Cosmological models in two spacetime dimensions

Gravitational kinks in two spacetime dimensions

The properties of gravitational kinks are studied within some simple models of two dimensional gravity. In spacetimes of cylindrical topology we prove the existence of kinks of constant curvature with arbitrary kink numbers. In R R spacetimes m = 1 kink solutions of the equation R = 0 are found, whereas jmj > 1 at kinks are proved not to exist. We give a detailed analysis of the behaviour of gr...

0 Gravity in Two Spacetime Dimensions

The Cosmological Spacetime

We present here the transformations required to recast the Robertson-Walker metric and Friedmann-Robertson-Walker equations in terms of observer-dependent coordinates for several commonly assumed cosmologies. The overriding motivation is the derivation of explicit expressions for the radius R h of our cosmic horizon in terms of measurable quantities for each of the cases we consider. We show th...

Classical Physics of Thermal Scalar Radiation in Two Spacetime Dimensions

Abstract Thermal scalar radiation in two spacetime dimensions is treated within relativistic classical physics. Part I involves an inertial frame where are given the analogues both of Boltzmann’s derivation of the Stefan-Boltzmann law and also Wien’s derivation of the displacement theorem using the σltU−1-scaling of relativistic radiation theory. Next the spectrum of classical scalar zeropoint ...

Spacetime anisotropy affects cosmological entanglement

Most existing cosmological entanglement studies are focused on the isotropic Robertson-Walker (RW) spacetime. Here we go beyond this limitation and study the influence of anisotropy on entanglement generated by dynamical spacetime. Since the isotropic spacetime is viewed as a background medium and the anisotropy is incorporated as perturbation, we decompose entanglement entropy into isotropic a...