Scientific Series

Displaying 3469 - 3480 of 4903

New developments in massive gravity
September 18, 2012

PIRSA:12090061
Astrophysics

General Relativity & Quantum Cosmology
Hamiltonian Theory of Fractional Chern Bands

Ramamurti Shankar Yale University
September 14, 2012

PIRSA:12090047
Mathematical Physics
Combinatorics and the thermodynamic limit for black holes in Loop Quantum Gravity

Fernando Barbero Spanish National Research Council (CSIC)
September 13, 2012

PIRSA:12090038
General Relativity & Quantum Cosmology
Charge fractionalization and entanglement entropy for compressible phases in holography

Liza Huijse Karius, Inc.
September 11, 2012

PIRSA:12090059
Condensed Matter
The Exploration of Hot QCD Matter

Berndt Mueller Duke University
September 11, 2012

PIRSA:12090046
High Energy Physics
Spectral distortions of the CMB and what we might learn about early universe physics

Jens Chluba University of Manchester
September 11, 2012

PIRSA:12090060
Astrophysics
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
Astrophysics
Fundamental quantum effects in the laboratory?

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

PIRSA:12080045
High Energy Physics
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
High Energy Physics
DT-invariants and $K_2$

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

PIRSA:12080009
Mathematical Physics

New developments in massive gravity
September 18, 2012

PIRSA:12090061
Astrophysics

General Relativity & Quantum Cosmology
The idea that the graviton may be massive has seen a resurgence of interest due to recent progress which has overcome its traditional problems. I will review this recent progress, which has led to a consistent ghost-free effective field theory of a massive graviton, with a stable hierarchy between the graviton mass and the cutoff, and how this theory has the potential to resolve the naturalness problem of the cosmological constant.
Hamiltonian Theory of Fractional Chern Bands

Ramamurti Shankar Yale University
September 14, 2012

PIRSA:12090047
Mathematical Physics
It has been known for some time that a system with a filled band will have an integer quantum Hall conductance equal to its Chern number, a toplogical index associated with the band. While this is true for a system in a magnetic field with filled Landau Levels, even a system in zero external field can exhibit the QHE if its band has a Chern number. I review this issue and discuss a more recent question of whether a partially filled Chern band can exhibit the Fractional QHE. I describe the work done with Ganpathy Murthy in which we show how composite fermions, which were so useful in explaining the usual FQHE, can be introduced here and with equal success by adapting our Hamiltonian Theory of CFs developed for the FQHE in the continuum.
Combinatorics and the thermodynamic limit for black holes in Loop Quantum Gravity

Fernando Barbero Spanish National Research Council (CSIC)
September 13, 2012

PIRSA:12090038
General Relativity & Quantum Cosmology
The combinatorial problems associated with the counting of black hole states in loop quantum gravity can be analyzed by using suitable generating functions. These not only provide very useful tools for exact computations, but can also be used to perform an statistical analysis of the black hole degeneracy spectrum, study the interesting substructure found in the entropy of microscopic black holes and its asymptotic behavior for large horizon areas. The methods that will be described are relevant for the discussion of the thermodynamic limit for black holes in the area canonical ensemble. This is an important issue in order to understand sub-leading corrections to the Bekenstein-Hawking law.
Charge fractionalization and entanglement entropy for compressible phases in holography

Liza Huijse Karius, Inc.
September 11, 2012

PIRSA:12090059
Condensed Matter
The Exploration of Hot QCD Matter

Berndt Mueller Duke University
September 11, 2012

PIRSA:12090046
High Energy Physics
When nuclear matter is heated beyond a temperature of 2 trillion
degrees, it converts into a strongly coupled plasma of quarks and
gluons, the sQGP. Experiments using highly energetic collisions
between heavy nuclei have revealed that this new state of matter is a
nearly ideal, highly opaque liquid. A description based upon string
theory and black holes in five dimensions has made the quark- gluon
plasma an iconic example of a strongly coupled quantum system. In this
lecture I will survey the observed properties of the sQGP in the light
of the latest results from RHIC and LHC. On the theoretical side, I
will discuss the thermalization and entropy production problem and
origin and role of event-by-event fluctuations.
Spectral distortions of the CMB and what we might learn about early universe physics

Jens Chluba University of Manchester
September 11, 2012

PIRSA:12090060
Astrophysics
The spectrum of the cosmic microwave background (CMB) is known to be extremely close to a perfect blackbody. However, even within standard cosmology several processes occurring in the early Universe lead to distortions of the CMB at a level that might become observable in the future. This could open an exciting new window to early Universe physics. In my talk I will then explain in more detail why the cooling of matter in the early Universe causes a negative mu- and y-type distortion and how the damping of primordial small-scale perturbations before recombination could allow placing interesting constraints on different inflationary models.
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
Astrophysics
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
High Energy Physics
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
High Energy Physics
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

Title	Speaker(s)	Date	Talk Type	Info link
New developments in massive gravity		2012-09-18	Scientific Series	View details
Hamiltonian Theory of Fractional Chern Bands	Ramamurti Shankar	2012-09-14	Scientific Series	View details
Combinatorics and the thermodynamic limit for black holes in Loop Quantum Gravity	Fernando Barbero	2012-09-13	Scientific Series	View details
Charge fractionalization and entanglement entropy for compressible phases in holography	Liza Huijse	2012-09-11	Scientific Series	View details
The Exploration of Hot QCD Matter	Berndt Mueller	2012-09-11	Scientific Series	View details
Spectral distortions of the CMB and what we might learn about early universe physics	Jens Chluba	2012-09-11	Scientific Series	View details
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

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New developments in massive gravity

Hamiltonian Theory of Fractional Chern Bands

Combinatorics and the thermodynamic limit for black holes in Loop Quantum Gravity

Charge fractionalization and entanglement entropy for compressible phases in holography

The Exploration of Hot QCD Matter

Spectral distortions of the CMB and what we might learn about early universe physics

Multiplets in the Entanglement Spectrum

Entropic uncertainty relations for quantum operations

Inflation from Magnetic Drift

Fundamental quantum effects in the laboratory?

Critical Collapse in the Axion-Dilaton System in Diverse Dimensions

DT-invariants and $K_2$

New developments in massive gravity

Hamiltonian Theory of Fractional Chern Bands

Combinatorics and the thermodynamic limit for black holes in Loop Quantum Gravity

Charge fractionalization and entanglement entropy for compressible phases in holography

The Exploration of Hot QCD Matter

Spectral distortions of the CMB and what we might learn about early universe physics

Multiplets in the Entanglement Spectrum

Entropic uncertainty relations for quantum operations

Inflation from Magnetic Drift

Fundamental quantum effects in the laboratory?

Critical Collapse in the Axion-Dilaton System in Diverse Dimensions

DT-invariants and $K_2$