tipa -- 8/1/2014

Velocity anti-correlation of diametrically opposed galaxy satellites in the low redshift universe

• Neil G. Ibata, Rodrigo A. Ibata, Benoit Famaey, Geraint F. Lewis

Nonlinear evolution of dark matter subhalos and applications to warm dark matter

• Anthony R. Pullen, Andrew J. Benson, Leonidas A. Moustakas

The NuSTAR spectrum of Mrk 335: Extreme relativistic effects within 2 gravitational radii of the event horizon?

• M. L. Parker, D. R. Wilkins, A. C. Fabian, D. Grupe, T. Dauser, G. Matt, F. A. Harrison, L. Brenneman, S. E. Boggs, F. E. Christensen, W. W. Craig, L. C. Gallo, C. J. Hailey, E. Kara, S. Komossa, A. Marinucci, J. M. Miller, G. Risaliti, D. Stern, D. J. Walton, W. W. Zhang

From Engine to Afterglow: Collapsars Naturally Produce Top-Heavy Jets and Early-Time Plateaus in Gamma Ray Burst Afterglows

• Paul C. Duffell, Andrew I. MacFadyen

Power spectrum tomography of dark matter annihilation with local galaxy distribution

• Shin'ichiro Ando

Constraining the neutrino emission of gravitationally lensed Flat-Spectrum Radio Quasars with ANTARES data

• ANTARES Collaboration

tipa -- 7/31/2014

The Spectrum and Morphology of the Fermi Bubbles

• Fermi-LAT Collaboration

Dust Formation in the Presence of Photons I: Evaporation Rates for Small Dust Grains

• C.S. Kochanek (Department of Astronomy, The Ohio State University)

tipa -- 7/30/2014

Finding $η$ Car Analogs in Nearby Galaxies Using Spitzer: II. Identification of An Emerging Class of Extragalactic Self-Obscured Stars

• Rubab Khan, C. S. Kochanek, K. Z. Stanek, Jill Gerke

Describing the Observed Cosmic Neutrinos by Interactions of Nuclei with Matter

• Walter Winter

The origin of the 'local' 1/4 keV X-ray flux in both charge exchange and a hot bubble

• M. Galeazzi, M. Chiao, M. R. Collier, T. Cravens, D. Koutroumpa, K. D. Kuntz, R. Lallement, S. T. Lepri, D. McCammon, K. Morgan, F. S. Porter, I. P. Robertson, S. L. Snowden, N. E. Thomas, Y. Uprety, E. Ursino, B. M. Walsh

Impact of Population~III binaries on early cosmic evolution

• Ke-Jung Chen (1,2), Volker Bromm (3), Alexander Heger (2,4,5), Myoungwon Jeon (3), Stan Woosley (1) ((1) UCSC, (2) UMinn, (3) UT-Austin (4) Monash (5) JINA)

The cosmological Lithium problem outside the Galaxy: the Sagittarius globular cluster M54

• A. Mucciarelli, M. Salaris, P. Bonifacio, L. Monaco, S. Villanova

Stimulated neutrino transformation through turbulence on a changing density profile and application to supernovae

• Kelly M. Patton, James P. Kneller, Gail C. McLaughlin

Coherent neutrino-nucleus scattering detection with a CsI[Na] scintillator at the SNS spallation source

• J.I. Collar, N.E. Fields, E. Fuller, M. Hai, T.W. Hossbach, J.L. Orrell, G. Perumpilly, B. Scholz

tipa -- 7/29/2014

Galactic r-process enrichment by neutron star mergers in cosmological simulations of a Milky Way-mass galaxy

• Freeke van de Voort (1 and 2), Eliot Quataert (1), Philip F. Hopkins (3), Dusan Keres (4), Claude-Andre Faucher-Giguere (5) ((1) UC Berkeley (2) ASIAA (3) Caltech (4) UCSD (5) Northwestern)

Search for a Light Sterile Neutrino at Daya Bay

• Daya Bay Collaboration

Measurement of the Inclusive Electron Neutrino Charged Current Cross Section on Carbon with the T2K Near Detector

• T2K Collaboration

tipa -- 7/28/2014

Supernova 2010as: the Lowest-Velocity Member of a Family of Flat-Velocity Type IIb Supernovae

