450 citations
- Philadelphia UniversityUS4 papers
- European Organization for Nuclear ResearchCH2 papers
- Max Planck Institute for PhysicsDE2 papers
- National University of Sciences and TechnologyPK2 papers
- University of PennsylvaniaUS2 papers
- Albert Einstein College of MedicineUS1 paper
- California Institute of TechnologyUS1 paper
- Center for Theoretical PhysicsPL1 paper
- Institute for Advanced StudyUS1 paper
- Istituto Nazionale di Fisica Nucleare, Sezione di Roma IIT1 paper
- Laboratoire de Physique ThéoriqueFR1 paper
- Ludwig-Maximilians-Universität MünchenDE1 paper
Showing 2008Show all
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gr-qc2008★ 450 cited
Relativistic images of Schwarzschild black hole lensing
K. S. Virbhadra
We model massive dark objects at centers of many galaxies as Schwarzschild black hole lenses and study gravitational lensing by them in detail. We show that the ratio of mass of a…
hep-th2008★ 29 cited
Comments on Orientifolds without Vector Structure
Constantin Bachas, Massimo Bianchi, Ralph Blumenhagen +2
We revisit type I compactifications with a Spin(32)/Z2 gauge bundle that admits no vector structure. We elucidate the relation of this Z2 obstruction to discrete B-field flux and t…
math.PR2008★ 8 cited
Conditions for stability and instability of retrial queueing systems with general retrial times
Tewfik Kernane
We study the stability of single server retrial queues under general distribution for retrial times and stationary ergodic service times, for three main retrial policies studied in…