Time: 2pm

Location: 2N36

Title: TBA

# Events

Time: 2pm

Location: 2N36

Title: TBA

Time: 2pm

Location: 2N36

Title: TBA

Time: 2pm

Location: 2N36

Title: TBA

Time: 2pm

Location: 2N36

Title: TBA

Time: 2pm

Location: 2N36

Title: TBA

Time: 2pm

Location: 2N36

**Title**: Recent developments in 3-D dualities

**Abstract**: This summer has seen a flurry of activity in particle-vortex duality and, more generally, in non-supersymmetric dualities in three spacetime dimensions. Much of this work has been directly related to the properties of so-called topological quantum matter and gapped phases of matter. In this talk, I will give a more-or-less pedagogical introduction to these ideas, beginning with the sine-Gordon/massive Thirring correspondence and building toward our current understanding of the 3-dimensional web of dualities.

Time: 2pm

Location: 2N36

Title: No-go results and promising directions in the space of causal diamonds

Abstract: The space of causal diamonds recently brought to attention by de Boer et al. and Czech et al. provides an organizing principle for the dependence of entanglement entropy in conformal field theories on the spatial subregion considered. I will show that the inclusion relation of causal diamonds does not give rise to a consistent notion of a causal structure and thus does not provide an alternate metric on this space. I will also show that the entanglement entropy of ball shaped regions is not enough to reconstruct the areas of higher dimensional bulk surfaces in a static geometry. Instead, I will provide a new direction for the reconstruction of the areas of bulk surfaces from boundary data in holography, using the shape derivatives of the entanglement entropy of nearly ball shaped regions.

Time: 2pm

Location: 2N36

Title: New forms of quantum entanglement in discretely gauged theories

Time: 2pm

Location: 2N36

Title: Entanglement growth in quantum quenches

Abstract: A global quench is an interesting setting where we can study thermalization of subsystems in a pure state. We investigate the spread of entanglement following a global quench in free field theory, holography, spin chains, and toy models. We find that the results in free scalar field theory are exactly reproduced by the model of free streaming quasiparticles, but strongly interacting chaotic systems spread entanglement more effectively. Based on recent insight into many-body quantum chaos, we propose two inequalities on the entropy, and suggest that the true evolution of the entropy is well approximated by saturating the combined bounds. A model based on the chaotic growth of operators saturates the combined bounds, and is a promising candidate to replace the quasiparticle model for chaotic systems.

Time: 2pm

Location: 2N36

Title: AdS_2 holography and non-extremal black holes

Abstract: I will present aspects of AdS_2 holography for a specific Einstein-Maxwell-Dilaton model that is obtained by Kaluza-Klein reduction from pure AdS_3 gravity with negative cosmological constant. In particular, I will derive the one-dimensional holographic dual for both running and constant dilaton solutions, and I will discuss the connection with the Sachdev-Ye-Kitaev model. Finally, I will explain how this dilaton gravity model provides a holographic description for four-dimensional asymptotically conformally AdS_2 x S^2 non-extremal black holes. The talk is based on the recent paper https://arxiv.org/abs/1608.07018.

Time: 2pm

Location: 2N36

Title: Entanglement, Holography and Causal Diamonds

Time: 2pm

Place: 2N36

Title: Tunneling in Quantum Field Theory and the Fate of the Universe

Abstract:

One of the most concrete implications of the discovery of the Higgs

boson is that, in the absence of physics beyond the standard model, the

long term fate of our universe can now be established through precision

calculations. Are we in a metastable minimum of the Higgs potential or

the true minimum? If we are in a metastable vacuum, what is its

lifetime? To answer these questions, we need to understand tunneling in

quantum field theory. As we delve into how tunneling works, we find many

unusual elements: complex quantities which should be real,

gauge-dependent quantities which should be physical, an hbar expansion

which differs from the ordinary loop expansion, and ultraviolet degrees

of freedom that don't decouple. This talk will discuss some of these

elements and present some new perspectives on quantum tunneling.

Time: 2pm

Place: 2N36

Title: "Bad Compactifications"

Abstract:

The parameter space of string compactifications contains a locus of

"bad" theories. These theories are physically the most interesting in

many ways. We analyze the bad locus of theories at various levels ---

where it is, it's multiplicity, and finally, we "categorify" it.

