Talks

11473 - 11484 of 20132 Results

14/15 PSI - Complex Analysis 3

Tibra Ali Perimeter Institute for Theoretical Physics

August 14, 2014

PIRSA:14080011
CMB anomalies from primordial gravitational waves

Yi Wang Hong Kong University of Science and Technology

August 13, 2014

PIRSA:14080019

Astrophysics
14/15 PSI - Classical Mechanics 2

David Kubiznak Charles University

August 13, 2014

PIRSA:14080014
14/15 PSI - Complex Analysis 2

Tibra Ali Perimeter Institute for Theoretical Physics

August 13, 2014

PIRSA:14080010
Reconstructing quantum states from local data

Isaac Kim University of California, Davis

August 12, 2014

PIRSA:14080007

Condensed Matter
14/15 PSI - Classic Mechanics 1

David Kubiznak Charles University

August 12, 2014

PIRSA:14080009
14/15 PSI - Complex Analysis 1

Tibra Ali Perimeter Institute for Theoretical Physics

August 12, 2014

PIRSA:14080008
Algebraic Geometry in Cosmology

Matilde Marcolli University of Toronto

August 07, 2014

PIRSA:14080002

Astrophysics
Criterion for non-Fermi Liquid behavior in a metal with broken symmetry

Ashvin Vishwanath Harvard University

August 06, 2014

PIRSA:14080004

Condensed Matter
Probing the Physics of Active Galaxies Using Multi-wavelength Data

Prajval Shastri Indian Institute of Astrophysics

August 05, 2014

PIRSA:14080000

Astrophysics
Uni10 Tensor Network Library

Ying-Jer Kao National Taiwan University

August 05, 2014

PIRSA:14080001

Condensed Matter
Physical Hilbert space for the affine group formulation of 4D, gravity of Lorentzian signature.

Eyo Ita US Naval Academy and Cambridge University (DAMTP)

July 31, 2014

PIRSA:14070033

General Relativity & Quantum Cosmology

14/15 PSI - Complex Analysis 3

Tibra Ali Perimeter Institute for Theoretical Physics

August 14, 2014

PIRSA:14080011
CMB anomalies from primordial gravitational waves

Yi Wang Hong Kong University of Science and Technology

August 13, 2014

PIRSA:14080019

Astrophysics

We relate CMB anomalies and the recent observational evidence of primordial gravitational
waves. Two aspects are investigated:

(a) Several anomalies are spotted on the low ell temperature map of the WMAP and Planck
experiments. However, those anomalies disappear at high ell. We propose that those low ell
temperature anomalies may come from nearly scale invariant anomalies of the tensor sector.
Those anomalies on the temperature map naturally decay towards small scales, characterized
by the tensor-to-temperature radiation transfer function.

(b) The anomalies introduced by the gravitational waves discovery. Strong tension is noticed
between the BICEP2 and Planck data. We study in detail how blue tilt of the tensor spectrum
reconciles the tension between those datasets.
14/15 PSI - Classical Mechanics 2

David Kubiznak Charles University

August 13, 2014

PIRSA:14080014
14/15 PSI - Complex Analysis 2

Tibra Ali Perimeter Institute for Theoretical Physics

August 13, 2014

PIRSA:14080010
Reconstructing quantum states from local data

Isaac Kim University of California, Davis

August 12, 2014

PIRSA:14080007

Condensed Matter

We consider the problem of reconstructing global quantum states from local data. Because the reconstruction problem has many solutions in general, we consider the reconstructed state of maximum global entropy consistent with the local data. We show that unique ground states of local Hamiltonians are exactly reconstructed as the maximal entropy state. More generally, we show that if the state in question is a ground state of a local Hamiltonian with a degenerate space of locally indistinguishable ground states, then the maximal entropy state is close to the ground state projector. We also show that local reconstruction is possible for thermal states of local Hamiltonians. Finally, we discuss a procedure to certify that the reconstructed state is close to the true global state. We call the entropy of our reconstructed maximum entropy state the "reconstruction entropy", and we discuss its relation to emergent geometry in the context of holographic duality. This is a joint work with Brian Swingle.
14/15 PSI - Classic Mechanics 1

David Kubiznak Charles University

August 12, 2014

PIRSA:14080009
14/15 PSI - Complex Analysis 1

Tibra Ali Perimeter Institute for Theoretical Physics

August 12, 2014

PIRSA:14080008
Algebraic Geometry in Cosmology

Matilde Marcolli University of Toronto

August 07, 2014

PIRSA:14080002

Astrophysics

The talk is based on joint work with Yuri Manin (arXiv:1402.2158). Using algebro-geometric blowups it is possible to construct a family of models of gluing of aeons across a Big-Bang type singularity, which includes the case of Penrose's conformally cyclic cosmology, as well as inflationary multiverse models generalizing the "eternal symmetree", and BKLL mixmaster type cosmologies. Using the mixmaster dynamics, formulated in terms of elliptic curves and modular curves, we speculate on the geometry of cosmological time near the gluing of aeons. We show also that this type of model allows for phenomena of noncommutativity of spacetime coordinates near the Big-Bang and the crossing of aeons.
Criterion for non-Fermi Liquid behavior in a metal with broken symmetry

