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the diffuse gamma-ray background (dgb) above 100 gev at high-latitudes is expected to be produced by unresolved extragalactic objects such as active galactic nuclei, isotropic galactic gamma-rays, and possible emission from dark matter annihilations or decays in the galactic dark matter halo. the dgb has been observed ... | constraints on the diffuse gamma-ray background with hawc |
in this work, we propose a novel scenario to probe the interactions between dark matter (dm) particles and electrons via hydrogen-atmosphere pulsating white dwarfs (davs) in globular clusters. in this special configuration, the dm particles, which are predominantly captured by multiple scattering with the electrons in ... | probing the dark matter-electron interactions via hydrogen-atmosphere pulsating white dwarfs |
in order to search for the linelike signals in the fermi-lat data, we have analyzed totally 49152 regions of interest (rois) that cover the whole sky. no roi displays a line signal with test statistic (ts) value above 25, while for 50 rois weak linelike excesses with ts >16 are presented. the intrinsic significances... | search for line-like signals in the all-sky fermi-lat data |
exponential suppression or commonly known as the boltzmann suppression in the number density of dark matter is the key ingredient for creating chemical imbalance prior to the usual thermal freeze-out. a degenerate/quasi-degenerate dark sector can experience a different exponential suppression in the number density anal... | when freeze-out occurs due to a non-boltzmann suppression: a study of degenerate dark sector |
inspired by our recent paper "reshuffled simp dark matter", we notice that the reaction rate of the two-loop induced $2 \to 2$ process may dominate over or be comparable with that of the $3 \to 2$ process at the chemical freezeout of co-simp dark matter [phys. rev. lett. 125, 131301 (2020)], especially when the co-simp... | comment on "new freezeout mechanism for strongly interacting dark matter" |
the presence of dark matter (dm) is suggested by a wealth of astrophysical and cosmological measurements. however, its underlying nature is yet unknown. among the most promising candidates are weakly interacting massive particles (wimps): particles with mass and coupling strength at the electroweak scale and thermally ... | search for dark matter annihilation signals from the galactic center with the h.e.s.s. inner galaxy survey |
in the cosmological paradigm, cold dark matter (dm) dominates the mass content of the universe and is present at every scale. candidates for dm include many extensions of the standard model with weakly interacting massive particles (wimps) in the mass range from ~10 gev to greater than 10 tev. the self-annihilation or ... | the veritas dark matter program |
the weakly interacting massive particle (wimp) has been one of the most attractive candidates for dark matter (dm), and the lightest neutralino (\widetilde{χ }^0_1) in the next-to-minimal supersymmetric standard model (nmssm) is an interesting realization of the wimp framework. the galactic center excess (gce) indicate... | interpretations of galactic center gamma-ray excess confronting the pandax-ii constraints on dark matter-neutron spin-dependent scatterings in the nmssm |
dark matter may interact with standard model (sm) particle through the exchange of a massive spin-2 graviton producing signals that can be detected. in this work we examine the γ-ray emission signals, including the line emission and the continuous spectrum component in such a massive graviton-mediated dark matter model... | γ-ray emission signals in the massive graviton mediated dark matter model |
cold dark matter subhalos are expected to populate galaxies in numbers. if dark matter self-annihilates, these objects turn into prime targets for indirect searches, in particular with gamma-ray telescopes. incidentally, the fermi-lat catalog already contains many unidentified sources that might be associated with subh... | statistics for dark matter subhalo searches in gamma rays from a kinematically constrained population model: fermi-lat-like telescopes |
the two messenger results of the gev gamma-ray excess at the galactic center and a probable antiproton excess in the recent ams-02 observation suggest that these two anomalies may be owing to the same origin—the dark matter (dm) annihilation into b b ¯, while these results seem in tension with the dwarf spheroidal gala... | interpretation of the gamma-ray excess and ams-02 antiprotons: velocity dependent dark matter annihilations |
we examine the possibility of a dark matter (dm) contribution to the recently observed gamma-ray spectrum seen in the m31 galaxy. in particular, we apply limits on weakly interacting massive particle dm annihilation cross-sections derived from the coma galaxy cluster and the reticulum ii dwarf galaxy to determine the m... | a multi-frequency analysis of possible dark matter contributions to m31 gamma-ray emissions |
