Collection Number
C12043
Collection Date

Collection Type
Conference/School
Experimental Search for Quantum Gravity
Effective field theory framework in QG

Xavier Calmet University of Sussex

Roberto Percacci SISSA Scuola Internazionale Superiore di Studi Avanzati

Astrid Eichhorn University of Southern Denmark

Martin Reuter Johannes GutenbergUniversität Mainz
Gravity Induced Grand Unification
Motivated by the lack of evidence for physics beyond the Standard Model in the TeV region, we discussed an alternative path for grand unification. We show that simple grand unification models based on e.g. SU(5) can work successfully even without low scale supersymmetry. In particular quantum gravitational effects could easily modify the unification conditions for the gauge and Yukawa couplings.
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Motivated by the lack of evidence for physics beyond the Standard Model in the TeV region, we discussed an alternative path for grand unification. We show that simple grand unification models based on e.g. SU(5) can work successfully even without low scale supersymmetry. In particular quantum gravitational effects could easily modify the unification conditions for the gauge and Yukawa couplings.
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Experimental tests of CPT symmetry
Antonio Di Domenico
Sapienza University of Rome
The three discrete symmetries of Quantum Mechanics, charge conjugation, parity, and time reversal, are all violated, singly or in pairs.
Quantum Gravity and the Weak Interactions

Lee Smolin Perimeter Institute for Theoretical Physics

Xavier Calmet University of Sussex

Stephon Alexander Brown University

Daniel Litim University of Sussex

Doug Gingrich University of Alberta

Dejan Stojkovic The State University of New York (SUNY)
Quantum Gravity and the Weak Interactions
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Nonthermal quantum black holes
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Nonthermal quantum black holes
Experimental search for quantum gravity  the hard facts
Hugo Beauchemin
University of Oxford
The LHC has been running for over 2 years and the different experiments have accumulated enough data to find a new particle which could well be the Higgs boson, achieve Standard Model measurements with precision at the percent level, and seriously constrain a large variety of new physics scenarios, giving important hints on what the physics beyond the Standard Model can be and what it cannot be. This presentation will focus on ATLAS and CMS latest searches for new physics in events featuring signatures relevant to theories of quantum gravity.
Lorentz symmetry: Broken, intact or deformed?

Rafael Sorkin Perimeter Institute for Theoretical Physics

Sabine Hossenfelder Frankfurt Institute for Advanced Studies (FIAS)

David Mattingly University of New Hampshire

Niayesh Afshordi University of Waterloo

Daniel Sudarsky Universidad Nacional Autónoma De Mexico (UNAM)

Stefano Liberati SISSA Scuola Internazionale Superiore di Studi Avanzati

Joao Magueijo Imperial College London
Is aether technically natural?
I will discuss whether higher energy Lorentz violation should be considered a natural expectation in theories of quantum gravity with a preferred frame.
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If spacetime is a causal set then Lorentz symmetry is unbroken
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Quantum superpositions of the speed of light
I will discuss whether higher energy Lorentz violation should be considered a natural expectation in theories of quantum gravity with a preferred frame.
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If spacetime is a causal set then Lorentz symmetry is unbroken
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Quantum superpositions of the speed of light
Astrophysical Searches for Quantum Gravity Signals
Jonathan Granot
University of Hertfordshire
Some recent searches for quantum gravity signatures using
observations of distant astrophysical sources will be discussed, focusing on
the search for Lorentz invariance violation (LIV) in the form of a dependence
of the photon propagation speed on its energy.
Dynamical Dimensional Reduction

Dejan Stojkovic The State University of New York (SUNY)

Astrid Eichhorn University of Southern Denmark

Martin Reuter Johannes GutenbergUniversität Mainz
Dynamical dimensional reduction and Asymptotic Safety
The effective average action approach to Quantum Einstein Gravity (QEG) is discussed as a natural framework for exploring the scale dependent Riemannian geometry and multifractal microstructure of the effective spacetimes predicted by QEG. Their fractal properties are related to the functional RG flow on theory space, and the special role of the running cosmological constant is emphasized. The prospects of an experimental verification will also be discussed.
The effective average action approach to Quantum Einstein Gravity (QEG) is discussed as a natural framework for exploring the scale dependent Riemannian geometry and multifractal microstructure of the effective spacetimes predicted by QEG. Their fractal properties are related to the functional RG flow on theory space, and the special role of the running cosmological constant is emphasized. The prospects of an experimental verification will also be discussed.
Cosmological Constant

Ivan Arraut Osaka City University

Stephon Alexander Brown University

Maite Dupuis Perimeter Institute for Theoretical Physics

Antonino Marciano Fudan University  Physics Department
Dark Matter and Dark Energy as a Possible Manifestation of a Fundamental Scale
If we take the idea of the Planck length as a fundamental (minimum) scale and if additionally we impose the Cosmological Constant ($Lambda$) as and infrared (IR) cutoff parameter. Then it is possible to demonstrate that Dark Matter effects can emerge as a consequence of an IRUV mix effect. This opens the possibility of unifying the Dark Energy and Dark matter effects in a single approach.
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If we take the idea of the Planck length as a fundamental (minimum) scale and if additionally we impose the Cosmological Constant ($Lambda$) as and infrared (IR) cutoff parameter. Then it is possible to demonstrate that Dark Matter effects can emerge as a consequence of an IRUV mix effect. This opens the possibility of unifying the Dark Energy and Dark matter effects in a single approach.
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Quantum Gravity Effects in Black Holes and Gravitational Waves

Giovanni AmelinoCamelia Sapienza Università di Roma  Dipartimento di Fisica

David Mattingly University of New Hampshire

Nicolas Yunes Montana State University

Avery Broderick Perimeter Institute for Theoretical Physics
Quantumgravity effects as noise for
gravitywave detectors
I discuss a mechanism that can allow Planck scale effects to manifest themselves as a source of loffrequency noise for interferometers. The mechanism requires a discrete formulation of dynamics at the Planck scale.
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Dancing in the Dark: Images of Quantum Black Holes
I discuss a mechanism that can allow Planck scale effects to manifest themselves as a source of loffrequency noise for interferometers. The mechanism requires a discrete formulation of dynamics at the Planck scale.
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Dancing in the Dark: Images of Quantum Black Holes
Searching for Quantum Gravity with the IceCube Neutrino Observatory
John Kelley
University of Wisconsin  Madison
The IceCube Neutrino Observatory is a cubickilometerscale neutrino detector built into the ice sheet at the geographic South Pole. Completed in December 2010, the detector consists of an array of photomultiplier tubes deployed along 86 cables ("strings") at depths of 1450 to 2450 m, as well as the IceTop air shower array of surface Cherenkov tanks. IceCube is detecting atmospheric neutrinos of energies above approximately 100 GeV at a rate of ~6 per hour, and is currently searching for extraterrestrial neutrinos from cosmic ray accelerators. A measurement of the atmospheric neutrino