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

Read the Classical and Quantum Gravity Highlights of 2009-2010

Dear Colleagues,

I am delighted to announce the publication of Classical and Quantum Gravity’s Highlights of 2009-2010. The articles in the list, published between May 2009 and June 2010, were selected by the Editorial Board of Classical and Quantum Gravity (CQG) as a representation of the best recent work in gravitational physics.

http://herald.iop.org/link/4077

The list includes research Papers, Fast Track Communications, review articles and special issue contributions. The selected articles have also proven popular with our readers and have been frequently downloaded.

Look out for the CQG Highlights Brochure in 2011, which will be available at gravitational physics meetings. The brochure summarises the highlighted papers and will tell you more about the journal’s ongoing activities including prize sponsorships and forthcoming special issues.

I invite you to submit your work to CQG and look forward to seeing it promoted as a CQG Highlight in the future.

Yours sincerely

Adam Day
Publisher
Classical and Quantum Gravity

Read the 2010 CERN Winter School in Classical & Quantum Gravity

As a researcher with an interest in gravitational physics, we invite you to read the latest Classical & Quantum Gravity special section ‘Lectures from the CERN Winter School on Strings, Supergravity and Gauge Theory, CERN, 25 – 29 January 2010′.

The articles included within the special section are free to read online until 18 April 2011, and can be accessed by visiting http://herald.iop.org/link/4003

Please feel free to pass this message on to friends and colleagues.

Yours sincerely,

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

Read the Classical & Quantum Gravity GWDAW-14 Special Issue

You may be interested in reading the Classical & Quantum Gravity special issue featuring selected articles from the ‘The 14th Gravitational Wave Data Analysis Workshop’ (GWDAW-14), Rome, Italy, 26 – 29 January 2010.

The articles included within the special issue are free to read online until 22 March 2011, and can be accessed by visiting http://herald.iop.org/link/4002

You may also be interested to know that Journal of Physics Conference Series, the open access conference proceedings publication, has publish additional papers from this conference http://herald.iop.org/link/4004

Please feel free to mention this special issue to friends and colleagues.

Yours sincerely,

Adam Day
Publisher, Classical and Quantum Gravity
cqg@iop.org
www.iopscience.org/cqg

———————–
CQG Highlights of 2009

The collection of Classical & Quantum Gravity’s Highlights of 2008–2009 is still free to read until 01 November 2010, and can be accessed through the following link: http://herald.iop.org/link/4001

2010 Gravitational Physics Group Thesis Prize sponsored by Classical and Quantum Gravity

Second call for nominations 2010

Closing date for nominations: 17th December 2010

The 2010 Gravitational Physics Group Thesis Prize, sponsored by Classical and Quantum Gravity (CQG), will be made for excellence in postgraduate research and communication skills in gravitational physics. All members of the IOP Gravitational Physics Group who passed their PhD viva voce exam between 30 September 2008 and 1 October 2009 are entitled to enter the competition. The winner will be awarded £500 and they will be invited to submit a paper to CQG based on the winning thesis which, if accepted, will be made a ‘select article’ in CQG. Furthermore, the winner will be given the opportunity to present their work at one of the UK ‘BritGrav’ meetings.

Anyone (student or otherwise) can nominate a candidate (including the candidate themselves). If you have someone in mind, please send an email to the IOP Gravitational Physics Group secretary (David Burton at d.burton-at-lancaster.ac.uk) containing the candidate’s contact details and the committee will encourage them to enter the competition. The candidate must be a member of the IOP Gravitational Physics Group, and will be asked to provide their IOP membership number.

Please note that the student’s external PhD examiner must be willing to comment on the student’s research, quality of the student’s thesis and the student’s ability to cogently communicate their work (evidenced by their viva performance and/or seminars). Students are advised to consult their external examiner before entering the competition.

For information on how to enter the competition please click ‘Group Prize’ on the IOP Gravitational Physics Group web page http://gp.iop.org/

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

Back Issues of GRG & CQG

I have more or less complete journal runs of

Classical & Quantum Gravity (1984-present)

General Relativity & Gravitation 1972, 1975, 1978-84 & 1993-Jun 2005

Quarterly J. Roy. Astr. Soc. 1971-1996

which I want to get rid of due to my impending retirement and lack of office space. The journals would be free to any institution or deserving individual prepared to collect them from Birmingham (or who is prepared to pay for packing & carriage).

Alan Barnes

Aston University
Birmingham UK
Email: barnesa[AT]aston.ac.uk

2009 CQG Scientific Meeting

This is the first invitation for members of the UK gravitational physics community to attend the 2009 Classical and Quantum Gravity scientific meeting on Thursday the 4th of June 2009.

This one-day meeting, held in the Franklin theatre at 76 Portland Place in London, will begin at 9.30am and run until 4.30pm. Members of the Classical and Quantum Gravity editorial board will present short talks throughout the day concerning their research.

The programme is as follows:

9.30 – Arrival + Coffee (provided)

10.00 – Niall Ó Murchadha, University College Cork, Ireland
10.30 – Joseph Samuel, Raman Research Institute, Bangalore, India
11.00 – Roh-Suan Tung, Shanghai Normal University, Shanghai, China
11.30 – Daniel Sudarsky, Universidad Nacional Autónoma de México (UNAM), México DF, México

12.00 – Lunch (not provided)

1.30 – Marc Mars, Universidad de Salamanca, Spain
2.00 – Lars Andersson, University of Miami, FL, USA

2.30 – Coffee (provided)

3.00 – Kazuaki Kuroda, University of Tokyo, Japan
3.30 – Luis Lehner, Louisiana State University, Baton Rouge, USA
4.00 – Clifford M Will, Washington University in St Louis, MO, USA

All attendees are welcome. No registration is required. However, we would be grateful if you would email us at cqg@iop.org to let us know if you plan to attend.

A map to Portland Place can be found here: http://www.76portlandplace.com/location/

Best wishes,

Adam Day
Publisher
Classical and Quantum Gravity
cqg[AT]iop.org