Gravitational Thermodynamics and the Quantum Nature of Space Time

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Gravitational Thermodynamics and the Quantum Nature of Space Time

 16 - 20 Jun 2008
 The Alrick Building, The King's Buildings, University of Edinburgh

Organiser

Name
Institution
de Wit, BernardUtrecht University
Figueroa-O'Farrill, JoséUniversity of Edinburgh
Simón, JoanUniversity of Edinburgh

Copies of slides are now available via links within the timetable

String theory is a structurally rich theoretical framework in which a nontrivial extension of GR can be quantised. String theory has already led to a number of remarkable insights into the nature of the degrees of freedom (in the form of branes) underlying a black hole and into the resolution of timelike and null singularities, all without violating unitarity. These successes notwithstanding, important challenges remain, such as to understand

  • space-like singularities, and more generally, time-dependent processes such as the microscopic interpretation of cosmological horizons;
  • the observables of a generic background and their relation to the holographic principle;
  • the relation of the latter with the thermodynamical description of cosmological horizons;
  • the nonlocal nature of charges in GR; and
  • the appearance of space time as an emergent concept and not as an a priori entity as in GR.

This workshop will be devoted to the above list of challenges, all of which are directed towards a better understanding of the quantum nature of space time and of the emergence of lorentzian geometry in the classical limit. There will be a contribution to local costs (including accommodation and some subsistence) from awards to ICMS and a small registration fee will be payable by all delegates. Participation is by invitation only.

Supporting Institutions:
EPSRC
LMS
Edinburgh Mathematical Society
IOP

 

Arrangements

Venue
The workshop will be held the Alrick Building, The Kings Buildings, off Mayfield Road, Edinburgh, EH9 3JZ. King's Building's is the University of Edinburgh's south campus and is indicated by an arrow on this map of the city. Please note that you should enter the campus by Gate 4 on Mayfield Road; the Alrick Building is located on the right as you walk up the driveway at Gate 4. All lectures will take place in Classroom 10 on the ground floor of the Alrick Building, just inside the main entrance. Classroom 10 is equipped with a data projector, blackboards and an overhead projector. A laptop will be available for your use. Follow this link for information about the facilities at King's Builidngs.

Travel
Information about travel to the UK and Edinburgh is available here.

If you have requested accommodation (see below), travel information and directions to Pollock Halls can be found on the website for Edinburgh First, who co-ordinate the accommodation bookings, http://www.edinburghfirst.com/edinburghfirst/travel.asp . We recommend that you take a taxi to the Halls. It should cost around 5.00 GBP from the main railway station (Waverley Station) and between 16.00 and 20.00 GBP from Edinburgh airport. Alternatively there are frequent buses from the airport to Waverley Station, from where you can get a taxi to Pollock Halls.

Pollock Halls is approximately a 25 minute walk from the conference at Alrick Building. The second of these two maps of Pollock Halls shows the accommodation in relation to the location of the workshop at Kings Buildings (indicated at the very foot of the map). To walk, exit Pollock by Holyrood Park Road, cross Dalkeith Road and walk along Salisbury Road/Place until you reach Causewayside. Follow Causewayside away from the town centre until it becomes Mayfield Road. Enter King's Buildings campus by Gate 4. Alternatively, walk to Causewayside and get the 42 bus out to King's Buildings.

To get to the King's Building campus from the City Centre, take Lothian buses 42 or 24 from Hanover Street, just off Princes Street (42 is quicker!). Lothian buses charge £1.10 for a single, £2.50 for a day ticket. Please note that the exact fare is required - no change is given.

Accommodation
ICMS will reserve bedrooms for participants who indicate this preference on the on-line registration form. The rooms are hotel style, en-suite, and are located within Chancellor's Court which is superior, university accommodation at Pollock Halls of Residence. All rooms have a private shower, toilet, tea/coffee making facilities, TV and a telephone. A picture of a typical room is available here.

