Talks

9337 - 9348 of 18093 Results

Lorentzian non-locality and off-shell modes

Mehdi Saravani Goldman Sachs (United States)

May 22, 2014

PIRSA:14050132
Propagation of particles in discrete spacetime: Can high cosmic rays be a result of Quantum Gravity?

Nosiphiwo Zwane University of Eswatini

May 22, 2014

PIRSA:14050131
Projective Statistics in Quantum Gravity

Rafael Sorkin Perimeter Institute for Theoretical Physics

May 22, 2014

PIRSA:14050130
Change of vertex amplitude under coarse graining In Euclidean spinfoam model II

Andrzej Banburski Microsoft Corporation

May 22, 2014

PIRSA:14050129
Change of vertex amplitude under coarse graining In Euclidean spinfoam model I

Linqing Chen ETH Zurich

May 22, 2014

PIRSA:14050128
Reality Check for Quantum Gravity

Renate Loll Radboud Universiteit Nijmegen

May 22, 2014

PIRSA:14050138
What About Gravitizing Quantum Mechanics?

Laurent Freidel Perimeter Institute for Theoretical Physics

May 22, 2014

PIRSA:14050127
A mechanism for vortex annihilation in two dimensional superfluid turbulence

Andrew Lucas University of Colorado Boulder

May 22, 2014

PIRSA:14050139

General Relativity & Quantum Cosmology
Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

Atri Bhattacharya University of Liège

May 22, 2014

PIRSA:14050118

High Energy Physics
Positive Energy in Quantum Gravity

Lee Smolin Perimeter Institute for Theoretical Physics

May 21, 2014

PIRSA:14050126
Asymptotic safety – a quantum theory of gravity and matter

Astrid Eichhorn University of Southern Denmark

May 21, 2014

PIRSA:14050125
Phases for (analogue) spin foam models

Sebastian Steinhaus Friedrich Schiller University Jena

May 21, 2014

PIRSA:14050124

Lorentzian non-locality and off-shell modes

Mehdi Saravani Goldman Sachs (United States)

May 22, 2014

PIRSA:14050132
Propagation of particles in discrete spacetime: Can high cosmic rays be a result of Quantum Gravity?

Nosiphiwo Zwane University of Eswatini

May 22, 2014

PIRSA:14050131
Projective Statistics in Quantum Gravity

Rafael Sorkin Perimeter Institute for Theoretical Physics

May 22, 2014

PIRSA:14050130

To the extent that spacetime remains a manifold M on small scales, excitations of the spatial topology can function as particles called topological geons. In a first quantized theory of topological geons (aka continuum quantum gravity without topology change), different irreducible unitary representations of the mapping-class group G of M, yield different superselection sectors of the theory. In some of these sectors the geons behave as fermions, even though gravitons themselves are of course bosons. A still more exotic possibility is "projective statistics", where the operators that permute identical geons only preserve group multiplication up to a phase-factor that cannot be eliminated. (Such a representation must be nonabelian.) I will describe a simple example of this phenomenon with four RP^3 geons.
Change of vertex amplitude under coarse graining In Euclidean spinfoam model II

Andrzej Banburski Microsoft Corporation

May 22, 2014

PIRSA:14050129
Change of vertex amplitude under coarse graining In Euclidean spinfoam model I

Linqing Chen ETH Zurich

May 22, 2014

PIRSA:14050128
Reality Check for Quantum Gravity

Renate Loll Radboud Universiteit Nijmegen

May 22, 2014

PIRSA:14050138
What About Gravitizing Quantum Mechanics?

Laurent Freidel Perimeter Institute for Theoretical Physics

May 22, 2014

PIRSA:14050127
A mechanism for vortex annihilation in two dimensional superfluid turbulence

Andrew Lucas University of Colorado Boulder

May 22, 2014

PIRSA:14050139

General Relativity & Quantum Cosmology

Recent numerical simulations [1] have suggested that two dimensional superfluid turbulence is characterized by a direct cascade of energy to small length scales, in contrast to the inverse cascade of normal fluids, where energy is transported to large length scales. This direct cascade is characterized by many vortex-antivortex annihilation events. Recent experimental work [2] on Bose-Einstein condensates appears to demonstrate qualitatively similar physics. I will discuss recent work in progress towards identifying the physical mechanism underlying this direct cascade, using techniques of effective field theory.
Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