This is all done in the context of abelian gauged linear sigma models.

Time: 2pm

Place: 2N36

Title: Scrambling of locally perturbed thermal states

Abstract:

I will discuss the calculation of mutual information in 2d CFTs in the large c limit to determine the scrambling time scale at which it becomes small. Time permitting, I will make some remarks on the comparison between this approach and the calculation of out of time order correlators at finite temperature.

**Place:** DRL 4N12

**Thursday, April 7:**

**10:30-11am:** Welcome coffee

**11am -12:30pm:** Rob Myers (Perimeter)

Title: Scanning New Horizons: Information, Holography & Gravity

**12:30pm-2pm:** Catered lunch (in 4N12)

**2-3:30pm:** Matt Headrick (Brandeis)

Title: A new perspective on holographic entanglement

**3:30-4pm**: Coffee

**4-5:30pm:** Daniel Roberts (MIT)

Title: Chaos in quantum channels

**6:30pm:** Conference dinner at Han Dynasty

**Friday, April 8:**

**10:30-11am:** Welcome coffee

**11am -12:30pm:** Herman Verlinde (Princeton)

Title:

**12:30pm-1pm:** Catered lunch (in 4N12)

**1-2:30pm:** Jan de Boer (Amsterdam)

Title: Entanglement Holography

**3:30-4pm**: Coffee

**4-5:30pm:** Bartek Czech (Stanford)

Title: A stereoscopic look into the bulk

**End of the workshop**

Time: 3:30pm

Place: 4N12

Title: Strings, Exotics, and the 750 GeV Diphoton Excess

Abstract:

I first give a general review of the experimental, phenomenological, and theoretical status of

the possible diphoton excess at 750 GeV reported by CMS and ATLAS. I then describe work done in collaboration with Mirjam Cvetic and Jim Halverson (hep-ph/1512.07622 and 1602.06257) attempting to explain the excess in terms of the types of scalar particles and exotic vectorlike particles expected in a class of superstring constructions, taking into account experimental limits, expected Yukawa couplings, and perturbativity up to a large string scale.

Time: 2pm

Place: 2N36

Title: Effective field theory of dissipative fluids

Time: 2pm

Place:2N36

Title: Cross-Order Relations from Maximal Unitarity

Abstract:

I will devote the first part of the talk to a review of thegeneralized unitarity method for loop calculations, and of the originsof dual conformal invariance of amplitudes in planar N=4supersymmetric Yang-Mills theory. In the second half, I willdiscuss the use of maximal unitarity at two loops to reconstruct theABDK relation between one- and two-loop amplitudes in N=4supersymmetric Yang-Mills theory.

*The purpose of this meeting is to bring together experts working at the interface of cosmology, string theory and particle physics for a few days of informal talks and exchanges of ideas. The schedule will allow ample time for impromptu discussions and collaborations. Each talk includes ~60mins worth of presentation and interruptions, plus 30mins worth of questions/discussions.*

**Place:** DRL 4N12

**Thursday, December 3:**

**10:30-11am:** Welcome coffee

**11am -12:30pm:** Juan Maldacena (IAS)

Title: "Quantum mechanics and Cosmology: Entanglement and interference effects”

**12:30pm-2pm:** Catered lunch (in 4N12)

**2-3:30pm:** Erik Verlinde (Amsterdam)

Title: “Emergent Gravity and the Dark Universe”

**3:30-4pm**: Coffee

**4-5:30pm:** Liam McAllister (Cornell)

Title: "Planckian Axions and Quantum Gravity"

**6:30pm:** Conference dinner at Han Dynasty

**Friday, December 4:**

**10:30-11am:** Welcome coffee

**11am -12:30pm:** Gregory Gabadadze (NYU)

Title: "Metamorphosis of the Cosmological Constant"

**12:30pm-2pm:** Catered lunch (in 4N12)

**2-3:30pm:** Savdeep Sethi (Chicago)

Title: “Bounding the String Landscape”

**3:30-4pm**: Coffee

**4-5:30pm:** Mariangela Lisanti (Princeton)

Title: "Searching for Signals of Dark Matter in the Inner Galaxy"

**End of the workshop**