http://prl.aps.org/ Recently published articles in Phys. Rev. Lett. in the Table of Content section "Gravitation and Astrophysics" en-us Copyright (c) 2009 The American Physical Society 2009-11-22T06:20:13-05:00 assocpub@aps.org rss@aps.org hourly 4 2009-11-22T06:20:13-05:00 rss@aps.org http://link.aps.org/doi/10.1103/PhysRevLett.103.211301 Author(s): Pat Scott and Sofia Sivertsson<br/>Ultracompact minihalos have been proposed as a new class of dark matter structure. They would be produced by phase transitions in the early Universe or features in the inflaton potential, and constitute nonbaryonic massive compact halo objects today. We examine the prospects of detecting these minih...<br/>[Phys. Rev. Lett. 103, 211301] Published Fri Nov 20, 2009 Pat Scott and Sofia Sivertsson 2009-11-20T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.211301 Phys. Rev. Lett. 103, 211301 text/html article Physical Review Letters 103 21 2009-11-20T00:00:00-05:00 211301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.211102 Author(s): De-Hua Wen, Bao-An Li, and Lie-Wen Chen<br/>Considering the non-Newtonian gravity proposed in grand unification theories, we show that the stability and observed global properties of neutron stars cannot rule out the supersoft nuclear symmetry energies at suprasaturation densities. The degree of possible violation of the inverse-square law of...<br/>[Phys. Rev. Lett. 103, 211102] Published Mon Nov 16, 2009 De-Hua Wen, Bao-An Li, and Lie-Wen Chen 2009-11-16T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.211102 Phys. Rev. Lett. 103, 211102 text/html article Physical Review Letters 103 21 2009-11-16T00:00:00-05:00 211102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.211101 Author(s): S. D. Bale, J. C. Kasper, G. G. Howes, E. Quataert, C. Salem, and D. Sundkvist<br/>The proton temperature anisotropy in the solar wind is known to be constrained by the theoretical thresholds for pressure-anisotropy-driven instabilities. Here, we use approximately 1×10^{6} independent measurements of gyroscale magnetic fluctuations in the solar wind to show for the first time tha...<br/>[Phys. Rev. Lett. 103, 211101] Published Mon Nov 16, 2009 S. D. Bale, J. C. Kasper, G. G. Howes, E. Quataert, C. Salem, and D. Sundkvist 2009-11-16T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.211101 Phys. Rev. Lett. 103, 211101 text/html article Physical Review Letters 103 21 2009-11-16T00:00:00-05:00 211101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.201102 Author(s): E. Babichev, C. Deffayet, and R. Ziour<br/>We obtain static, spherically symmetric, and asymptotically flat numerical solutions of massive gravity with a source. Those solutions show, for the first time explicitly, a recovery of the Schwarzschild solution of general relativity via the so-called Vainshtein mechanism.<br/>[Phys. Rev. Lett. 103, 201102] Published Thu Nov 12, 2009 E. Babichev, C. Deffayet, and R. Ziour 2009-11-12T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.201102 Phys. Rev. Lett. 103, 201102 text/html article Physical Review Letters 103 20 2009-11-12T00:00:00-05:00 201102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.201101 Author(s): Charles W. Smith, Joshua E. Stawarz, Bernard J. Vasquez, Miriam A. Forman, and Benjamin T. MacBride<br/>Analysis of the scaling of the mixed third moments of velocity and magnetic fluctuations in the solar wind plasma, and the energy cascade rates derived from the scaling, reveal a strong dependence on the amount of cross-field correlation between the velocity and magnetic field fluctuations. When the...<br/>[Phys. Rev. Lett. 103, 201101] Published Tue Nov 10, 2009 Charles W. Smith, Joshua E. Stawarz, Bernard J. Vasquez, Miriam A. Forman, and Benjamin T. MacBride 2009-11-10T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.201101 Phys. Rev. Lett. 103, 201101 text/html article Physical Review Letters 103 20 2009-11-10T00:00:00-05:00 201101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.191301 Author(s): O. Scholten, S. Buitink, J. Bacelar, R. Braun, A. G. de Bruyn, H. Falcke, K. Singh, B. Stappers, R. G. Strom, and R. al Yahyaoui<br/>Particle cascades initiated by ultrahigh energy neutrinos in the lunar regolith will emit an electromagnetic pulse with a time duration of the order of nanoseconds through a process known as the Askaryan effect. It has been shown that in an observing window around 150 MHz there is a maximum chance ...