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we extend the dirac scotogenic model with the aim of realizing neutrino masses together with the mass of a kev-scale dark matter (dm) candidate via the same one-loop topology. two of the standard model (sm) neutrinos become massive dirac fermions while the third one remains massless. our particle content is motivated b... | freeze-in of radiative kev-scale neutrino dark matter from a new u(1)b-l |
weakly interacting massive particles, as a major candidate of dark matter (dm), may directly annihilate or decay into high-energy photons, producing monochromatic spectral lines in the gamma-ray band. these spectral lines, if detected, are smoking-gun signatures for the existence of new physics. using the 5 years of da... | search for the gamma-ray spectral lines with the dampe and the fermi-lat observations |
we consider a scenario in which the dark matter is alone in a hidden sector and consists of a real scalar particle with a manifest or spontaneously broken &z;2 symmetry, at a temperature which differs from the one of the visible sector, t' ≠ t. while similar models with general couplings have already been studied in th... | the domain of a cannibal dark matter |
in spontaneously broken gauge theories, transition amplitudes describing dark-matter (dm) annihilation processes through a resonance may become highly inaccurate close to a production threshold, if a breit-wigner (bw) ansatz with a constant width is used. to partially overcome this problem, the bw propagator needs to b... | gauge-independent approach to resonant dark matter annihilation |
in the past few decades, many studies have analyzed the data of gamma-rays, x-rays, radio waves, electrons, positrons, anti-protons, and neutrinos to search for the signal of dark matter annihilation. in particular, analyzing radio data has been one of the most important and effective ways to constrain dark matter. in ... | radio constraints of dark matter: a review and some future perspectives |
we propose a theory of chiral fermion dark matter (dm) with an isospin-3 /2 fermion of a dark sector s u (2 )d gauge symmetry, which is arguably the simplest chiral theory. an isospin-3 scalar breaks s u (2 )d down to a discrete non-abelian group t′ and generates the dm mass. the s u (2 )d gauge symmetry protects the d... | simple theory of chiral fermion dark matter |
dark matter (dm) is added to the froggatt-nielsen (fn) mechanism, and conditions for its successful freeze-out identified. requesting the fn scale λfn to be the cutoff of the theory renders freeze-out scenarios surprisingly few. fermionic dm is typically charged under u (1 )fn, with the dominant annihilation channel a ... | thermal dark matter via the flavon portal |
we analyze the angular power spectrum (aps) of the unresolved gamma-ray background (ugrb) emission and combine it with the measured properties of the resolved gamma-ray sources of the fermi-lat 4fgl catalog. our goals are to dissect the composition of the gamma-ray sky and to establish the relevance of different classe... | flat-spectrum radio quasars and bl lacs dominate the anisotropy of the unresolved gamma-ray background |
we consider dark matter which has nonzero electromagnetic form factors like electric/magnetic dipole moments and anapole moment for fermionic dark matter and rayleigh form factor for scalar dark matter. we consider dark matter mass mχ>o (mev ) and put constraints on their mass and electromagnetic couplings from cosm... | constraints on electromagnetic form factors of sub-gev dark matter from the cosmic microwave background anisotropy |
recent observational studies of γ-ray emission from massive globular clusters (gcs) have revealed possible evidence of dark matter (dm) annihilation within gcs. it is, however, still controversial whether the emission comes from dm or from millisecond pulsars. we here present the new results of numerical simulations, w... | formation of massive globular clusters with dark matter and its implication on dark matter annihilation |
assuming that the underlying model satisfies some general requirements such as renormalizability and cp conservation, we calculate the non-relativistic one-loop cross section for any self-conjugate dark matter particle annihilating into two photons. we accomplish this by carefully classifying all possible one-loop diag... | general calculation of the cross section for dark matter annihilations into two photons |
this project proposes to reuse the dafne accelerator complex for producing a high intensity (up to 10^10), high-quality beam of high-energy (up to 500 mev) positrons for hep experiments, mainly - but not only - motivated by light dark particles searches. such a facility would provide a unique source of ultra-relativist... | poseydon - converting the dafne collider into a double positron facility: a high duty-cycle pulse stretcher and a storage ring |