Pollock Halls of Residence
18 Holyrood Park Road
Edinburgh, EH16 5AY
Reception Contact Numbers
+44 (0)131 667 1971 (Tel)
+44 (0)131 668 3217 (Fax)

On arrival at Pollock Halls, please go to the Reception Building on your left, where you will pick up your key and some further information. You can get into your room after 14.00. If you arrive earlier you can leave your luggage at Reception. Pollock Halls has 24 hour reception.

Alternatively, participants may make their own accommodation arrangements; a list of Edinburgh accommodation of various sorts and prices can be found on the Accommodation Page on the ICMS website. Section 4 is particularly relevant. Early booking is advised.

Meals and Refreshments
A sandwich lunch will be provided on the first day of the workshop, Monday 16 June. For the remainder of the days, participants are free to go out for lunch and explore the sandwich shops and bars around the campus.

Morning and afternoon refreshments will be provided throughout the workshop.

A workshop dinner will take place at Blonde Restaurant on the evening of Thursday 19 June.

Public Lecture by Leonard Susskind
Photo Gallery from this event
At 18.00 on Monday 16 June, Leonard Susskind, the Felix Bloch Professor of Theoretical Physics at Stanford University, will give a lecture at The Royal Society of Edinburgh (RSE), 22-26 George Street, Edinburgh. This is a joint event with the RSE and ICMS with support from the Edinburgh Mathematical Society (EMS). The lecture is entitled "The black hole war: the war that made the world safe for quantum mechanics" and further information about the lecture can be found here.

All workshop participants are invited to attend and seats have been reserved in the Lecture Theatre at the RSE (there is no need for you to inform us of your wish to attend). Following the lecture, at 19.00, there will be an informal wine reception at the RSE for workshop participants and any members of the public who have attended the lecture.

A coach has been organised to transport participants from the workshop venue at the Alrick Building to the RSE. The coach will depart from the Alrick Building at 17.15. The coach journey is one-way only as it is anticipated that participants will want to dine out in central Edinburgh after the lecture and wine reception.

Computer access
At Registration you will be issued with a username and password which will enable you to access either the wireless network or a public PC. The Alrick Building is within a wireless zone as are parts of Pollock Halls.

Financial Matters
The workshop grant will cover the cost of your single en-suite bed and breakfast accommodation at Pollock Halls for the duration of the workshop. Refreshments, lunch on the first day, the Monday evening wine reception at the RSE, and the workshop dinner will also be covered.

If you have been notified that you will receive reimbursement as a contribution towards travel costs, a claim form will be issued at Registration. You will be reimbursed after the workshop directly into your bank account in the currency of your choice. It will be useful if you bring your bank details to the workshop. Please note that receipts are required for all items claimed.

A registration fee of 40.00 GBP will be payable by all delegates unless otherwise stated in your invitation email. This can be paid at Registration by cash, sterling cheque or by giving credit/debit card details. If you would like to pay in advance, please complete this credit/debit card form and fax it to ICMS. The fax number is on the form. Please note that it is not secure to send your credit card details by email.

Programme

Monday 16 June

10.00 - 11.15

Registration and coffee

11.15 - 11.30

Introduction and welcome

11.30 - 12.30

Roberto Emparan (ICREA & Universitat de Barcelona)
New phases of black holes in higher dimensions Link to pdf file of related slides

12.30 - 14.30

Lunch provided in Seminar Room D/E

14.30 - 15.30

Jan de Boer (Institute for Theoretical Physics, Amsterdam)
Quantization of gravitational solutions

15.30 - 16.00

Coffee, tea and biscuits in Seminar Room D/E

16.00 - 16.30

Vishnu Jejjala (Institut des Hautes Études Scientifiques (IHES)
Entropy of near-extremal black holes in AdS_5

16.30 - 17.00

Justin David (Indian Institute of Science, Bangalore & Harish-Chandra Research Insitute, Allahabad)
On the partition function of dyons in N=2 string theories

17.15

Coach to RSE departs from Alrick Building

18.00 - 19.00

Public Lecture in the Lecture Theatre, RSE, 22-26 George Street Photo Gallery

19.00 - 20.00

Wine Reception in the Wellcome Room, RSE

 