here we investigate the possibility that some globular clusters (gcs) harbor intermediate mass black holes (bh) in their centers and are also embedded in a low-mass dark matter (dm) halo. up to date, there is no evidence on whether or not gcs have dm in their constitution. for standard cold dm cosmology, it is expected... | what could be the observational signature of dark matter in globular clusters? |
a wide range of mechanisms predict present-day s -wave dark matter (dm) annihilation cross sections that are orders of magnitude below current experimental sensitivity. we explore the capability of dm density spikes around the milky way's supermassive black hole to probe such faint signals of dm annihilations, consider... | faint dark matter annihilation signals and the milky way's supermassive black hole |
we use the stellar evolution code mesa to study dark stars (dss). dss, which are powered by dark matter (dm) self-annihilation rather than by nuclear fusion, may be the first stars to form in the universe. we compute stellar models for accreting dss with masses up to 106 m ⊙. the heating due to dm annihilation is self-... | dark stars: improved models and first pulsation results |
in order to observe annihilation and decay of dark matter, several types of potential sources should be considered. some sources, such as dwarf galaxies, are expected to have very low astrophysical backgrounds but fairly small dark matter densities. other sources, like the galactic center, are expected to have larger d... | dark matter annihilation and decay searches with the high altitude water cherenkov (hawc) observatory |
imaging atmospheric cherenkov telescope (iact) searches for dark matter often perform observations in "wobble mode," i.e., simultaneously collecting data from the signal region and from a corresponding background control region. this observation strategy is possibly compromised in scenarios where dark matter annihilate... | wobbly dark matter signals at cherenkov telescopes from long-lived mediator decays |
many theories of dark matter (dm) predict that dm particles can be captured by stars via scattering on ordinary matter. they subsequently condense into a dm core close to the center of the star and eventually annihilate. in this work, we trace dm capture and annihilation rates throughout the life of a massive star and ... | dark gamma-ray bursts |
in this work, we simulate a set of realizations of the local volume dark matter subhalo population based on the distributions and relations derived from via lactea ii n -body simulation. we calculate the j-factors of these subhalos, and find that the low mass subhalos contribute a lot to the total j-factors. combining ... | limits on dark matter annihilation cross sections to gamma-ray lines with subhalo distributions in n -body simulations and fermi lat data |
recent observations of galactic cosmic rays (cr) in the 1-500 gev energy range have revealed striking deviations from what deemed "standard." the anomalies cut across hadronic and leptonic crs. i discuss findings that challenge physical mechanisms long held responsible for the cr production in galactic supernova remnan... | newly-discovered anomalies in galactic cosmic rays: time for exotic scenarios? |
the possibility of light dark matter (dm) annihilating through a dark photon (dp) which kinetically mixes (km) with the standard model (sm) hypercharge field is a very attractive scenario. for dm in the interesting mass range below ∼ 1 gev, it is well known that bounds from the cmb provide a very strong model building ... | the bactrian effect: multiple resonances and light dirac dark matter |
gev-scale dark matter is an increasingly attractive target for direct detection, indirect detection, and collider searches. especially for masses in the mev to gev range, indirect detection is expected to give a leading constraint. in that range, dark matter annihilations into hadronic final states produce a challengin... | mev astronomy with herwig? |
dark matter particles can be gravitationally trapped by celestial bodies, motivating searches for localized annihilation or decay. if neutrinos are among the decay products, then icecube and other neutrino observatories could detect them. we investigate this scenario for dark matter particles above mχ≳pev producing tau... | using secondary tau neutrinos to probe heavy dark matter decays in earth |
if two annihilation products of dark matter (dm) particles are non-relativistic and coupled to a light force mediator, their plane wave functions are modified due to multiple exchanges of the force mediators. this gives rise to the sommerfeld effect (se). we consider the attractive and repulsive force se on the relic d... | sommerfeld effect in freeze-in dark matter |
