116 citations · 351 across the 9 of their papers we have counts for
9 papers
Domain Walls From Confining Bubbles: Yang Mills at Finite
Bruno Missoni, Enrico Morgante, Nicklas Ramberg
We study the confinement phase transition in SU() pure Yang-Mills theory at finite using the Improved Holographic QCD (IHQCD) model. We show that the critical temp…
Trapped and Unstable: Axion-like particle fragmentation at finite temperature
Nicklas Ramberg, Daniel Schmitt
We investigate the emergence of a resonant behavior in axion-trapped misalignment models featuring finite-temperature potential barriers. As the temperature decreases and the field…
Thermodynamical uncertainties for primordial black holes from cosmological phase transitions
Maciej Kierkla, Nicklas Ramberg, Philipp Schicho +1
Strongly supercooled first-order phase transitions have been proposed as a primordial black hole (PBH) production mechanism. While previous works rely on simplified models with lim…
Primordial gravitational waves in the nano-Hertz regime and PTA data -- towards solving the GW inverse problem
Eric Madge, Enrico Morgante, Cristina Puchades-Ibáñez +4
In recent years, several pulsar timing array collaborations have reported first hints for a stochastic gravitational wave background at nano-Hertz frequencies. Here we elaborate on…
Echo of the Dark: gravitational waves from dark SU(3) Yang-Mills theory
Enrico Morgante, Nicklas Ramberg, Pedro Schwaller
We analyze the phase transition in improved holographic QCD to obtain an estimate of the gravitational wave signal emitted in the confinement transition of a pure SU(3) Yang-Mills…
One to rule them all: CMB spectral distortions can probe domain walls, cosmic strings and low scale phase transitions
Nicklas Ramberg, Wolfram Ratzinger, Pedro Schwaller
We present a new probe of purely gravitationally coupled sectors with large anisotropies. These anisotropies are damped via gravitational interactions with the baryon-photon fluid,…
QCD Axion Kinetic Misalignment without Prejudice
Basabendu Barman, Nicolás Bernal, Nicklas Ramberg +1
The axion field, the angular direction of the complex scalar field associated with the spontaneous symmetry breaking of the Peccei-Quinn (PQ) symmetry, could have originated with i…
The QCD Axion and Gravitational Waves in light of NANOGrav results
Nicklas Ramberg, Luca Visinelli
The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration has recently reported strong evidence for a stochastic process affecting the 12.5 yr datas…
Probing the Early Universe with Axion Physics and Gravitational Waves
Nicklas Ramberg, Luca Visinelli
We show results for the expected reach of the network of experiments that is being set up globally with the aim of detecting the "invisible" axion, in light of a non-standard therm…