• Gastón Folatelli, Melina C. Bersten, Hanindyo Kuncarayakti, Felipe Olivares Estay, Joseph P. Anderson, Simon Holmbo, Keiichi Maeda, Nidia Morrell, Ken'ichi Nomoto, Giuliano Pignata, Maximilian Stritzinger, Carlos Contreras, Francisco Förster, Mario Hamuy, Mark M. Phillips, José Luis Prieto, Stefano Valenti, Paulo Afonso, Konrad Altenmüller, Jonny Elliott, Jochen Greiner, Adria Updike, Joshua B. Haislip, Aaron P. LaCluyze, Justin P. Moore, Daniel E. Reichart

Cosmic ray acceleration at perpendicular shocks in supernova remnants

• Gilles Ferrand, Rebecca J. Danos, Andreas Shalchi, Samar Safi-Harb, Paul Edmon, Peter Mendygral

Search for surviving companions in type Ia supernova remnants

• Kuo-Chuan Pan, Paul M. Ricker, Ronald E. Taam

tipa -- 7/25/2014

A Correlation Between Hard Gamma-ray Sources and Cosmic Voids Along the Line of Sight

• A. Furniss, P. M. Sutter, J. R. Primack, A. Dominguez

Stellar tidal disruption candidates found by cross-correlating the ROSAT Bright Source Catalogue and XMM-Newton observations

• Ildar Khabibullin, Sergey Sazonov

Measurement of the rate of stellar tidal disruption flares

• Sjoert van Velzen, Glennys R. Farrar

tipa -- 7/24/2014

Transparent Helium in Stripped Envelope Supernovae

• Anthony L. Piro, Viktoriya S. Morozova

A Northern Sky Survey for Point-Like Sources of EeV Neutral Particles with the Telescope Array Experiment

• The Telescope Array Collaboration

Diffusion of cosmic rays at EeV energies in inhomogeneous extragalactic magnetic fields

• Rafael Alves Batista, Guenter Sigl

Six Faint Gamma-ray Pulsars Seen with the Fermi Large Area Telescope -- Towards a Sample Blending into the Background

• X. Hou, D. A. Smith, L. Guillemot, C. C. Cheung, I. Cognard, H. A. Craig, C. M. Espinoza, S. Johnston, M. Kramer, O. Reimer, T. Reposeur, R. Shannon, B. W. Stappers, P. Weltevrede

tipa -- 7/23/2014

Constraints on Core Collapse from the Black Hole Mass Function

• C.S. Kochanek (Department of Astronomy, The Ohio State University)

Inverse cascade of non-helical magnetic turbulence in a relativistic fluid

• Jonathan Zrake

Challenges in Explaining the Galactic Center Gamma-Ray Excess with Millisecond Pulsars

• Ilias Cholis, Dan Hooper, Tim Linden

Cosmic-ray pressure driven magnetic field amplification: dimensional, radiative and field orientation effects

• T.P. Downes, L. O'C. Drury

Diffuse Atomic and Molecular Gas in the Interstellar Medium of M82 toward SN 2014J

• Adam M. Ritchey (1), Daniel E. Welty (2), Julie A. Dahlstrom (3), Donald G. York (2) ((1) Univ. of Washington, (2) Univ. of Chicago, (3) Carthage College)

Muons in air showers at the Pierre Auger Observatory: Measurement of atmospheric production depth

• Pierre Auger Collaboration

tipa -- 7/22/2014

The coupled effect of tides and stellar winds on the evolution of compact binaries

• Serena Repetto, Gijs Nelemans

The lifetime of cosmic rays in the Milky Way

• Paolo Lipari

A New Determination of the Spectra and Luminosity Function of Gamma-Ray Millisecond Pulsars

• Ilias Cholis, Dan Hooper, Tim Linden

tipa -- 7/21/2014

A giant radio halo in the cool core cluster CL1821+643

• A. Bonafede, H.T. Intema, M. Brüggen, H. R. Russell, G. Ogrean, K. Basu, M. Sommer, R.J. van Weeren, R. Cassano, A. C. Fabian, H. J. A. Röttgering