while cosmological and astrophysical probes suggest that dark matter would make up for 85% of the total matter content of the universe, the determination of its nature remains one of the greatest challenges of fundamental physics. assuming the λcdm cosmological model, weakly interacting massive particles would annihila... | dark matter indirect detection limits from complete annihilation patterns |
in the cosmological paradigm, cold dark matter (dm) dominates the mass content of the universe and is present at every scale. candidates for dm include many extensions of the standard model, with a weakly interacting massive particle (wimp) in the mass range from $\sim$10 gev to greater than 10 tev. the self-annihilati... | the veritas dark matter program |
we test the plausibility of the hypothesis that the annihilation of a majorana fermion dark matter particle via a scalar mediator explains the gamma ray excess from the galactic center. assuming that the mediator couples to all third generation fermions we calculate observables for dark matter abundance and scattering ... | interpreting the fermi-lat gamma ray excess in the simplified framework |
natural and artificial light harvesting systems often operate in a regime where the flux of photons is relatively low. besides absorbing as many photons as possible it is therefore paramount to prevent excitons from annihilation via photon re-emission until they have undergone an irreversible energy conversion process.... | quantum-enhanced capture of photons using optical ratchet states |
we investigate electric dipole moments (edms) in a c p -violating minimal supersymmetric standard model with the binolike neutralino dark matter (dm) annihilating through the heavy higgs funnel. motivated by the current experimental results, in particular, the measured mass of the standard model-like higgs boson, we co... | electric dipole moments and dark matter in a c p violating mssm |
we investigate constraints on the interactions of light dark matter with standard model quarks in a framework with effective contact operators mediating the decay of heavy flavor bound state quarkonium to dark matter and a photon. when considered in combination with decays to purely invisible final states, constraints ... | constraints on light dark matter from single-photon decays of heavy quarkonium |
annihilating dark matter (dm) models offer promising avenues for future dm detection, in particular via modification of astrophysical signals. however, when modelling such potential signals at high redshift, the emergence of both dm and baryonic structure, as well as the complexities of the energy transfer process, nee... | dark matter annihilation in the circumgalactic medium at high redshifts |
we study how to set the initial evolution of general cosmological fluctuations at second order, after electron-positron annihilation. we compute approximate initial solutions for the transfer functions of all the relevant cosmological variables sourced by quadratic combinations of adiabatic and isocurvature modes. we p... | isocurvature initial conditions for second order boltzmann solvers |
the padme (positron annihilation into dark matter experiment) will search for the production of a dark photon from positron-electron annihilation e+e- → γa‧ using the positron beam of the beam test facility (btf) of the da φne linac at laboratori nazionali di frascati (lnf). this paper presents the status of the charge... | the charged particle veto system of the padme experiment |
we calculate the rate of production of dark photons from electron-positron pair annihilation in hot and dense matter characteristics of supernova progenitors. given the nonlinear dependence of the emission rate on the dark photon mass and current astrophysical constraints on the dark photon parameter space, we focus on... | rate of dark photon emission from electron positron annihilation in massive stars |
terzan 5 is the only galactic globular cluster that has plausibly been detected at very high energies by the high energy stereoscopic system. it has an unexpectedly asymmetric very high energy morphology that is offset from the cluster center, in addition to a large-scale, offset radio structure and compact diffuse x-r... | probing the pulsar population of terzan 5 via spectral modeling |
we compute the cosmological boost factor at high redshifts of z =10 - 100 by integrating the nonlinear matter power spectrum measured from high-resolution cosmological n -body simulations. an accurate boost factor is required to estimate the energy injection from dark matter annihilation, which may affect the cosmologi... | cosmological boost factor for dark matter annihilation at redshifts of z =10 -100 using the power spectrum approach |
