## Search

Now showing items 1-10 of 39

#### Type Ia supernovae tests of fractal bubble universe with no cosmic acceleration

(E-print astro-ph/0504192University of Canterbury. Physics and Astronomy, 2005)

The unexpected dimness of Type Ia supernovae at redshifts z ≲ 1 has over the past
7 years been seen as an indication that the expansion of the universe is accelerating.
A new model cosmology, the “fractal bubble model”, ...

#### Accelerating cosmologies from compactification with a twist

(University of Canterbury. Physics and Astronomy, 2005)

It is demonstrated by explicit solutions of the 4+n–dimensional vacuum Einstein equations that
accelerating cosmologies in the Einstein conformal frame can be obtained by a time–dependent compactification
of string/M–theory, ...

#### Spacetime as a membrane in higher dimensions

(University of Canterbury. Physics and Astronomy, 1987)

By means of a simple model we investigate the possibility that spacetime
is a membrane embedded in higher dimensions. We present cosmological solutions
of d-dimensional Einstein-Maxwell theory which compactify to two ...

#### Cosmic microwave background anisotropies in the timescape cosmology

(University of Canterbury. Physics and Astronomy, 2014)

We analyze the spectrum of cosmic microwave background (CMB) anisotropies in the timescape
cosmology: a potentially viable alternative to homogeneous isotropic cosmologies without dark energy.
We exploit the fact that ...

#### Is there proof that backreaction of inhomogeneities is irrelevant in cosmology?

(University of Canterbury. Physics and Astronomy, 2015)

In a number of papers Green and Wald argue that the standard
FLRW model approximates our Universe extremely well on all scales, except close
to strong field astrophysical objects. In particular, they argue that the ...

#### Direct measurement of diurnal polar motion by ring laser gyroscopes

(University of Canterbury. Physics and Astronomy, 2004)

We report the first direct measurements of the very small effect of forced diurnal polar
motion, successfully observed on three of our large ring lasers, which now measure
the instantaneous direction of Earth’s rotation ...

#### Properties of cosmologies with dynamical pseudo Nambu-Goldstone bosons

(University of Canterbury. Physics and Astronomy, 2001)

We study observational constraints on cosmological models with a quintessence field in the form of
a dynamical pseudo Nambu–Goldstone boson. After reviewing the properties of the solutions, from
a dynamical systems phase ...

#### Quasilocal energy and thermodynamic equilibrium conditions

(University of Canterbury. Physics and Astronomy, 2015)

Equilibrium thermodynamic laws are typically applied to horizons in
general relativity without stating the conditions that bring them into equilibrium.
We fill this gap by applying a new thermodynamic interpretation to ...

#### Stable gravastars - an alternative to black holes?

(University of Canterbury. Physics and Astronomy, 2004)

The “gravastar” picture developed by Mazur and Mottola is one of a very
small number of serious challenges to our usual conception of a “black hole”. In the
gravastar picture there is effectively a phase transition at
/ ...

#### Dark energy from cosmic structure

(University of Canterbury. Physics and Astronomy, 2014)