we perform a comprehensive analysis for the light scalar dark matter (dm)in the inert two higgs doublet model (i2hdm) with compressed mass spectra, small mass splittings among three $\mathbb{z}_2$ odd particles---scalar $s$, pseudo-scalar $a$, and charged higgs $h^\pm$. in such a case, the co-annihilation processes pla... | confronting dark matter co-annihilation of inert two higgs doublet model with a compressed mass spectrum |
in this work, we search for γ -ray emission from nearby milky way dwarf spheroidal galaxies (dsphs) and candidates with the publicly available pass 8 data of fermi-lat. our sample includes 12 sources with the distances <50 kpc . very weak γ -ray excesses (∼2 σ ) are found in some dsphs/candidates, consistent with th... | search for gamma-ray emission from the nearby dwarf spheroidal galaxies with 9 years of fermi-lat data |
it is shown that a decaying neutralino in a supergravity unified framework is a viable candidate for dark matter. such a situation arises in the presence of a hidden sector with ultraweak couplings to the visible sector where the neutralino can decay into the hidden sector's lightest supersymmetric particle (lsp) with ... | a decaying neutralino as dark matter and its gamma ray spectrum |
gamma-rays induced by annihilation or decay of dark matter can be its smoking gun signature. in particular, gamma-rays generated by internal bremsstrahlung of majorana and real scalar dark matter is promising since it can be a leading emission of sharp gamma-rays. however in the case of majorana dark matter, its cross ... | effect of degenerate particles on internal bremsstrahlung of majorana dark matter |
in some models of thermal relic dark matter, the relic abundance may be set by inelastic scattering processes (rather than annihilations) becoming inefficient as the universe cools down. this effect has been called coscattering. we present a procedure to numerically solve the full momentum-dependent boltzmann equations... | coscattering in next-to-minimal dark matter and split supersymmetry |
dark matter (dm) self-interactions affect the gravitational capture of dm in the sun and earth differently as a simple consequence of the differing kinematics of collisions within the two potential wells: the dominant effect of self-interactions in the sun is to provide an additional channel for capture, while the domi... | a solar system test of self-interacting dark matter |
the milky way's galactic center harbors a gamma-ray excess that is a candidate signal of annihilating dark matter. dwarf galaxies remain predominantly dark in their expected commensurate emission. in this work we quantify the degree of consistency between these two observations through a joint likelihood analysis. in d... | what the milky way's dwarfs tell us about the galactic center extended gamma-ray excess |
we propose that the nature of indirect signals of dark matter (dm) can depend on the galactic environment they originate from. we demonstrate this possibility in models where dm annihilates into light mediators whose branching fractions depend on a long-range force sourced by ordinary matter. in particular, electromagn... | indirect signals of dark matter can change depending on where you look |
if the annihilation products of dark matter (dm) are non-relativistic and if there is some long-range force between them, there can be sommerfeld effect for the final state particles. we study this effect on dm relic abundance in the thermal freeze-out scenario. as a proof of concept, we consider the case of a dm pair ... | final state sommerfeld effect on dark matter relic abundance |
the asymmetric dark matter (adm) scenario can solve the coincidence problem between the baryon and the dark matter (dm) abundance when the dm mass is of o (1) gev. in the adm scenarios, composite dark matter is particularly motivated, as it can naturally provide the dm mass in the o (1) gev range and a large annihilati... | oscillating composite asymmetric dark matter |
high-energetic gamma rays from astrophysical targets constitute a unique probe for annihilation or decay of heavy particle dark matter (dm). after several decades, diverse null detections have resulted in strong constraints for dm particle masses up to the tev scale. while the gamma-ray signature is expected to be univ... | tev dark matter searches in the extragalactic gamma-ray sky |
we consider the angular distribution of the photon signal which could arise from velocity-dependent dark matter annihilation within the galactic bulge. we find that, for the case of sommerfeld-enhanced annihilation, dark matter annihilation within the bulge is dominated by slow speed particles which never leave the bul... | the velocity-dependent j-factor of the milky way halo: does what happens in the galactic bulge stay in the galactic bulge? |
the quark nugget (qn) model of dark matter suggests that the dark matter may consist of compact composite objects of quark matter. although such composite particles can strongly interact with visible matter, they may remain undetected because of a small cross section to mass ratio. we focus on anti-qns made of antiquar... | thermal and annihilation radiation in the quark nugget model of dark matter |