Echography of young stars reveals their evolution

• K. Zwintz, L. Fossati, T. Ryabchikova, D. Guenther, C. Aerts, T. G. Barnes, N. Themessl, D. Lorenz, C. Cameron, R. Kuschnig, S. Pollack-Drs, E. Moravveji, A. Baglin, J. M. Matthews, A. F. J. Moffat, E. Poretti, M. Rainer, S. M. Rucinski, D. Sasselov, W. W. Weiss

GOODS-HERSCHEL: star formation, dust attenuation and the FIR-radio correlation on the Main Sequence of star-forming galaxies up to z~4

• Maurilio Pannella, David Elbaz, Emanuele Daddi, Mark E. Dickinson, Ho Seong Hwang, Corentin Schreiber, Veronica Strazzullo, Herve Aussel, Matthieu Bethermin, Veronique Buat, Vassilis Charmandaris, Anna Cibinel, Stephanie Juneau, Rob Ivison, Damien Le Borgne, Emeric Le Floc'h, Roger Leiton, Lihwai Lin, Georgios Magdis, Glenn E. Morrison, James R. Mullaney, Masato Onodera, Alvio Renzini, Samir Salim, Mark T. Sargent, Douglas Scott, Xinwen Shu, Tao Wang

Local Group dSph radio survey with ATCA (III): Constraints on Particle Dark Matter

• M. Regis, S. Colafrancesco, S. Profumo, W.J.G. de Blok, M. Massardi, L. Richter

A Parametrically Enhanced Hidden Photon Search

• Peter W. Graham, Jeremy Mardon, Surjeet Rajendran, Yue Zhao

Confronting the Dark Matter explanation of the ARCADE excess with AMS data

• Malcolm Fairbairn, Philipp Grothaus

tipa -- 7/18/2014

The stellar initial mass function at z>1

• I. Martín-Navarro, P. G. Pérez-González, I. Trujillo, P. Esquej, A. Vazdekis, H. Domínguez Sánchez, G. Barro, G. Bruzual, S. Charlot, A. Cava, I. Ferreras, N. Espino, F. La Barbera

Connecting GRBs and ULIRGs: A Sensitive, Unbiased Survey for Radio Emission from Gamma-Ray Burst Host Galaxies at 0

• D. A. Perley, R. A. Perley, J. Hjorth, M. J. Michałowski, S. B. Cenko, P. Jakobsson, T. Krühler, A. J. Levan, D. Malesani, N. R. Tanvir

TriAnd and its Siblings: Satellites of Satellites in the Milky Way Halo

• A. J. Deason, V. Belokurov, K. M. Hamren, S. E. Koposov, K. M. Gilbert, R. L. Beaton, C. E. Dorman, P. Guhathakurta, S. R. Majewski, E. C. Cunningham

Exploring Halo Substructure with Giant Stars: The Nature of the Triangulum-Andromeda Stellar Features

• Allyson Sheffield, Kathryn Johnston, Steven Majewski, Guillermo Damke, Whitney Richardson, Rachael Beaton, Helio Rocha-Pinto

Too Many, Too Few, or Just Right? The Predicted Number and Distribution of Milky Way Dwarf Galaxies

• Jonathan R. Hargis, Beth Willman, Annika H. G. Peter

The afterglow of a relativistic shock breakout and low luminosity GRBs

• Rodolfo Barniol Duran, Ehud Nakar, Tsvi Piran, Re'em Sari

Weighing the Giants IV: Cosmology and Neutrino Mass

• Adam B. Mantz (1), Anja von der Linden (2,3), Steven W. Allen (2), Douglas E. Applegate (4), Patrick L. Kelly (5), R. Glenn Morris (2), David A. Rapetti (3), Robert W. Schmidt (6), Saroj Adhikari (7), Mark T. Allen (2), Patricia R. Burchat (2), David L. Burke (2), Matteo Cataneo (3), David Donovon (8), Harald Ebeling (8), Sarah Shandera (7) ((1) KICP Chicago, (2) KIPAC Stanford/SLAC, (3) DARK Cosmology Centre, (4) Bonn, (5) UC Berkeley, (6) Heidelberg, (7) IGC Penn. State, (8) IfA Hawaii)

