Workshop on Gravitation, Relativity and Cosmology in honor of Prof James Nester's 70th Birthday

S4-208, Center for Mathematics and Theoretical Physics 數學與理論物理中心,
Science-4 (Physics), Chien-Shiung Wu Building 健雄館
Department of Physics, National Central University, ChungLi, Taiwan, ROC

10:00 – 10:40 Hwei-Jang Yo 游輝樟(National Cheng Kung University)
Nonlinear Constraint Effects in Gauge Theories of Gravity

10:40 – 11:00 coffee break

11:00 – 11:40 Chiang-Mei Chen 陳江梅 (National Central University)
Quasi-local Quantities for Gravity Theories
11:40 – 12:20 Yu-Huei Wu 吳育慧 (National Central University)
Quasi-local energy-momentum in Metric Affine Gravity

12:20 – 13:30 Lunch

13:30 – 14:10 Fei-Hung Ho 何飛宏 (National Cheng Kung University)
On Torsion Cosmology

14:10 – 14:30 coffee break

14:30 – 15:10 Ming-Fan Wu 巫明帆 (National Chiao Tung University)
Quasi-local Energy for Spherically Symmetric Spacetimes
15:10 – 15:50 Jian-Liang Liu and Gang Sun 劉建良 孫綱 (National Central U.)
Embedding Approach for Reference

15:50 – 16:10 coffee break

16:10 – 18:00 Time for former students, friends and colleagues

18:00 – 20:00 Banquet and Party —– Chih-Hung Wang 王志宏: Violin

Death of Arthur Komar

Arthur Komar, Ph.D., 80, died Friday evening, June 2, 2011 at Menorah Park. Dr. Komar was the former dean of the Belfer Graduate School of Science at Yeshiva University in New York City; had worked at the National Science Foundation in Washington, DC; and was associated with the physics department at Syracuse University. As a student at Princeton University, he had tea with Albert Einstein. Arthur was a true renaissance man in every sense of the word. Survived by his children, Arne (Kelly) Komar and Tanya Komar; his grandchildren; his partner of 50 years, Dr. Alice Honig; and his former wife Dolly (Arnold Honig) Komar-Honig. Funeral services will be 11 a.m. Tuesday at Sisskind Funeral Chapel. Friends may visit with the family immediately prior to the service on Tuesday, from 10 to 11 a.m. at the funeral chapel, 3175 E. Genesee Street. Burial will be in the Congregation Beth Sholom-Chevra Shas section of Oakwood Cemetery. Sisskind Funeral Service LLC 3175 E. Genesee St. 446-4848

Published in Syracuse Post Standard on June 5, 2011

Read the New CQG Highlights of 2010-2011 for free

Dear Colleagues,

It is my pleasure to announce the publication of Classical and Quantum Gravity’s Highlights of 2010-2011. These articles were selected by the Editorial Board of Classical and Quantum Gravity (CQG) and represent some of the most interesting recent work in gravitational physics.

http://bit.ly/raNBFt

Articles featured in past CQG Highlights have been highly cited and are frequently downloaded. All selected articles will be free to download until the end of 2012.

The list includes fast-track communications, research papers, review articles and special issue contributions published between May 2010 and June 2011.

Be sure to pick up a copy of the latest CQG Highlights Brochure which will be available at gravitational physics meetings throughout 2012. The brochure contains summaries of all the highlighted articles as well as details of the journal’s ongoing activities including prize sponsorships and forthcoming special issues.

I invite you to submit your work to CQG and hope to see it promoted as a CQG Highlight in the future.

With best wishes

Ben Sheard
Publishing Editor
Classical and Quantum Gravity

Excellent research published online: Newtonian Gravity and the Bargmann Algebra

Dear Colleagues,

It gives me great pleasure to notify you of the publication of the above article in Classical and Quantum Gravity.

TITLE: Newtonian Gravity and the Bargmann Algebra
AUTHORS: Roel Andringa, Eric Bergshoeff, Sudhakar Panda and Mees de Roo

This article received very positive comments and a high quality rating from its referees. The article is available to download from IOPscience.

Please find below a summary by the authors of the developments made in this article:

‘Newton–Cartan gravity is a geometric formulation of Newtonian gravity, based on the nonrelativistic limit of general relativity. In our paper we confront this traditional view of Newton–Cartan gravity with a different approach that starts from the Bargmann algebra, a centrally extended version of the Galilei algebra. This approach emphasizes the analogy with the formulation of general relativity as a gauge theory of the Poincaré algebra. The algebraic method suggests a number of generalizations, for instance to conformal algebras, and to the Newton–Hooke algebra, which would lead to classical gravity induced by nonrelativistic strings.’