<br/>[Phys. Rev. Lett. 103, 191301] Published Fri Nov 06, 2009 O. Scholten, S. Buitink, J. Bacelar, R. Braun, A. G. de Bruyn, H. Falcke, K. Singh, B. Stappers, R. G. Strom, and R. al Yahyaoui 2009-11-06T00:00:00-05:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.191301 Phys. Rev. Lett. 103, 191301 text/html article Physical Review Letters 103 19 2009-11-06T00:00:00-05:00 191301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.181302 Author(s): Anders Pinzke, Christoph Pfrommer, and Lars Bergström<br/>To fit recent data, e^{±} from dark matter (DM) needs a boosted annihilation rate. This may imply an observable level of gamma rays from nearby galaxy clusters for the Fermi satellite. Using EGRET data, we limit the minimum mass of DM substructures to be about 5×10^{3} times larger than for cold D...<br/>[Phys. Rev. Lett. 103, 181302] Published Thu Oct 29, 2009 Anders Pinzke, Christoph Pfrommer, and Lars Bergström 2009-10-29T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.181302 Phys. Rev. Lett. 103, 181302 text/html article Physical Review Letters 103 18 2009-10-29T00:00:00-04:00 181302 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.181301 Author(s): Daniel B. Thomas, Carlo R. Contaldi, and João Magueijo<br/>Vector perturbations sourced by topological defects can generate rotations in the lensing of background galaxies. This is a potential smoking gun for the existence of defects since rotation generates a curl-like component in the weak lensing signal which is not generated by standard density perturba...<br/>[Phys. Rev. Lett. 103, 181301] Published Wed Oct 28, 2009 Daniel B. Thomas, Carlo R. Contaldi, and João Magueijo 2009-10-28T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.181301 Phys. Rev. Lett. 103, 181301 text/html article Physical Review Letters 103 18 2009-10-28T00:00:00-04:00 181301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.181102 Author(s): Holger J. Pletsch and Bruce Allen<br/>Fully coherent searches (over realistic ranges of parameter space and year-long observation times) for unknown sources of continuous gravitational waves are computationally prohibitive. Less expensive hierarchical searches divide the data into shorter segments which are analyzed coherently, then det...<br/>[Phys. Rev. Lett. 103, 181102] Published Tue Oct 27, 2009 Holger J. Pletsch and Bruce Allen 2009-10-27T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.181102 Phys. Rev. Lett. 103, 181102 text/html article Physical Review Letters 103 18 2009-10-27T00:00:00-04:00 181102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.181101 Author(s): Andrew W. Steiner and Anna L. Watts<br/>We show that the fundamental seismic shear mode, observed as a quasiperiodic oscillation in giant flares emitted by highly magnetized neutron stars, is particularly sensitive to the nuclear physics of the crust. The identification of an oscillation at ≈30  Hz as the fundamental crustal shear m...<br/>[Phys. Rev. Lett. 103, 181101] Published Mon Oct 26, 2009 Andrew W. Steiner and Anna L. Watts 2009-10-26T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.181101 Phys. Rev. Lett. 103, 181101 text/html article Physical Review Letters 103 18 2009-10-26T00:00:00-04:00 181101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.171102 Author(s): G. Pagliara, M. Hempel, and J. Schaffner-Bielich<br/>The transition from hadronic to quark matter at high density is a strong first order phase transition if the surface tension between the two phases is large. While this implies a constant-pressure mixed phase in cold neutron star matter this is not the case for the hot and lepton rich matter of prot...<br/>[Phys. Rev. Lett. 103, 171102] Published Fri Oct 23, 2009 G. Pagliara, M. Hempel, and J. Schaffner-Bielich 2009-10-23T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.171102 Phys. Rev. Lett. 103, 171102 text/html article Physical Review Letters 103 17 2009-10-23T00:00:00-04:00 171102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.171101 Author(s): Keiko Kokeyama, Shuichi Sato, Atsushi Nishizawa, Seiji Kawamura, Yanbei Chen, and Akio Sugamoto<br/>The displacement- and frequency-noise-free interferometer (DFI) is a multiple laser interferometer array for gravitational-wave detection free from both the displacement noise of optics and laser frequency noise. So far, partial experimental demonstrations of the DFI have been done in 2D table top e...