PIRSA:C17015 - Shape Dynamics WorkshopPODCAST Subscribe to podcast

Shape Dynamics Workshop

Organizer(s): Henrique Gomes   Daniel Guariento   David Sloan   Lee Smolin  

Collection URL: http://pirsa.org/C17015

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PIRSA:17050043  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Shape Dynamics: Perspectives and Problems
Speaker(s): Julian Barbour
Abstract: Shape Dynamics(SD) can be derived from principles that differ in significant respects from Einstein's derivation of GR. It requires a spatially closed universe and allows a smaller set of solutions than GR does for this case. There are indications that its solution space can be fully characterized a... read more
Date: 15/05/2017 - 9:35 am

PIRSA:17050044  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The quantum equation of state of the universe produces a small cosmological constant
Speaker(s): Tim Koslowski
Abstract: Relationalism is the strict disentanglement of physical law from the definition of physical object. This can be formalized in the shape dynamcis postulate that the objective evolution of the universe is described by an "equation of state of a curve in relational configuration space." The application... read more
Date: 15/05/2017 - 11:00 am

PIRSA:17050045  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Inflationary and pre-inflationary dynamics with the Starobinsky potential
Speaker(s): Beatrice Bonga
Abstract: Inflation is the leading paradigm of the early Universe, according to which the tiny temperature fluctuations observed in the cosmic microwave background (CMB) originate from quantum vacuum fluctuations at very early times. Recent observations show that the Starobinsky potential is favored among the... read more
Date: 15/05/2017 - 2:00 pm

PIRSA:17050046  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Relationalism and the speed of light: Are we in a relationship?
Speaker(s): Yuri Bonder
Abstract: Most practical studies in Shape Dynamics involve an N-body Newtonian interaction which is described by a homogeneous potential. This property allows one to proof several interesting features like the emergence of an arrow of time. However, more generic interactions are not described by these kind of... read more
Date: 15/05/2017 - 2:45 pm

PIRSA:17050047  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Compact spherically symmetric solutions and gravitational collapse in SD
Speaker(s): Flavio Mercati
Abstract: I will review the current status of our understanding of spherically symmetric compact solutions of Shape Dynamics, which have nontrivial degrees of freedom when matter is present. I will show some new solutions of GR in a CMC foliation: a single thin spherical shell of matter in equilibrium in a co... read more
Date: 15/05/2017 - 4:00 pm

PIRSA:17050080  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Self-gravitating fluid solutions of Shape Dynamics
Speaker(s): Daniel Guariento
Abstract: Shape Dynamics possesses a large set of solutions in common with General Relativity. Upon close inspection, these solutions behave in surprising ways, so in order to probe the fitness of Shape Dynamics as a viable alternative to General Relativity one must understand increasingly complex solutions, ... read more
Date: 15/05/2017 - 4:45 pm

PIRSA:17050078  ( MP4 Medium Res , MP3 , PDF ) Which Format?
A Weyl-Type Theorem in Geometrized Newtonian Gravity, and How It May Bear on Shape Dynamics
Speaker(s): Erik Curiel
Abstract: The Weyl Theorem states that the conformal structure and the projective structure jointly suffice to fix the metric up to a global constant. This is a powerful interpretive tool in general relativity: it says in effect that if I know the paths of light rays in vacuo and I know the images of the pat... read more
Date: 15/05/2017 - 5:00 pm

PIRSA:17050048  ( MP4 Medium Res , MP3 , PDF ) Which Format?
What we know and don’t know about solutions to the Einstein Constraint Equations
Speaker(s): James Isenberg
Date: 16/05/2017 - 9:30 am

PIRSA:17050049  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Implications of a Frame-Dependent Dark Energy Action
Speaker(s): Steve Adler
Abstract: I review motivations for a frame-dependent dark energy action proportional to $int d^4x (-g)^{1/2}/g_{00}^2$, and discuss implications for the black hole horizon and for perturbations on the Robertson-Walker line element.
Date: 16/05/2017 - 11:00 am

PIRSA:17050051  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Renormalization Group flows of spacetime
Speaker(s): Astrid Eichhorn
Abstract: I will discuss the use of (functional) Renormalization Group in models of quantum gravity. I will highlight the challenges that occur in continuum approaches to quantum gravity, such as asymptotically safe gravity, as well as challenges in discrete approaches, such as tensor models.
Date: 16/05/2017 - 2:00 pm

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