we consider models with fermionic dark matter that transforms under a non-abelian dark gauge group. exotic, vectorlike leptons that also transform under the dark gauge group can mix with standard model leptons after spontaneous symmetry breaking and serve as a portal between the dark and visible sectors. we show in an ... | dark sector portal with vectorlike leptons and flavor sequestering |
we study natural supersymmetric scenarios with light right-handed neutrino superfields, and consider the possibility of having either a neutrino or a sneutrino as a dark matter candidate. for the former, we evaluate the possibility of having susy corrections on the ν4→νℓγ decay rate, such that the nustar bounds are rel... | revisiting neutrino and sneutrino dark matter in natural susy scenarios |
a package for the simulation of dark matter (dm) particles is presented. it is intended for fixed target experiments. we chose the geant4 toolkit framework as a standard in order to be compatible with particle tracking programs used in many high energy physics (hep) experiments. one part of the package is a collection ... | fully geant4 compatible package for the simulation of dark matter in fixed target experiments |
the dark matter particle explorer (dampe) recently reported an excess of electrons/positrons above expected background fluxes even when a double power-law background spectrum is assumed. several dark matter models that involve tev-scale leptophilic wimps have been suggested in the literature to account for this excess.... | dark matter gets dampe |
the possibility of explaining the positron anomaly on the basis of models involving the darkmatter annihilation or decay is being widely discussed at the present time. however, such models are severely constrained by data on cosmic gamma radiation. two different procedures that rely on the χ2 criterion and which permit... | analysis of a possible explanation of the positron anomaly in terms of dark matter |
i calculate the rate of wimp capture and annihilation in the earth in the non-relativistic effective theory of dark matter-nucleon interactions. neglecting operator interference, i consider all galilean invariant interaction operators that can arise from the exchange of a heavy particle of spin less than or equal to on... | wimp capture and annihilation in the earth in effective theories |
we study two models of scalar dark matter from "large" electroweak multiplets with isospin 5 /2 (n =6 members) and 7 /2 (n =8 ), whose scalar potentials preserve a z2 symmetry. because of large annihilation cross sections due to electroweak interactions, these scalars can constitute all the dark matter only for masses ... | large scalar multiplet dark matter in the high-mass region |
in this talk, we discuss the physics modelling of particle spectra arising from dark matter (dm) annihilation or decay. in the context of the indirect searches of dm, the final state products will, in general, undergo a set of complicated processes such as resonance decays, qed/qcd radiation, hadronisation and hadron d... | particle spectra from dark matter annihilation: physics modeling and qcd uncertainties |
in the scenario where the dark matter (dm) particles χbar chi pair annihilate through a resonance particle r, the constraint from dm relic density makes the corresponding cross section for dm-nuclei elastic scattering extremely small, and can be below the neutrino background induced by the coherent neutrino-nuclei scat... | direct detection of dark matter with resonant annihilation |
in the past decade, gamma-ray observations and radio observations of our milky way and the milky way dwarf spheroidal satellite galaxies put very strong constraints on annihilation cross sections of dark matter. in this paper, we suggest a new target object (ngc 2976) that can be used for constraining annihilating dark... | a new target object for constraining annihilating dark matter |
annihilation of dark matter (dm) particles has been recognized as one of the possible mechanisms for the production of non-thermal particles and radiation in galaxy clusters. previous studies have shown that, while dm models can reproduce the spectral properties of the radio halo in the coma cluster, they fail in repro... | the role of dark matter sub-halos in the non-thermal emission of galaxy clusters |
models in which the dark matter is produced at extremely low rates from the annihilation of standard model particles in the early universe allow us to explain the current dark matter relic density while easily evading the traditional experimental constraints. in scenarios where the dark matter interacts with the standa... | dark matter amnesia in out-of-equilibrium scenarios |
