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we study the fluctuations in the brightness temperature of 21-cm signal δt21 at the dark ages (z ∼ 100) with a dark matter (dm) candidate in inert doublet model (idm). we then explore the effects of different fractions of idm dm on δt21 signal. the idm dm masses are chosen in few tens of gev region as well as in the hi... | bounds on dark matter annihilation cross-sections from inert doublet model in the context of 21-cm cosmology of dark ages |
we investigate a non-abelian vector dark matter candidate w' with a mev-gev low mass range, accompanied by a dark photon a' and a dark z' in the context of a gauged two-higgs-doublet model. the model is scrutinized by considering various experimental constraints including dark photon searches, electroweak precision dat... | complementary searches of low mass non-abelian vector dark matter, dark photon, and dark z' |
spatial extension has been hailed as a "smoking gun" in the gamma-ray search of dark galactic subhalos, which would appear as unidentified sources for gamma-ray telescopes. in this work, we study the sensitivity of the fermi-lat to extended subhalos using simulated data based on a realistic sky model. we simulate spati... | spatial extension of dark subhalos as seen by fermi-lat and the implications for wimp constraints |
we investigate rotationally supported dwarf irregular (dirr) galaxies as a new category of targets for indirect dark matter (dm) searches with gamma-ray telescopes. in the framework of pointlike analysis, pressure-supported dwarf spheroidal (dsph) galaxies are usually considered as one of the best categories of targets... | theoretical predictions for dark matter detection in dwarf irregular galaxies with gamma rays |
in this paper, we study the impact of dark matter (dm) on neutron stars (nss) that contain antikaon (including k− and k¯0) condensations. dm is assumed to be made of nonself annihilating, but strongly or weakly self-interacting fermions. the competition between dm and antikaon condensations makes the gross stellar prop... | the impact of dark matter on neutron stars with antikaon condensations |
the equation of state for a degenerate gas of fermions at zero temperature in the non relativistic case is a polytrope, i.e. $p=\gamma \rho^{5/3}/m_f^{8/3}$. if dark matter is modelled by such non interacting fermion, this dependence in the mass of the fermion $m_f$ explains why if dark matter is very heavy the effecti... | constraining ultra light fermionic dark matter with milky way observations |
in a non-minimal higgs framework, we present a novel mechanism in which the cp violating dark particles only interact with the sm through the gauge bosons, primarily the $z$ boson. such $z$-portal dark cp violation is realised in the regions of the parameter space where higgs-mediated (co)annihilation processes are sub... | dark origins of matter-antimatter asymmetry |
we report on the exciton and trion density dynamics in a single layer of mose2, resonantly excited and probed using three-pulse four-wave mixing (fwm), at temperatures from 300 k to 77 k. a multiexponential third-order response function for amplitude and phase of the heterodyne-detected fwm signal including four decay ... | resonantly excited exciton dynamics in two-dimensional mose2 monolayers |
we explore the idea of an alternative candidate for particle dark matter namely feebly interacting massive particle (fimp) in the framework of a two component singlet scalar model. singlet scalar dark matter has already been demonstrated to be a viable candidate for wimp (weakly interacting massive particle) dark matte... | two component feebly interacting massive particle (fimp) dark matter |
using the spectral energy distribution of m87, a nearby radio galaxy in the virgo cluster, and assuming a supermassive black hole induced spike in the dark matter halo profile, we exclude any dark matter candidate with a velocity-independent (s-wave) annihilation cross-section of the order of ⟨σ v ⟩ ∼10-26 cm3 s-1 and ... | ruling out thermal dark matter with a black hole induced spiky profile in the m87 galaxy |
the h.e.s.s. collaboration has reported a high-energy spherically symmetric diffuse γ -ray emission in the inner 50 pc of the milky way, up to ∼50 tev . here, we propose a leptonic model which provides an alternative to the hadronic scenario presented by the h.e.s.s. collaboration, and connects the newly reported tev e... | connecting the new h.e.s.s. diffuse emission at the galactic center with the fermi gev excess: a combination of millisecond pulsars and heavy dark matter? |
light ( m ≤ 20 mev) dark-matter particles freeze out after neutrino decoupling. if the dark-matter particle couples to a neutrino or an electromagnetic plasma, the late time entropy production from dark-matter annihilation can change the neutrino-to-photon temperature ratio, and equally the effective number of neutrino... | light dark matter and dark radiation |
