190 citations · 900 across the 33 of their papers we have counts for
34 papers
Report on the Advanced Linear Collider Study Group (ALEGRO) Workshop 2026
L. Verra, P. Muggli, B. Cross +56
The 7th ALEGRO workshop, hosted by INFN Frascati National Laboratories from 3rd to 5th March 2026, brought together the international Advanced Novel Accelerators (ANA) community to…
Vector Resonances at Muon and Wakefield Colliders
Massimo Cipressi, Kevin Langhoff, Toby Opferkuch
We explore the potential of future high-energy lepton colliders to probe heavy vector resonances. At wakefield colliders, intense beam-beam interactions produce radiation, called b…
The art of simulating the early Universe. Part II. Non-canonical cases & gravitational waves
Jorge Baeza-Ballesteros, Daniel G. Figueroa, Adrien Florio +7
We present a discussion on lattice techniques for the simulation of non-canonical field theory circumstances, complementing our previous monograph (arXiv:2006.15122) on canonical c…
Searches for electroweak states at future plasma wakefield colliders
So Chigusa, Simon Knapen, Toby Opferkuch +3
We quantify the discovery potential of future multi-TeV plasma wakefield colliders for new electroweak multiplets. We include beam-beam effects through realistic luminosity spectra…
Displaced Searches for Axion-Like Particles and Heavy Neutral Leptons at Mu3e
Simon Knapen, Toby Opferkuch, Diego Redigolo +1
We present strategies for the Mu3e experiment to search for light, weakly coupled particles produced in rare muon decays, focusing on displaced decays within the hollow ta…
Ricci Reheating on the Lattice
Daniel G. Figueroa, Toby Opferkuch, Ben A. Stefanek
We study the dynamics of a non-minimally coupled (NMC) scalar spectator field in non-oscillatory inflationary scenarios, where there is a transition from inflation to kination domi…
Electron and Muon Dynamics in Neutron Stars Beyond Chemical Equilibrium
Joachim Kopp, Toby Opferkuch
A neutron star harbors of order electrons in its core, and almost the same number of muons, with muon decay prohibited by Pauli blocking. However, as macroscopic properti…
A Robust Search for Lepton Flavour Violating Axions at Mu3e
Simon Knapen, Kevin Langhoff, Toby Opferkuch +1
We propose a search at Mu3e for lepton flavor violating axion(-like) particles in decays. By requiring an additional pair from internal conversion, one can c…
Angling for Insights: Illuminating Light New Physics at Mu3e through Angular Correlations
Simon Knapen, Kevin Langhoff, Toby Opferkuch +1
We examine the capability of Mu3e to probe light new physics scenarios that produce a prompt electron-positron resonance and demonstrate how angular observables are instrumental in…
Magnetic Moments of Astrophysical Neutrinos
Joachim Kopp, Toby Opferkuch, Edward Wang
We study the impact of neutrino magnetic moments on astrophysical neutrinos, in particular supernova neutrinos and ultra-high energy neutrinos from extragalactic sources. We show t…
The Supercooling Window at Weak and Strong Coupling
Noam Levi, Toby Opferkuch, Diego Redigolo
Supercooled first order phase transitions are typical of theories where conformal symmetry is predominantly spontaneously broken. In these theories the fate of the flat scalar dire…
Lepton PDFs and Multipurpose Single Lepton Searches at the LHC
Herbi K. Dreiner, Victor Martin Lozano, Saurabh Nangia +1
A final state consisting of one charged lepton, at least one jet, and little missing transverse energy can be a very promising signature of new physics at the LHC across a wide ran…
Dynamics of Non-minimally Coupled Scalar Fields in the Jordan Frame
Daniel G. Figueroa, Adrien Florio, Toby Opferkuch +1
The presence of scalar fields with non-minimal gravitational interactions of the form may have important implications for the physics of the early universe. While many s…
The Neutrino Magnetic Moment Portal
Vedran Brdar, Admir Greljo, Joachim Kopp +1
We discuss neutrino magnetic moments as a way of constraining physics beyond the Standard Model. In fact, new physics at the TeV scale can easily generate observable neutrino magne…
Dark Matter, Destroyer of Worlds: Neutrino, Thermal, and Existential Signatures from Black Holes in the Sun and Earth
Javier F. Acevedo, Joseph Bramante, Alan Goodman +2
Dark matter can be captured by celestial objects and accumulate at their centers, forming a core of dark matter that can collapse to a small black hole, provided that the annihilat…
The Neutrino Magnetic Moment Portal: Cosmology, Astrophysics, and Direct Detection
Vedran Brdar, Admir Greljo, Joachim Kopp +1
We revisit the physics of neutrino magnetic moments, focusing in particular on the case where the right-handed, or sterile, neutrinos are heavier (up to several MeV) than the left-…
Gravitational Imprints of Flavor Hierarchies
Admir Greljo, Toby Opferkuch, Ben A. Stefanek
The mass hierarchy among the three generations of quarks and charged leptons is one of the greatest mysteries in particle physics. In various flavor models, the origin of this phen…
Probing muonic forces with neutron star binaries
Jeff A. Dror, Ranjan Laha, Toby Opferkuch
We show that gravitational wave emission from neutron star binaries can be used to discover any generic long-ranged muonic force due to the large inevitable abundance of muons insi…
Gravitational wave probes of dark matter: challenges and opportunities
Gianfranco Bertone, Djuna Croon, Mustafa A. Amin +9
In this white paper, we discuss the prospects for characterizing and identifying dark matter using gravitational waves, covering a wide range of dark matter candidate types and sig…
Ricci Reheating
Toby Opferkuch, Pedro Schwaller, Ben A. Stefanek
We present a model for viable gravitational reheating involving a scalar field directly coupled to the Ricci curvature scalar. Crucial to the model is a period of kination after in…
Dark, Cold, and Noisy: Constraining Secluded Hidden Sectors with Gravitational Waves
Moritz Breitbach, Joachim Kopp, Eric Madge +2
We explore gravitational wave signals arising from first-order phase transitions occurring in a secluded hidden sector, allowing for the possibility that the hidden sector may have…
The Ultraviolet Landscape of Two-Higgs Doublet Models
Manuel E. Krauss, Toby Opferkuch, Florian Staub
We study the predictions of generic ultraviolet completions of two-Higgs doublet models. We assume that at the matching scale between the two-Higgs doublet model and a ultraviolet…
Cuckoo's Eggs in Neutron Stars: Can LIGO Hear Chirps from the Dark Sector?
Joachim Kopp, Ranjan Laha, Toby Opferkuch +1
We explore in detail the possibility that gravitational wave signals from binary inspirals are affected by a new force that couples only to dark matter particles. We discuss the im…
N-loop running should be combined with N-loop matching
Johannes Braathen, Mark D. Goodsell, Manuel E. Krauss +2
We investigate the high-scale behaviour of Higgs sectors beyond the Standard Model, pointing out that the proper matching of the quartic couplings before applying the renormalisati…