Yours sincerely

Rachel Lawless
Publishing Editor
Classical and Quantum Gravity

Drinks reception sponsored by Classical and Quantum Gravity, Glasgow University, 3 April, 6pm

Participants of IOP’s Nuclear and Particle Physics Divisional (NPPD) conference at Glasgow University (4-7 April) are invited to attend an opening drinks reception sponsored by Classical and Quantum Gravity (CQG).

The reception will begin at 6pm on Sunday 3 April in the Hunterian Gallery, opposite the main university building.

I look forward to seeing you there!

Adam Day
Publisher

High quality article in Classical and Quantum Gravity

Dear Colleagues,

TITLE: Lost in translation: topological singularities in group field theory
AUTHORS: Razvan Gurau

It gives me great pleasure to notify you of the publication of the above article in Classical and Quantum Gravity. This article received very positive comments and a high quality rating from its referees. The article is available to download here: http://herald.iop.org/link/4107

Please find a summary of the developments made in this article below:

Random matrix models generalize in higher dimensions to Group Field Theories (GFTs) whose Feynman graphs are dual to gluings of simplices. In this paper we prove that the effective behavior of generic GFTs is dominated by singular graphs, not dual to normal simplicial pseudo manifolds. This very serious problem brings into question their viability as quantum field theories. We prove however that, fortunately, the recently introduced “colored” GFT models circumvent this problem, generating only graphs dual to pseudo manifolds. We conclude that they are the correct starting point for the study of GFTs as quantum field theories.

Yours sincerely

Adam Day
Publisher
Classical and Quantum Gravity

Excellent research published online: Combining gravity with the forces of the standard model on a cosmological scale

Dear Colleagues,

TITLE: Combining gravity with the forces of the standard model on a cosmological scale
AUTHORS: Claus Gerhardt

It gives me great pleasure to notify you of the publication of the above article in Classical and Quantum Gravity.

This article received very positive comments and a high quality rating from its referees. The article is available to download here:

http://herald.iop.org/branding/m19/rzl/$CONTACT_ID/link/3780

Please find a summary of the developments made in this article written by the authors below:

We prove the existence of a spectral resolution of the Wheeler-DeWitt equation when the underlying spacetime is a Friedman universe with flat spatial slices and where the matter fields are comprised of the strong interaction, with SU(3) replaced by a general SU(n), n >= 2, and the electro-weak interaction.

The wave functions are maps from R[4n+10] to a subspace of the antisymmetric Fock space, and one noteworthy result is that, whenever the electro-weak interaction is involved, the image of an eigenfunction is in general not one dimensional, i.e., in general it makes no sense specifying a fermion and looking for an eigenfunction the range of which is contained in the one dimensional vector space spanned by the fermion

Yours sincerely

Adam Day
Publisher
Classical and Quantum Gravity

Excellent research published online: Accurate light-time correction due to a gravitating mass

Dear Colleagues,

TITLE: Accurate light-time correction due to a gravitating mass
AUTHORS: Neil Ashby, Bruno Bertotti

It gives me great pleasure to notify you of the publication of the above article in Classical and Quantum Gravity.

This article received very positive comments and a high quality rating from its referees. Please find a summary of the developments made in this article below:

The time delay and deflection of light passing between two points near a spherical mass of gravitational radius m, are expressed to second order in m in terms of endpoint positions and angle subtended at the source by the endpoints, instead of unknown quantities such as the closest approach distance b. We minimize Fermat’s action functional and solve the eikonal equation for a null geodesic. In a close superior conjunction the second-order correction contains an enhanced part of order m2R/b2, where R is of the order of the endpoint distances from the sun. We compare these results to previous calculations, in particular with the second-order terms introduced in NASA’s Orbit Determination Program. We use asymptotic series to determine which higher-order terms are important.

The results are significant for understanding the results of the Cassini light-time experiment, and for future missions whose purpose may include measuring the PPN parameter gamma.

Yours sincerely

Adam Day
Publisher
Classical and Quantum Gravity

New focus section on cosmological perturbations in Classical and Quantum Gravity

It is with great pleasure that we announce the publication of the following focus section in Classical and Quantum Gravity (CQG):

Focus section on non-linear and non-Gaussian cosmological perturbations, dedicated to the memory of Lev Kofman
Guest editors: Misao Sasaki and David Wands
http://iopscience.iop.org/0264-9381/27/12

In recent years there has been a resurgence of interest in the study of non-linear perturbations of cosmological models. This focus section will be of interest to theoretical physicists and astrophysicists alike interested in understanding and interpreting recent developments in cosmological perturbation theory and models of the early universe. The section is dedicated to the memory of Lev Kofman (1957–2009), an enthusiastic pioneer of inflationary cosmology and non-Gaussian perturbations.