we consider photon signals arising from the annihilation or decay of low-mass (sub-gev) dark matter which couples dominantly to quarks. in this scenario, the branching fractions to the various kinematically accessible hadronic final states can largely be determined from chiral perturbation theory. several of these fina... | indirect detection of sub-gev dark matter coupling to quarks |
gamma-ray observations have long been used to constrain the properties of dark matter (dm), with a strong focus on weakly interacting massive particles annihilating through velocity-independent processes. however, in the absence of clear-cut observational evidence for the simplest candidates, the interest of the commun... | classification of gamma-ray targets for velocity-dependent and subhalo-boosted dark-matter annihilation |
the sommerfeld enhancement plays an important role in dark matter (dm) physics, and can significantly enhance the annihilation cross section of non-relativistic dm particles. in this paper, we study the effect of neutrino forces, which are generated by the exchange of a pair of light neutrinos, on the sommerfeld enhanc... | neutrino forces and the sommerfeld enhancement |
in this work, we explore the impact of dark matter (dm) relic density and direct detection constraints on a gev scale dm in the context of recent anomalous muon magnetic moment $(g-2)_{\mu}$ measurement; a $ 5.1 \sigma$ discrepancy with the sm. in $u(1)_{l_{\mu}-l_{\tau}}$ scenario the additional $z'$ boson modifies th... | light dark matter detection and neutrino floor: role of anomalous $(g-2)_{\\mu}$ |
a cluster of soft displaced tracks corresponds to the dark matter co-annihilation regime. the long-lived regime is, in particular, motivated by the unexplored top partner physics. the background in this regime is extremely challenging to model using a traditional simulation method. we demonstrate the feasibility of han... | exploring uncharted soft displaced vertices in open data |
we study the morphology of the 511 kev signal that could be produced by exciting dark matter (xdm) in the milky way. in this model, collisions between dark matter particles excite the dark matter to a state that can then decay back to the ground state, releasing an electron-positron pair. these electrons and positrons ... | the morphology of exciting dark matter and the galactic 511 kev signal |
the stronger than expected 21-cm absorption was observed by edges recently, and another anomaly of ^8be transitions would be signatures of new interactions. these two issues may be related to each other, e.g., pseudoscalar a mediated fermionic millicharged dark matter (dm) and the 21-cm absorption could be induced by p... | could the 21-cm absorption be explained by the dark matter suggested by ^8be transitions? |
compact astrophysical objects have been considered in the literature as dark matter (dm) probes, via the observational effects of annihilating captured dm. in this paper we investigate the role of stellar velocity on multiscatter-capture rates and find that the capture rates of dm by a star moving with respect to the d... | analytic approximations for the velocity suppression of dark matter capture |
the thermal production mechanism of dark matter is attractive and well-motivated by predictivity. a representative of this type of dark matter candidate is the canonical, weakly interacting massive particles. an alternative is semi-annihilating dark matter, which exhibits different phenomenological aspects from the for... | semi-annihilating dark matter coupled with majorons |
we explore a simple extension to the standard model containing two gauge singlets: a dirac fermion and a real pseudoscalar. in some regions of the parameter space both singlets are stable without the necessity of additional symmetries, then becoming a possible two-component dark matter model. we study the relic abundan... | fermion singlet dark matter in a pseudoscalar dark matter portal |
we discuss universal signals of consistent models of pseudoscalar mediators for collider searches for dark matter. keeping only the degrees of freedom that can not be decoupled due to consistency conditions, we present a universality class of simplified models with pseudoscalar mediators and renormalizable couplings to... | universal properties of pseudoscalar mediators |
in this paper we study sneutrino dark matter in a recently proposed supersymmetric electroweak-scale inverse seesaw model, in which the majority of the sneutrino dark matter particle is a mixture of the right-handed sneutrino ñcand the singlet field \tilde{s} . the scalar field x responsible for the generation of neutr... | sneutrino dark matter via pseudoscalar x-funnel meets inverse seesaw |
the fermionic z -portal dark matter model suffers from severe constraints from direct detection experiments. however, a narrow parameter space around the z -funnel region is beyond the present reach due to the resonance annihilation. in this paper, we provide an intriguing collider prospect for probing the z -funnel da... | role of future lepton colliders for fermionic z -portal dark matter models |
