A5062474610- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Cosmology and Gravitation Theories
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Distributed and Parallel Computing Systems
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Geophysics and Gravity Measurements
- Atomic and Subatomic Physics Research
- Advanced Thermodynamics and Statistical Mechanics
- Age of Information Optimization
- Earth Systems and Cosmic Evolution
- Solar and Space Plasma Dynamics
- Quantum Mechanics and Applications
- Galaxies: Formation, Evolution, Phenomena
- Human Mobility and Location-Based Analysis
- Radiation Detection and Scintillator Technologies
- Radioactive Decay and Measurement Techniques
- Quantum Information and Cryptography
- IoT Networks and Protocols
- Quantum Computing Algorithms and Architecture
- Relativity and Gravitational Theory
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2014-2023
University of Trieste
2014-2023
Johannes Gutenberg University Mainz
2020-2023
Prisma
2021
Proteogenomics Research Institute for Systems Medicine
2021
Protéomique, Réponse Inflammatoire et Spectrométrie de Masse
2021
University of Geneva
2014-2019
Deutsches Elektronen-Synchrotron DESY
2017-2019
University of California, Berkeley
2015
University of Glasgow
2015
This document is the final report of ATLAS-CMS Dark Matter Forum, a forum organized by ATLAS and CMS collaborations with participation experts on theories Matter, to select minimal basis set dark matter simplified models that should support design early LHC Run-2 searches. A prioritized, compact benchmark proposed, accompanied studies parameter space these repository generator implementations. also addresses how apply Effective Field Theory formalism for collider searches present results...
We discuss the limitations to use of effective field theory approach study dark matter at LHC. introduce and a few quantities, some them independent ultraviolet completion theory, which quantify error made when using operators describe processes with very high momentum transfer. Our criteria indicate up what cutoff energy scale, precision, description is valid, depending on mass couplings.
This document a outlines set of simplified models for dark matter and its interactions with Standard Model particles. It is intended to summarize the main characteristics that these have when applied searches at LHC, provide number useful expressions reference. The list includes both s-channel t-channel scenarios. For s-channel, spin-0 spin-1 mediations are discussed, also realizations where Higgs particle provides portal between visible sectors. guiding principles underpinning proposed...
The Standard Model Higgs potential becomes unstable at large field values. After clarifying the issue of gauge dependence effective potential, we study cosmological evolution in presence this instability throughout inflation, reheating and present epoch. We conclude that anti-de Sitter patches which lies its true vacuum are lethal for our universe. From result, derive upper bounds on Hubble constant during depend temperature coupling to scalar curvature or inflaton. Finally how a speculative...
A bstract 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 the possibility that this signal comes from new physics leads to generation of primordial background. We propose set simple but concrete models can serve as benchmarks waves sourced by cosmological phase transitions, domain wall networks, cosmic strings, axion dynamics, or large scalar fluctuations....
We analyze the phase transition in improved holographic QCD to obtain an estimate of gravitational wave signal emitted confinement a pure SU(3) Yang-Mills dark sector. derive effective action from holography and show that energy budget duration can be calculated with minor errors. These are used as input prediction signal. To our knowledge, this is first computation model designated match lattice data on thermal properties Yang-Mills.
We generalize in several directions our recent analysis of the limitations to use effective field theory approach study dark matter at LHC. Firstly, we full list operators connecting fermion DM quarks and gluons, corresponding integrating out a heavy mediator s-channel; secondly, provide analytical results for validity EFT description both √s = 8 TeV 14 TeV; thirdly, make MonteCarlo event generator assess conclusions. apply revisit current collider bounds on ultraviolet cut-off scale show...
We extend our recent analysis of the limitations effective field theory approach to studying dark matter at LHC, by investigating case in which Dirac couples standard model quarks via $t$-channel exchange a heavy scalar mediator. provide analytical results for validity description, both $\sqrt{s}$ = 8 TeV and 14 TeV. make use MonteCarlo event generator assess conclusions. also point out general trend that regions where is valid, relic abundance typically large.
The coupling of an axion-like particle driving inflation to the Standard Model content through a Chern-Simons term generically sources dual production massless helical gauge fields and chiral fermions. We demonstrate that interplay these two components results in highly predictive baryogenesis model, which requires no further ingredients beyond Model. If helicity stored hyper magnetic field effective chemical potential induced by fermion are large enough avoid diffusion from thermal plasma...
A bstract We analyze the constraints from direct and indirect detection on fermionic Majorana Dark Matter (DM). Because interaction with Standard Model (SM) particles is spin-dependent, a priori that one gets neutrino telescopes, LHC, experiments are comparable. study complementarity of these searches in particular example, which heavy Z ′ mediates interactions between SM DM. find for dark matter provides strongest bounds this scenario, while IceCube typically stronger than those detection....
We investigate the production of axion quanta during early universe evolution an axion-like field rolling down a wiggly potential. compute growth quantum fluctuations and their back-reaction on homogeneous zero-mode. evaluate transfer kinetic energy from zero mode to conditions decelerate zero-mode as function Hubble rate, slope potential, size barriers initial velocity. discuss how these effects impact relaxion mechanism.
