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John Donoghue (Unknown)20/06/2016, 14:00
I plan to use the introduction to review some past work on emergent symmetries. But then in the spirit of the workshop I will describe some ongoing work on a pathway to describe why general relativity appears as a metric theory, without initially making that assumption.
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Renata Loll20/06/2016, 15:30
Causal Dynamical Triangulations (CDT) is a candidate theory for quantum gravity, formulated nonperturbatively as scaling limit of a lattice theory in terms of triangulated spacetimes. I will describe briefly the rationale behind this approach and its ingredients, and will then summarize the status quo of what we have learned so far about its phase structure and dynamical behaviour, focusing...
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Cenke Xu21/06/2016, 10:00
By definition, a d-dimensional symmetry protected topological (SPT) phase must have nontrivial d-1 dimensional boundary states. The boundary of a large class of (3+1)d SPT phases can be described by a (2+1)d nonlinear sigma model (NLSM) with a topological Wess-Zumino-Witten (WZW) term. We will demonstrate that a stable strongly interacting (2+1)d conformal field theory (CFT) could emerge in...
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Dam Than Son21/06/2016, 11:30
Fractional quantum Hall liquids exhibit a rich set of excitations, the
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lowest-energy of which are the magneto-rotons with dispersion minima
at finite momentum. We propose a theory of the magneto-rotons on the
quantum Hall plateaux near half filling, namely, at filling fractions
$\nu=N/(2N+1)$ at large $N$. The theory involves an infinite number
of bosonic fields arising from bosonizing the... -
Román Orús22/06/2016, 10:00
In this talk I will make an overview of how space-time properties emerge from the entanglement structure of many-body wavefunctions. I will mainly focus on the connection between Entanglement Renormalization and AdS/CFT, but I will mention briefly other topics such as the appearance of spin networks in symmetric tensor networks, and the definition of "entanglement Hamiltonians" through a...
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Ben Freivogel (University of California at Berkeley)22/06/2016, 11:30
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José Ignacio Latorre (Universitat Barcelona)22/06/2016, 14:00
Maximal Entanglement appears to be a key ingredient for the emergence
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of symmetries. We first illustrate this phenomenon using two examples:
the emergence of conformal symmetry in condensed matter systems
and the relation of tensor networks to holography. We further present
a Principle of Maximal Entanglement that seems to dictate to a large
extend the structure of gauge symmetry. -
Julian Sonner (Universite de Geneve (CH))23/06/2016, 10:00
Holography allows us to formulate questions about quantum gravity in terms of more ordinary quantum field theories without gravity. A natural and long-standing goal has been to understand the physics of black holes using holographic duality. I will report on some recent progress on this question formulating the spherical collapse of an in-falling shell of null matter in three dimensions in...
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Jared Kaplan (SLAC)23/06/2016, 11:30
We discuss information loss from black hole physics
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in AdS_3, focusing on two sharp signatures infecting CFT_2 correlators
at large central charge c: 'forbidden singularities' arising from
Euclidean-time periodicity due to the effective Hawking temperature,
and late-time exponential decay in the Lorentzian region. We study an
infinite class of examples where forbidden singularities can... -
Petr Horava (University of California, Berkeley)23/06/2016, 14:00
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Joao Miguel Penedones (Universidade do Porto (PT))24/06/2016, 10:00
We consider QFT in hyperbolic space and study correlation functions of operators inserted at the conformal boundary. By construction, these observables transform like correlation functions of a lower dimensional Conformal Field Theory. We then apply conformal bootstrap techniques to find universal bounds on the mass spectrum and scattering amplitudes of the QFT. The AdS/CFT correspondence...
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Sunk-Sik Lee24/06/2016, 11:30
We show that renormalization group flow can be viewed as a gradual wave
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function collapse, where an initial state associated with the action of
field theory evolves toward a final state that describes an IR fixed
point. The process of collapse is described by the radial evolution in
the dual holographic theory. If the theory is in the same phase as the
assumed IR fixed point, the initial state... -
Javier Molina-Vilaplana27/06/2016, 10:00
Recently, new tools coming from quantum information theory have been used to understand the way spacetime could emerge from underlying microscopic building blocks. These tools allow to systematically analyze the structure of the quantum correlations in the quantum states of quantum many body systems in condensed matter and quantum field theories. Remarkably, it has been hypothesized that they...
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Yannick Meurice (University of Iowa)27/06/2016, 11:30
We reformulate the O(2) model with a chemical potential and the Abelian Higgs model using the
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Tensor Renormalization Group method (both on a 1+1 space-time lattice).
The reformulation allows exact blocking, is manifestly gauge invariant and connects smoothly the classical Lagrangian formulation
used by lattice gauge theorists to the quantum Hamiltonian method commonly used in condensed... -
Jörg Schmiedmayer27/06/2016, 14:00
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Igor Herbut (Simon Fraser University)28/06/2016, 10:00
I will review recent work on quantum criticality in three-dimensional gapless semiconductors, which feature quadratic band crossing at the fermi level. These rather ubiquitous systems, such as gray tin and mercury telluride, feature only a Galilean (z=2) invariance at low energies, and should exhibit interesting new phases and transitions as a result of electron-electron and electron-phonon...
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Xiao-Gang Wen28/06/2016, 11:30
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Fernando Pastawski29/06/2016, 10:00
In this talk I will take a quantum information perspective of static holography motivated by AdS/CFT yet agnostic of the underlying theory.
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This approach follows the recent trend of deriving the geometry of space from the entanglement structure of a critical boundary theory.
I will provide explicit examples of how these properties may be realized by QECCs obtained from tensor network... -
Diego Hofman (Princeton University)29/06/2016, 11:30
I will discuss a proof of bounds for central charges in unitary CFTs using crossing symmetry and its implication for the average null energy condition.
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Juan Maldacena (Unknown)29/06/2016, 14:00
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Leonardo Giusti (Universita & INFN, Milano-Bicocca (IT))30/06/2016, 10:00
By enforcing suitable relations associated to the Poincar\'e invariance
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of the continuum theory, it is possible to define an energy-momentum
tensor on the lattice which satisfies the appropriate Ward Identites and
has the right trace anomaly in the continuum limit. The renormalization
conditions come forth when the length of the box in the temporal direction
is finite, and they take a... -
Etsuko Itou (Kyoto University, YITP)30/06/2016, 11:30
Some non-abelian gauge theories coupled with many massless fermions show the conformal behavior in the low energy limit.
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The range of the number of fermions, where the theory has the nontrivial infrared fixed point, is called “conformal window".
Recent lattice studies confirm the existence of the conformal window from the first-principle calculation, and clarify those conformal properties,... -
Marco Serone (SISSA)01/07/2016, 10:00
We study the numerical bounds obtained using a conformal-bootstrap method where different points in the plane of conformal cross ratios are sampled. In contrast to previous methods, we can consistently
Go to contribution pageintegrate out" higher-dimensional operators and get a reduced simpler, and faster to solve, set of bootstrap equations. We test theeffective" bootstrap by studying the 3D Ising and O(n)... -
Stefano Liberati (SISSA)01/07/2016, 11:30
Analogue models of gravity have proved in the past formidable tool for testing quantum field theory in curved spacetime and the robustness of its phenomenology against UV physics.
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However, they can be also used as toy models for emergent gravity scenarios. In this talk I will discuss a few lessons which can be learned from these models and consider some of their phenomenological implications...
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