the nature of dark matter (dm) is one of the most debated questions of contemporary physics. ground-based arrays of cherenkov telescopes such as the high energy spectroscopic system (h.e.s.s.) search for dm signatures through the detection of very-high-energy (vhe, e > 100 gev) gamma-rays. dm particles could selfann... | latest results on dark matter searches with h.e.s.s |
we consider the higgs boson mass in a class of the umssm models in which the mssm gauge group is extended by an additional u(1) ‧ group. implementing the universal boundary condition at the gut scale we target phenomenologically interesting regions of umssm where the necessary radiative contributions to the lightest cp... | least fine-tuned u(1) extended ssm |
gamma-ray is a good probe of dark matter (dm) particles in the universe. we search for the dm annihilation signals in the direction of the andromeda galaxy (m31) using 7.5 year fermi-lat pass 8 data. similar to pshirkov et al. (2016), we find that there is residual excess emission from the direction of m31 if only the ... | constraints on the dark matter annihilation from fermi-lat observation of m31 |
the formation of stable or meta-stable bound states can dramatically affect the phenomenology of dark matter (dm). although the capture into bound states via emission of a vector is known to be significant, the capture via scalar emission suffers from cancellations that render it important only within narrow parameter ... | dark matter bound state formation via emission of a charged scalar |
we revisit the two real singlet extension of the standard model with a z2×z2' symmetry. one of the singlet scalars s2, by virtue of an unbroken z2' symmetry, plays the role of a stable dark matter candidate. the other scalar s1, with spontaneously broken z2-symmetry, mixes with the sm higgs boson and acts as the scalar... | an update on the two singlet dark matter model |
we present the first results from very-high-energy observations of the dwarf spheroidal satellite candidate triangulum ii with the magic telescopes from 62.4 h of good-quality data taken between august 2016 and august 2017. we find no gamma-ray excess in the direction of triangulum ii, and upper limits on both the diff... | a search for dark matter in triangulum ii with the magic telescopes |
recent gamma-ray and radio observations provide stringent constraints for annihilating dark matter. the current 2 σ lower limits of dark matter mass can be constrained to ∼100 gev for thermal relic annihilation cross section. in this article, we use the radio continuum spectral data of a nearby galaxy ngc4214 and diffe... | constraining the annihilating dark matter mass by the radio continuum spectral data of the ngc4214 galaxy |
in the cold dark matter scenario, galactic dark matter halos are populated with a large number of smaller subhalos. previous work has shown that dark matter annihilations in subhalos can generate a distinctive, non-poisson signal in the gamma-ray photon counts probability distribution function (pdf). here we show that ... | constraining dark matter microphysics with the annihilation signal from subhalos |
within density functional theory, we have investigated the coalescence dynamics of two superfluid helium nanodroplets hosting vortex lines in different relative orientations, which are drawn towards each other by the van der waals mutual attraction. we have found a rich phenomenology depending on how the vortex lines a... | merging of superfluid helium nanodroplets with vortices |
antimatter macroscopic dark matter (macros) refers to a generic class of antimatter dark matter candidates that interact with ordinary matter primarily through annihilation with large cross-sections. a combination of terrestrial, astrophysical, and cosmological observations constrain a portion of the anti-macro paramet... | antimatter as macroscopic dark matter |
the andromeda galaxy (m31) is a nearby (~780 kpc) galaxy similar to our own milky way. observational evidence suggests that it resides in a large halo of dark matter (dm), making it a good target for dm searches. we present a search for gamma rays from m31 using 1017 days of data from the high altitude water cherenkov ... | search for dark matter gamma-ray emission from the andromeda galaxy with the high-altitude water cherenkov observatory |
the murchison widefield array (mwa) recorded impulsive radio events in the quiet solar corona at frequencies 98, 120, 132, and 160 mhz [s. mondal, d. oberoi, and a. mohan, astrophys. j. 895, l39 (2020), 10.3847/2041-8213/ab8817]. we propose that these radio events are the direct manifestation of dark matter annihilatio... | impulsive radio events in quiet solar corona and axion quark nugget dark matter |
gev-scale dark matter is an increasingly attractive target for direct detection, indirect detection, and collider searches. its annihilation into hadronic final states produces a challenging zoo of light hadronic resonances. we update herwig7 to study the photon and positron spectra from annihilation through a vector m... | hadronic footprint of gev-mass dark matter |
