1. Gamma-ray bursts prompt emission spectrum: an analysis of a photosphere model.

    Philosophical Transactions of the Royal Society... 365(1854):1171 (2007) PMID 17293325

    A thermal radiative component is likely to accompany the first stages of the prompt emission of gamma-ray bursts (GRBs) and X-ray flashes. We analyse the effect of such a component on the observable spectrum, assuming that the observable effects are due to a dissipation process occurring below o...
  2. Introduction: recent developments in the study of gamma-ray bursts.

    Philosophical Transactions of the Royal Society... 365(1854):1111 (2007) PMID 17293313

    Gamma-ray bursts (GRBs) are immensely powerful explosions, originating at cosmological distances, whose outbursts persist for durations ranging from milliseconds to tens of seconds or more. In these brief moments, the explosions radiate more energy than the Sun will release in its entire 10Gyr l...
  3. Cosmology. Anthropic reasoning.

    Science 309(5737):1022 (2005) PMID 16099967

  4. Introduction.

    Philosophical Transactions of the Royal Society... 361(1812):2427 (2003) PMID 14667310

    It is embarrassing that 95% of the Universe is unaccounted for. Galaxies and larger-scale cosmic structures are composed mainly of "dark matter", whose nature is still unknown. Favoured candidates are weakly interacting particles that have survived from the very early Universe, but more exotic o...
  5. Cosmology. How the cosmic dark age ended.

    Science 295(5552):51 (2002) PMID 11778028

  6. Feeding black holes at galactic centres by capture from isothermal cusps

    New Astronomy 7(7):385 (2002)

    The capture rates of stars and dark particles onto supermassive black holes depend strongly on the spatial and kinematical distribution of the stellar and dark matter at the centre of bulges and elliptical galaxies. We here explore the possibility that all ellipticals/bulges have initially ...
  7. ‘First light’ in the universe: what ended the ‘dark age’?

    Physics Reports 333:203 (2000)

    The universe would have been completely dark between the epoch of recombination and the development of the first non-linear structure. But at redshifts beyond 5 – perhaps even beyond 20 – stars formed within ‘subgalaxies’ and created the first heavy elements; these same systems (together pe...