Sixth International Conference on the Nature and Ontology of Spacetime, Albena, Bulgaria

The Scientific Organizing Committee invites papers from physicists, philosophers of physics and philosophers on any topic related to the nature of spacetime.

As there will be no main theme of the sixth spacetime conference the Committee also invites proposals for special session topics. The topics proposed so far are listed at

Depending on the number of colleagues participating in a special session, we plan to publish a volume with the talks presented at the session, which will include constructive criticism and the replies of the authors.

Contributed papers in the form of extended abstracts of between one and two pages should be emailed to 2020conference[AT] by January 31, 2020. Submissions will be reviewed and notification of acceptance will be sent by February 17, 2020.

Scientific Organizing Committee:

Dennis Dieks (Utrecht University)
Mauro Dorato (University of Rome Three)
George F. R. Ellis (University of Cape Town)
Robert Geroch (University of Chicago)
Eleanor Knox (King’s College London)
Vesselin Petkov (Minkowski Institute, Montreal)
Steven Savitt (University of British Columbia)
Anguel Stefanov (Bulgarian Academy of Sciences)
James Owen Weatherall (University of California, Irvine)
Christian Wuethrich (University of Geneva)

Local Organizing Committee:

Temenuzhka Ivanova (Albena Congress Center)
Milen Milev (Hotel Laguna Garden)
Anguel Stefanov (Bulgarian Academy of Sciences)
Svetla Petkova (Minkowski Institute Press, Montreal)
Vesselin Petkov (Minkowski Institute, Montreal)

Probing Effective Theories of Gravity in Strong Fields and Cosmology, Santa Barbara, USA

Probing Effective Theories of Gravity in Strong Fields and Cosmology
KITP, UC Santa Barbara

Coordinators: Cora Dvorkin, Ira Rothstein, and Thomas Sotiriou
Scientific Advisors: Alessandra Buonanno, Pedro Ferreira, and Steve Giddings

There is strong evidence that General Relativity (GR) is only an effective field theory (EFT). While it is often assumed that the energy scale where the EFT breaks down is near the Planck scale and experimentally inaccessible, tantalizing arguments suggest that GR is not a canonical effective theory.

In particular, the apparent hints of non-locality in black hole evaporation and the small scale associated with the vacuum energy motivate reconsidering EFT ideas in gravity. Given the wealth of data in current and future high precision cosmological surveys, it is necessary to develop a tool kit of theoretically consistent EFTs for analyzing potential deviations from the predictions of GR. The birth of gravitational wave astronomy opens up other avenues for testing gravity in previously unimaginable ways, enabling the study of higher curvature backgrounds as well as black hole horizon physics.

This program is geared towards finding ways to push the boundaries of our knowledge of the EFT of GR by bringing together members of three distinct communities: strong gravity/relativistic astrophysics, cosmology, and EFT.

Primary Application Deadline: August 11th 2019. After that date application will continue to be considered in a rolling basis until the program is filled.

Please apply through the KITP website (link).

Summer school on Einstein Equations: Physical and Mathematical Aspects of General Relativity, Domodossola, Italy

The aim of the school is to provide a common ground to PhD students and young researchers in physics and mathematics to meet and learn different viewpoints on various aspects of Einstein equations.

Lectures will be given by

Lars Andersson – Albert Einstein Institute (Max-Planck Institute for Gravitational Physics), Potsdam, Germany

Donato Bini – La Sapienza University (Rome) and C.N.R.

Marco Giammarchi – Istituto Nazionale di Fisica Nucleare (I.N.F.N.) – Sezione di Milano

Pengzi Miao – University of Miami, Miami, Florida

Alexei Starobinski – Landau Institute for Theoretical Physics, Moscow, Russia & Russian Academy of Sciences.

Summer School “The Black Hole Information Loss Paradox”, Bremen, Germany

The aim of this school is to provide an in-depth overview about recent developments in the field. Starting with a precise formulation of the problem in the first half of the school, we will discuss various solution proposals, with a particular focus on the relation to the BMS-group.

Targeting mainly PhD-students, the material will be covered in form of lectures and discussion sessions.

Related contributions by attendees are also welcome.

Inhomogeneous Cosmologies III, Krakow, Poland

Inhomogeneous Cosmologies meetings are small workshops of about 40 participants which gather experts in inhomogeneous cosmology. This year the workshop will take place during 16-21 September 2018 at the Jagiellonian University in Krakow, Poland.