assuming a dark matter fraction $\omega_{dm} = 0.27$ and a reduced hubble constant $h = 0.73$, we obtain a value of 70 gev/c$^2$ for the mass of the dark matter wimp we have previously proposed. we also obtain a value for the annihilation cross section given by $\langle \sigma_{ann} v \rangle = 1.19 \times 10^{-26} $ c... | indirect detection, direct detection, and collider detection cross-sections for a 70 gev dark matter wimp |
we analyze the prospects of the detection of an gev neutralino dark matter, , in the next-to-minimal supersymmetric standard model at the 14 tev lhc. we perform dedicated scans of the relevant parameter space of the model and find a large number of points where the thermal relic abundance due to such a dark matter is c... | gev dark matter in susy and a very light pseudoscalar at the lhc |
the dark matter abundance plays a crucial role in the determination of the valid parameter space of models both in the case of a discovery of dark matter and in the context of exclusion limits. reliable theoretical predictions of the dark matter relic density require technically demanding precision calculations, which ... | dipole formalism for massive initial-state particles and its application to dark matter calculations |
in a recent paper we showed that the decay of intermediate $\bar{\lambda}_b$ baryons can dramatically enhance the antihelium flux from dark matter annihilation. our antihelium predictions were derived using several implementations of the pythia and herwig event generators which were calibrated to existing data on antid... | response to comment on "dark matter annihilation can produce a detectable antihelium flux through $\\bar{\\lambda}_b$ decays" |
constraints on the indirect detection of dark matter are usually obtained from observations of astrophysical objects-the galactic center, dwarf galaxies, m31, etc. here we propose instead to look for the annihilation or decay of dark matter particles taking place inside detectors searching directly for dark matter or i... | laboratory limits on the annihilation or decay of dark matter particles |
minimal dark matter (mdm) stands as one of the simplest dark matter scenarios. in mdm models, annihilation and co-annihilation processes among the members of the mdm multiplet are usually very efficient, pushing the dark matter mass above 𝒪(10) tev in order to reproduce the observed dark matter relic density. motivate... | non-thermal production of minimal dark matter via right-handed neutrino decay |
we revisit the properties of positron cloud in quark nugget (qn) model of dark matter (dm). in this model, dark matter particles are represented by compact composite objects composed of a large number of quarks or antiquarks with total baryon number b ∼1024. these particles have a very small number density in our galax... | radiation from matter-antimatter annihilation in the quark nugget model of dark matter |
we study the possibility that dark matter (dm) particles of spin 0, 1/2 or 1 may interact gravitationally with standard model (sm) particles within the framework of a warped randall-sundrum (rs) model. both the dark matter and the standard model particles are assumed to be confined to the infra-red (ir) brane and only ... | spin-dependence of gravity-mediated dark matter in warped extra-dimensions |
many studies have shown that either the nearby astrophysical source or dark matter (dm) annihilation/decay can be used to explain the excess of high energy cosmic ray (cr) e ±, which is detected by many experiments, such as pamela and ams-02. recently, the dark matter particle explorer (dampe) collaboration has reporte... | explanations of the dampe high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios |
we study a simple class of dark matter models with nf copies of electroweak fermionic multiplets, stabilized by o (nf) global symmetry. unlike conventional minimal dark matter which usually suffers from landau poles, in these models the gauge coupling g2 has a non-trivial ultraviolet fixed point, and thus is asymptotic... | minimal asymptotically safe dark matter |
the fermi collaboration has recently updated their analysis of gamma rays from the center of the galaxy. they reconfirm the presence of an unexplained emission feature which is most prominent in the region of 1-10 gev, known as the galactic center gev excess (gce). although the gce is now firmly detected, an interpreta... | implications of the fermi-lat pass 8 galactic center excess on supersymmetric dark matter |
utilizing an exhaustive set of simplified models, we revisit dark matter scenarios potentially capable of generating the observed galactic center gamma-ray excess, updating constraints from the lux and pandax-ii experiments, as well as from the lhc and other colliders. we identify a variety of pseudoscalar mediated mod... | updated collider and direct detection constraints on dark matter models for the galactic center gamma-ray excess |
