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15 papers · 2 filters
Steady-state structure of relativistic collisionless shocks
David Medvigy, Abraham Loeb
We explore analytically the structure of relativistic shock and solitary wave solutions in collisionless plasmas. In the wave frame of reference, a cold plasma is flowing from one…
What is the Highest Plausible Redshift of Luminous Quasars?
Zoltan Haiman, Abraham Loeb
The recent discoveries of luminous quasars at high redshifts imply that black holes more massive than a few billion solar masses have been assembled already when the universe was l…
Gravitational Microlensing of Gamma-Ray Burst Afterglows by Single and Binary Stars
Shude Mao, Abraham Loeb
We calculate the magnification light curves due to stellar microlensing of gamma-ray burst (GRB) afterglows. A GRB source appears on the sky as a thin ring which expands faster tha…
The Reionization of the Universe by the First Stars and Quasars
Abraham Loeb, Rennan Barkana
The first light from stars and quasars ended the ``dark ages'' of the universe and led to the reionization of hydrogen by redshift 7. Current observations are at the threshold of p…
Does the Mass Accretion Rate Depend On the Radius of the Accreting Star?
Abraham Loeb, Ramesh Narayan, John Raymond
In some circumstances, the mass accretion rate M^dot onto a compact star may depend not only on external boundary conditions, but also on the radius R of the star. Writing the depe…
In the Beginning: The First Sources of Light and the Reionization of the Universe
Rennan Barkana, Abraham Loeb
The formation of the first stars and quasars marks the transformation of the universe from its smooth initial state to its clumpy current state. In popular cosmological models, the…