Tuesday 17 June

10.00 - 11.00

Per Kraus (University of California, Los Angeles (UCLA))
Stringy Black Holes in 5D
Link to pdf file of related slides

11.00 - 11.30

Coffee, tea and biscuits in Seminar Room D/E

11.30 - 12.00

Marcos Mariño (University of Geneva)
Topological strings, black holes and emergent spacetime Link to pdf file of related slides

12.00 - 12.30

Boris Pioline (LPTHE & LPTENS, Paris)
Instanton corrections and black hole partition functions Link to pdf file of related slides

12.30 - 14.30

Lunch break

14.30 - 15.30

Sumit Das (University of Kentucky)
Gauge gravity duality and cosmological singularities Link to pdf file of related slides

15.30 - 16.00

Coffee, tea and biscuits in Seminar Room D/E

16.00 - 16.30

Ben Craps (Vrije Universiteit Brussel)
Quantum propagation across cosmological singularities Link to pdf file of related slides

16.30 - 17.00

Chong-Sun Chu (Durham University)
Time-dependent AdS/CFT duality and null singularity Link to pdf file of related slides

 

Wednesday 18 June

10.00 - 11.00

Gabriel Cardoso (University of Munich)
On non-holomorphic corrections to black hole partition functions Link to pdf file of related slides

11.00 - 11.30

Coffee, tea and biscuits in Seminar Room D/E

11.30 - 12.00

Finn Larsen (University of Michigan and CERN)
Black holes in four dimensions: the non-BPS branch

12.00 - 12.30

Jerome Gauntlett (Imperial College London)
AdS solutions and transgression Link to pdf file of related slides

12.30 - 14.00

Lunch break

14.00 - 14.30

Djordje Minic (Virginia Polytechnic Institute and State University)
On the origin of the universe and the dark energy

14.30 - 15.00

Henriette Elvang (Massachusetts Institute of Technology (MIT)
Generating functions for scattering amplitudes in N=4 SYM and N=8 supergravity Link to pdf file of related slides

15.00 - 15.30

Coffee, tea and biscuits in Seminar Room D/E

15.30 - 16.00

Asad Naqvi (Swansea University)
Random field theory Link to pdf file of related slides

16.00 - 16.30

Horatiu Nastase (Global Edge Institute, Tokyo Institute of Technology)
A black hole solution of scalar field theory and the RHIC fireball Link to pdf file of related slides

16.30 - 17.00

Mukund Rangamani (Durham University)
Non-linear hydrodynamics from gravity Link to pdf file of related slides

 

Thursday 19 June

10.00 - 11.00

Leonard Susskind (Stanford University)
TBA Link to pdf file of related slides

11.00 - 11.30

Coffee, tea and biscuits in Seminar Room D/E

11.30 - 12.00

Thomas Levi (New York University)
When worlds collide Link to pdf file of related slides

12.00 - 12.30

Harvey Reall (University of Cambridge)
Extremal black holes
Link to pdf file of related slides

12.30 - 14.30

Lunch break

14.30 - 15.30

Samir Mathur (Ohio State University)
How information comes out of a black hole Link to pdf file of related slides

15.30 - 16.00

Coffee, tea and biscuits in Seminar Room D/E

16.00 - 16.30

Marika Taylor (Institute for Theoretical Physics, Amsterdam)
Precision holography Link to pdf file of related slides

16.30 - 17.00

Donald Marolf (University of California, Santa Barbara)
Gauss' law, observables, and black hole information Link to pdf file of related slides

19.00

Workshop dinner at Blonde Restaurant, 75 St Leonard's Street

 

Friday 20 June

10.00 - 11.00

Kostas Skenderis (Institute for Theoretical Physics, Amsterdam)
Real-time gauge/gravity duality Link to pdf file of related slides

11.00 - 11.30

Coffee, tea and biscuits in Seminar Room D/E

11.30 - 12.00

Veronika Hubeny (Durham University)
Universality for merging ergosurfaces Link to pdf file of related slides