motivated by various excesses observed by the fermi-lat and ams collaborations, we perform a detailed analysis of qcd uncertainties on particle spectra from dark-matter annihilation (or decay) into jets. when annihilated to sm particles, the final-state annihilation products undergo various complicated processes such a... | studying qcd modeling of uncertainties in particle spectra from dark-matter annihilation into jets |
dark matter (dm) is a fundamental ingredient of our universe and of structure formation, and yet its nature is elusive to astrophysical probes. information on the nature and physical properties of the wimp (neutralino) dm (the leading candidate for a cosmologically relevant dm) can be obtained by studying the astrophys... | probing the nature of dark matter with the ska |
the fermi large area telescope has detected an extended region of gev emission towards the galactic centre that is currently thought to be powered by dark matter annihilation or a population of young and/or millisecond pulsars. in a test of the pulsar hypothesis, we have carried out an initial search of a 20 deg2 area ... | searching for pulsars associated with the fermi gev excess |
this study searches for neutrino signals from 18 dwarf spheroidal galaxies (dsphs) using 10 years of publicly available muon-track data of the icecube neutrino observatory. we apply an unbinned likelihood analysis on each of these dsphs to derive the significance the putative neutrino emission. to further enhance our s... | searching for dark-matter induced neutrino signals in dwarf spheroidal galaxies using 10 years of icecube public data |
in this study, we analyze the direct-detection constraints of light dark matter in the next-to minimal supersymmetric standard model (nmssm) with non-universal higgs masses (nuhm); we specially focus on the correlation between higgsino asymmetry and spin-dependent (sd) cross section. we draw the following conclusions. ... | higgsino asymmetry and direct-detection constraints of light dark matter in the nmssm with non-universal higgs masses |
dark matter annihilation might power the first luminous stars in the universe. these types of stars, known as dark stars, could form in (106- 1 08) m⊙ protohalos at redshifts z ∼20 , and they could be much more luminous and larger in size than ordinary stars powered by nuclear fusion. we investigate the formation of da... | dark stars powered by self-interacting dark matter |
in this research we consider a u(1)x gauge boson acting as a dark matter candidate. the vector dark matter (dm) gets mass when a complex singlet scalar breaks the gauge symmetry spontaneously, adding a second higgs boson to the spectra. the dark matter candidates communicate with the sm particles via a scalar-higgs por... | (sub)gev dark matter in the u(1)x higgs portal model |
we propose a model with two different extra u (1 ) gauge symmetries; muon minus tauon symmetry u (1 )lμ-lτ and hidden symmetry u (1 )h. then, we explain the muon anomalous magnetic moment, semileptonic decays b →s ℓℓ¯, and dark matter. in particular, we find an intriguing dark matter candidate to be verified by hyper-k... | neutrinophilic dark-matter annihilation in a model with u (1 )lμ-lτ×u (1 )h gauge symmetry |
photometric and spectroscopic observations of the carina dsph revealed that this galaxy contains two dominant stellar populations of different age and kinematics. the coexistence of multiple populations provides new constraints on the dark halo structure of the galaxy, because different populations should be in equilib... | dark halo structure in the carina dwarf spheroidal galaxy: joint analysis of multiple stellar components |
we perform a detailed analysis of the synchrotron signals produced by dark matter annihilations and decays. we consider different set-ups for the propagation of electrons and positrons, the galactic magnetic field and dark matter properties. we then confront these signals with radio and microwave maps, including planck... | updated galactic radio constraints on dark matter |
dark matter that participates in baryon-number violating interactions can annihilate with baryons if the dark matter particle is not protected under discrete symmetries. in this paper we investigate the dark matter-baryon annihilation in color-triplet extensions of the standard model, in which a fermionic dark matter c... | nucleon-light dark matter annihilation through baryon number violation |
indirect detection of dark matter is a major avenue for discovery. however, baryonic backgrounds are diverse enough to mimic many possible signatures of dark matter. in this work, we study the newly proposed technique of dark matter velocity spectroscopy [e. g. speckhard, k. c. y. ng, j. f. beacom, and r. laha, phys. r... | doppler effect on indirect detection of dark matter using dark matter only simulations |
we study the effect of the elastic scattering on the non-thermal wimp, which is produced by direct decay of heavy particles at the end of reheating. the non-thermal wimp becomes important when the reheating temperature is well below the freeze-out temperature. usually, two limiting cases have been considered. one is th... | a map of the non-thermal wimp |
