Axiverse cosmology and the energy scale of inflation
ArXiv 1303.3008 (2013)
Abstract:
Ultra-light axions ($m_a\lesssim 10^{-18}$eV), motivated by string theory, can be a powerful probe of the energy scale of inflation. In contrast to heavier axions the isocurvature modes in the ultra-light axions can coexist with observable gravitational waves. Here it is shown that large scale structure constraints severely limit the parameter space for axion mass, density fraction and isocurvature amplitude. It is also shown that radically different CMB observables for the ultra-light axion isocurvature mode additionally reduce this space. The results of a new, accurate and efficient method to calculate this isocurvature power spectrum are presented, and can be used to constrain ultra-light axions and inflation.CPEB1 coordinates alternative 3′-UTR formation with translational regulation
Nature Springer Nature 495:7439 (2013) 121-125
The rise of a tensor instability in Eddington-inspired gravity
(2013)
The rise of a tensor instability in Eddington-inspired gravity
ArXiv 1301.5264 (2013)
Abstract:
In this work an extension to Eddington's gravitational action is analyzed. We consider the tensor perturbations of a FLRW space-time in the Eddington regime in where the tensor mode is linearly unstable deep and the resulting modifications to Einstein regime are quite strong.Transcriptome analyses of primitively eusocial wasps reveal novel insights into the evolution of sociality and the origin of alternative phenotypes
Genome Biology Springer Nature 14:2 (2013) r20