<br/>[Phys. Rev. Lett. 103, 171101] Published Thu Oct 22, 2009 Keiko Kokeyama, Shuichi Sato, Atsushi Nishizawa, Seiji Kawamura, Yanbei Chen, and Akio Sugamoto 2009-10-22T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.171101 Phys. Rev. Lett. 103, 171101 text/html article Physical Review Letters 103 17 2009-10-22T00:00:00-04:00 171101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.171302 Author(s): Giovanni Amelino-Camelia, Claus Laemmerzahl, Flavio Mercati, and Guglielmo M. Tino<br/>We use the results of ultraprecise cold-atom-recoil experiments to constrain the form of the energy-momentum dispersion relation, a structure that is expected to be modified in several quantum-gravity approaches. Our strategy of analysis applies to the nonrelativistic (small speeds) limit of the dis...<br/>[Phys. Rev. Lett. 103, 171302] Published Wed Oct 21, 2009 Giovanni Amelino-Camelia, Claus Laemmerzahl, Flavio Mercati, and Guglielmo M. Tino 2009-10-21T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.171302 Phys. Rev. Lett. 103, 171302 text/html article Physical Review Letters 103 17 2009-10-21T00:00:00-04:00 171302 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.171301 Author(s): Scott Dodelson and Mika Vesterinen<br/>Neutrinos decoupled from the rest of the cosmic plasma when the Universe was less than one second old, far earlier than the photons, which decoupled at t=380 000 years. Surprisingly, though, the last scattering surface of massive neutrinos is much closer to us than that of the photons. Here we cal...<br/><img src="http://prola.aps.org/graphics/prlsugg30x30.gif" width="30" height="30" alt="PRL Editors' Suggestion"/><br/>[Phys. Rev. Lett. 103, 171301] Published Mon Oct 19, 2009 Scott Dodelson and Mika Vesterinen 2009-10-19T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.171301 Phys. Rev. Lett. 103, 171301 text/html article Physical Review Letters 103 17 2009-10-19T00:00:00-04:00 171301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.161301 Author(s): Torsten Bringmann, Julien Lavalle, and Pierre Salati<br/>Dark matter (DM) “minispikes” around intermediate mass black holes are sometimes quoted as one of the most promising targets for indirect DM searches. Here, we stress that existing cosmic ray data place severe constraints on the possibility to detect DM annihilation signals from these objects in...<br/>[Phys. Rev. Lett. 103, 161301] Published Fri Oct 16, 2009 Torsten Bringmann, Julien Lavalle, and Pierre Salati 2009-10-16T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.161301 Phys. Rev. Lett. 103, 161301 text/html article Physical Review Letters 103 16 2009-10-16T00:00:00-04:00 161301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.161101 Author(s): R. A. Konoplya and A. Zhidenko<br/>We have shown that higher-dimensional Reissner–Nordström–de Sitter black holes are gravitationally unstable for large values of the electric charge and cosmological constant in D≥7 space-time dimensions. We have found the shape of the slightly perturbed black hole at the threshold point of i...<br/>[Phys. Rev. Lett. 103, 161101] Published Mon Oct 12, 2009 R. A. Konoplya and A. Zhidenko 2009-10-12T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.161101 Phys. Rev. Lett. 103, 161101 text/html article Physical Review Letters 103 16 2009-10-12T00:00:00-04:00 161101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.151303 Author(s): Chan-Gyung Park, Jai-chan Hwang, Jae-heon Lee, and Hyerim Noh<br/>We show the importance of properly including the perturbations of the dark energy component in the dynamical dark energy models based on a scalar field and modified gravity theories in order to meet with present and future observational precisions. Based on a simple scaling scalar field dark energy ...<br/>[Phys. Rev. Lett. 103, 151303] Published Fri Oct 09, 2009 Chan-Gyung Park, Jai-chan Hwang, Jae-heon Lee, and Hyerim Noh 2009-10-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.151303 Phys. Rev. Lett. 103, 151303 text/html article Physical Review Letters 103 15 2009-10-09T00:00:00-04:00 151303 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.151302 Author(s): V. N. Lebedenko et al.<br/>We present new experimental constraints on the WIMP-nucleon spin-dependent elastic cross sections using data from the first science run of ZEPLIN-III, a two-phase xenon experiment searching for galactic dark matter weakly interacting massive particles based at the Boulby mine. Analysis of ∼450 â...