Topics will include:
* exact cosmological solutions of the Einstein equations
* averaging and backreaction in cosmology
* numerical cosmological relativity
* observational tests

We will also have practical hands-on tutorials of the Einstein Toolkit and other free-licensed inhomogeneous cosmology software packages. The workshop sessions will start on the morning of Monday the 17th of September and continue to late afternoon Friday the 21st of September.

Due to the limited number of places available, registration by the early registration deadline of 15th June 2018, including a draft abstract, is strongly recommended. If places remain available, late registration will remain open until the late registration deadline of 24th August 2018 — see for details.

Contact: cosmology[at]

Scientific Organizing Committee
Eloisa Bentivegna, Thomas Buchert, Mikolaj Korzynski, Hayley Macpherson, Jan Ostrowski, Boud Roukema, Sebastian Szybka, David Wiltshire

Local Organizing Committee
Krzysztof Glod, Szymon Sikora, Sebastian Szybka

New book: General Relativity 1916 – 2016

General Relativity 1916 – 2016 (Minkowski Institute Press, Montreal 2017) – Selected peer-reviewed papers presented at the Fourth International Conference on the Nature and Ontology of Spacetime, dedicated to the 100th anniversary of the publication of General Relativity, 30 May – 2 June 2016, Golden Sands, Varna, Bulgaria :

Special Issue “Progress in Cosmology in the Centenary of the 1917 Einstein paper”

Dear Colleagues,

The first modern cosmological models emerged soon after the discovery of general relativity, putting the study of the Universe as a whole on the firm grounds of an empirically testable, coherent science. In the century since then, cosmology has developed into a precision discipline able to explain the evolution of the Universe in several of its aspects. The goal is under the way, but far than ended. The most stringent open questions remain the nature of dark matter (DM) and of dark energy (DE), and whether General Relativity holds on large cosmological scales.

Of course, many independent observation (anisotropies in CMB, large structure, SNIa data, gravitational lensing, galaxy rotational curves etc.) confirm the necessity of the introduction of these dark components.

However, the existence itself of the most likely DM candidates seem to have been seriously challenged by experiments and or astrophysical observations: e.g. supersymmetric DM and WIMPs by LHC; by LUX, PandaX-II and Xenon100; MACHOs by microlensing. Sterile neutrinos by IceCube and high redshift objects. The properties of the DM in galaxies are presently badly explainable by current theoretical scenarios. At present the nature of DM remains a mystery.

Understanding DE poses an even bigger challenge. Although the cosmological constant may explain the accelerated cosmic expansion, its physical interpretation (as vacuum energy) remains doubtful. Question comes what kind of fields can be responsible for the accelerated cosmic expansion. Several scalar field models of DE induce new type of space-time singularities (e.g. soft singularities). Alternative gravitational theories (e.g. scalar-tensor theories, the emergent gravity model of Verlinde) have been also proposed with the purpose to explain the dark sector.

We invite colleagues to submit papers on the topics:

1: The nature of Dark matter and DE

2: Present/future experiments and observations related to DM, DE and their gravitational effects.

3: Models on DM and DE including the alternative gravitational theories, new fields and their possible interaction with the particles of standard model.

4: Evolution of the Universe, cosmological perturbations, formation of nonlinear structures, first objects.

5: Inflation, initial structure, primordial gravitational waves.

6: Primordial black/white holes, their formation and gravitational waves, their effects on the synthesis of light elements.

7: Anisotropic cosmological models and their perturbations.

8: Exotic singularities, wormholes occurring in cosmological models and in virialized structure.

Dr. Zoltan Keresztes
Prof. Lorenzo Iorio
Prof. Paolo Salucci
Prof. Emmanuel Saridakis
Guest Editors

New Book: “Einstein’s Apple : Homogeneous Einstein Fields” by Engelbert L. Schucking and Eugene J. Surowitz

After 15 years of effort to grow this apple tree, it has finally dropped its first fruit, namely our volume “Einstein’s Apple” which is now available in hardcover and e-book formats from World Scientific via

The work provides an accessible introduction to concepts such as teleparallelism and torsion that are slighted in many courses; historical introduction sections include the early uses of these concepts and Einstein’s own early insights.

Cheers, Eugene Surowitz

New book: “Introduction to General Relativity, Black Holes and Cosmology”, by Y. Choquet-Bruhat

Dear Colleagues in General Relativity

To please the kind staff of Oxford University Press, and myself, I send you as propaganda for my last book “Introduction to General Relativity, Black Holes and Cosmology”, whose details can also be found at this website:

With best wishes to all

Yvonne Choquet-Bruhat