so far all evidences of dark matter (dm) come from astrophysical and cosmological observations, due to the gravitational interactions of dm. it is possible that the true dm particle in the universe joins gravitational interactions only, but nothing else. such a gravitational dm (gdm) may act as a weakly interacting mas... | probing gravitational dark matter |
if dark matter interactions with standard model particles are c p violating, then dark matter annihilation/decay can produce photons with a net circular polarization. we consider the prospects for experimentally detecting evidence for such a circular polarization. we identify optimal models for dark matter interactions... | prospects for detecting a net photon circular polarization produced by decaying dark matter |
weakly interacting massive particles (wimps) are well-motivated candidates for dark matter (dm). wimp models often include self-annihilation into standard model particles such as neutrinos which could potentially be detected by the icecube neutrino observatory. various searches for a dark matter induced signal have bee... | dark matter searches with the icecube upgrade |
dwarf spheroidal galaxies are excellent targets in γ -ray searches for dark matter. we consider dark matter searches in dwarf spheroidal galaxies (dsphs) with the cherenkov telescope array (cta). the aim of this work is to reveal a quantitative and precise dependence of the accessible dark matter annihilation cross sec... | dependence of accessible dark matter annihilation cross sections on the density profiles of dwarf spheroidal galaxies with the cherenkov telescope array |
low luminosity dwarf galaxies provide stringent constraints on the nature of dark matter. establishing these constraints depends on precise kinematic measurements of individual stars. in this overview for non-specialists, we describe current and future prospects for three unique tests of dark matter using resolved stel... | illuminating the darkest galaxies |
the present work derived the robust constraints on annihilating wimp parameters utilizing new radio observations of m31, as well as new studies of its dm distribution and other properties. the characteristics of emission due to dm annihilation were computed in the frame of 2d galactic model employing galprop code adapt... | updated constraints on wimp dark matter annihilation by radio observations of m31 - all annihilation channels |
the positron annihilation to dark matter experiment (padme) uses the positron beam of the da$\phi$ne beam-test facility, at the laboratori nazionali di frascati (lnf) to search for a dark photon $a'$. the search technique studies the missing mass spectrum of single-photon final states in $e^+e^-\rightarrow a'\gamma$ an... | dark sector studies with the padme experiment |
recent indirect searches of dark matter using gamma-ray, radio, and cosmic ray data have provided some stringent constraints on annihilating dark matter. in this article, we propose a new indirect method to constrain annihilating dark matter. by using the data of the g2 cloud near the galactic supermassive black hole s... | a new method to constrain annihilating dark matter |
dark matter (dm) can give observable effects decaying or annihilating with production of electrons or/and photons. such probability was widely researched for our galaxy. here we consider one aspect of similar effect for andromeda galaxy. we explicitly estimate the energy of the photon of the medium experiencing inverse... | theoretical indication of a possible asymmetry in gamma-radiation between andromeda halo hemispheres due to compton scattering on electrons from their hypothetical sources in the halo |
the supersymmetric custodial triplet model adds to the particle content of the minimal supersymmetric standard model three s u (2 )l triplet chiral superfields with hypercharge y =(0 ,±1 ) . at the superpotential level, the model respects a global s u (2 )l⊗s u (2 )r symmetry only broken by the yukawa interactions. the... | dark matter from the supersymmetric custodial triplet model |
we study the bound-state spectrum in a simple model of pseudo-dirac dark matter, and examine how the rate of bound-state formation through radiative capture compares to sommerfeld-enhanced annihilation. we use this model as an example to delineate the new features induced by the presence of a mass splitting between the... | bound states of pseudo-dirac dark matter |
we attempt to understand the baryon-dark matter coincidence problem within the quark seesaw extension of the standard model where parity invariance is used to solve the strong c p problem. the s u (2 )l×s u (2 )r×u (1 )b -l gauge symmetry of this model is extended by a dark u (1 )x group plus inclusion of a heavy neutr... | quark seesaw mechanism, dark u (1 ) symmetry, and the baryon-dark matter coincidence |