Ashvin Vishwanath Harvard University

August 06, 2014

PIRSA:14080004

Condensed Matter
Probing the Physics of Active Galaxies Using Multi-wavelength Data

Prajval Shastri Indian Institute of Astrophysics

August 05, 2014

PIRSA:14080000

Astrophysics

Accreting supermassive black holes in the centres of galaxies (i.e. Active Galactic Nuclei - AGN) are now known to play a prominent role in the growth of galaxies through cosmic time. The fundamental parameters to explain the whole range of observed properties of these accreting systems, however, is still elusive. We will present some results from multi-wavelength investigations of the nature of accreting supermassive black holes, including those that produce low kinetic power jets as well as high kinetic power, relativistic jets.
Uni10 Tensor Network Library

Ying-Jer Kao National Taiwan University

August 05, 2014

PIRSA:14080001

Condensed Matter
Physical Hilbert space for the affine group formulation of 4D, gravity of Lorentzian signature.

Eyo Ita US Naval Academy and Cambridge University (DAMTP)

July 31, 2014

PIRSA:14070033

General Relativity & Quantum Cosmology

The authors have revealed a fundamental structure which has been hidden within the Wheeler-DeWitt (WDW) constraint of four dimensional General Relativity (GR) of Lorentzian signature in the Ashtekar self-dual variables. The WDW equation can be written as the commutator of two geometric entities, namely the imaginary part of the Chern-Simons functional Q and the local volume element V(x) of 3-space. Upon quantization with cosmological constant, the WDW equation takes on the form of the Lie algebra of the affine group of transformations of the straight line, with Q and V(x) playing the role of the generators for the Lie algebra. The generators are Hermitian, which addresses the issue of the implementation of the reality conditions of GR at the quantum level. Additionally, the irreducible unitary representations (IUR) implement the positivity of the spectrum of the volume operator V(x) at the quantum level This development has led to the existence of elements of the physical Hilbert space for four dimensional gravity of Lorentzian signature, the full theory, in the form of irreducible, unitary representations of the affine group of transformations of the straight line. The affine Lie algebraic structure of the WDW equation remains intact even in the presence of nongravitational fields. This feature has led to the extension of the affine group formulation to elements of the physical Hilbert space for gravity coupled to the full Standard Model of particle physics, quantized on equal footing. Work on the physical interpretation of the states with respect to gauge-diffeomorphism invariant observables, and spacetime geometries solving the Einstein equations is in progress. The journal reference for these results are as follows: - The first result has been published in CQG 30 (2013) 065013 - The second result has just been published in Annals of Physics Journal Vol.343, pages 153-163, April 2014

Title	Date	Collection	Type	Info
14/15 PSI - Complex Analysis 3	2014‑08‑14	14/15 PSI - Front End	Other	View details
CMB anomalies from primordial gravitational waves	2014‑08‑13		Scientific Series	View details
14/15 PSI - Classical Mechanics 2	2014‑08‑13	14/15 PSI - Front End	Course	View details
14/15 PSI - Complex Analysis 2	2014‑08‑13	14/15 PSI - Front End	Other	View details
Reconstructing quantum states from local data	2014‑08‑12	Quantum Matter	Scientific Series	View details
14/15 PSI - Classic Mechanics 1	2014‑08‑12	14/15 PSI - Front End	Course	View details
14/15 PSI - Complex Analysis 1	2014‑08‑12	14/15 PSI - Front End	Course	View details
Algebraic Geometry in Cosmology	2014‑08‑07	Cosmology and Gravitation	Scientific Series	View details
Criterion for non-Fermi Liquid behavior in a metal with broken symmetry	2014‑08‑06	Quantum Matter	Scientific Series	View details
Probing the Physics of Active Galaxies Using Multi-wavelength Data	2014‑08‑05	Cosmology and Gravitation	Scientific Series	View details
Uni10 Tensor Network Library	2014‑08‑05	Quantum Matter	Other	View details
Physical Hilbert space for the affine group formulation of 4D, gravity of Lorentzian signature.	2014‑07‑31	Quantum Gravity	Scientific Series	View details

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Format results

14/15 PSI - Complex Analysis 3

CMB anomalies from primordial gravitational waves

14/15 PSI - Classical Mechanics 2

14/15 PSI - Complex Analysis 2

Reconstructing quantum states from local data

14/15 PSI - Classic Mechanics 1

14/15 PSI - Complex Analysis 1

Algebraic Geometry in Cosmology

Criterion for non-Fermi Liquid behavior in a metal with broken symmetry

Probing the Physics of Active Galaxies Using Multi-wavelength Data

Uni10 Tensor Network Library

Physical Hilbert space for the affine group formulation of 4D, gravity of Lorentzian signature.

14/15 PSI - Complex Analysis 3

CMB anomalies from primordial gravitational waves

14/15 PSI - Classical Mechanics 2

14/15 PSI - Complex Analysis 2

Reconstructing quantum states from local data

14/15 PSI - Classic Mechanics 1

14/15 PSI - Complex Analysis 1

Algebraic Geometry in Cosmology

Criterion for non-Fermi Liquid behavior in a metal with broken symmetry

Probing the Physics of Active Galaxies Using Multi-wavelength Data

Uni10 Tensor Network Library

Physical Hilbert space for the affine group formulation of 4D, gravity of Lorentzian signature.