12.00 - 12.30

Ted Jacobson (University of Maryland)
Thermodynamics of spacetime Link to pdf file of related slides

12.30 - 14.30

Lunch break and close of workshop

Presentations

Cardoso, Gabriel
On non-holomorphic corrections to black hole partition functions
View Abstract
We discuss an approach for incorporating non-holomorphic corrections into N=2 black hole partition functions.
Chu, Chong-Sun
Time-dependent AdS/CFT duality and null singularity
View Abstract
I will discuss a proposal of understanding a class of spacetime with null singularities in IIB string theory using the ADS/CFT correspondence. The IIB background typically has a varying dilaton and axion field, and these are mapped to time-dependent gauge coupling and theta angle in the gauge theory. The construction of the full dual supersymmetric gauge theory will be explained. The supergravity metric can be reproduced from a one loop computation of the SYM. We conjecture that higher loop quantum corrections provide a resolution of the spacetime singularity.
Craps, Ben
Quantum propagation across cosmological singularities
View Abstract
The AdS/CFT correspondence relates a gravitational bulk theory in which smooth initial data can develop a big crunch singularity to a non-gravitational boundary theory with a potential unbounded below. The big crunch singularity in the bulk corresponds to a boundary operator reaching infinity in finite time. We use self-adjoint extensions, which can be thought of as reflecting boundary conditions at infinity in field space, to define time evolution across the singularity and discuss whether particle creation in the boundary theory can prevent a bounce.
Das, Sumit
Gauge gravity duality and cosmological singularities
View Abstract
We construct toy models of cosmology in five dimensional asymptotically AdS
spacetimes and their gauge theory duals. For certain null singularities we argue
that the gauge theory is well defined and provides a possible resolution of
the singularity. For spacelike singularities we aim to understand the question : which kind of singularity can be possibly resolved in this fashion. The work is based on past and ongoing research with Adel Awad, K. Narayan and Sandip Trivedi.
David, Justin
On the partition function of dyons in N=2 string theories
View Abstract
We study the entropy function of two N =2 string compactifications obtained as freely acting orbifolds of N=4 theories : the STU model and the FHSV model. The Gauss-Bonnet term for these compactifications is known precisely. We apply the entropy function formalism including the contribution of this four derivative term and evaluate the entropy of dyons to the first subleading order in charges for these models. We then propose a partition function involving the product of three Siegel modular forms of weight zero which reproduces the degeneracy of dyonic black holes in the STU model to the first subleading order in charges. The proposal is invariant under all the duality symmetries of the STU model. For the FHSV model we write down an approximate partition function involving a Siegel modular form of weight four which captures the entropy of dyons in the FHSV model in the limit when electric charges are much larger than magnetic charges.
de Boer, Jan
Quantization of gravitational solutions
View Abstract
The construction of multi-centered supersymmetric black hole solutions in four and five dimensions will be reviewed, and the quantization of the space of solutions will be described, which will then be applied to the wall-crossing formula and the fuzzball proposal for black holes.
Elvang, Henriette
Generating functions for scattering amplitudes in N=4 SYM and N=8 supergravity
View Abstract
Tree amplitudes in N=8 supergravity are related to sums of squares of tree amplitudes in N=4 super Yang-Mills theory. We study this relationship using generating functions from which amplitudes are calculated by simple application of unique derivative operators corresponding to the external states. Recursion relations play a central role: we will discuss their validity which is linked to certain UV limits of the tree amplitudes. This study is motivated by recent work on the possible perturbative finiteness of N=8 supergravity.
Emparan, Roberto
New phases of black holes in higher dimensions
View Abstract
I will review the recent progress in uncovering novel kinds of black holes in higher dimensions. These include black rings, pinched black holes, and new types of blackfolds.
Gauntlett, Jerome
AdS solutions and transgression
View Abstract
To follow
Hubeny, Veronika
Universality for merging ergosurfaces
View Abstract
One of the key properties of a rotating black hole is its ergoregion, bounded by the `stationary limit surface' or `ergosurface', beyond which static observers cannot exist. For multi-center black hole configurations with multiple horizons, the respective ergosurfaces can be disjoint or connected, depending on the parameters of the configuration; in other words, ergosurfaces can merge. We will focus on this merging transition for ergosurfaces, and observe that the merger is described by a certain specific universal angle which depends only on the spacetime dimension. I will motivate this universality and discuss its implications.
Jacobson, Ted
Thermodynamics of spacetime
View Abstract
TBA
Jejjala, Vishnu
Entropy of near-extremal black holes in AdS_5
View Abstract
