The Geneva Symmetry Group, Beyond Spacetime, and the Space and Time After Quantum Gravity Project are happy to present the following talk:

Sebastian de Haro (University of Amsterdam and University of Cambridge):

Emergence in Gauge/Gravity Dualities

Thursday, 14 January 2016, 16:15

2, Rue De-Candolle, Room L107 [Map: http://www.openstreetmap.org/]

Anyone who wishes to attend this talk is welcome. The talk will be 4 Einsteins (out of 5).

Abstract: “Recent developments in gauge/gravity dualities suggest that renormalization group flows and the dynamics of spacetime are intimately related. The direction along which the theory’s couplings ‘flow’, typically an energy scale, is reinterpreted as a dimension (spatial or temporal) in which fields can evolve. It is often claimed that space, time, and-or gravity ‘emerge’ from a lower-dimensional theory in this way.

In this talk I will: (i) present a framework for discussing emergence in cases of duality; (ii) assess the claims of emergence in the best studied case of gauge/gravity duality: the AdS/CFT correspondence; (iii) comment on the possibility of carrying these ideas over to a cosmological context, viz. of de Sitter space-time.

Regarding (i): after introducing general notions of duality and emergence, I will argue that these two notions preclude one another. Coarse-graining will come to the rescue, suggesting two possible ways in which emergence can take place in the case of dualities (and I will argue that this exhausts the possibilities). Then I will: (ii) introduce holographic RG techniques as used in AdS/CFT. I will then employ the general framework of dualities and emergence to assess in what sense these are cases of emergence. In the last part of the talk, I will: (iii) discuss the conjectured dS/CFT correspondence for cosmological scenario’s. After (a) discussing some of the difficulties for holographic theories of de Sitter spacetime, I will (b) review current progress on two proposals for dS/CFT, and (c) discuss in what sense time can be said to emerge in such scenarios.”

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## About wuthrich

I am a philosopher of physics at the University of Geneva.