in the absence of a clear hint of dark matter (dm) signals in the gev regime so far, heavy, script o(tev) dm candidates are gradually earning more and more attention within the community. among others, extra-dimensional brane-world models may produce thermal dm candidates with masses up to 100 tev . these heavy dm cand... | cherenkov telescope array sensitivity to branon dark matter models |
dark matter (dm) annihilation or decay can affect the anisotropy of the cosmic microwave background (cmb). therefore, the cmb data can be used to constrain the properties of a dark matter particle. in this work, we use the new cmb data obtained by the planck satellite to investigate the limits on the basic parameters o... | constraints on the basic parameters of dark matter using the planck data |
annihilating dark matter particles in nearby subhalos could generate potentially observable fluxes of gamma rays, unaccompanied by emission at other wavelengths. furthermore, this gamma-ray emission is expected to be spatially extended, providing us with a powerful way to discriminate dark matter subhalos from other as... | resolving dark matter subhalos with future sub-gev gamma-ray telescopes |
we investigate the cosmological stability of light bosonic dark matter carrying a tiny electric charge. in the wavelike regime of high occupation numbers, annihilation into gauge bosons can be drastically enhanced by parametric resonance. the millicharged particle can either be minimally coupled to photons, or its elec... | challenging the stability of light millicharged dark matter |
with 91 months of the publicly available fermi lat pass 8 data, we analyze the gamma-ray emission from the milky way satellites to search for potential line signals due to the annihilation of dark matter particles into double photons. the searched targets include a sample of dwarf spheroidal galaxies, the large magella... | search for gamma-ray line features from milky way satellites with fermi lat pass 8 data |
we study how the kinetic decoupling of dark matter within a minimal supersymmetric extension of the standard model, by adopting nine independent parameters (mssm-9), could improve our knowledge of the properties of the dark matter protohalos. we show that the most probable neutralino mass regions, which satisfy the rel... | dark matter protohalos in a nine parameter mssm and implications for direct and indirect detection |
we construct a generic model of majorana fermionic dark matter (dm). starting with two weyl spinor multiplets η1 ,2∼(i ,∓y ) coupled to the standard model higgs, six additional weyl spinor multiplets with (i ±1 /2 ,±(y ±1 /2 )) are needed in general. it has 13 parameters in total, five mass parameters and eight yukawa ... | study of majorana fermionic dark matter |
we present a new search for weakly interacting massive particles utilizing ten years of public icecube data, setting more stringent bounds than previous icecube analysis on massive dark matter to neutrino annihilation. we also predict the future potential of the new neutrino observatory, p-one, showing that it may even... | searching for dark matter annihilation with icecube and p-one |
we study a model of neutrino and dark matter within the framework of a minimal extended seesaw. this model is based on $a_4$ flavour symmetry along with the discrete $z_3\times z_4$ symmetry to stabilize the dark matter and construct desired mass matrices for neutrino mass. five-zero textures are imposed in the final $... | five-zero texture in neutrino-dark matter model within the framework of minimal extended seesaw |
recently it has been questioned, notably in the context of the scalar singlet dark matter model with mφ ≃ 60 gev, how efficiently kinetic equilibrium is maintained if freeze-out dynamics is pushed down to low temperatures by resonant effects. we outline how langevin simulations can be employed for addressing the non-eq... | langevin simulation of dark matter kinetic equilibration |
a novel search technique for ultralight dark matter has been developed and initially carried out over a limited range of frequency in l-band, utilizing the recent breakthrough listen public data release of three years of observation with the green bank telescope. the search concept depends only on the assumption of dec... | a model-independent radio telescope dark matter search |
we provide a simple model of vector dark matter (dm) which can realize the recently proposed freeze-out mechanism with catalyzed annihilation. in our setup, a vector dm field xμ and a catalyst field cμ is unified by an su(2)d gauge symmetry. these gauge fields acquire their masses via spontaneously symmetry breaking tr... | vector dark matter production from catalyzed annihilation |
the z3-invariant next-to-minimal supersymmetric standard model (nmssm) can provide a candidate for dark matter (dm). it can also be used to explain the hypothesis that the higgs signal observed on the large hadron collider (lhc) comes from the contribution of the two lightest cp-even higgs bosons, whose masses are near... | the phenomenological research on higgs and dark matter in the next-to-minimal supersymmetric standard model |