We construct the microstates of near-extremal black holes in AdS_5times S^5 as gases of defects distributed in heavy BPS operators in the dual SU(N) Yang-Mills theory. These defects describe open strings on spherical D3-branes in the S^5, and we show that they dominate the entropy by directly enumerating them and comparing the results with a partition sum calculation. We display new decoupling limits in which the field theory of the lightest open strings on the D-branes becomes dual to a near-horizon region of the black hole geometry. In the single-charge black hole we find evidence for an infrared duality between SU(N) Yang-Mills theories that exchanges the rank of the gauge group with an R-charge. In the two-charge case (where pairs of branes intersect on a line), the decoupled geometry includes an AdS_3 factor with a two-dimensional CFT dual. The degeneracy in this CFT accounts for the black hole entropy. In the three-charge case (where triples of branes intersect at a point), the decoupled geometry contains an AdS_2 factor. Below a certain critical mass, the two-charge system displays solutions with naked timelike singularities even though they do not violate a BPS bound. We suggest a string theoretic resolution of these singularities.
Kraus, Per
Stringy Black Holes in 5D
View Abstract
I will review work on understanding black hole solutions, their entropy, and the resolution of naked singularities, within the framework of 5D gravity with
quantum/string corrections. This allows for a unified treatment of black holes/strings/rings. It also sheds light on when and why we get agreement between microscopic and gravitational entropy computations.
Larsen, Finn
Black holes in four dimensions: the non-BPS branch
View Abstract
We construct all extremal black holes in four dimensions and discuss their microscopic description. The emphasis is on the physical differences between BPS and non-BPS black holes.
Levi, Thomas
When worlds collide
View Abstract
I will discuss some cosmological implications of the string theory landscape, focusing on Coleman-de Luccia bubbles and scenarios in which two such bubbles collide. I will analyze the dynamics of these collisions in the thin wall limit and discuss potentially observable signals in the CMB, large scale structure ,and other experiments.
Mariño, Marcos
Topological strings, black holes and emergent spacetime
View Abstract
In this talk I will review two contributions of topological string theory to the understanding of quantum gravity: the entropy of 5d black holes, and the emergent nature of spacetime from gauge theory degrees of freedom.
Marolf, Donald
Gauss' law, observables, and black hole information
View Abstract
I will argue that unitarity in black hole evaporation is a natural consequence of general relativity and quantum mechanics without the need for new non-localities. This issue is closely tied to the construction of observables, which will also be addressed.
Mathur, Samir
How information comes out of a black hole
View Abstract
In recent years there has been increasing evidence that the internal state of a black holes is a horizon sized quantum `fuzzball'. While most early work concerned extremal holes, we now have simple cases of non-extremal microstates. These microstates are unstable, and the radiation emitted due to this instability is found to exactly agree with the Hawking radiation expected from the microstates. Information is not lost as the radiation does not emerge from pair creation at a horizon, and we can see the properties of the microstate in the spectrum of the radiation.
Minic, Djordje
On the origin of the universe and the dark energy
View Abstract
I will present a new approach to the resolution of the Big Bang singularity. In particular, within this new viewpoint I will discuss the puzzle of the low entropy of the initial state, as well as its relationship to the cosmological constant problem.
Naqvi, Asad
Random field theory
View Abstract
To follow
Nastase, Horatiu
A black hole solution of scalar field theory and the RHIC fireball
View Abstract
A scalar field theory solution is presented that has the properties of a black hole: thermal horizon and (scalar field) information loss. There is a unique scalar action admitting such a solution: the DBI action plus a particular source term. It represents a toy model for the RHIC fireball, that can be traced all the way back to Heisenberg's 1952 model.
Pioline, Boris
Instanton corrections and black hole partition functions
View Abstract
Black holes in 4D yield instantons in 3D. We study instanton corrections to hypermultiplet moduli spaces in type II string theories compactified on CY x S_1, using twistor techniques. The implications for black hole partition functions in N=2, D=4 theories will be discussed.
Rangamani, Mukund
Non-linear hydrodynamics from gravity (provisional title)
View Abstract
I will discuss an approach to non-linear hydrodynamics using the AdS/CFT correspondence. In particular, I will describe how to construct the stress tensor dual to a conformal fluid with a holographic dual geometry.
Reall, Harvey
Extremal black holes
View Abstract
Extremal black holes play an important role in string theory. An extremal black hole has a well-defined near-horizon geometry. I shall review attempts to classify near-horizon geometries and the implications of such classifications for black hole uniqueness and the attractor mechanism.
Skenderis, Kostas
Real-time gauge/gravity duality
View Abstract
We present a general prescription for the holographic computation of real-time n-point functions in non-trivial states.
Taylor, Marika
Precision holography
View Abstract
We develop precision holography for non-conformal branes, emphasising the role of the underlying generalized conformals structure. We then discuss applications to holographic models for QCD, such as the Sakai-Sugimoto model.