n-body simulations predict that galaxies at the milky way scale host a large number of dark matter (dm) subhalos. some of these subhalos, if they are massive enough or close enough to the earth, might be detectable in γ rays due to the dm annihilation. 3fgl j 2212.5 +0703 , an unidentified gamma-ray source, has been su... | testing the dark matter subhalo hypothesis of the gamma-ray source 3fgl j 2212.5 +0703 |
we supplement the minimal supersymmetric standard model (mssm) with vectorlike copies of standard model particles. such fourth generation particles can raise the higgs boson mass to the observed value without requiring very heavy superpartners, improving naturalness and the prospects for discovering supersymmetry at th... | reviving bino dark matter with vectorlike fourth generation particles |
we study the impact of the dark matter velocity distribution modelling on signals from velocity-dependent dark matter annihilation in milky way dwarf spheroidal galaxies. using the high resolution apostle simulations, we identify analogues corresponding to milky way dwarf spheroidal galaxies, and from these directly de... | velocity-dependent j-factors for milky way dwarf spheroidal analogues in cosmological simulations |
stars that evolve near the galactic massive black hole show strange behaviors. the spectroscopic features of these stars show that they must be old. but their luminosities are much higher than the amounts that are predicted by the current stellar evolutionary models, which means that they must be active and young stars... | the effect of dark matter on stars at the galactic center: the paradox of youth problem |
gamma-ray bursts (grbs) are believed to be powered by ultrarelativistic jets. if these jets encounter and accelerate excess electrons and positrons produced by particle dark matter (dm) annihilation, the observed electromagnetic radiation would be enhanced. in this paper, we study grb afterglow emission with the presen... | contribution of dark matter annihilation to gamma-ray burst afterglows near massive galaxy centers |
the present work analyzes various aspects of m31 gamma-ray halo emission in its relation to annihilating dark matter (dm). the main aspect is the predicted effect of asymmetry of the intensity of emission due to inverse compton scattering (ics) of a possible population of relativistic electrons and positrons (e±) in th... | nature of m31 gamma-ray halo in relation to dark matter annihilation |
the tentative 1.4 tev e+e- excess observed by dampe, if not a statistical fluctuation, may be explained by dark matter (dm) annihilation within a nearby subhalo with a distance of <0.3 kpc. the process of dm annihilating to e+e- is accompanied by the production of gamma-ray photons, which could lead to detectable si... | on the gamma-ray signals from ucmh/mini-spike accompanying the dampe 1.4 tev e+e- excess |
in the course of working on the extension [2] of ref. [1] to higgsino dark matter annihilation, we became aware of two mistakes and a number of typos in this article. | erratum to: resummed photon spectrum from dark matter annihilation for intermediate and narrow energy resolution |
in light of the observed galactic center gamma-ray excess, we investigate a simplified model, for which the scalar dark matter interacts with quarks through a pseudoscalar mediator. the viable regions of the parameter space, that can also account for the relic density and evade the current searches, are identified, if ... | search for scalar dark matter via pseudoscalar portal interactions in light of the galactic center gamma-ray excess |
current bounds from several astrophysical and laboratory observations are pointing towards new paradigms for dark matter properties. through a complete analysis of this landscape and a comparison between experimental data, guided by a criterion for simplicity, one can try to solve the puzzling question of what dark mat... | dark matter: tev-ish rather than miraculous, collisionless rather than dark |
we introduce a simple scenario involving fermionic dark matter (χ ) and singlet scalar mediators that may account for the galactic center gev γ -ray excess while satisfying present direct detection constraints. c p violation in the scalar potential leads to a mixing between the standard model higgs boson and the scalar... | indirect detection imprint of a c p violating dark sector |
in this article, we report a new signature of dark matter annihilation based on the radio continuum data of ngc 1569 galaxy detected in the past few decades. after eliminating the thermal contribution of the radio signal, an abrupt change in the spectral index is shown in the radio spectrum. previously, this signature ... | a possible signature of annihilating dark matter |
there is strong evidence about the existence of unknown dark matter in the universe. many different theories about this dark matter exist, but most probably it is made of a new kind of fundamental particle that has to be massive, stable, electrically neutral, and having only weak interaction with standard matter (weakl... | unidentified fermi objects in the view of h.e.s.s. - possible dark matter clumps |