<br/>[Phys. Rev. Lett. 103, 151302] Published Thu Oct 08, 2009 V. N. Lebedenko et al. 2009-10-08T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.151302 Phys. Rev. Lett. 103, 151302 text/html article Physical Review Letters 103 15 2009-10-08T00:00:00-04:00 151302 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.151301 Author(s): John McDonald<br/>We show that Q-ball decay in Affleck-Dine baryogenesis models can account for dark matter when the annihilation cross section is sufficiently enhanced to explain the positron and electron excesses observed by PAMELA, ATIC, and PPB-BETS. For Affleck-Dine baryogenesis along a d=6 flat direction, the r...<br/>[Phys. Rev. Lett. 103, 151301] Published Tue Oct 06, 2009 John McDonald 2009-10-06T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.151301 Phys. Rev. Lett. 103, 151301 text/html article Physical Review Letters 103 15 2009-10-06T00:00:00-04:00 151301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.141101 Author(s): Ted Jacobson and Thomas P. Sotiriou<br/>It has long been known that a maximally spinning black hole cannot be overspun by tossing in a test body. Here we show that if instead the black hole starts out with below maximal spin, then indeed overspinning can be achieved. We find that requirements on the size and internal structure of the test...<br/>[Phys. Rev. Lett. 103, 141101] Published Mon Sep 28, 2009 Ted Jacobson and Thomas P. Sotiriou 2009-09-28T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.141101 Phys. Rev. Lett. 103, 141101 text/html article Physical Review Letters 103 14 2009-09-28T00:00:00-04:00 141101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.131301 Author(s): Jan de Boer, Kyriakos Papadodimas, and Erik Verlinde<br/>Supersymmetric black holes are characterized by a large number of degenerate ground states. We argue that these black holes, like other quantum mechanical systems with such a degeneracy, are subject to a phenomenon which is called the geometric or Berry’s phase: under adiabatic variations of the b...<br/>[Phys. Rev. Lett. 103, 131301] Published Tue Sep 22, 2009 Jan de Boer, Kyriakos Papadodimas, and Erik Verlinde 2009-09-22T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.131301 Phys. Rev. Lett. 103, 131301 text/html article Physical Review Letters 103 13 2009-09-22T00:00:00-04:00 131301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.131102 Author(s): Ulrich Sperhake, Vitor Cardoso, Frans Pretorius, Emanuele Berti, Tanja Hinderer, and Nicolas Yunes<br/>We study the collision of two highly boosted equal-mass, nonrotating black holes with generic impact parameter. We find such systems to exhibit zoom-whirl behavior when fine-tuning the impact parameter. Near the threshold of immediate merger the remnant black-hole Kerr parameter can be near maximal ...<br/>[Phys. Rev. Lett. 103, 131102] Published Tue Sep 22, 2009 Ulrich Sperhake, Vitor Cardoso, Frans Pretorius, Emanuele Berti, Tanja Hinderer, and Nicolas Yunes 2009-09-22T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.131102 Phys. Rev. Lett. 103, 131102 text/html article Physical Review Letters 103 13 2009-09-22T00:00:00-04:00 131102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.131101 Author(s): James Healy, Janna Levin, and Deirdre Shoemaker<br/>Zoom-whirl behavior has the reputation of being a rare phenomenon. The concern has been that gravitational radiation would drain angular momentum so rapidly that generic orbits would circularize before zoom-whirl behavior could play out, and only rare highly tuned orbits would retain their imprint. ...<br/><img src="http://prola.aps.org/graphics/prlsugg30x30.gif" width="30" height="30" alt="PRL Editors' Suggestion"/><br/>[Phys. Rev. Lett. 103, 131101] Published Tue Sep 22, 2009 James Healy, Janna Levin, and Deirdre Shoemaker 2009-09-22T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.131101 Phys. Rev. Lett. 103, 131101 text/html article Physical Review Letters 103 13 2009-09-22T00:00:00-04:00 131101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.121102 Author(s): Giovanni Morlino<br/>We show that the secondary electrons ejected from the ionization of heavy ions can be injected into the acceleration process that occurs at supernova remnant shocks. This electron injection mechanism works since ions are ionized during the acceleration when they move already with relativistic speed,...<br/>[Phys. Rev. Lett. 103, 121102] Published Tue Sep 15, 2009 Giovanni Morlino 2009-09-15T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.121102 Phys. Rev. Lett. 103, 121102 text/html article Physical Review Letters 103 12 2009-09-15T00:00:00-04:00 121102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.121301 Author(s): Savvas M. Koushiappas and Marc Kamionkowski<br/>We consider the effects of Galactic substructure on energetic neutrinos from annihilation of weakly interacting massive particles that have been captured by the Sun and Earth. Substructure gives rise to a time-varying capture rate and thus to time variation in the annihilation rate and resulting ene...