Hydrogen "snow clouds" - which are so cold and dense that they contain particles of solid or liquid molecular hydrogen - are a well motivated form of baryonic dark matter. Theoretical models of snow cloud structure prefer cloud masses in the planetary range, but radii as large as planetary orbits. Increasingly there is evidence that such gas plays an important role in our own Galaxy, but the...
Combining Geometric Algebra with tetrads is an excellent tool to describe the geometric character of General Relativity. In this talk, I will briefly introduce the formalism and illustrate its potential by presenting the calculations of an orbital precision around a Schwarzschild black hole. Compared with tensor calculus, **we reduce a system of 4 coupled differential equations to a single,...
There is currently no evidence for a baryon asymmetry in our Universe. Instead, cosmological observations have only demonstrated the existence of a quark-antiquark asymmetry, which does not necessarily imply a baryon asymmetric Universe, since the baryon number of the dark sector particles is unknown. In this paper we discuss a framework where the total baryon number of the Universe is equal...
Minimally modified gravity models are a class of modified gravity theories with only two local degrees of freedom as in General Relativity. I want to discuss the implications on the early Universe.
As long as the non-dynamical scalar field is sub-dominant at the background one recovers the standard results for slow-roll inflation both for the power and biscpectrum. Otherwise, it is possible...
