Massive Gravity

Rachel Rosen Carnegie Mellon University
February 25, 2013

PIRSA:13020134
Astrophysics
Gamma Rays at 130 GeV and How They Might Come from Dark Matter

Andrew Frey University of Winnipeg
February 21, 2013

PIRSA:13020139
Astrophysics

General Relativity & Quantum Cosmology
12/13 PSI - Cosmology Review Lecture 3

Latham Boyle University of Edinburgh
February 21, 2013

PIRSA:13020101
Astrophysics
12/13 PSI - Cosmology Review Lecture 2

Latham Boyle University of Edinburgh
February 20, 2013

PIRSA:13020100
Astrophysics

Getting the Most out of a Black Hole

Alexander Tchekhovskoy Princeton University
March 04, 2013

PIRSA:13030102
Astrophysics
As black holes accrete surrounding gas, they often produce relativistic, collimated outflows, or jets. Jets are expected to form in the black hole vicinity making them powerful probes of strong-field gravity. However, how jet properties are connected to black hole and accretion flow properties has been unclear. Recent progress in computer simulations of black hole accretion enables studies of jet formation in unprecedented detail. For the first time, 3D general relativistic magnetohydrodynamic numerical simulations allow one to determine the maximum efficiency with which accretion onto black holes can power relativistic jets. I will present the dependence of this maximum efficiency on black hole spin and discuss how this dependence allows one to probe strong-field gravity. In realistic astrophysical systems, the angular momentum vector of the accretion flow can be tilted relative to the spin of the black hole. I will present the first simulations of jets from such tilted accretion systems and discuss their observational signatures.
12/13 PSI - Cosmology Review Lecture 10

Latham Boyle University of Edinburgh
March 04, 2013

PIRSA:13030041
Astrophysics
12/13 PSI - Cosmology Review Lecture 9

Latham Boyle University of Edinburgh
March 01, 2013

PIRSA:13030038
Astrophysics
12/13 PSI - Cosmology Review Lecture 8

Latham Boyle University of Edinburgh
February 28, 2013

PIRSA:13020108
Astrophysics
12/13 PSI - Cosmology Review Lecture 7

Latham Boyle University of Edinburgh
February 27, 2013

PIRSA:13020107
Astrophysics
12/13 PSI - Cosmology Review Lecture 6

Latham Boyle University of Edinburgh
February 26, 2013

PIRSA:13020106
Astrophysics
Newton’s Method in Cosmology Today

Bill Harp Western University
February 26, 2013

PIRSA:13020151
Astrophysics
Newton’s inferences from phenomena realize an ideal of empirical success that’s richer than prediction. To realize Newton’s richer conception of empirical success a theory needs to do more than to accurately predict the phenomena it purports to explain: in addition it needs to have the phenomena accurately measure parameters of the theory. Newton’s method aims to turn theoretical questions into ones which can be empirically answered by measurements from phenomena. Propositions inferred from phenomena are provisionally accepted as guides to further research. Newton’s ideal of empirical success as agreeing measurements from diverse phenomena is appealed to in support of the radical inference to dark energy in cosmology today. Robert Kirshner (two of his PhDs share one half of 2011’s Nobel Prize in physics) gave an account of the role of cosmic microwave background measurements, to back up the supernova measurements and measurements from galaxy clustering in supporting the transition of dark energy from a wild hypothesis into an accepted background assumption that guides further research in cosmology today. This illustrates a feature of agreeing measurements from diverse phenomena that is especially important for turning data into evidence. To the extent that the sources of systematic error of the different measurements can be regarded as independent, their agreement contributes additional support for counting them as accurate rather than as mere artifacts of systematic error.
12/13 PSI - Cosmology Review Lecture 5

Latham Boyle University of Edinburgh
February 25, 2013

PIRSA:13020105
Astrophysics
Beyond Massive Gravity

Rachel Rosen Carnegie Mellon University
February 25, 2013

PIRSA:13020134
Astrophysics
In the last few years there has been a burst of progress in the field of massive gravity. The construction of consistent theories in which the graviton has a small mass has in turn led to the development a new family of compelling, consistent low-energy modifications of General Relativity. These theories improve our understanding of the interplay between gravity and particle physics and provide new approaches to solving the cosmological constant problem. In this talk I will review these recent developments. I will discuss the search among these new theories for a symmetry that has the potential to address the cosmological constant problem.
Gamma Rays at 130 GeV and How They Might Come from Dark Matter

Andrew Frey University of Winnipeg
February 21, 2013

PIRSA:13020139
Astrophysics

General Relativity & Quantum Cosmology
Gamma Rays at 130 GeV and How They Might Come from Dark Matter" I'll discuss the exciting (but somewhat controversial) new discovery of a sharp gamma ray feature at 130 GeV from near the galactic center and review some other evidence that might link it to annihilation of dark matter. I will then explain the challenges in understanding how dark matter might produce this signal and explain a model or two that overcome these difficulties.
12/13 PSI - Cosmology Review Lecture 3

Latham Boyle University of Edinburgh
February 21, 2013

PIRSA:13020101
Astrophysics
12/13 PSI - Cosmology Review Lecture 2

Latham Boyle University of Edinburgh
February 20, 2013

PIRSA:13020100
Astrophysics

Title	Date	Collection	Type	Info
Getting the Most out of a Black Hole	2013‑03‑04	Colloquium	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 10	2013‑03‑04	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Cosmology Review Lecture 9	2013‑03‑01	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Cosmology Review Lecture 8	2013‑02‑28	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Cosmology Review Lecture 7	2013‑02‑27	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Cosmology Review Lecture 6	2013‑02‑26	12/13 PSI - Cosmology Review	Course	View details
Newton’s Method in Cosmology Today	2013‑02‑26	Cosmology and Gravitation	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 5	2013‑02‑25	12/13 PSI - Cosmology Review	Course	View details
Beyond Massive Gravity	2013‑02‑25	Colloquium	Scientific Series	View details
Gamma Rays at 130 GeV and How They Might Come from Dark Matter	2013‑02‑21	Strong Gravity	Scientific Series	View details
12/13 PSI - Cosmology Review Lecture 3	2013‑02‑21	12/13 PSI - Cosmology Review	Course	View details
12/13 PSI - Cosmology Review Lecture 2	2013‑02‑20	12/13 PSI - Cosmology Review	Course	View details

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Format results

Getting the Most out of a Black Hole

12/13 PSI - Cosmology Review Lecture 10

12/13 PSI - Cosmology Review Lecture 9

12/13 PSI - Cosmology Review Lecture 8

12/13 PSI - Cosmology Review Lecture 7

12/13 PSI - Cosmology Review Lecture 6

Newton’s Method in Cosmology Today

12/13 PSI - Cosmology Review Lecture 5

Beyond Massive Gravity

Gamma Rays at 130 GeV and How They Might Come from Dark Matter

12/13 PSI - Cosmology Review Lecture 3

12/13 PSI - Cosmology Review Lecture 2

Getting the Most out of a Black Hole

12/13 PSI - Cosmology Review Lecture 10

12/13 PSI - Cosmology Review Lecture 9

12/13 PSI - Cosmology Review Lecture 8

12/13 PSI - Cosmology Review Lecture 7

12/13 PSI - Cosmology Review Lecture 6

Newton’s Method in Cosmology Today

12/13 PSI - Cosmology Review Lecture 5

Beyond Massive Gravity

Gamma Rays at 130 GeV and How They Might Come from Dark Matter

12/13 PSI - Cosmology Review Lecture 3

12/13 PSI - Cosmology Review Lecture 2