Experimental Search for Quantum Gravity 2007

24 talks

November 05, 2007 - November 09, 2007

C07024

Collection Type

Conference/School

Description

Experimental Search for Quantum Gravity

Displaying 13 - 24 of 24

Gravitational collapse in quantum gravity

Viqar Husain
University of New Brunswick
November 07, 2007

PIRSA:07110050
Quantum Gravity
Phenomenology of Discrete Space: Possible Tests

Seth Major
Hamilton College
November 07, 2007

PIRSA:07110051
Quantum Gravity
Black hole production at high energies

Steve Giddings
University of California, Santa Barbara
November 08, 2007

PIRSA:07110052
Quantum Gravity
Probing string theory through cosmological observations?

Robert Brandenberger
McGill University - Department of Physics
November 08, 2007

PIRSA:07110053
Quantum Gravity
Recent Results from the Pierre Auger Observatory.

Aaron Chou
New York University (NYU)
November 08, 2007

PIRSA:07110054
Quantum Gravity
Imprinting Short-Distance Physics on Long Distance Observables: Can this be consistent?

Richard Holman
Minerva University
November 08, 2007

PIRSA:07110055
Quantum Gravity
New physics from inflation

Ulf Danielsson
Uppsala University
November 08, 2007

PIRSA:07110056
Quantum Gravity
A perspective on Quantum Gravity Phenomenology

Giovanni Amelino-Camelia
Sapienza Università di Roma - Dipartimento di Fisica
November 09, 2007

PIRSA:07110057
Quantum Gravity
Summary

Lee Smolin
Perimeter Institute for Theoretical Physics
November 09, 2007

PIRSA:07100039
Quantum Gravity
An analogue model lesson for the cosmological constant

Stefano Liberati
SISSA International School for Advanced Studies
October 22, 2012

PIRSA:12100080
Cosmology
The cosmological constant and the emergence of the continuum

Lorenzo Sindoni
Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
October 22, 2012

PIRSA:12100081
Cosmology
Is spacetime fundamentally discrete?
- Bianca Dittrich
  Perimeter Institute for Theoretical Physics
- Seth Major
  Hamilton College
- Daniele Oriti
  Ludwig-Maximilians-Universität München (LMU)
- Roberto Percacci
  SISSA International School for Advanced Studies
- Tobias Fritz
  Universität Innsbruck
October 24, 2012

PIRSA:12100100
Mathematical physics

Gravitational collapse in quantum gravity

Viqar Husain
University of New Brunswick
November 07, 2007

PIRSA:07110050
Quantum Gravity
I will describe work aimed at understanding the dynamics of gravitational collapse in a fully quantum setting. Its emphasis is on the role played by fundamental discreteness. The approach used suggests modifications of a black hole\'s mass loss rate and thermodynamical properties. Numerical simulations of collapse with quantum gravity corrections indicate that black holes form with a mass gap.
Phenomenology of Discrete Space: Possible Tests

Seth Major
Hamilton College
November 07, 2007

PIRSA:07110051
Quantum Gravity
I will discuss possible tests of the grainularity of space including modified dispersion relations in the formation of white dwarfs and neutron stars and constraints on a stochastic direction field from atomic system tests.
Black hole production at high energies

Steve Giddings
University of California, Santa Barbara
November 08, 2007

PIRSA:07110052
Quantum Gravity
I will survey some of the physics of TeV-scale black hole production, as well as outstanding issues. I will also discuss some of the conceptual issues surrounding high-energy black hole production.
Probing string theory through cosmological observations?

Robert Brandenberger
McGill University - Department of Physics
November 08, 2007

PIRSA:07110053
Quantum Gravity
If string theory is the correct theory which unifies gravity with the other forces of nature at a quantum level, it should determine the evolution of the earliest stages of the universe. I will discuss how stringy signatures of this early phase may be visible in current cosmological observations.
Recent Results from the Pierre Auger Observatory.

Aaron Chou
New York University (NYU)
November 08, 2007

PIRSA:07110054
Quantum Gravity
Imprinting Short-Distance Physics on Long Distance Observables: Can this be consistent?

Richard Holman
Minerva University
November 08, 2007

PIRSA:07110055
Quantum Gravity
We use the example of inflationary physics to discuss the possibility that short distance physics might be imprinted on long-distance observables. In particular, we focus on issues involving decoupling in field theory.
New physics from inflation

Ulf Danielsson
Uppsala University
November 08, 2007

PIRSA:07110056
Quantum Gravity
I discuss how physics beyond the Planck scale and before inflation might leave an imprint on the primordial spectrum. There are interesting limitations connected with the information paradox that suggests unexpected new ways to test ideas on quantum gravity.
A perspective on Quantum Gravity Phenomenology

Giovanni Amelino-Camelia
Sapienza Università di Roma - Dipartimento di Fisica
November 09, 2007

