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N Turok

Publications and source records attributed to N Turok.

At least 19 recordsLinked to original sources
PubMed2001

Constraining isocurvature perturbations with cosmic microwave background polarization.

The role of cosmic microwave background polarization data in constraining the presence of primordial isocurvature modes is examined. While MAP will be unable to simultaneously constrain isocurvature modes and cosmological parameters, PLANCK will set strong limits on isocurvature modes. If one allows isocurvature modes, the recently obtained BOOMERANG measurement of the curvature of the Universe fails. However, a comparably sensitive polarization measurement on the same angular scales will permit a determination of the curvature without the prior assumption of adiabaticity.

Journal Article↗
PubMed2001

Inflation and the Beginning of the Universe.

The question of whether there was a Beginning of the Universe is a truly challenging puzzle for physics and for philosophy. Classical general relativity implies that our observable universe originated in a singularity fifteen billion years ago, but this may be merely a reflection of the incompleteness of the theory. Inflationary theory and quantum cosmology provide our best current attempt to describe these early moments. It has been claimed that the inflationary mechanism renders moot the question of exactly how the universe began. I argue that, on the contrary, if one asks the question of what was in the past, we find ourselves staring directly back at a putative Beginning after all.

Extraterrestrial Environment↗