Format results
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Holographic multiverse and the measure problem
Alexander Vilenkin - Tufts University
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Inside the horizon with holographic Wilsonian RG
Hong Liu - Massachusetts Institute of Technology (MIT) - Department of Physics
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Bubbles of nothing and the big bang
Adam Brown - Stanford University
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Lessons on Quantum Supergravity from Six-Dimensions
Daniel Park - Massachusetts Institute of Technology (MIT)
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The semiclassical wavefunction of the universe near de Sitter space
Juan Maldacena - Institute for Advanced Study (IAS) - School of Natural Sciences (SNS)
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Predictions from geometric cutoffs in Eternal Inflation
Ben Freivogel - Universiteit van Amsterdam
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The partition function of quantum de Sitter
Alejandra Castro - University of Cambridge
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Eternal inflation predicts that time will end
Stefan Leichenauer - Alphabet (United States)
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Fuzzy Twistors and Emergent Gravity
Herman Verlinde - Princeton University
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Holographic multiverse and the measure problem
Alexander Vilenkin - Tufts University
We explore the duality, conjectured in earlier work, between the wave function of the multiverse and a 3D Euclidean field theory on the future boundary of spacetime. We propose that a measure for the multiverse, which is needed in order to extract quantitative probabilistic predictions, can be… -
Inside the horizon with holographic Wilsonian RG
Hong Liu - Massachusetts Institute of Technology (MIT) - Department of Physics
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A de Sitter Farey Tail
Alexander Maloney - McGill University
We compute the partition function of quantum Einstein gravity in three dimensional de Sitter space. The Euclidean path integral is formulated as a sum over geometries, including both perturbative loop and non-perturbative instanton corrections coming from geometries with non-trivial topology. These… -
Lessons on Quantum Supergravity from Six-Dimensions
Daniel Park - Massachusetts Institute of Technology (MIT)
Six dimensional (1, 0) supergravity theories have received recent attention due to the fact that the strong constraints coming from anomalies severely restrict the theory. These constraints are restrictive enough that it is possible to get a rather good handle on the space of theories that do not… -
The semiclassical wavefunction of the universe near de Sitter space
Juan Maldacena - Institute for Advanced Study (IAS) - School of Natural Sciences (SNS)
We make some remarks about the semiclassical wavefunction of the universe around de-Sitter space. In five dimensional gravity with a positive cosmological constant it is possible to compute the full semiclassical measure for arbitrary geometries at superhorizon scales. In four dimensions, the same… -
The Hidden Phase Space of our Universe
By combining insights from black holes and string theory we argue for the existence of a hidden phase space associated with an underlying fast dynamical system, which is largely invisible from a macroscopic point of view. The dynamical system is influenced by slow macroscopic observables, such as… -
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The partition function of quantum de Sitter
Alejandra Castro - University of Cambridge
We propose that quantum gravity in de Sitter space should be de -
Eternal inflation predicts that time will end
Stefan Leichenauer - Alphabet (United States)
Present treatments of eternal inflation regulate infinities by imposing a geometric cutoff. We point out that some matter systems reach the cutoff in finite time. This implies a nonzero probability for a novel type of catastrophe. According to the most successful measure proposals, our galaxy is… -
Fuzzy Twistors and Emergent Gravity
Herman Verlinde - Princeton University
In this talk, I explain how twistors can be used to provide a covariant UV cut-off for 4-D gauge theory. I'll then motivate the conjecture that the cut-off gauge theory automatically contains 4-D Einstein gravity. As evidence, I describe how the theory reproduces the gravitational MHV amplitudes.