<br/>[Phys. Rev. Lett. 103, 121301] Published Mon Sep 14, 2009 Savvas M. Koushiappas and Marc Kamionkowski 2009-09-14T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.121301 Phys. Rev. Lett. 103, 121301 text/html article Physical Review Letters 103 12 2009-09-14T00:00:00-04:00 121301 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.121101 Author(s): Gentaro Watanabe, Hidetaka Sonoda, Toshiki Maruyama, Katsuhiko Sato, Kenji Yasuoka, and Toshikazu Ebisuzaki<br/>In supernova cores, nuclear “pasta” phases such as a triangular lattice of rodlike nuclei and layered structure of slablike nuclei are considered to exist. However, it is still unclear whether or not they are actually formed in collapsing supernova cores. Using ab initio simulations called quan...<br/><img src="http://prola.aps.org/graphics/prlsugg30x30.gif" width="30" height="30" alt="PRL Editors' Suggestion"/><br/>[Phys. Rev. Lett. 103, 121101] Published Mon Sep 14, 2009 Gentaro Watanabe, Hidetaka Sonoda, Toshiki Maruyama, Katsuhiko Sato, Kenji Yasuoka, and Toshikazu Ebisuzaki 2009-09-14T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.121101 Phys. Rev. Lett. 103, 121101 text/html article Physical Review Letters 103 12 2009-09-14T00:00:00-04:00 121101 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.111303 Author(s): Richard Anantua, Richard Easther, and John T. Giblin<br/>A population of very light primordial black holes which evaporate before nucleosynthesis begins is unconstrained unless the decaying black holes leave stable relics. We show that gravitons Hawking radiated from these black holes would source a substantial stochastic background of high frequency grav...<br/>[Phys. Rev. Lett. 103, 111303] Published Thu Sep 10, 2009 Richard Anantua, Richard Easther, and John T. Giblin 2009-09-10T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.111303 Phys. Rev. Lett. 103, 111303 text/html article Physical Review Letters 103 11 2009-09-10T00:00:00-04:00 111303 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.111302 Author(s): Nir J. Shaviv, Ehud Nakar, and Tsvi Piran<br/>We show that inhomogeneity of cosmic ray (CR) sources, due to the concentration of supernova remnants (SNRs) towards the galactic spiral arms, can naturally explain the anomalous increase in the positron/electron ratio observed by PAMELA. We consistently recover the observed positron fraction betwee...<br/>[Phys. Rev. Lett. 103, 111302] Published Thu Sep 10, 2009 Nir J. Shaviv, Ehud Nakar, and Tsvi Piran 2009-09-10T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.111302 Phys. Rev. Lett. 103, 111302 text/html article Physical Review Letters 103 11 2009-09-10T00:00:00-04:00 111302 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.111102 Author(s): Máximo Bañados, Joseph Silk, and Stephen M. West<br/>We show that intermediate mass black holes conjectured to be the early precursors of supermassive black holes and surrounded by relic cold dark matter density spikes can act as particle accelerators with collisions, in principle, at arbitrarily high center-of-mass energies in the case of Kerr black ...<br/>[Phys. Rev. Lett. 103, 111102] Published Thu Sep 10, 2009 Máximo Bañados, Joseph Silk, and Stephen M. West 2009-09-10T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.111102 Phys. Rev. Lett. 103, 111102 text/html article Physical Review Letters 103 11 2009-09-10T00:00:00-04:00 111102 Gravitation and Astrophysics Gravitation and Astrophysics http://link.aps.org/doi/10.1103/PhysRevLett.103.111301 Author(s): P. Sikivie and Q. Yang<br/>We show that cold dark matter axions thermalize and form a Bose-Einstein condensate (BEC). We obtain the axion state in a homogeneous and isotropic universe, and derive the equations governing small axion perturbations. Because they form a BEC, axions differ from ordinary cold dark matter in the non...<br/>[Phys. Rev. Lett. 103, 111301] Published Wed Sep 09, 2009 P. Sikivie and Q. Yang 2009-09-09T00:00:00-04:00 Personal use only, all commercial or other reuse prohibited 10.1103/PhysRevLett.103.111301 Phys. Rev. Lett. 103, 111301 text/html article Physical Review Letters 103 11 2009-09-09T00:00:00-04:00 111301 Gravitation and Astrophysics Gravitation and Astrophysics