867 citations · 5.8k across the 70 of their papers we have counts for
4 papers · 1 filter
New Early Dark Energy
Florian Niedermann, Martin S. Sloth
New measurements of the expansion rate of the Universe have plunged the standard model of cosmology into a severe crisis. In this letter, we propose a simple resolution to the prob…
Gravitational Absorption Lines
Andrea Palessandro, Martin S. Sloth
We consider the gravitational analogue of Lyman-alpha absorption lines in astronomical spectroscopy. If Einstein gravity with minimally coupled matter is valid up to the Planck sca…
Gravitational Atoms
Niklas G. Nielsen, Andrea Palessandro, Martin S. Sloth
Particles in a yet unexplored dark sector with sufficiently large mass and small gauge coupling may form purely gravitational atoms (quantum gravitational bound states) with a rich…
Early Cosmological Evolution of Primordial Electromagnetic Fields
Takeshi Kobayashi, Martin S. Sloth
It is usually assumed that when Weyl invariance is unbroken in the electromagnetic sector, the energy density of primordial magnetic fields will redshift as radiation. Here we show…