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A Supernova Brane Scan
We consider a "brane world scenario" recently introduced by Dvali, Gabadadze, and Porrati and subsequently proposed as an alternative to a cosmological constant in explaining the current acceleration
Eddington-inspired Born-Infeld gravity: nuclear physics constraints and the validity of the continuous fluid approximation
In this paper we investigate the classical non-relativistic limit of the Eddington-inspired Born-Infeld theory of gravity. We show that strong bounds on the value of the only additional parameter of
Early universe constraints on a time varying fine structure constant
Higher-dimensional theories have the remarkable feature of predicting a time (and hence redshift) dependence of the `fundamental' four dimensional constants on cosmological timescales. In this paper
Structural glitches near the cores of red giants revealed by oscillations in g-mode period spacings from stellar models
With recent advances in asteroseismology it is now possible to peer into the cores of red giants, potentially providing a way to study processes such as nuclear burning and mixing through their
The physics of the relativistic counter-streaming instability that drives mass inflation inside black holes
If you fall into a real astronomical black hole (choosing a supermassive black hole, to make sure that the tidal forces do not get you first), then you will probably meet your fate not at a central
Looking for a varying a in the cosmic microwave background
We perform a likelihood analysis of the recently released BOOMERanG and MAXIMA data, allowing for the possibility of a time-varying fine-structure constant. We find that in general this data prefers
Alternatives to Quintessence Model Building
We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quintessence models,
New constraints on varying α
Abstract We present a summary of recent constraints on the value of the fine-structure constant at the epoch of decoupling from the recent observations made by the Wilkinson microwave anisotropy
Junctions and spiral patterns in generalized rock-paper-scissors models.
It is shown that spiral patterns with N arms may develop both for odd and even N, in particular in models where a bidirectional predation interaction of equal strength between all species is modified to include one N-cyclic predator-prey rule.
Bouncing Eddington-inspired Born-Infeld cosmologies: An alternative to inflation?
We study the dynamics of a homogeneous and isotropic Friedmann-Robertson-Walker universe in the context of the Eddington-inspired Born-Infeld theory of gravity. We generalize earlier results,