Browsing FAS Scholarly Articles by Title

Now showing items 1423-1442 of 18258

    • Birth of a relativistic outflow in the unusual γ-ray transient Swift J164449.3+573451 

      Zauderer, Bevin Ashley; Berger, Edo; Soderberg, Alicia M.; Loeb, Abraham; Narayan, Ramesh; Frail, D. A.; Petitpas, Glen Raymond; Brunthaler, A.; Chornock, Ryan T.; Carpenter, J. M.; Pooley, G. G.; Mooley, K.; Kulkarni, S. R.; Margutti, Raffaella; Fox, D. B.; Nakar, E.; Patel, Nimesh A.; Volgenau, N. H.; Culverhouse, T. L.; Bietenholz, M. F.; Rupen, M. P.; Max-Moerbeck, W.; Readhead, A. C. S.; Richards, J.; Shepherd, M.; Storm, S.; Hull, Charles L. H. (Springer Nature, 2011)
      Active galactic nuclei, which are powered by long-term accretion onto central supermassive black holes, produce1 relativistic jets with lifetimes of at least one million years, and the observation of the birth of such a ...

    • Birth weight-for-gestational age is associated with DNA methylation at birth and in childhood 

      Agha, Golareh; Hajj, Hanine; Rifas-Shiman, Sheryl L.; Just, Allan C.; Hivert, Marie-France; Burris, Heather H.; Lin, Xihong; Litonjua, Augusto A.; Oken, Emily; DeMeo, Dawn L.; Gillman, Matthew W.; Baccarelli, Andrea A. (BioMed Central, 2016)
      Background: Both higher and lower fetal growth are associated with cardio-metabolic health later in life, suggesting that prenatal developmental programming determines long-term cardiovascular disease risk. Epigenetic ...

    • Birthdays to Remember 

      Browne, Janet E (Nature Publishing Group, 2008)

    • Birthplace Diversity and Economic Prosperity 

      Alesina, Alberto Francesco; Harnoss, Johann; Rapoport, Hillel (2015)
      We propose an index of population diversity based on peopleís birthplaces and decompose it into a size (share of immigrants) and a variety (diversity of immigrants) component. We show that birthplace diversity is largely ...

    • The Black Dervish of Armenian Futurism 

      Russell, James R. (National Association for Armenian Studies and Research, 2014-05-12)

    • Black Hole Accretion 

      Narayan, R. (American Association for the Advancement of Science, 2005)
      Black holes are most often detected by the radiation produced when they gravitationally pull in surrounding gas, in a process called accretion. The efficiency with which the hot gas radiates its thermal energy strongly ...

    • Black Hole and Neutron Star Transients in Quiescence 

      Menou, Kristen; Esin, Ann A.; Narayan, Ramesh; Garcia, Michael R.; Lasota, Jean-Pierre; McClintock, Jeffrey E. (American Astronomical Society, 1999)
      We consider the X-ray luminosity difference between neutron star and black hole soft X-ray transients (NS and BH SXTs) in quiescence. The current observational data suggest that BH SXTs are significantly fainter than NS ...

    • Black hole attractors and the topological string 

      Ooguri, Hirosi; Strominger, Andrew; Vafa, Cumrun (American Physical Society, 2004)
      A simple relationship of the form Z(BH)=|Z(top)|(2) is conjectured, where Z(BH) is a supersymmetric partition function for a four-dimensional BPS black hole in a Calabi-Yau compactification of Type II superstring theory ...

    • Black Hole Bound States in AdS(3) x S**2 

      de Boer, Jan; Denef, Frederik; El-Showk, Sheer; Messamah, Ilies; Van den Bleeken, Dieter (Institute of Physics, 2008)
      We systematically construct the geometries dual to the 1+1 dimensional (0, 4) conformal field theories that arise in the low-energy description of wrapped M5-branes in S<sup>1</sup> × CY<sub>3</sub> compactifications of ...

