Prediction and control of the dynamics of complex networks is a central problem in network science. Structural and dynamical similarities of different real networks suggest that some universal laws might accurately describe the dynamics of these networks, albeit the nature and common origin of such laws remain elusive. Here we show that the causal network representing the large-scale structure ...

Cosmology is the dot com of the sciences. Boom or bust. It is about nothing less than the origin and evolution of the Universe, the all of everything. It is the boldest of enterprises and not for the fainthearted. Cosmologists are the flyboys of astrophysics, and they often live up to all that image conjures up. It is hardly surprising then that words written about cosmology are rarely balanced...

The neutrino flux from the sun is estimated within the framework of the fractal universe with a power index of 2. The obtained value of the neutrino flux may provide a solution for the solar neutrino puzzle. As known [1], [2] experiments measured solar neutrino fluxes significantly smaller than those predicted by the standard solar model (SSM) [3], [4]. Discrepancy between the theoretical and e...

We recently studied the formation and evaporation of primordial black holes in a simple braneworld cosmology, namely the Randall-Sundrum type II cosmology. Here we study the effect of accretion from the cosmological background onto the black holes after formation. While it is generally believed that in the standard cosmology such accretion is of negligible importance, we find that during the hi...

Recently, a singularity theorem for full SD-brane spacetimes was given in hepth/0305055. We comment on the relation between this and previous work as well as provide a more geometric formulation interpreted as a no-go theorem. We then point out that some setups of physical interest escape the theorem: cosmological applications, half-SDp-branes and decaying unstable Dp-branes for general p. We a...

We solve for the behaviour of cosmological perturbations in the Dvali-Gabadadze-Porrati (DGP) braneworld model using a new numerical method. Unlike some other approaches in the literature, our method uses no approximations other than linear theory and is valid on large scales. We examine the behaviour of late-universe density perturbations for both the self-accelerating and normal branches of D...

We review scenarios that have been proposed to solve the cosmological problem caused by moduli in string theory, the Postmodern Polonyi Problem (PPP). In particular, we discuss the difficulties encountered by the apparently " trivial " solution of this problem, in which moduli masses are assumed to arise from nonperturbative, SUSY preserving, dynamics at a scale higher than that of SUSY breakin...

We describe a cosmology of the very early universe, based on the holo-graphic principle of 't Hooft and Susskind. We have described the initial state as a dense black hole fluid. Here we present a mathematical model of this heuristic picture, as well as a non-rigorous discussion of how a more normal universe could evolve out of such a state. The gross features of the cosmology depend on a few p...

The Strong CP Problem and its resolution through the existence of an axion are briefly reviewed. The combined constraints from accelerator searches, the evolution of red giants and the duration of the SN 1987a neutrino pulse require the axion mass ma to be less than 3 · 10−3 eV. On the other hand, the requirement that the axion does not overclose the universe implies a lower bound on ma of orde...