7 papers
-Dwarfs: White Dwarfs probe Quadratically Coupled Scalars
Kai Bartnick, Konstantin Springmann, Stefan Stelzl +1
We study ultralight scalar fields with quadratic couplings to Standard-Model fermions and derive strong constraints from white-dwarf mass-radius data. Such couplings source scalar…
The COSMIC WISPers White Paper: The physics case for Weakly Interacting Slim Particles
Ariel Arza, Deniz Aybas, Shyam Balaji +124
Axions and other very weakly interacting slim particles (WISPs), with masses below 1 GeV, arise naturally in many extensions of the Standard Model of particle physics. In particula…
New ultralight scalar particles and the mass-radius relation of white dwarfs -- the important role of Sirius B
Kai Bartnick, Detlev Koester, Rolf-Peter Kudritzki +3
We present the equation of state for two classes of new ultralight particles, a scalar field coupling to electrons and a light QCD axion field coupling to…
Constraints on light QCD and CP-violating axions from the death line of rotation-powered pulsars
Samuel J. Witte, Andrea Caputo, Stefan Stelzl +3
For axions that couple to nucleons, the presence of dense nuclear matter can displace the axion from its vacuum minimum, sourcing large field gradients around neutron stars (and, m…
A Universal Bound on QCD Axions from Supernovae
Konstantin Springmann, Michael Stadlbauer, Stefan Stelzl +1
We identify a new production channel for QCD axions in supernova environments that contributes to axion emissivity for all models solving the strong CP problem. This channel arises…
The Bearable Inhomogeneity of the Baryon Asymmetry
Hengameh Bagherian, Majid Ekhterachian, Stefan Stelzl
We study the implications of precision measurements of light-element abundances, in combination with the Cosmic Microwave Background, for scenarios of physics beyond the Standard M…