we present the model-agnostic dark halo analysis tool (madhat), a numerical tool which implements a fermi-lat data-driven, model-independent analysis of gamma-ray emission from dwarf satellite galaxies and dwarf galaxy candidates due to dark matter annihilation, dark matter decay, or other nonstandard or unknown astrop... | madhat: model-agnostic dark halo analysis tool |
we consider main properties of hadronic dark matter (dm) candidate consisting of new heavy stable quark and the light ordinary one. this additional quark arises in chiral-symmetric extension of the standard model and has standard electromagnetic and strong interactions. neutral and charged pseudoscalar low-lying states... | possibility of hadronic dark matter |
models in which dark matter particles can scatter into a slightly heavier state which promptly decays to the lighter state and a photon (known as exciting dark matter, or xdm) have been shown to be capable of generating the 3.55 kev line observed from galaxy clusters, while suppressing the flux of such a line from smal... | 3.55 kev line from exciting dark matter without a hidden sector |
exciton-polaritons are quasiparticles with mixed photon and exciton character that demonstrate rich quantum phenomena, novel optoelectronic devices and the potential to modify chemical properties of materials. organic semiconductors are of current interest for their room-temperature polariton formation. however, within... | manipulating matter with strong coupling: harvesting triplet excitons in organic exciton microcavities |
in the littlest higgs model with t-parity (lht), the t-odd heavy photon ( ah ) is weakly interacting and can play the role of dark matter. we investigate the lower limit on the mass of ahdark matter under the constraints from higgs data, ewpos, rb , planck 2015 dark matter relic abundance, pandax-ii/lux 2016 direct det... | little higgs dark matter after pandax-ii/lux-2016 and lhc run-1 |
the precise spectrum of electrons and positrons at high energies plays an important role in understanding their origin. dark matter particle explorer has reported their first measurement of thee(+e^-)spectrum from 25 gev to 4.6 tev. this spectrum reveals a tentative peak at 1.4 tev, which requires a nearby source ofe(+... | nearby dark matter subhalo that accounts for the dampe excess |
indirect detection strategies of particle dark matter (dm) in dwarf spheroidal satellite galaxies (dsphs) typically entail searching for annihilation signals above the astrophysical background. to robustly compare model predictions with the observed fluxes of product particles, most analyses of astrophysical data - whi... | dwarf spheroidal j-factor likelihoods for generalized nfw profiles |
fifty years ago the standard model offered an elegant new step towards understanding elementary fermion and boson fields, making several assumptions, suggested by experiments. the assumptions are still waiting for an explanation. there are many proposals in the literature for the next step. the spin-charge-family theor... | how does clifford algebra show the way to the second quantized fermions with unified spins, charges and families, and with vector and scalar gauge fields beyond the standard model |
in view of the recent interest in the pmssm with light third generation squarks, we consider a hitherto neglected scenario where the lighter bottom squark is the next lightest supersymmetric particle (nlsp) which co-annihilates with the lightest supersymmetric particle (lsp), the dark matter (dm) candidate. since the c... | gluino mass limits with sbottom nlsp in coannihilation scenarios |
we demonstrate how the image analysis technique of wavelet decomposition can be applied to the gamma-ray sky to separate emission on different angular scales. new structures on scales that differ from the scales of the conventional astrophysical foreground and background uncertainties can be robustly extracted, allowin... | wavelet-based techniques for the gamma-ray sky |
searches for dark matter annihilation signals have been carried out in a number of target regions such as the galactic center and milky way dwarf spheroidal galaxies (dsphs), among a few others. here we propose low surface brightness galaxies (lsbgs) as novel targets for the indirect detection of dark matter emission. ... | constraining dark matter annihilation with hsc low surface brightness galaxies |
we discuss one loop generation of the term connecting gauge fields from a local hidden su(2)h and the standard model u(1)y introducing an su(2)h doublet fermion with non-zero hypercharge and a scalar field in adjoint representation. then we obtain a kinetic mixing term between su(2)h and u(1)y gauge fields after the ad... | radiative interactions between new non-abelian gauge sector and the standard model |
the axion quark nuggets introduced in the literature are a candidate for cold dark matter which, in addition, may be relevant in baryogenesis scenarios. the present work studies the evolution of these objects till they enter in the color superconducting phase. this evolution was already considered in [s. ge, x. liang, ... | neutrino emission and initial evolution of axionic quark nuggets |
