The COSMOS survey is the largest high redshift galaxy evolution survey ever done -- imaging 2 square degrees with all major space-based and ground based...
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TalkLarge scale structures and galaxy evolution in the COSMOS Survey
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PublicationLimiting the Abundance of LIGO/Virgo Black Holes with Microlensing Observations of Quasars of Finite Size
We present a simple but general argument that strongly limits the abundance of primordial black holes (PBHs) (or other unknown population of compact objects)...
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PublicationLocal approximations to non-linear evolution of density fluctuations
The way in which the evaluation of any moment of the mass distribution, as given by the Zeldovich (1970) approximation, may be reduced to the computation of an...
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TalkMagnetic fields and the outer rotation curve of M31
Recent observations of the rotation curve of M31 show a rise of the outer part that cannot be understood in terms of standard dark matter models or...
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PublicationMass-to-light ratios from the fundamental plane of spiral galaxy discs
The best-fitting two-dimensional plane within the three-dimensional space of spiral galaxy disc observables (rotational velocity vrot, central disc surface...
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PublicationMassive relic galaxies prefer dense environments
We study the preferred environments of z ˜ 0 massive relic galaxies (M⋆ ≳ 1010 M⊙ galaxies with little or no growth from star formation or mergers since z ˜ 2)...
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TalkMatter-antimatter sourced dark matter
Cosmological and astrophysical e xperimental data demark a large share of the limits of our knowledge in fundamental physics. I'll review two pieces of evidence...
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TalkMatters of gravity
Contrary to popular belief, on very large distance scales visible matter stubbornly refuses to "fall" according to the laws of gravity of both Newton and...
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PublicationMicrolensing events of the LMC are better explained by stars within the LMC than by MACHOs
The recently reported microlensing events of the Large Magellanic Cloud (LMC) have caused much excitement, and have been interpreted as due to 'dark objects'...