This is CQG’s first ever focus section.  A focus section is a collection of specially invited papers on a subject of current interest.  Unlike other special issues, it is not based on a conference.  We are sure you will agree with the referees of the issue who reported that the contributions are timely and of a very high quality.

We take this opportunity to thank all of the authors, referees and particularly the guest editors who gave their time and expertise to create this excellent issue.

The focus section will be free to read for 6 months from date of publication.  We invite you to read the articles on the new IOPscience service!
http://iopscience.iop.org/0264-9381/27/12

Yours sincerely,

Adam Day
Publisher
Classical and Quantum Gravity
iopscience.org/cqg

Excellent research published online: Reduced Hamiltonian for next-to-leading order Spin-Squared Dynamics of General Compact Binaries

Dear Colleagues,

TITLE: Reduced Hamiltonian for next-to-leading order Spin-Squared Dynamics of General Compact Binaries
AUTHORS: Steven Hergt, Jan Steinhoff and Gerhard Schaefer

It gives me great pleasure to notify you of the publication of the above article in Classical and Quantum Gravity.

This article received very positive comments and a high quality rating from its referees.

Please find a summary of the developments made in this article below:

Fully reduced Hamiltonians belong to the most compact and elegant dynamical devices in physics. This particularly applies to spinning compact binaries in general relativity where approximate Hamiltonians are now available including spin-orbit, spin(1)spin(2), and spin-squared terms, all through next-to-leading order (NLO) in relativistic coupling counted in powers of the inverse of speed-of-light squared, called post-Newtonian expansion. The most complicated terms are the spin-squared ones which include information about the rotational deformation of black holes and, depending on a specific model, of neutron stars. For both a fully reduced NLO spin-squared Hamiltonian is derived and compared with former results from the Effective Field Theory approach where a nonreduced effective potential was obtained which is cast into Hamilton form under variable transformation applicable to all NLO spin terms. The result should have impact on the description of inspiralling binaries in gravitational wave astronomy.

Yours sincerely

Adam Day
Publisher
Classical and Quantum Gravity

Iopscience.org/cqg

NRDA09/MICRA09 Double special issue published in Classical and Quantum Gravity

I am delighted to announce the publication of the following double special issue in Classical and Quantum Gravity:

Invited papers from Numerical Relativity and Data Analysis (NRDA) 2009,
Albert Einstein Institute, Potsdam, 6 – 9 July, 2009
Guest Editors: S Husa and B Krishnan

Invited papers from Microphysics In Computational Relativistic Astrophysics (MICRA) 2009,
Niels Bohr International Academy, Copenhagen, 24 – 28 August 2009
Guest Editors: C D Ott, C Pethick and L Rezzolla

The NRDA meeting was aimed at fostering closer interactions between simulations of gravitational wave sources and the ongoing searches for gravitational wave signals.

The MICRA meeting brought together researchers in numerical modeling and physics of matter at high densities, where general relativity plays a central role.

I take this opportunity to thank all of the authors, referees and guest editors who gave their time and expertise to create this excellent issue.

The special issue will be free for 6 months from date of publication. I invite you to read the articles on the new IOPscience service!

Yours sincerely,

Adam Day
Publisher
Classical and Quantum Gravity
iopscience.org/cqg

NINJA-2 project

The Numerical INJection Analysis project (NINJA) is a collaboration between researchers in numerical relativity and gravitational wave data-analysis. The basic idea is to embed numerically computed gravitational waveforms into noise representative of the LIGO and VIRGO detectors. The resulting data-sets are then analysed to gain insight into the properties of gravitational wave data-analysis pipelines. The first NINJA project was a great success with the final paper being published in August.

A more ambitious follow-on project, NINJA-2, is just getting underway, and everybody interested in the project is welcome to join. The kick-off telecon for this project took place on October 15, 2009. NINJA-2 aims to examine non-precessing binary black holes in realistic detector noise: Long gravitational waveforms (obtained by combining an analytical post-Newtonian inspiral waveform with a fully numerical merger simulation) are injected into realistic LIGO/Virgo detector noise; the resulting data-sets are then analysed to gain insight into properties and efficiencies of data-analysis pipelines.

The minutes of this telecon, as well as further information about NINJA-2 are posted on the NINJA-webpage http://www.ninja-project.org. Follow-on discussions of the telecon are handled via the mailing list ninja@aei.mpg.de. Please subscribe to this list at

http://lists.aei.mpg.de/cgi-bin/mailman/listinfo/ninja