indirect dark matter (dm) detection typically involves the observation of standard model (sm) particles emerging from dm annihilation/decay inside regions of high dark matter concentration. we consider an annihilation scenario in which this reaction has to be initiated by one of the dms involved being boosted while the... | nonlocal effects from boosted dark matter in indirect detection |
we perform a systematic analysis of models with gev-scale dark matter coupled to baryons and leptons. such theories provide a natural framework to explain the matter-antimatter asymmetry of the universe. we find that only a few baryonic dark matter models are free from tree-level proton decay without explicitly imposin... | baryonic and leptonic gev dark matter |
to search for the production of a dark photon ( $a^{\prime} $ ) in the process ${e}^{+}{e}^{-}\to a^{\prime} \gamma $ , the padme apparatus has been built athe infn laboratori nazionali di frascati. it is a small-scale detector consisting of an active target, a beam monitor system, a spectrometer to measure charged par... | the padme detector |
we present the first magic/fermi-lat joint search for dark matter annihilation gamma-ray signals from dwarf satellite galaxies. we combine 158 hours of observations of segue 1 by magic with 6-years observations of 15 dwarf satellite galaxies by the fermi-lat. we obtain limits on the annihilation cross-section for dark ... | limits to dark matter properties from a combined analysis of magic and fermi-lat observations of dwarf satellite galaxies |
the existence of substructure in halos of annihilating dark matter would be expected to substantially boost the rate at which annihilation occurs. ultracompact minihalos of dark matter (ucmhs) are one of the more extreme examples of this. the boosted annihilation can inject significant amounts of energy into the gas of... | heating of galactic gas by dark matter annihilation in ultracompact minihalos |
the distribution of dark matter in the galaxy, according to state-of-the-art simulations, shows not only a smooth halo component but also a rich substructure where a hierarchy of dark matter subhalos of different masses is found. we present a search for potential dark matter subhalos in our galaxy exploiting the high (... | hunting for dark matter subhalos among the fermi-lat sources with veritas |
highly accurate measurements of cosmic ray electron flux by the dark matter particle explorer (dampe) ranging between 25 gev and 4.6 tev have recently been published. a sharp peak structure was found at 1.4 tev. this unexpected peak structure can be reproduced by the annihilation/decay of a nearby dark matter (dm) halo... | interpretation of the dampe 1.4 tev peak according to the decaying dark matter model |
in the minimal supersymmetric standard model (mssm) the lightest superparticle (lsp) can be a tev neutralino (mainly dominated by higgsino or wino) which serves as a dark matter candidate with correct thermal relic density. in this work we confront the 1-3 tev neutralino dark matter with the latest direct and indirect ... | tev susy dark matter confronted with the current direct and indirect detection data |
we make the first attempt to find dwarf galaxies in eight fermi-lat extended, unassociated, source fields using gaia dr2. after probing previously unexplored heliocentric distances of d < 20 kpc with an extreme-deconvolution (xd) technique, we find no sign of a dwarf galaxy in any of these fields despite gaia's exce... | a gaia dr2 search for dwarf galaxies towards fermi-lat sources: implications for annihilating dark matter |
the universal extra dimension (ued) paradigm is particularly attractive as it not only includes a natural candidate for the dark matter particle , but also addresses several issues related to particle physics. non-observations at the large hadron collider, though, has brought the paradigm into severe tension. however, ... | universal extra dimensions and the graviton portal to dark matter |
in this paper, we suggest a method of a complete calculation of the sommerfeld effect in both the s-wave and p-wave annihilation situations. the basic idea is to uniformly consider the equal-time bethe-salpeter wave functions of both the dark matter and the final state particles, then short-distance interactions can be... | calculations of the sommerfeld effect in a unified wave function framework |
recent high-energy data from fermi-lat on the diffuse γ-ray background have been used to set among the best constraints on annihilating tev cold dark matter candidates. in order to assess the robustness of these limits, we revisit and update the calculation of the isotropic extragalactic γ-ray intensity from dark matte... | extragalactic diffuse γ-rays from dark matter annihilation: revised prediction and full modelling uncertainties |