    • Black hole deconstruction 

      Denef, Frederik; Gaiotto, Davide; Strominger, Andrew E.; Bleeken, Dieter; Yin, Xi (Springer-Verlag, 2012)
      A D4-D0 black hole can be deconstructed into a bound state of D0 branes with a D6-D6 pair containing worldvolume fluxes. The exact spacetime solution is known and resembles a D0 accretion disk surrounding a D6-D6 core. We ...

    • Black Hole Determinants and Quasinormal Modes 

      Denef, Frederik; Hartnoll, Sean; Sachdev, Subir (Institute of Physics, 2010)
      We derive an expression for functional determinants in thermal spacetimes as a product over the corresponding quasinormal modes. As simple applications we give efficient computations of scalar determinants in thermal AdS, ...

    • Black Hole Event Horizon 

      Narayan, Ramesh (Publication Office of Progress of Theoretical Physics, 2004)
      Type I X-ray bursts are frequently observed in neutron star X-ray binaries, but no Type I burst has ever been seen in any black hole X-ray binary. It is argued that the lack of bursts in the latter sources is strong evidence ...

    • The Black Hole Mass Distribution in the Galaxy 

      Özel, Feryal; Psaltis, Dimitrios; Narayan, Ramesh; McClintock, Jeffrey E. (IOP Publishing, 2010)
      We use dynamical mass measurements of 16 black holes in transient low-mass X-ray binaries to infer the stellar black hole mass distribution in the parent population. We find that the observations are best described by a ...

    • Black Hole Spin and the Radio Loud/Quiet Dichotomy of Active Galactic Nuclei 

      Tchekhovskoy, Alexander; Narayan, Ramesh; McKinney, Jonathan C. (IOP Publishing, 2010)
      Radio loud active galactic nuclei (AGNs) are on average 1000 times brighter in the radio band compared to radio quiet AGNs. We investigate whether this radio loud/quiet dichotomy can be due to differences in the spin of ...

    • Black Hole Spin via Continuum Fitting and the Role of Spin in Powering Transient Jets 

      McClintock, Jeffrey E.; Narayan, Ramesh; Steiner, James (Springer Science + Business Media, 2013)
      The spins of ten stellar black holes have been measured using the continuum- fitting method. These black holes are located in two distinct classes of X-ray binary systems, one that is persistently X-ray bright and another ...

    • Black Hole Superradiance From Kerr/CFT 

      Bredberg, Irene; Hartman, Thomas; Song, Wei; Strominger, Andrew E. (Springer Verlag, 2010)
      The superradiant scattering of a scalar field with frequency and angular momentum (w,m) by a near-extreme Kerr black hole with mass and spin (M, J) was derived in the seventies by Starobinsky, Churilov, Press and Teukolsky. ...

    • Black Holes and Quantum Gravity at the LHC 

      Meade, Patrick; Randall, Lisa (Spinger Verlag, 2008)
      We argue that the highly studied black hole signatures based on thermal multiparticle final states are very unlikely and only occur in a very limited parameter regime if at all. However, we show that if the higher-dimensional ...

    • Black holes as incompressible fluids on the sphere 

      Bredberg, Irene; Strominger, Andrew E. (Springer-Verlag, 2012)
      We consider finite deformations of the p + 2-dimensional Schwarzschild geometry which obey the vacuum Einstein equation, preserve the mean curvature and induced conformal metric on a sphere a distance λ from the horizon ...

    • Black holes in astrophysics 

      Narayan, Ramesh (IOP Publishing, 2005)
      This paper reviews the current status of black hole (BH) astrophysics, focusing on topics of interest to a physics audience. Astronomers have discovered dozens of compact objects with masses greater than 3M(.), the likely ...

    • Black Holes in Galaxy Mergers: Evolution of Quasars 

      Hopkins, Philip F.; Hernquist, Lars; Cox, Thomas J.; Di Matteo, Tiziana; Martini, Paul; Robertson, Brant; Springel, Volker (American Astronomical Society, 2005)
      Based on numerical simulations of gas- rich galaxy mergers, we discuss amodel in which quasar activity is tied to the self- regulated growth of supermassive black holes in galaxies. The nuclear inflow of gas attending a ...