Electron-capture supernovae exploding within their progenitor wind

• Takashi J. Moriya, Nozomu Tominaga, Norbert Langer, Ken'ichi Nomoto, Sergei I. Blinnikov, Elena I. Sorokina

SN Hunt 248: a super-Eddington outburst from a massive cool hypergiant

• Jon C. Mauerhan, Schuyler D. Van Dyk, Melissa L Graham, WeiKang Zheng, Kelsey I. Clubb, Alexei V. Filippenko, Stefano Valenti, Peter J. Brown, Nathan Smith, D. Andrew Howell, Iair Arcavi

The low-frequency characteristics of PSR J0437-4715 observed with the Murchison Widefield Array

• N. D. Ramesh Bhat, S.M. Ord, S.E. Tremblay, S.J. Tingay, Avinash Deshpande, W. van Straten, S. Oronsaye, G. Bernardi, Judd Bowman, F. Briggs, R.J. Cappallo, Brian Corey, D. Emerich, R Goeke, Lincoln Greenhill, Bryna Hazelton, Jacqueline N. Hewitt, Melanie Johnston-Hollitt, David Kaplan, Justin Kasper, E. Kratzenberg, C.J. Lonsdale, M.J. Lynch, S. McWhirter, D.A. Mitchell, Miguel Morales, Edward H. Morgan, Divya Oberoi, Thayagaraja Prabu, Alan E. E. Rogers, D.A. Roshi, N. Udayashankar, K.S. Srivani, R. Subramanyan, M. Waterson, Randall Wayth, Rachel Webster, Alan Whitney, A. Williams, C.L. Wiliams

Particle-antiparticle asymmetries from annihilations

• Iason Baldes, Nicole F. Bell, Kalliopi Petraki, Raymond R. Volkas

tipa -- 7/17/2014

Shock finding on a moving-mesh: I. Shock statistics in non-radiative cosmological simulations

• Kevin Schaal, Volker Springel

The Discovery of Radio Stars within 10 arcseconds of Sgr A* at 7mm

• F. Yusef-Zadeh, D. A. Roberts, H. Bushouse, M. Wardle, W. Cotton, M. Royster, G. van Moorsel

The Galactic Center cloud G2 and its gas streamer

• Oliver Pfuhl, Stefan Gillessen, Frank Eisenhauer, Reinhard Genzel, Philipp M. Plewa, Thomas Ott, Alessandro Ballone, Marc Schartmann, Andreas Burkert, Tobias K. Fritz, Re'em Sari, Elad Steinberg, Ann-Marie Madigan

Global simulations of axisymmetric radiative black hole accretion disks in general relativity with a sub-grid magnetic dynamo

• Aleksander Sadowski, Ramesh Narayan, Alexander Tchekhovskoy, David Abarca, Yucong Zhu, Jonathan C. McKinney

Rapid formation of large dust grains in the luminous supernova SN 2010jl

• Christa Gall, Jens Hjorth, Darach Watson, Eli Dwek, Justyn R. Maund, Ori Fox, Giorgos Leloudas, Daniele Malesani, Avril C. Day-Jones

The hyperon puzzle: new hints from Quantum Monte Carlo calculations

• Diego Lonardoni, Alessandro Lovato, Stefano Gandolfi, Francesco Pederiva

The Effect of Doppler Broadening on the $6.3 \ PeV$ $W^-$ Resonance in $\barν_e e^-$ Collisions

• Amit Loewy, Shmuel Nussinov, Sheldon L. Glashow

tipa -- 7/16/2014

The History of R-Process Enrichment in the Milky Way

• Sijing Shen (UCSC), Ryan Cooke (UCSC), Enrico Ramirez-Ruiz (UCSC), Piero Madau (UCSC), Lucio Mayer (U of Zurich), Javiera Guedes

The variable hard X-ray emission of NGC4945 as observed by NuSTAR

• Simonetta Puccetti, Andrea Comastri, Fabrizio Fiore, Patricia Arévalo, Guido Risaliti, Franz E. Bauer, William N. Brandt, Daniel Stern, Fiona A. Harrison, David M. Alexander, Steve E. Boggs, Finn E. Christensen, William W. Craig, Poshak Gandhi, Charles J. Hailey, Michael R. Koss, George B. Lansbury, Bin Luo, Greg M. Madejski, Giorgio Matt, Dominic J. Walton, Will Zhang