Many early universe scenarios predict an enhancement of scalar perturbations at scales currently unconstrained by cosmological probes. These source gravitational waves (GWs) second order in perturbation theory, leading to a scalar-induced wave (SIGW) background. The LISA detector, sensitive mHz GWs, will be able constrain curvature new window corresponding $k \in [10^{10}, 10^{14}] \,{\rm Mpc}^{-1}$, difficult probe otherwise. In this work, we forecast the capabilities SIGWs using different...
Previous computations of feebly interacting particle production have encountered issues with unphysical (negative) interaction rates at soft momenta. We address this problem by studying the Axion-Like Particles (ALPs) coupled to $U(1)$-gauge fields, employing full form 1PI-resummed gauge boson propagators. This approach avoids need for matching or subtraction procedures, ensuring physically consistent results. find that ALP rate remains positive across all momentum scales and identify...
We show that the mechanism of cosmological relaxation electroweak scale can take place independently inflation mechanism, thus relieving burdens from original relaxion proposal. What eventually stops (fast-rolling) field during its evolution is production particles whose mass controlled by Higgs vacuum expectation value. first particle does not work for purpose as track minimum potential in regime where get efficiently produced through their coupling to relaxion. then focus on gauge boson...
As the LHC continues to search for new weakly interacting particles, it is important remember that strongly motivated by existence of dark matter. In view a possible positive signal, essential ask whether newly discovered particle can be assigned label "dark matter". Within given set simplified models and modest working assumptions, we reinterpret relic abundance bound as range, compare parameter space yielding correct with projections Run II exclusion regions. Assuming matter within reach...
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 the possibility that this signal comes from new physics leads to generation of primordial background. We propose set simple but concrete models can serve as benchmarks waves sourced by cosmological phase transitions, domain wall networks, cosmic strings, axion dynamics, or large scalar fluctuations. These are then...
We analyze the class of models where a suitable coupling between inflaton field and vector gives rise to scale-invariant perturbations. exploit fact that de Sitter isometry group acts as conformal on three-dimensional Euclidean space for super-Hubble fluctuations in order characterize correlators involving fields.
I review the construction of Simplified Models for Dark Matter searches. After discussing philosophy and some simple examples, turn attention to aspect theoretical consistency implications necessary extensions these models.
We highlight a new connection between the Standard Model hierarchy problem and dark matter sector. The key piece is relaxion field, which besides scanning Higgs mass setting electroweak scale, also constitutes observed abundance of universe. relaxation mechanism realized during inflation, necessary friction provided by particle production. Using this framework we show that phenomenologically viable candidate in keV range.
In implementations of the electroweak scale cosmological relaxation mechanism proposed so far, effect quantum fluctuations homogeneous relaxion field has been ignored. We show that they can grow during classical evolution passing through its many potential barriers. The resulting production particles act as an efficient stopping for relaxion. revisit original proposal and determine under which conditions inflation may no longer be needed a source friction. review alternative mechanisms in...
A bstract We analyze the phenomenon of axion fragmentation when an field rolls over many oscillations a periodic potential. This is particularly relevant for case relaxion, in which provides necessary energy dissipation to stop evolution. compare results linear analysis with ones obtained from classical lattice simulation, finding agreement stopping time zero mode between two within $$ \mathcal{O}(1) <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi> <mml:mfenced>...
Abstract We derive structure formation limits on dark matter (DM) composed of keV-scale axion-like particles (ALPs), produced via freeze-in through the interactions with photons and Standard Model (SM) fermions. employ Lyman-alpha (Ly-α) forest data sets as well observed number Milky Way (MW) subhalos. compare results obtained using Maxwell-Boltzmann quantum statistics for describing SM bath. It should be emphasized that presence logarithmic divergences complicates calculation production...
Recent LHC data show hints of a new resonance in the diphoton distribution at an invariant mass 750 GeV. Interestingly, this particle might be both CP odd and play role portal into dark matter sector. Under these assumptions motivated by fact that requirement SU(2) L invariance automatically implies coupling alleged to ZZ Zγ, we investigate current future constraints coming from indirect searches performed through neutrino telescope IceCube, supplementing them with direct detection...
We analyze the validity of theorems concerning cancellation infrared and collinar divergences in case dark matter freeze-out early universe. In particular, we compute electroweak logarithmic corrections origin to annihilation cross section a particle being neutral component SU(2)L multiplet. The inclusion processes with final state W can modify significantly sections computed only virtual exchange. Our results show that logs is necessary for precise computation relic abundance.
Indirect searches can be used to test dark matter models against expected signals in various channels, particular antiprotons. With antiproton data available soon at higher and energies, it is important the hypothesis alternative astrophysical sources, e.g. econdaries accelerated supernova remnants. We investigate two from different remnant parameters, as forecasted for AMS-02, show that they present a significant degeneracy.