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Gamma Ray Bursts from Baryon Decay in Neutron Stars
Ue-Li Pen, Abraham Loeb, Neil Turok
The standard unbroken electroweak theory is known to erase baryon number. The baryon number symmetry can be restored in the core of a neutron star as its density diverges via gravi…
Effects of Disks on Gravitational Lensing by Spiral Galaxies
Matthias Bartelmann, Abraham Loeb
Gravitational lensing of a quasar by a spiral galaxy should often be accompanied by damped Lyman-alpha absorption and dust extinction due to the intervening gaseous disk. In nearly…
Identifying the Environment and Redshift of GRB Afterglows from the Time-Dependence of Their Absorption Spectra
Rosalba Perna, Abraham Loeb
The discovery of Gamma-Ray Burst (GRB) afterglows revealed a new class of variable sources at optical and radio wavelengths. At present, the environment and precise redshift of the…
Spectral Implications of Variability in GRB Fireballs
Ravi P. Pilla, Abraham Loeb
Cosmological -ray bursts originate from relativistic winds. Temporal fluctuations in the wind velocity can give rise to internal shocks which dissipate a significant fraction of…
Emission Spectra from Internal Shocks in Gamma-Ray-Burst Sources
Ravi Pilla, Abraham Loeb
Unsteady activity of gamma-ray burst sources leads to internal shocks in their emergent relativistic wind. We study the emission spectra from such shocks, assuming that they produc…
Observational Signatures of the First Quasars
Zoltan Haiman, Abraham Loeb
We study the observational signatures of a potential population of low-luminosity quasars at high redshifts in a LambdaCDM cosmology. We derive the evolution of the quasar luminosi…