The three-dimensional structure of the Eta Carinae Homunculus

• W. Steffen, M. Teodoro, T.I. Madura, J.H. Groh, T.R. Gull, A. Mehner, M.F. Corcoran, A. Damineli, K. Hamaguchi

tipa -- 7/15/2014

Fermi-LAT gamma-ray anisotropy and intensity explained by unresolved Radio-Loud Active Galactic Nuclei

• Mattia Di Mauro, Alessandro Cuoco, Fiorenza Donato, Jennifer M. Siegal-Gaskins

The Mass Dependance of Satellite Quenching in Milky Way-like Halos

• John I. Phillips, Coral Wheeler, Michael C. Cooper, Michael Boylan-Kolchin, James S. Bullock, Erik Tollerud

Rotational Corrections to Neutron-Star Radius Measurements from Thermal Spectra

• Michi Baubock, Feryal Ozel, Dimitrios Psaltis, Sharon M. Morsink

Discovery of GeV emission from the direction of the luminous infrared galaxy NGC 2146

• Qing-Wen Tang, Xiang-Yu Wang, Pak-Hin Thomas Tam

Light Curve Properties of Supernovae Associated With Gamma-ray Bursts

• Xue Li, Jens Hjorth

MAGIC search for VHE $γ$-ray emission from AE Aquarii in a multiwavelength context

• MAGIC Collaboration

"Explosive regime" should dominate collisions of ultra-high energy cosmic rays

• Tigran Kalaydzhyan, Edward Shuryak

Observation of nu_tau appearance in the CNGS beam with the OPERA experiment

• OPERA Collaboration

Using L/E Oscillation Probability Distributions

• A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh, G. B. Mills, J. Mirabal, C. D. Moore, J. Mousseau, P. Nienaber, B. Osmanov, Z. Pavlovic, D. Perevalov, C. C. Polly, H. Ray, B. P. Roe, A. D. Russell, M. H. Shaevitz, J. Spitz, I. Stancu, R. Tayloe, R. G. Van de Water, D. H. White, D. A. Wickremasinghe, G. P. Zeller, E. D. Zimmerman (MiniBooNE Collaboration)

tipa -- 7/14/2014

Radio Frequency Models of Novae in eruption. I. The Free-Free Process in Bipolar Morphologies

• V. A. R. M. Ribeiro, L. Chomiuk, U. Munari, W. Steffen, N. Koning, T. J. O'Brien, T. Simon, P. A. Woudt, M. F. Bode

Charm decay in slow-jet supernovae as the origin of the IceCube ultra-high energy neutrino events

• Atri Bhattacharya, Rikard Enberg, Mary Hall Reno, Ina Sarcevic

Early 56Ni decay γ-rays from SN2014J suggest an unusual explosion

• Roland Diehl, Thomas Siegert, Wolfgang Hillebrandt, Sergei A. Grebenev, Jochen Greiner, Martin Krause, Markus Kromer, Keiichi Maeda, Friedrich Roepke, Stefan Taubenberger

Results on low mass WIMPs using an upgraded CRESST-II detector

• CRESST Collaboration

Glashow resonance as a window into cosmic neutrino sources

• V. Barger, Lingjun Fu, J.G. Learned, D. Marfatia, S. Pakvasa, T.J. Weiler

Tidal disruption of a star in the Schwarzschild spacetime: relativistic effects in the return rate of debris

• Roseanne M. Cheng, Tamara Bogdanovic

Leptophilic Dark Matter with $Z'$ interactions

• Nicole F. Bell, Yi Cai, Rebecca K. Leane, Anibal D. Medina

tipa -- 7/11/2014

On the parallel spectrum in MHD Turbulence

• Andrey Beresnyak

Probing Satellite Quenching With Galaxy Clustering

• Robert T. Chamberlain, Neal Dalal, Andrew Hearin, Paul Ricker

High-resolution numerical-relativity simulations for the merger of binary magnetized neutron stars

• Kenta Kiuchi, Koutarou Kyutoku, Yuichiro Sekiguchi, Masaru Shibata, Tomohide Wada

An Efficient Fokker-Planck Solver and its Application to Stochastic Particle Acceleration in Galaxy Clusters

