532 citations · 1.7k across the 53 of their papers we have counts for
55 papers
Perturbative QCD correction to the nonleptonic weak rate in dense quark matter
Matti Heikinheimo, Hanna Lempiäinen, Risto Paatelainen +2
We present the first calculation of the leading perturbative quantum chromodynamics (QCD) correction to the nonleptonic weak flavor-equilibration rate in dense quark matter. The co…
Cosmic ray boosted dark matter with momentum dependent interactions can explain the LZ 248 keV event
Matti Heikinheimo, Niklas Zimmermann
The LZ experiment has recently reported an observation of a single event with characteristics of a nuclear recoil at a high recoil energy of 248 keV, where no background events are…
Anisotropic electron scattering and Migdal effect in semiconductor detectors
Aula Al-Adulrazzaq, Paolo Settembri, Sebastian Sassi +4
Cryogenic semiconductor detectors are widely used in dark matter direct detection. Electronic excitations in these materials can be caused either by direct dark matter electron sca…
Landau-Zener formula and resonant axion conversion in neutron star magnetospheres
Matti Heikinheimo, Topi Sirkiä, Kimmo Tuominen
We investigate the Landau-Zener description of resonant axion-photon conversion in neutron star magnetospheres. We find that this picture often fails for axion conversions to milli…
Fast numerical evaluation of dark matter direct detection event rates
Sebastian Sassi, Aula Al-Adulrazzaq, Matti Heikinheimo +1
The mathematical expression for the dark matter nuclear recoil event rate in a detector consists of a six dimensional integral over the velocity distribution of dark matter in the…
Axion Superradiance in Dipole Magnetic Fields of Pulsars
Topi Sirkiä, Matti Heikinheimo, Kimmo Tuominen
We consider constraints on the axion-photon coupling by superradiance due to a plasma instability in the magnetospheres of millisecond pulsars. We compute the growth rate of a supe…
Spontaneous damage annealing reactions as a possible source of low energy excess in semiconductor detectors
Kai Nordlund, Fanhao Kong, Flyura Djurabekova +4
In semiconductor detectors designed for capturing dark matter particles or neutrinos, when the detection threshold is constantly improved to increasingly low energies, an "excess"…
Probing the dark matter velocity distribution via daily modulation
Matti Heikinheimo, Kai Nordlund, Sebastian Sassi +1
We consider dark matter velocity distributions with an anisotropic component, and analyze how the velocity structure can be probed in a solid state ionization detector with no dire…
Anatomy of real intermediate state-subtraction scheme
Kalle Ala-Mattinen, Matti Heikinheimo, Kimmo Kainulainen +1
We study the origin of the real intermediate state subtraction problem and compare its different solutions. We show that the ambiguity in subtraction schemes arises from the on-she…
Deep-underground dark matter search with a COSINUS detector prototype
The COSINUS Collaboration, G. Angloher, M. R. Bharadwaj +36
Sodium iodide (NaI) based cryogenic scintillating calorimeters using quantum sensors for signal read out have shown promising first results towards a model-independent test of the…
Particle discrimination in a NaI crystal using the COSINUS remote TES design
COSINUS Collaboration, G. Angloher, M. R. Bharadwaj +38
The COSINUS direct dark matter experiment situated at Laboratori Nazionali del Gran Sasso in Italy is set to investigate the nature of the annually modulating signal detected by th…
Gravitational waves from composite Higgs models
Mads T. Frandsen, Matti Heikinheimo, Martin Rosenlyst +2
We study possible strong first-order electroweak phase transitions in Composite Higgs models and we quantify the part of parameter space that can be probed with future gravitationa…
Daily and annual modulation rate of low mass dark matter in silicon detectors
Abolfazl Dinmohammadi, Matti Heikinheimo, Nader Mirabolfathi +4
Low threshold detectors with single-electron excitation sensitivity to nuclear recoil events in solid-state detectors are also sensitive to the crystalline structure of the target…
Vector dark matter in supercooled Higgs portal models
Mads T. Frandsen, Matti Heikinheimo, Mattias E. Thing +2
We consider extensions of the Standard Model by a hidden sector consisting of a gauge field coupled with a scalar field. Assuming the absence of dimensionful parameters in the tree…
Anisotropic ionization threshold and directional sensitivity in solid state DM detectors
Matti Heikinheimo, Sebastian Sassi, Kimmo Tuominen +2
The threshold displacement energy for nuclear recoils depends strongly on the direction of the recoiling nucleus with respect to the crystal lattice. Assuming that similar dependen…
Energy loss due to defect creation in solid state detectors
Matti Heikinheimo, Sebastian Sassi, Kimmo Tuominen +2
The threshold displacement energy in solid state detector materials varies from several eV to ~100 eV. If a stable or long lived defect is created as a result of a nuclear recoil e…
Energy loss in low energy nuclear recoils in dark matter detector materials
Sebastian Sassi, Matti Heikinheimo, Kimmo Tuominen +4
Recent progress in phonon-mediated detectors with eV-scale nuclear recoil energy sensitivity requires an understanding of the effect of the crystalline defects on the energy spectr…
Momentum distributions of cosmic relics: Improved analysis
Kalle Ala-Mattinen, Matti Heikinheimo, Kimmo Kainulainen +1
We solve coupled momentum-dependent Boltzmann equations for the phase space distribution of cosmic relic particles, without resorting to approximations of assuming kinetic equilibr…
Identification of the low energy excess in dark matter searches with crystal defects
Matti Heikinheimo, Sebastian Sassi, Kai Nordlund +2
An excess of events of unknown origin at low energies below 1 keV has been observed in multiple low-threshold dark matter detectors. Depending on the target material, nuclear recoi…
First measurements of remoTES cryogenic calorimeters: easy-to-fabricate particle detectors for a wide choice of target materials
G. Angloher, M. R. Bharadwaj, I. Dafinei +34
Low-temperature calorimeters based on a readout via Transition Edge Sensors (TESs) and operated below mK are well suited for rare event searches with outstanding resolution a…
Simulation-based design study for the passive shielding of the COSINUS dark matter experiment
G. Angloher, I. Dafinei, N. Di Marco +28
The COSINUS (Cryogenic Observatory for SIgnatures seen in Next-generation Underground Searches) experiment aims at the detection of dark matter-induced recoils in sodium iodide (Na…
Solar neutrinos and dark matter detection with diurnal modulation
Sebastian Sassi, Abolfazl Dinmohammadi, Matti Heikinheimo +4
We investigate the diurnal modulation of the event rate for dark matter scattering on solid targets arising from the directionally dependent defect creation threshold energy. In pa…
Pseudo-Goldstone dark matter: gravitational waves and direct-detection blind spots
Tommi Alanne, Nico Benincasa, Matti Heikinheimo +4
Pseudo-Goldstone dark matter is a thermal relic with momentum-suppressed direct-detection cross section. We study the most general model of pseudo-Goldstone dark matter arising fro…
Velocity Dependent Dark Matter Interactions in Single-Electron Resolution Semiconductor Detectors with Directional Sensitivity
Matti Heikinheimo, Kai Nordlund, Kimmo Tuominen +1
We investigate the velocity and recoil momentum dependence of dark matter interactions with ordinary matter. In particular we focus on the single-electron resolution semiconductor…