in the context of brane-world extra-dimensional theories, we compute the positron production from branon dark matter annihilations and compare with the ams-02 data. three different scenarios have been considered; the first two assume that either pulsars or dark matter may explain separately the whole positron fraction ... | analysis of branon dark matter and extra-dimensional models with ams-02 |
we propose two-loop neutrino mass model with gauged hidden $u(1)$ symmetry, and discuss a majorana type of dark matter candidate that has semi-annihilation processes in the relic density as well as lepton flavor violations and muon anomalous magnetic moment. also, we demonstrate global analysis to satisfy neutrino osci... | a radiative neutrino mass model with hidden gauge symmetry inducing semi-annihilating dark matter |
when thermal rate equations are derived for the evolution of slow variables, it is often practical to parametrize the right-hand side with chemical potentials. to close the system, the chemical potentials are subsequently re-expressed in terms of the slow variables, which involves the consideration of a "susceptibility... | non-relativistic susceptibility and a dark matter application |
we consider a dirac singlet fermion as thermal dark matter for explaining the x-ray line in the context of a supersymmetric higgs-portal model or a generalized dirac nmssm. the dirac singlet fermion gets a mass splitting due to their yukawa couplings to two higgs doublets and their superpartners, higgsinos, after elect... | supersymmetric higgs-portal and x-ray lines |
the dark matter relic density may be governed by the presence of new mediators that connect the dark matter field with the standard model particles. when the dark matter particle mass is larger than the mediator's, the pair production of mediators is kinematically open. this setup is known in the literature as secluded... | present and future constraints on secluded dark matter in the galactic halo with tev gamma-ray observatories |
a thermal relic wimp remains a prime candidate for the nature of dark matter, particularly for the more poorly constrained case of a heavy (≳ 1 tev) wimp. the highest fluxes from wimp annihilations are expected in the region of the galactic centre (gc) where current and near future gamma-ray observatories can be exploi... | inverse compton emission from heavy wimp annihilations in the galactic centre |
assisted annihilation is a novel mechanism to generate viable sub-gev thermal dark matter, where a pair of stable dark matter annihilates with an assister to standard model states. typically such 3 → 2 annihilation topologies are flux suppressed compared to 2 → 2 processes. in this paper, we explore the possibility of ... | resonant assisted annihilation |
real scalar triplet dark matter, which is known to be an attractive candidate for a thermal wimp, is comprehensively studied paying particular attention to the sommerfeld effect on the dark matter annihilation caused by the weak interaction and the other interaction between the dark matter and the higgs boson. we find ... | thermal real scalar triplet dark matter |
we propose a new "disappearing positron track" channel at belle ii to search for dark matter, in which a positron that is produced at the primary interaction vertex scatters with the electromagnetic calorimeter to produce dark matter particles. such scatterings can occur via either annihilation with atomic electrons, o... | a new channel to search for dark matter at belle ii |
the neutralino sector of the semi-constrained next-to-minimal supersymmetric standard model is explored under recent experimental constraints, with special attention to dark matter (dm) limits. the effects of the upper and lower bounds of dark matter relic density and recent direct detection constraints on spin-indepen... | dark matter constraints and the neutralino sector of the scnmssm |
a sterile neutrino with a kev-scale mass is a compelling dark matter candidate. we propose a new production mechanism involving the decay and annihilation of a complex scalar singlet with a higgs portal coupling which develops a vacuum expectation value. the interactions of the resulting pseudo nambu-goldstone boson ma... | freeze-in and freeze-out of sterile neutrino dark matter |
we present the full one-loop supersymmetry-qcd corrections to stop-antistop annihilation into gluons and light quarks within the minimal supersymmetric standard model including sommerfeld enhancement effects from the exchange of multiple gluons between the incoming particles. these corrections are important as stop (co... | radiative corrections to stop-antistop annihilation into gluons and light quarks |
quasars observed at redshifts z ~ 6-7.5 are powered by supermassive black holes which are too large to have grown from early stellar remnants without efficient super-eddington accretion. a proposal for alleviating this tension is for dust and metal-free gas clouds to have undergone a process of direct collapse, produci... | supermassive black hole seeds from sub-kev dark matter |