recent studies of radio data put strong constraints on annihilation cross sections for dark matter. in this article, we provide the first analysis of using m33 radio data in constraining annihilating dark matter. the resulting constraints of annihilation cross sections for some channels are more stringent than that obt... | constraining annihilating dark matter by radio data of m33 |
dark matter (dm) in earth-intersecting orbits can scatter off electrons and lose energy, and be gravitationally bound to the earth. eventually, they lose enough energy and accumulate at the core. it is assumed that dm annihilates/decays predominantly into standard model particles inside the earth. the heat flux from th... | constraints on leptophilic light dark matter from internal heat flux of earth |
the extremely large density of ultra-dense hydrogen h(0) has been proved in numerous experiments by three laser-induced methods, namely coulomb explosions observed by particle time-of-flight (tof) and tof mass spectrometry, rotational emission spectroscopy in the visible, and annihilation-like meson ejecting nuclear re... | ultradense protium p(0) and deuterium d(0) and their relation to ordinary rydberg matter: a review |
the search for emission from weakly interacting massive particle (wimp) dark matter annihilation and decay has become a multipronged area of research not only targeting a diverse selection of astrophysical objects, but also taking advantage of the entire electromagnetic spectrum. the decay of wimp particles into standa... | searching for dark matter signals from local dwarf spheroidal galaxies at low radio frequencies in the gleam survey |
we study self-interacting dark matter signatures at the large hadron collider. a light dark photon, mediating dark matter self-interactions, can bind dark matter particles to form a bound state when they are produced via a heavy pseduoscalar in pp collisions. the bound state can further annihilate into a pair of booste... | displaced lepton jet signatures from self-interacting dark matter bound states |
it was recently proposed that weakly interacting massive particles (wimp) may provide new ways of generating the observed baryon asymmetry in the early universe, as well as addressing the cosmic coincidence between dark matter (dm) and baryon abundances. this suggests a new possible connection between weak scale new pa... | a review of wimp baryogenesis mechanisms |
although defect clusters are detrimental to the electronic and mechanical properties of semiconductor materials, annihilation of such clusters is limited by their lack of thermal mobility due to high migration barriers. here, we find that small clusters in bulk sic (a covalent material of importance for both electronic... | radiation-induced mobility of small defect clusters in covalent materials |
positron excess observed by pamela, fermi and ams02 may be due to dark matter (dm) pair annihilation or decay dominantly into muons. in this paper, we consider a scenario with thermal fermionic dm (χ) with mass ∼ o (1- 2) tev decaying into a dark higgs (ϕ) and an active neutrino (νa) instead of the sm higgs boson and ν... | ams02 positron excess from decaying fermion dm with local dark gauge symmetry |
a recently proposed dark matter wimp (weakly interacting massive particle) has only second-order couplings to gauge bosons and itself. as a result, it has small annihilation, scattering, and creation cross-sections, and is consequently consistent with all current experiments and the observed abundance of dark matter. t... | a dark matter wimp that can be detected and definitively identified with currently planned experiments |
in this work, we study the cross-correlation between fermi-lat diffuse γ-ray maps and galaxy cluster catalogues in order to search for a diffuse dark matter (dm) signal. we employ an accurate estimation of the error covariance matrix and we select four galaxy cluster catalogues at low-redshift 0 < z < 0.2 with la... | bounds on wimp dark matter from galaxy clusters at low redshift |
the detection of dark matter subhalos without a stellar component in the galactic halo remains a challenge. we use supervised machine learning to identify high-latitude gamma-ray sources with dark matter-like spectra among unassociated gamma-ray sources in the 4fgl-dr2. out of 843 4fgl-dr2 unassociated sources at |b| ≥... | machine-learned dark matter subhalo candidates in the 4fgl-dr2: search for the perturber of the gd-1 stream |
recent gamma-ray observations and radio observations put strong constraints on the parameters of dark matter annihilation. in this article, we derive new constraints for six standard model annihilation channels by using the recent radio data of the m31 galaxy. the new constraints are generally tighter than the constrai... | revisiting the constraints on annihilating dark matter by the radio observational data of m31 |