Atri Bhattacharya University of Liège

May 22, 2014

PIRSA:14050118

High Energy Physics

The IceCube detector has recently reported the observation of 28 events at previously unexplored energies. While the statistics of the observed events are still low, these events hint at the existence of a neutrino flux over and above the atmospheric neutrino background. We investigate the possibility that a significant component of the additional neutrino flux originates due to the decay of a very heavy dark matter (VHDM) particle via several possible channels into standard model particles. We show that a combination of a power law astrophysical neutrino spectrum and the neutrino flux from the decay of a DM species of mass in the range 150-400 TeV improves the fit to the observed neutrino events than that obtained from a best-fit astrophysical flux alone. Assuming the existence of an astrophysical background described by the IC best-fit, we also show that, for the decay of even heavier DM particles ($m_{\text{DM}} \sim 1$ PeV), the same observations impose significant constraints on the decay lifetimes. Allowing the astrophysical flux normalization to vary leads to modifications of these limits; however, there is still a range of dark matter mass and lifetime that is excluded by the IC results.
Positive Energy in Quantum Gravity

Lee Smolin Perimeter Institute for Theoretical Physics

May 21, 2014

PIRSA:14050126
Asymptotic safety – a quantum theory of gravity and matter

Astrid Eichhorn University of Southern Denmark

May 21, 2014

PIRSA:14050125
Phases for (analogue) spin foam models

Sebastian Steinhaus Friedrich Schiller University Jena

May 21, 2014

PIRSA:14050124

Title	Date	Collection	Type	Info
Lorentzian non-locality and off-shell modes	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
Propagation of particles in discrete spacetime: Can high cosmic rays be a result of Quantum Gravity?	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
Projective Statistics in Quantum Gravity	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
Change of vertex amplitude under coarse graining In Euclidean spinfoam model II	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
Change of vertex amplitude under coarse graining In Euclidean spinfoam model I	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
Reality Check for Quantum Gravity	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
What About Gravitizing Quantum Mechanics?	2014‑05‑22	Quantum Gravity Day 2014	Conference	View details
A mechanism for vortex annihilation in two dimensional superfluid turbulence	2014‑05‑22	Strong Gravity	Scientific Series	View details
Are the recent IceCube events hinting at O(100) TeV decaying dark matter?	2014‑05‑22	Particle Physics	Scientific Series	View details
Positive Energy in Quantum Gravity	2014‑05‑21	Quantum Gravity Day 2014	Conference	View details
Asymptotic safety – a quantum theory of gravity and matter	2014‑05‑21	Quantum Gravity Day 2014	Conference	View details
Phases for (analogue) spin foam models	2014‑05‑21	Quantum Gravity Day 2014	Conference	View details

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Format results

Lorentzian non-locality and off-shell modes

Propagation of particles in discrete spacetime: Can high cosmic rays be a result of Quantum Gravity?

Projective Statistics in Quantum Gravity

Change of vertex amplitude under coarse graining In Euclidean spinfoam model II

Change of vertex amplitude under coarse graining In Euclidean spinfoam model I

Reality Check for Quantum Gravity

What About Gravitizing Quantum Mechanics?

A mechanism for vortex annihilation in two dimensional superfluid turbulence

Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

Positive Energy in Quantum Gravity

Asymptotic safety – a quantum theory of gravity and matter

Phases for (analogue) spin foam models

Lorentzian non-locality and off-shell modes

Propagation of particles in discrete spacetime: Can high cosmic rays be a result of Quantum Gravity?

Projective Statistics in Quantum Gravity

Change of vertex amplitude under coarse graining In Euclidean spinfoam model II

Change of vertex amplitude under coarse graining In Euclidean spinfoam model I

Reality Check for Quantum Gravity

What About Gravitizing Quantum Mechanics?

A mechanism for vortex annihilation in two dimensional superfluid turbulence

Are the recent IceCube events hinting at O(100) TeV decaying dark matter?

Positive Energy in Quantum Gravity

Asymptotic safety – a quantum theory of gravity and matter

Phases for (analogue) spin foam models