The notion of observer, which is quite a nuanced concept in quantum mechanics and in GR taken separately, can be expected to take a new meaning at the crossroads of those two theories, whatever the correct quantum theory of gravity will be.

We will gather a handful of experts in Quantum Foundations, Quantum Information Theory, Quantum Gravity and Philosophy of Physics, to discuss different aspects of the notion of observer, with an open mind regarding the particular framework or approach that each of us is pursuing, and trying to keep a focus on the conceptual and cross-disciplinary aspects.

# Tag Archives: quantum gravity

# International Conference on Quantum Gravity, Shenzhen, China

This conference is mostly about quantum gravity and its intrinsic nonlocal feature, but also about general gravitational theories beyond Eisntein’s gravity, black holes, cosmology, and observational tests.

It is well known that any fundamental theory is nonlocal at the quantum level, namely the quantum effective action is a “very nonlocalâ€ť functional. Moreover, quantum mechanics itself is intrinsically nonlocal. Furthermore, when we try to construct a consistent theory for quantum gravity non locality turns out to be unavoidable. Indeed, in our days we have several consistent proposals for quantum gravity: String Theory, Loop Quantum Gravity, Nonlocal Quantum Gravity, Asymptotically Safe Quantum Gravity, etc., and all of them are nonlocal. In this conference we will try to make the point of the current understanding of several approaches to quantum gravity with particular attention to the locality paradigm at short distance. In particular we will try to point out issues and ways to overcome them.

However, besides the fundamental theoretical problems, other topics of the conference are about the spacetime singularitys’ issue, black holes at the classical and quantum level, the information loss problem, and the cosmological implications at short and large distance of a large class of local and nonlocal gravitational theories.

The key-topics of the conference are:

– Nonlocal Quantum Gravity

– Super-renormalizable Quantum Gravity Theories

– String Theory

– Loop Quantum Gravity

– Theories Beyond Einstein Gravity

– Spacetime Singularities

– Classical and Quantum Black Holes

– Cosmology

– Gravitational Waves

– Observational Tests

Invited Speakers:

Rong-Gen Cai (Institute of Theoretical Physics/CAS, China)*

Xavier Calmet (Sussex University, UK)*

John Donoghue (Massachusetts Amherst, US)*

Yungui Gong (Huazhong University of Science and Technology, China)

Alexy Koshelev (Universidade da Beira Interior, Portugal)

Yongge Ma (Beijing Normal University, China)

Anupam Mazumdar (University of Groningen)

Yun-Soo Myung (Inje University, South Korea)

Ilya Shapiro (Juiz de Fora University, Brazil)

Terry Tomboulis (University of California Los Angeles, US)

Richard Woodard (University of Florida Gainesville, US)

Nico Yunes (Montana State University, US)

… and others

* To be confirmed

Scientific Organizing Committee:

Cosimo Bambi (Fudan University, China; Chair)

Rong-Gen Cai (Institute of Theoretical Physics/CAS, China)

Gianluca Calcagni (IEM-CSIC Madrid, Spain)

Valeri Frolov (University of Alberta, Canada)

Miao Li (Sun Yat-sen University, China)

Yongge Ma (Beijing Normal University, China)

Anzhong Wang (Zhejiang University of Technology, China)

Haitang Yang (Sichuan University, China)

Shuang-Nan Zhang (Institute of High Energy Physics/CAS, China)

Local Organizing Committee:

Cosimo Bambi (Fudan University, China)

Gianluca Calcagni (IEM-CSIC Madrid, Spain)

Leonardo Modesto (SUSTech, China; Chair)

Guanhao Xie (SUSTech, China)

# School “Making Quantum Gravity Computable”, Waterloo, Canada

A small number of vacancies is still available at this summer’s school on numerical methods in quantum gravity, aimed primarily at PhD students and postdocs in the field. If you are interested, please register as soon as possible via the school’s website.

# Special Issue on “Phenomenological Aspects of Quantum Gravity and Modified Theories of Gravity”

Dear Colleagues,

A Special Issue on “Phenomenological Aspects of Quantum Gravity and Modified Theories of Gravity” will be published in the Journal “Advances in High Energy Physics” in September 2016.

You can find the Call for Papers for this Special Issue at

http://www.hindawi.com/journals/AHEP/si/212894/cfp/

Submission deadline is 6 May 2016.

