Scientific Series

Displaying 3649 - 3660 of 5113

Multiplets in the Entanglement Spectrum

Ari Turner Universiteit van Amsterdam

September 06, 2012

PIRSA:12090056
Entropic uncertainty relations for quantum operations

Karol Zyczkowski Jagiellonian University
September 05, 2012

PIRSA:12090057
Mathematical physics
Inflation from Magnetic Drift

Mark Wyman PDT Partners LLC
September 04, 2012

PIRSA:12090050
Cosmology
Fundamental quantum effects in the laboratory?

Ralf Schuetzhold Helmholtz-Zentrum Dresden-Rossendorf
August 30, 2012

PIRSA:12080045
Quantum Fields and Strings
Critical Collapse in the Axion-Dilaton System in Diverse Dimensions

Ehsan Hatefi The Abdus Salam International Centre for Theoretical Physics (ICTP)
August 30, 2012

PIRSA:12080044
Quantum Fields and Strings
DT-invariants and $K_2$

Maxim Kontsevich Institut des Hautes Etudes Scientifiques (IHES)
August 23, 2012

PIRSA:12080009
Mathematical physics
Where is the PdV term in the first law of black-hole thermodynamics?

Brian Dolan National University of Ireland

August 23, 2012

PIRSA:12080043
Resurgence from the path integral perspective

Maxim Kontsevich Institut des Hautes Etudes Scientifiques (IHES)
August 21, 2012

PIRSA:12080008
Mathematical physics
Exoplanet observation by microlensing and wave optics features

Sohrab Rahvar Sharif University of Technology

August 14, 2012

PIRSA:12080006
Universality in all-order alpha' corrections to BPS/non-BPS brane world volume theories

Ehsan Hatefi The Abdus Salam International Centre for Theoretical Physics (ICTP)
August 13, 2012

PIRSA:12080003
Quantum Fields and Strings
Topological Order in Spin Systems

Paul Fendley University of Oxford
August 10, 2012

PIRSA:12080002
Particle Physics
The closest cousins of quantum theory from three simple principles

Cozmin Ududec Government of the United Kingdom
August 07, 2012

PIRSA:12080007
Mathematical physics

Multiplets in the Entanglement Spectrum

Ari Turner Universiteit van Amsterdam

September 06, 2012

PIRSA:12090056

What information can be determined about a state given just the ground state wave function? Quantum ground states, speaking intuitively, contain fluctuations between many of the configurations one might want to understand. The information about them can be organized by introducing an imaginary system, dubbed the entanglement Hamiltonian. What light does the dynamics of this Hamiltonian (a precise version of the notion of "zero point motion") shed on the actual system?

I will start my discussion near critical points, where Lorentz invariance often emerges and the entanglement Hamiltonian becomes tractable, revealing that it exists in one dimension less than the real system. One application is to the fluctuations of angular momentum in a spin chain.

The entanglement Hamiltonian is especially successful at clarifying the properties of quantum phases without order, such as topological insulators. In particular, spin chains often have no long range order due to quantum fluctuations. Nevertheless there can be phase transitions between two of these disordered states, suggesting the existence of a hidden order.

My main aim in the talk will be to demonstrate that the entanglement spectrum can serve as an order parameter for these unusual transitions; this observation leads to a classification of one-dimensional phases. One can understand the phases of the actual system simply by looking at the spectrum of the entanglement Hamiltonian, just as one deduces the properties of atoms from their spectra.
Entropic uncertainty relations for quantum operations

Karol Zyczkowski Jagiellonian University
September 05, 2012

PIRSA:12090057
Mathematical physics
Inflation from Magnetic Drift

Mark Wyman PDT Partners LLC
September 04, 2012

PIRSA:12090050
Cosmology
I will describe a new, generic mechanism for realizing a period of slowly-rolling inflation through the use of an analog of 'magnetic drift.' I will demonstrate how the mechanism works through two particular worked examples: Chromo-Natural Inflation, which exists as a purely 4D effective theory, and a version that can appear naturally in string theory.
Fundamental quantum effects in the laboratory?

Ralf Schuetzhold Helmholtz-Zentrum Dresden-Rossendorf
August 30, 2012

PIRSA:12080045
Quantum Fields and Strings
There are several fundamental predictions of quantum field theory, such as Hawking radiation (i.e., black hole evaporation) or the Sauter-Schwinger effect (i.e., electron-positron pair creation out of the quantum vacuum by a strong electric field), which have so far eluded direct experimental verification.
However, it should be possible to gain some experimental access to these effects via suitable condensed matter analogues. In this talk, some possibilities for reproducing such fundamental
quantum effects in the laboratory are discussed.
Critical Collapse in the Axion-Dilaton System in Diverse Dimensions

Ehsan Hatefi The Abdus Salam International Centre for Theoretical Physics (ICTP)
August 30, 2012

PIRSA:12080044
Quantum Fields and Strings
We study the gravitational collapse of the axion-dilaton system suggested by type IIB string theory in dimensions ranging from four to ten. We extend previous analysis concerning the role played by the global SL(2, R) symmetry and also we explain ,why we do have three different assumptions(cases). We evaluate the Choptuik exponents in the elliptic case. Eventually we try to explain some of the open questions for two other assumptions and future directions.
DT-invariants and $K_2$

Maxim Kontsevich Institut des Hautes Etudes Scientifiques (IHES)
August 23, 2012

PIRSA:12080009
Mathematical physics
TBA
Where is the PdV term in the first law of black-hole thermodynamics?