the adiabatic growth of a black hole (bh) may enhance the dark matter (dm) density surrounding it, causing a spike in the dm density profile. the spike around the supermassive bh at the center of the milky way may lead to a dramatic enhancement of the gamma-ray flux of dm annihilation from the galactic center (gc). in ... | search for gamma-ray line signals around the black hole at the galactic center with dampe observation |
a possible dark matter model postulates that it interacts with standard model particles only through a massive photon-like vector particle, called dark photon or a‧. the padme experiment at the daφne beam-test facility (btf) in frascati is designed to detect dark photons produced in positron on fixed target annihilatio... | development and test of a drs4-based daq system for the padme experiment at the daφne btf |
a possible density spike of dark matter (dm) in the subparsec region near the supermassive black hole at the galactic center could have a significant effect on indirect signals of dark matter annihilation. here we explore the impacts of the modeling of the dark matter distribution in the inner galaxy on gamma-ray signa... | black holes, dark matter spikes, and constraints on simplified models with t -channel mediators |
the long standing anomaly in the positron flux as measured by the pamela and ams-02 experiments could potentially be explained by dark matter (dm) annihilations. this scenario typically requires a large "boost factor" to be consistent with a thermal relic dark matter candidate produced via freeze-out. however, such an ... | late decaying 2-component dark matter scenario as an explanation of the ams-02 positron excess |
white dwarfs (wds) are the most promising captors of dark matter (dm) particles in the crests that are expected to build up in the cores of dense stellar clusters. the dm particles could reach sufficient densities in wd cores to liberate energy through self-annihilation. the extinction associated with our galactic cent... | probing dark matter crests with white dwarfs and imbhs |
we propose a model of baryogenesis achieved by the annihilation of non-thermally produced wimps from decay of heavy particles, which can result in low reheating temperature. dark matter (dm) can be produced non-thermally during a reheating period created by the decay of long-lived heavy particle, and subsequently re-an... | non-thermal wimp baryogenesis |
a thermal relic, often referred to as a weakly interacting massive particle (wimp), is a particle produced during the early evolution of the universe whose present (relic) abundance depends only on its mass and its thermally averaged annihilation cross section (annihilation rate factor) ⟨σ v ⟩ann . late time wimp annih... | cmb constraints on the thermal wimp mass and annihilation cross section |
so far, direct detection searches have come up empty handed in their quest for dark matter (dm). meanwhile, asteroseismology arises as a complementary tool to study dm, as its accumulation in a star can enhance energy transport by providing a conduction mechanism, producing significant changes in the stellar structure ... | asteroseismic constraints on asymmetric dark matter: light particles with an effective spin-dependent coupling |
the ska will build upon early detections of the eor by precursor instruments, such as mwa, paper, and lofar, and planned instruments, such as hera, to make the first high signal-to-noise measurements of fluctuations in the 21 cm brightness temperature from both reionization and the cosmic dawn. this will allow both ima... | cosmology from eor/cosmic dawn with the ska |
in this work, we study the annihilation of fermionic dark matter, considering it as a neutral particle with non-vanishing magnetic (m) and electric (d) dipole moments. effective cross section of the process $\chi \overline{\chi }\to \gamma \gamma $ is computed starting from a general form of the coupling $\chi \overlin... | signatures of dipolar dark matter on indirect detection |
constraints on dark matter annihilation or decay offer unique insights into the nature of dark matter. we illustrate how surveys dedicated to detect the highly redshifted 21 cm signal from the dark ages will offer a new window into properties of particle dark matter. the 21 cm intensity mapping signal and its fluctuati... | enlightening the dark ages with dark matter |
we study the prospects for the large synoptic survey telescope (lsst) to find new dwarf spheroidal galaxies in the milky way. adopting models of milky-way halo substructure and phenomenological prescriptions connecting subhalos and satellite galaxies, we obtain surface brightness distributions of v-band magnitude that ... | discovery prospects of dwarf spheroidal galaxies for indirect dark matter searches |
sharp spectral structures in the γ-ray band are an important dark matter (dm) signature. previously, a tentative line feature at ~43 gev was reported in 16 nearby galaxy clusters (gcls) with 7.1 yr of fermi large area telescope (lat) data, whose test statistic (ts) value is ~16.7. in this work, we search for line signa... | search for line-like and box-shaped spectral features from nearby galaxy clusters with 11.4 years of fermi large area telescope data |
