Format results
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Aspects of Nonlinear Perturbations in Cosmological Models
Bojan Losic - University of Alberta
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Brane Gravity in Six Dimensional Flux Compactifications
Gianmassimo Tasinato - University of Oxford
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Non-Isotropy of the CMB Power Spectrum in Single Field Inflation
Andreas Ross - Carnegie Mellon University
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A Cosmological Sector in Loop Quantum Gravity
Tim Koslowski - Technical University of Applied Sciences Würzburg-Schweinfurt
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Emergence of a Background From Background Independent Quantum Gravity
Willem Westra - University of Iceland
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Non-Gaussianities from Multi-Field Inflation
Thorsten Battefeld - Brown University
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Bubble Nucleation and Eternal Inflation
Matthew Johnson - York University
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Superluminal - scalar fields and cosmology
Alex Vikman - New York University (NYU)
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Nongeometric Flux Compactifications
Brian Wecht - Queen Mary University of London
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Aspects of Nonlinear Perturbations in Cosmological Models
Bojan Losic - University of Alberta
I discuss two instances in which nonlinear perturbations in cosmological models are important. First, in de Sitter space-time, the bare necessity that the perturbations should be part of a consistent Taylor expansion of the field equations leads to the requirement, using the 'linearization stability… -
Brane Gravity in Six Dimensional Flux Compactifications
Gianmassimo Tasinato - University of Oxford
I consider a six dimensional space-time, in which two of the dimensions are compactified by a flux. Matter can be localized on a codimension one brane coupled to the bulk gauge field and wrapped around an axis of symmetry of the internal space. By studying the linear perturbations around this… -
Non-Isotropy of the CMB Power Spectrum in Single Field Inflation
Andreas Ross - Carnegie Mellon University
At large scales the CMB spectrum measured by WMAP appears to have an anomalously low power of the quadrupole and an asymmetry of power at l 40. We show that with an initial stage of fast roll of the inflation and a gradient in the initial conditions a simple chaotic inflation model may be capable… -
Kappa Deformed Field Theory
The description of noncommutative space will be given. I will show the relation between field theory on kappa-Minkowski space and the one in Minkowski. This construction leads to deformed energy momentum conservation law for energies close to the Planck scale. -
A Cosmological Sector in Loop Quantum Gravity
Tim Koslowski - Technical University of Applied Sciences Würzburg-Schweinfurt
A classical Hamiltonian system can be reduced to a subsystem of "relevant observables" using the pull-back under a Poisson embedding of the "relevant phase space" into the "full phase space". Since a quantum theory can be thought of a noncommutative phase space, one encounters the problem of the… -
Emergence of a Background From Background Independent Quantum Gravity
Willem Westra - University of Iceland
TBA -
Non-Gaussianities from Multi-Field Inflation
Thorsten Battefeld - Brown University
Non-Gaussianities are a generic prediction of multi-field inflationary models and within reach of upcoming experiments. After reviewing current observational limits and the physical origin of a non-zero three point correlation function, I will discuss the possibility of detectable non-Gaussian… -
Bubble Nucleation and Eternal Inflation
Matthew Johnson - York University
A number of mechanisms have been introduced in previous literature that might be responsible for transitions between metastable minima in a scalar field theory coupled to gravity. The connection between these transition mechanisms has remained unclear, and current formulations of eternal inflation… -
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Twistor-Inspired Approach to QCD and Supergravity
We will discuss applications of the recently developed twistor-space methods in perturbative quantum field-theory. The two central topics will be 1) the unitarity bootstrap approach to hard scattering amplitudes in QCD and 2) the analysis of the UV structure of N=8 supergravity. -
The Arrow of Time, Black Holes, and Quantum Mixing of Large N Yang-Mills Theories
Quantum gravity in an AdS space-time is described by an SU(N) Yang-Mills theory on a sphere, a bounded many-body system. We argue that in the high temperature phase the theory is intrinsically non-perturbative in the large N limit. At any nonzero value of the \\\'t Hooft coupling $lambda$, an…