we show that majoron, the pseudo-nambu-goldstone boson resulting from the spontaneous breaking of global lepton number symmetry, can present itself as a viable freeze-in type of dark matter in a mass range o (kev-gev), thanks to the explicit higher dimensional lepton number breaking operator. interestingly, the proposa... | majorons revisited: light dark matter as a fimp |
the mass-to-luminosity ratio of the dwarf satellite galaxies in the milky way suggests that these dwarf galaxies may contain substantial dark matter. the dark matter at the dense region such as within or at the vicinity of the centres of these dwarf galaxies may undergo the process of self-annihilation and produce γ-ra... | addressing γ-ray emissions from dark matter annihilations in 45 milky way satellite galaxies and in extragalactic sources with particle dark matter models |
observations with the fermi large area telescope (lat) indicate a possible small photon signal originating from the dwarf galaxy reticulum ii that exceeds the expected background between 2 gev and 10 gev . we have investigated two specific scenarios for annihilating wimp dark matter within the phenomenological minimal ... | comparing galactic center mssm dark matter solutions to the reticulum ii gamma-ray data |
motivated by the recent result of xenon1t collaboration with full exposure, 279 life days, that sets the most stringent limit on the spin-independent dark matter-nucleon scattering cross section we discuss a dark e6-inspired model that features the presence of a u(1) d - u gauge symmetry. the dark matter candidate is a... | xenon1t takes a razor to a dark e6-inspired model |
in models of anapole dark matter (dm), the dm candidate is a majorana fermion whose primary interaction with standard model (sm) particles is through an anapole coupling to off-shell photons. as such, at tree-level, anapole dm undergoes p-wave annihilation into sm charged fermions via a virtual photon. but, generally, ... | anapole dark matter annihilation into photons |
the potential antiproton excess in the ams-02 data is of much interest and can probably come from dark matter annihilations. based on the effective field theory approach, in this work we investigate the compatibility of the dm interpretation of the ams-02 antiproton excess and the null results from direct detection exp... | consistency test of the ams-02 antiproton excess with direct detection data based on the effective field theory approach |
tucana-ii (tuc-ii), a recently discovered and confirmed ultra faint dwarf spheroidal galaxy, has a high mass to light ratio as well as a large line-of-sight stellar velocity dispersion, thus making it an ideal candidate for an indirect dark matter (dm) search. in this paper, we have analyzed nine years of γ-ray data ob... | analysis of fermi-lat data from tucana-ii: possible constraints on the dark matter models with an intriguing hint of a signal |
cosmological measurements indicate that a large component of non-visible gravitating matter is present in the universe. a common hypothesis for its origin is a weakly interacting, massive particle. annihilations or decays of such particles could produce gamma rays. the h.e.s.s. experiment is an imaging air cherenkov te... | dark matter searches with h.e.s.s |
we present a mechanism where a particle asymmetry in one sector is used to generate an asymmetry in another sector. the two sectors are not coupled through particle number violating interactions and are not required to be in thermal contact with each other. when this mechanism is applied to baryogenesis in asymmetric d... | spontaneous baryogenesis from extremely light asymmetric dark matter |
the most dramatic "sommerfeld enhancements" of neutral-wino-pair annihilation occur when the wino mass is tuned to near critical values where there is a zero-energy s-wave resonance at the neutral-wino-pair threshold. if the wino mass is larger than the critical value, the resonance is a wino-pair bound state. if the w... | wino dark matter annihilation through the radiative formation of bound states |
we provide a comprehensive study of observable spectra from dark matter pair-annihilation or decay into sterile (right-handed) neutrinos. this occurs, for instance, in neutrino portal dark matter models, where a sterile neutrino acts as the portal between dark matter and the standard model sector. the subsequent decays... | sterile neutrinos from dark matter: a ν nightmare? |
as searches for thermal and self-annihilating dark matter (dm) intensify, it becomes crucial to include as many relevant physical processes and ingredients as possible to refine signal predictions, in particular those which directly relate to the intimate properties of dm. we investigate the combined impact of dm subha... | analytical insight into dark matter subhalo boost factors for sommerfeld-enhanced s- and p-wave γ-ray signals |
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