• Julius Donnert (IRA), Gianfranco Brunetti (IRA)

Hadronic supercriticality as a trigger for GRB emission

• Maria Petropoulou, Stavros Dimitrakoudis, Apostolos Mastichiadis, Dimitrios Giannios

tipa -- 7/10/2014

Neutrino Lighthouse at Sagittarius A*

• Y. Bai, A. J. Barger, V. Barger, R. Lu, A. D. Peterson, J. Salvado

Origin of the Galactic 511 keV emission from positrons produced in irregular supernovae

• Hagai B. Perets

The SAMI Galaxy Survey: Shocks and Outflows in a normal star-forming galaxy

• I-Ting Ho, Lisa J. Kewley, Michael A. Dopita, Anne M. Medling, J. T. Allen, Joss Bland-Hawthorn, Jessica V. Bloom, Julia J. Bryant, Scott M. Croom, L. M. R. Fogarty, Michael Goodwin, Andy W. Green, Iraklis S. Konstantopoulos, Jon S. Lawrence, Matt S. Owers, Samuel Richards, Rob Sharp

Strongest model-independent bound on the lifetime of Dark Matter

• Benjamin Audren, Julien Lesgourgues, Gianpiero Mangano, Pasquale Dario Serpico, Thomas Tram

Direct constraints on diffusion models from cosmic-ray positron data: Excluding the MIN model for dark matter searches

• Julien Lavalle, David Maurin, Antje Putze

Dark Sky Simulations: Early Data Release

• Samuel W. Skillman, Michael S. Warren, Matthew J. Turk, Risa H. Wechsler, Daniel E. Holz, P. M. Sutter

tipa -- 7/9/2014

Stacking the Invisibles: A Guided Search for Low-Luminosity Milky Way Satellites

• B. Sesar, S. R. Banholzer, J. G. Cohen, N. F. Martin, C. J. Grillmair, D. Levitan, R. R. Laher, E. O. Ofek, J. A. Surace, S. R. Kulkarni, T. A. Prince, H.-W. Rix

The VLT-FLAMES Tarantula Survey XVII. Physical and wind properties of massive stars at the top of the main sequence

• Joachim M. Bestenlehner, Götz Gräfener, Jorick S. Vink, F. Najarro, A. de Koter, H. Sana, C. J. Evans, P. A. Crowther, V. Hénault-Brunet, A. Herrero, N. Langer, F. R. N. Schneider, S. Simón-Díaz, W. D. Taylor, N. R. Walborn

NuSTAR unveils a Compton-thick Type 2 quasar in Mrk 34

• P. Gandhi (Durham), G.B. Lansbury, D.M. Alexander, D. Stern, P. Arévalo, D.R. Ballantyne, M. Baloković, F.E. Bauer, S.E. Boggs, W.N. Brandt, M. Brightman, F.E. Christensen, A. Comastri, W.W. Craig, A. Del Moro, M. Elvis, A.C. Fabian, C.J. Hailey, F.A. Harrison, R.C. Hickox, M. Koss, S.M. LaMassa, B. Luo, G.M. Madejski, A.F. Ptak, S. Puccetti, S.H. Teng, C.M. Urry, D.J. Walton, W.W. Zhang

The orbital motion of the Quintuplet cluster - a common origin for the Arches and Quintuplet clusters?

• Andrea Stolte, Benjamin Hussmann, Mark R. Morris, Andrea M. Ghez, Wolfgang Brandner, Jessica R. Lu, William I. Clarkson, Maryam Habibi, Keith Matthews

A Delayed Transition to the Hard State for 4U 1630-47 at the End of Its 2010 Outburst

• John A. Tomsick (SSL/UCB), Kazutaka Yamaoka (Nagoya University), Stephane Corbel (University Paris VII & CEA Saclay), Emrah Kalemci (Sabanci University), Simone Migliari (Universitat de Barcelona), Philip Kaaret (University of Iowa)

Antiproton constraints on the GeV gamma-ray excess: a comprehensive analysis

• Marco Cirelli, Daniele Gaggero, Gaëlle Giesen, Marco Taoso, Alfredo Urbano

Kenneth G. Wilson: Renormalized After-Dinner Anecdotes

• Paul Ginsparg