Participants

Name
Institution
Gabriel, CardosoUniversity of Munich
Chong-Sun, ChuDurham University
Ben, CrapsVrije Universiteit Brussel
Sumit, DasUniversity of Kentucky
Justin, DavidIndian Institute of Science, Bangalore & Harish-Chandra Research Institute, Allahabad
Jan, de BoerInstitute for Theoretical Physics, Amsterdam
Paul, de MedeirosUniversity of Edinburgh
Bernard, de WitUtrecht University
Henriette, ElvangMassachusetts Institute of Technology (MIT)
Roberto, EmparanICREA & Universitat de Barcelona
José, Figueroa-O'FarrillUniversity of Edinburgh
Bartomeu, FiolUniversity of Barcelona
Dan, FreedmanMassachusetts Institute of Technology (MIT)
Jerome, GauntlettImperial College London
Kevin, GoldsteinUniversiteit Utrecht
Emily, Hackett-JonesUniversity of Edinburgh
Veronika, HubenyDurham University
Chris, HullImperial College London
Ted, JacobsonUniversity of Maryland
Vishnu, JejjalaUniversity of the Witswatersrand
Stefanos, KatmadasUniversiteit Utrecht
Per, KrausUniversity of California, Los Angeles (UCLA)
Finn, LarsenUniversity of Michigan and CERN
Thomas, LeviNew York University
Marcos, MariñoUniversity of Geneva
Donald, MarolfUniversity of California, Santa Barbara
Samir, MathurOhio State University
Robert, McNeesPerimeter Institute, Canada
Elena, Mendez-EscobarUniversity of Edinburgh
Djordje, MinicVirginia Polytechnic Institute and State University
Thomas, MohauptUniversity of Liverpool
Asad, NaqviSwansea University
Horatiu, NastaseGlobal Edge Institute, Tokyo Institute of Technology
Boris, PiolineLPTHE & LPTENS, Paris
Mukund, RangamaniDurham University
Harvey, ReallUniversity of Cambridge
Patricia, RitterUniversity of Edinburgh
Simon, RossDurham University
Masaki, ShigemoriInstitute for Theoretical Physics, Amsterdam
Joan, SimónUniversity of Edinburgh
Kostas, SkenderisInstitute for Theoretical Physics, Amsterdam
Leonard, SusskindStanford University
Marika, TaylorInstitute for Theoretical Physics, Amsterdam