Cordially Yours,

Lead Guest Editor: Ahmed Farag Ali (Benha University, Egypt)

Guest Editors: Giulia Gubitosi (Imperial College London, London, UK), Mir Faizal (Waterloo University, Waterloo, Canada), Barun Majumder (Montana State University, Bozeman, USA)

# New Book: Covariant Loop Quantum Gravity: An Elementary Introduction to Quantum Gravity and Spinfoam Theory (Cambridge Monographs on Mathematical Physics) by C. Rovelli and F. Vidotto

This book provides readers with a simple introduction to loop quantum gravity, centred on its covariant approach. It focuses on the physical and conceptual aspects of the problem and includes the background material needed to enter this lively domain of research, making it ideal for researchers and graduate students. Topics covered include quanta of space; classical and quantum physics without time; tetrad formalism; Holst action; lattice QCD; Regge calculus; ADM and Ashtekar variables; Ponzano-Regge and Turaev-Viro amplitudes; kinematics and dynamics of 4D Lorentzian quantum gravity; spectrum of area and volume; coherent states; classical limit; matter couplings; graviton propagator; spinfoam cosmology and black hole thermodynamics.

# 2nd BNU International Summer School on Quantum Gravity, Beijing (China)

The Beijing Normal University (BNU) International Summer School on Quantum Gravity is intended to provide a pedagogical introduction for graduate students and young post-docs to the main fields closely related to loop quantum gravity.

Topics include: Loop quantum gravity, Loop quantum cosmology, Spin foams, Group field theory, Regge calculus

Lecturers:

– Abhay Ashtekar (Penn State Univ, USA)

– Benjamin Bahr (Cambridge Univ, UK)

– John Barrett (Univ of Nottingham, UK)

– Jonathan Engle (Florida Atlantic Univ, USA)

– Thomas Krajewski (Univ of Provence and CPT Marseille, France)

– Jerzy Lewandowski (Univ of Warsaw, Poland)

– Etera Livine (ENS de Lyon, France)

The working language is English. But participation is limited. Students and young post-docs who are interested to attend the school are invited to look up the registration information and register at the website:

http://physics.bnu.edu.cn/summerschool/

The deadline for online application is May 31, 2012.

Organization Committee:

ASHTEKAR Abhay (Penn State)

BANERJEE Kinjal (BNU)

DING You (BJTU)

GAO Sijie (BNU)

HUANG Chaoguang (IHEP, CAS)

LEWANDOWSKI Jerzy (Warsaw)

LIU Wenbiao (BNU)

LU Hong (BNU)

MA Yongge (BNU)

ZHOU Bin (BNU)

Secretaries:

GUO Haibiao (BNU)

HAN Yu (BNU)

WANG Jingbo (BNU)

ZHOU Zhenhua (BNU)

Contact: QGschool[AT]bnu.edu.cn

Yongge Ma

On behalf of the Organization Committee

Dept of Physics

Beijing Normal University

Beijing 100875, CHINA

Tel: +86-10-58809499

Fax: +86-10-62209742

Webpage: http://physics.bnu.edu.cn/application/research/gravity/LQG/eng/research.html

Travel support for U.S. Students and Post-docs to attend the 2nd BNU School on Quantum Gravity

The 2nd Beijing Normal University School on quantum gravity will take place from August 13th to August 18th, 2012. Although the hosts of the school will be able to partially cover local costs of attendees, they will not be able to cover all costs. Because of this, we have applied for, and will likely receive, NSF funds to provide partial travel support to a number of U.S. students and beginning post-docs to attend this school. We expect to be able to cover at least half the plane fare of the selected applicants.

Interested young researchers should send a CV, list of publications and, if a student, a recommendation letter from your advisor, to jonathan.engle[AT]fau.edu, no later than Friday, May 18th, 2012. In the email, please also indicate whether you have access to other funding sources, and, if so, which ones. The final selection will be made by a committee consisting of scientists from three different universities.

The organizers of the BNU school have graciously agreed to accept the selected participants. Nevertheless, it is still necessary for students to register and request partial support for local costs directly at the main school website http://physics.bnu.edu.cn/summerschool, in addition to applying for this NSF support.

# Quantum Gravity: the first 25 years. Read the focus section published in Classical and Quantum Gravity.

We invite you to read-for-free the CQG focus section reviewing 25 years of quantum gravity research.

http://iopscience.iop.org/0264-9381/28/15

This issue features 2 invited review articles from physicists who have been associated with String Theory and Loop Quantum Gravity from their inception. They were invited to write a retrospective review: What were the initial hopes? To what extent have these hopes been realised? What were the major successes, surprises, disappointments? The emphasis is on what has come OUT of the program rather than technical developments internal to the program. We hope that the reader, whatever her persuasion, will be able to form a panoramic view of quantum gravity research today within these two programmes.

Yours sincerely

Joseph Samuel

Editorial Board Member

Classical and Quantum Gravity