Brian Dolan National University of Ireland

August 23, 2012

PIRSA:12080043

TBA
Resurgence from the path integral perspective

Maxim Kontsevich Institut des Hautes Etudes Scientifiques (IHES)
August 21, 2012

PIRSA:12080008
Mathematical physics
TBA
Exoplanet observation by microlensing and wave optics features

Sohrab Rahvar Sharif University of Technology

August 14, 2012

PIRSA:12080006

I will introduce the theory and experimental technique of extra-solar planet observation by the gravitational microlensing and give a report on recent results. Then I will discuss the wave optics features in the gravitational microlensing, the analogy of this effect in the astronomical scales to the Young's double slit experiment. Finally I will discuss about the possibility of observation of diffraction patterns in the microlensing experiment.
Universality in all-order alpha' corrections to BPS/non-BPS brane world volume theories

Ehsan Hatefi The Abdus Salam International Centre for Theoretical Physics (ICTP)
August 13, 2012

PIRSA:12080003
Quantum Fields and Strings
Knowledge of all-alpha' higher derivative corrections to leading order BPS and non-BPS brane actions would serve in future endeavor of determining the complete form of the non-abelian BPS and tachyonic effective actions. In this talk, we note that there is a universality in the all-alpha' order corrections to BPS and non-BPS branes. I talk about computing all amplitudes between one Ramond-Ramond C-field vertex operator and several SYM gauge/scalar vertex operators. Specifically, we evaluate in closed form string correlators of two-point amplitudes A^{C\phi}$, $\cal A^{CA}, a three-point amplitude A^{C\phi\phi} and a four-point amplitude A^{C\phi\phi\phi}. We carry out pole and contact term analysis. In particular we reproduce some of the contact terms and the infinite massless poles of A^{C\phi\phi\phi} by SYM vertices obtained through the universality.
Topological Order in Spin Systems

Paul Fendley University of Oxford
August 10, 2012

PIRSA:12080002
Particle Physics
Much effort has been devoted to the study of systems with topological order, motivated by practical issues as well as more field theoretical and mathematical concerns. This talk will give an overview of some of the field, describing abelian systems relevant to the search for spin liquids, and non-abelian systems relevant to topological quantum computation. I will focus in particular on problems not reducible to free-fermion ones; examples include the RVB state of electrons as well as models of quantum loops and nets.
The closest cousins of quantum theory from three simple principles

Cozmin Ududec Government of the United Kingdom
August 07, 2012

PIRSA:12080007
Mathematical physics
A very general way of describing the abstract structure of quantum theory is to say that the set of observables on a quantum system form a C*-algebra. A natural question is then, why should this be the case - why can observables be added and multiplied together to form any algebra, let alone of the special C* variety? I will present recent work with Markus Mueller and Howard Barnum, showing that the closest algebraic cousins to standard quantum theory, namely the Jordan-algebras, can be characterized by three principles having an informational ﬂavour, namely: (1) a generalized spectral decomposition, (2) a high degree of symmetry, and (3) a requirement on conditioning on the results of observations. I'll then discuss alternatives to the third principle, as well as the possibility of dropping it as a way of searching for natural post-quantum theories.

Title	Speaker(s)	Date	Talk Type	Info link
Multiplets in the Entanglement Spectrum	Ari Turner	2012-09-06	Scientific Series	View details
Entropic uncertainty relations for quantum operations	Karol Zyczkowski	2012-09-05	Scientific Series	View details
Inflation from Magnetic Drift	Mark Wyman	2012-09-04	Scientific Series	View details
Fundamental quantum effects in the laboratory?	Ralf Schuetzhold	2012-08-30	Scientific Series	View details
Critical Collapse in the Axion-Dilaton System in Diverse Dimensions	Ehsan Hatefi	2012-08-30	Scientific Series	View details
DT-invariants and $K_2$	Maxim Kontsevich	2012-08-23	Scientific Series	View details
Where is the PdV term in the first law of black-hole thermodynamics?	Brian Dolan	2012-08-23	Scientific Series	View details
Resurgence from the path integral perspective	Maxim Kontsevich	2012-08-21	Scientific Series	View details
Exoplanet observation by microlensing and wave optics features	Sohrab Rahvar	2012-08-14	Scientific Series	View details
Universality in all-order alpha' corrections to BPS/non-BPS brane world volume theories	Ehsan Hatefi	2012-08-13	Scientific Series	View details
Topological Order in Spin Systems	Paul Fendley	2012-08-10	Scientific Series	View details
The closest cousins of quantum theory from three simple principles	Cozmin Ududec	2012-08-07	Scientific Series	View details

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