PIRSA:07110057
Quantum Gravity
I discuss the status of Quantum Gravity Phenomenology, focusing separately on the 3 key areas: ability to discover, ability to constrain, and ability to falsify. And I stress the importance of adopting carefully taylored test theories as a remedy to difficulties encountered when comparing experimental evidence to theory evidence.
Summary

Lee Smolin
Perimeter Institute for Theoretical Physics
November 09, 2007

PIRSA:07100039
Quantum Gravity
An analogue model lesson for the cosmological constant

Stefano Liberati
SISSA International School for Advanced Studies
October 22, 2012

PIRSA:12100080
Cosmology
Analogue models of gravity have been a test field for many phenomena in quantum field theory on curved spacetimes. It was recently recognized that in some situations they can also provide toy models of emergent gravity. We shall review here such a model and address within it the nature and scale of the cosmological constrant trying to draw general lessons for emergent gravity scenarios.
The cosmological constant and the emergence of the continuum

Lorenzo Sindoni
Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
October 22, 2012

PIRSA:12100081
Cosmology
Naturalness problems that could be signaling the necessity a completion of an effective field theory with the introduction of an otherwise overlooked ingredient. The cosmological constant problem can be seen as a signal that the EFT for gravity, general relativity, is not correctly including the gravitational properties of the vacuum. Starting from the discussion of the a possible solution to this naturalness problem for a cc-like term in a BEC analogue model, I will briefly discuss how this particular mechanism can be extended, albeit in a preliminary form, to more genuine quantum gravity models like GFT, connecting in particular the problem of the determination of the gravitational couplings (and hence the hierarchies involved) to the appearance of a semiclassical space-time
Is spacetime fundamentally discrete?
- Bianca Dittrich
  Perimeter Institute for Theoretical Physics
- Seth Major
  Hamilton College
- Daniele Oriti
  Ludwig-Maximilians-Universität München (LMU)
- Roberto Percacci
  SISSA International School for Advanced Studies
- Tobias Fritz
  Universität Innsbruck
October 24, 2012

PIRSA:12100100
Mathematical physics
Modelling continuum dynamics on discrete space time
We will discuss perfect discretizations which aim at mirroring exactly continuum physics on a given lattice. Such discretizations avoid typical artifacts like Lorentz violation, energy dissipation, particle doubling and in particular breaking of diffeomorphism symmetry. Thus the question arises how to distinguish such lattice dynamics from continuum physics.

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Turning Weyl’s tile argument into a mathematically rigorous no-go theorem
Weyl's tile argument notes that if space was fundamentally discrete then the set of allowed velocities of a classical particle would not be isotropic. I will generalize Weyl's heuristic argument to a no-go theorem applying to any discrete periodic structure. Since this theorem does not take quantum mechanics into account it should only be regarded as the first step of a program of understanding the phenomenology of discrete spacetimes in a mathematically rigorous way.See arXiv:1109.1963

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On the Observability of Discrete Spatial Geometry
If quantum geometry is an accurate model of microscopic spatial geometry then two related questions arise, one observational and one theoretical: How and at what scale is the discreteness manifest? And, how is the general relativistic limit achieved? These questions will be discussed in the context of studies of a single atom of geometry. It will be shown that the effective scale of the discreteness could be much larger than the Planck scale. Before this scale can be predicted, the relations between discrete geometry, coherent states, and the semiclassical limit need to be clarified. Work towards this goal, using coherent states in spin foams and the spin geometry theorem of Penrose and Moussouris will be described.

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Asymptotic safety and minimal length
Since asymptotic safety - if true - would make a quantum field theory of gavity consistent "up to arbitrarily high energy", it would seem that this notion is incompatible with the existence of a minimal length. I will argue that this is not necessarily the case, due to ambiguity in the notion of minimal length.

Title	Speaker(s)	Date	Talk Type	Info
Gravitational collapse in quantum gravity	Viqar Husain	2007-11-07	Conference	View details
Phenomenology of Discrete Space: Possible Tests	Seth Major	2007-11-07	Conference	View details
Black hole production at high energies	Steve Giddings	2007-11-08	Conference	View details
Probing string theory through cosmological observations?	Robert Brandenberger	2007-11-08	Conference	View details
Recent Results from the Pierre Auger Observatory.	Aaron Chou	2007-11-08	Conference	View details
Imprinting Short-Distance Physics on Long Distance Observables: Can this be consistent?	Richard Holman	2007-11-08	Conference	View details
New physics from inflation	Ulf Danielsson	2007-11-08	Conference	View details
A perspective on Quantum Gravity Phenomenology	Giovanni Amelino-Camelia	2007-11-09	Conference	View details
Summary	Lee Smolin	2007-11-09	Conference	View details
An analogue model lesson for the cosmological constant	Stefano Liberati	2012-10-22	Conference	View details
The cosmological constant and the emergence of the continuum	Lorenzo Sindoni	2012-10-22	Conference	View details
Is spacetime fundamentally discrete?	Bianca Dittrich, Seth Major, Daniele Oriti, Roberto Percacci, Tobias Fritz	2012-10-24	Conference	View details

Experimental Search for Quantum Gravity 2007

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