1,517 research outputs found
Charged Schrodinger Black Holes
We construct charged and rotating asymptotically Schrodinger black hole
solutions of IIB supergravity. We begin by obtaining a closed-form expression
for the null Melvin twist of a broad class of type IIB backgrounds, including
solutions of minimal five-dimensional gauged supergravity, and identify the
resulting five-dimensional effective action. We use these results to
demonstrate that the near-horizon physics and thermodynamics of asymptotically
Schrodinger black holes obtained in this way are essentially inherited from
their AdS progenitors, and verify that they admit zero-temperature extremal
limits with AdS_2 near-horizon geometries. Notably, the AdS_2 radius is
parametrically larger than that of the asymptotic Schrodinger space.Comment: 22 pages, LaTe
Nonsupersymmetric brane vacua in stabilized compactifications
We derive the equations for the nonsupersymmetric vacua of D3-branes in the
presence of nonperturbative moduli stabilization in type IIB flux
compactifications, and solve and analyze them in the case of two particular
7-brane embeddings at the bottom of the warped deformed conifold. In the limit
of large volume and long throat, we obtain vacua by imposing a constraint on
the 7-brane embedding. These vacua fill out continuous spaces of higher
dimension than the corresponding supersymmetric vacua, and have negative
effective cosmological constant. Perturbative stability of these vacua is
possible but not generic. Finally, we argue that anti-D3-branes at the tip of
the conifold share the same vacua as D3-branes.Comment: 17 pages, 1 figure, LaTeX. v2: references added, typo fixed. v3:
version appearing in JHE
Brane/flux annihilation transitions and nonperturbative moduli stabilization
By extending the calculation of Kahler moduli stabilization to account for an
embiggened antibrane, we reevaluate brane/flux annihilation in a warped throat
with one stabilized Kahler modulus. We find that depending on the relative size
of various fluxes three things can occur: the decay process proceeds
unhindered, the anti-D3-branes are forbidden to decay classically, or the
entire space decompactifies. Additionally, we show that the Kahler modulus
receives a contribution from the collective 3-brane tension. This allows for a
significant change in compactified volume during the transition and possibly
mitigates some fine tuning otherwise required to achieve large volume.Comment: 25 pages, 6 figures, LaTeX. v2: references adde
Bostonia: The Boston University Alumni Magazine. Volume 12
Founded in 1900, Bostonia magazine is Boston University’s main alumni publication
1936 The Freshman, vol. 3, no. 9
The Freshman was a weekly, student newsletter issued on Mondays throughout the academic year. The newsletter included calendar notices, coverage of campus social events, lectures, and athletic teams. The intent of the publication was to create unity, a sense of community, and class spirit among first year students. Discussion in this edition focuses on exams
1936 The Freshman, vol. 3, no. 12
The Freshman was a weekly, student newsletter issued on Mondays throughout the academic year. The newsletter included calendar notices, coverage of campus social events, lectures, and athletic teams. The intent of the publication was to create unity, a sense of community, and class spirit among first year students
1936 The Freshman, vol. 3, no. 10
The Freshman was a weekly, student newsletter issued on Mondays throughout the academic year. The newsletter included calendar notices, coverage of campus social events, lectures, and athletic teams. The intent of the publication was to create unity, a sense of community, and class spirit among first year students. Coverage includes the story of first year student John Stinchfield being rescued by his roommate Frank Chadwick after falling through the ice while ice skating
1936 The Freshman, vol. 3, no. 11
The Freshman was a weekly, student newsletter issued on Mondays throughout the academic year. The newsletter included calendar notices, coverage of campus social events, lectures, and athletic teams. The intent of the publication was to create unity, a sense of community, and class spirit among first year students. Coverage in this issue includes the search for Olga W. Ashby, wife of Professor Stanley R. Ashby, who went missing on January 27
Visualization of postoperative anterior cruciate ligament reconstruction bone tunnels: Reliability of standard radiographs, CT scans, and 3D virtual reality images
Background and purpose: Non-anatomic bone tunnel placement is the most common cause of a failed ACL reconstruction. Accurate and reproducible methods to visualize and document bone tunnel placement are therefore important. We evaluated the reliability of standard radiographs, CT scans, and a 3-dimensional (3D) virtual reality (VR) approach in visualizing and measuring ACL reconstruction bone tunnel placement. Methods: 50 consecutive patients who underwent single-bundle ACL reconstructions were evaluated postoperatively by standard radiographs, CT scans, and 3D VR images. Tibial and femoral tunnel positions were measured by 2 observers using the traditional methods of Amis, Aglietti, Hoser, Stubli, and the method of Benereau for the VR approach. Results: The tunnel was visualized in 50-82% of the standard radiographs and in 100% of the CT scans and 3D VR images. Using the intraclass correlation coefficient (ICC), the inter- and intraobserver agreement was between 0.39 and 0.83 for the standard femoral and tibial radiographs. CT scans showed an ICC range of 0.49-0.76 for the inter- and intraobserver agreement. The agreement in 3D VR was almost perfect, with an ICC of 0.83 for the femur and 0.95 for the tibia. Interpretation: CT scans and 3D VR images are more reliable in assessing postoperative bone tunnel placement following ACL reconstruction than standard radiographs. Copyright
1955: Abilene Christian College Bible Lectures - Full Text
Delivered in the Auditorium of Abilene Christian College, February, 1955
ABILENE, TEXAS
PRICE, $3.00
FIRM FOUNDATION PUBLISHING HOUSE
Box 77
Austin 61, Texa
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