we consider models of light dark matter coupled to quarks through a vector current interaction. for low energies, these models must be treated through the effective couplings to mesons, which are implemented here through the chiral lagrangian. we find the signals of dark matter annihilation and decay to the light meson... | dark matter through the quark vector current portal |
we explore a two-component dark matter scenario in an extended kim-shifman-vainshtein-zakharov (ksvz) axion framework. this hybrid setup incorporates an extra su(2)l complex singlet scalar whose lightest component plays the role of one of the dark matter, while the qcd axion of the ksvz model acts as a second dark matt... | top-philic dark matter in a hybrid ksvz axion framework |
we consider the consequences of a matter power spectrum which rises on small scales until eventually being cut off by microphysical processes associated with the particle nature of dark matter. evolving the perturbations of a weakly interacting massive particle from before decoupling until deep in the nonlinear regime,... | enhanced small-scale structure in the cosmic dark ages |
many particle dark matter models predict that the dark matter undergoes cascade annihilations, i.e. the annihilation products are 4-body final states. in the context of model-independent cascade annihilation processes, we study the compatibility of the dark matter interpretation of the fermi-lat galactic center gamma-r... | confronting galactic center and dwarf spheroidal gamma-ray observations with cascade annihilation models |
we estimate the current theoretical uncertainty in supersymmetric dark matter predictions by comparing several state-of-the-art calculations within the minimal supersymmetric standard model (mssm). we consider standard neutralino dark matter scenarios — coannihilation, well-tempering, pseudoscalar resonance — and bench... | theoretical uncertainties in the calculation of supersymmetric dark matter observables |
the minimal supersymmetric setup offers a comprehensive framework to interpret the fermi-lat galactic center excess. taking into account experimental, theoretical, and astrophysical uncertainties we can identify valid parameter regions linked to different annihilation channels. they extend to dark matter masses above 2... | harmonizing the mssm with the galactic center excess |
we propose and study a scalar extension of the standard model which respects a z3 symmetry remnant of the spontaneous breaking of a global u(1)dm symmetry. the model has a dark matter candidate whose relic density is determined by three classes of processes: the usual self-annihilation, semi-annihilation and purely dar... | z3 wimp and simp dark matter from a global u(1) breaking |
a detailed study of a fermionic quintuplet dark matter in a left-right symmetric scenario is performed in this article. the minimal quintuplet dark matter model is highly constrained from the wmap dark matter relic density (rd) data. to elevate this constraint, an extra singlet scalar is introduced. it introduces a hos... | sub-tev quintuplet minimal dark matter with left-right symmetry |
the potential of the planned gamma-400 gamma-ray telescope for detecting subhalos of mass between 106 m ⊙ and 109 m ⊙ in the milky way galaxy that consist of annihilating dark matter in the form of weakly interacting massive particles (wimps) is studied. the inner structure of dark matter subhalos and their distributio... | detactability of dark matter subhalos by means of the gamma-400 telescope |
white dwarfs (wd) capture dark matter (dm) as they orbit within their host halos. these captured particles may subsequently annihilate, heating the stellar core and preventing the wd from cooling. the potential wells of wds are considerably deeper and core temperatures significantly cooler than those of main sequence s... | indirect probes of dark matter and globular cluster properties from dark matter annihilation within the coolest white dwarfs |
the substructures of the galactic dark matter halo such as dark matter subhalos and dwarf galaxies have very low velocity dispersions, which makes them useful in constraining the scenario of sommerfeld-enhanced dark matter annihilation. we calculate the velocity distribution of dark matter particles in the dark matter ... | constraints on the sommerfeld- enhanced dark matter annihilation from the gamma rays of subhalos and dwarf galaxies |
we perform a comprehensive dark matter analysis of left-right supersymmetric scenarios that includes constraints from dark matter direct and indirect detection experiments and that presents distinctive features from those available in minimal supersymmetry. we concentrate on dark matter candidates which, while satisfyi... | multileptonic signals of co-annihilating left-right supersymmetric dark matter |
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