in this paper, we explore the possibility of a linearly polarized gamma-ray signal from dark matter annihilations in the galactic center. considering neutral weakly interacting massive particles, a polarized gamma-ray signal can be realized by a two-component dark matter model of majorana fermions with an anapole momen... | polarized gamma rays from dark matter annihilations |
we investigate the sommerfeld enhancement (se) in the generalized scotogenic model with large electroweak multiplets. we focus on scalar dark matter (dm) candidate of the model and compare dm annihilation cross sections to ww, zz, γγ and γz at present day in the galactic halo for scalar doublet and its immediate genera... | the sommerfeld enhancement in the scotogenic model with large electroweak scalar multiplets |
we consider a dark matter model with “active” component (annihilating or decaying), that forms a disk in the galaxy. in this work we calculate gamma-ray flux from the galactic center for given model and compare it to the observations. it was found that predicted flux with model parameters obtained in our last analysis ... | gamma-rays from possible disk component of dark matter |
the observed galactic 511 kev line has been interpreted in a number of papers as a possible signal of dark matter annihilation within the galactic bulge. if this is the case then it is possible that a similar spectral feature may be observed in association with nearby dwarf galaxies. these objects are believed to be st... | quark nugget dark matter: no contradiction with 511 kev line emission from dwarf galaxies |
the dampe experiment has recently reported an electron spectrum that can be explained by dark matter annihilation into charged lepton pairs in a nearby dark matter clump. the accompanying bremsstrahlung may yield a gamma-ray excess with a known spectral shape that extends over an angular scale of script o(10o). we show... | searching for light from a dark matter clump |
schwinger's idea about the magnetic world of the early universe, in which magnetic charges (monopoles) and magnetic atoms ( g + g -) could be formed, is developed. in the present-day universe magnetic charges with energies in the gev range can be formed in the magnetospheres of young pulsars in superstrong magnetic fie... | magnetic monopoles and dark matter |
we revisit the scalar singlet dark matter (dm) scenario with a pair of dark lepton partners which form a vectorlike dirac fermionic doublet. the extra doublet couples with the standard model (sm) leptonic doublet and the scalar singlet via a non-sm-like yukawa structure. as a result, (i) since the extra fermionic state... | multilepton signatures for scalar dark matter searches in coannihilation scenario |
using limits on photon flux from dwarf spheroidal galaxies, we place bounds on the parameter space of models in which dark matter annihilates into multiple final state particle pair channels. we derive constraints on effective operator models with dark matter couplings to third generation fermions and to pairs of stand... | indirect detection constraints on the model space of dark matter effective theories |
when comparing constraints on the weakly interacting massive particle (wimp) properties from direct and indirect detection experiments it is crucial that the assumptions made about the dark matter (dm) distribution are realistic and consistent. for instance, if the fermi-lat galactic center gev gamma-ray excess was due... | how to calculate dark matter direct detection exclusion limits that are consistent with gamma rays from annihilation in the milky way halo |
dark matter annihilation in dwarf spheroidal (dsph) galaxies near the milky way has the potential to produce a detectable signature in gamma-rays. the amplitude of this signal depends on the dark matter density in a dsph, the dark matter particle mass, the number of photons produced in an annihilation, and the possibly... | prospects for measuring dark matter microphysics with observations of dwarf spheroidal galaxies |
we present the first interpretation of the new isotropic diffuse gamma-ray background (igrb), measured by the fermi large area telescope (lat), based on a statistical analysis. we demonstrate that the gamma-ray emission from unresolved active galactic nuclei and star forming galaxies is consistent with the fermi-lat ig... | isotropic diffuse gamma-ray background: unveiling dark matter components beyond the contribution of astrophysical sources |
``searching for dark matter with cosmic gamma rays'' summarizes the evidence for dark matter and what we can learn about its particle nature using cosmic gamma rays. it has almost been 100 years since fritz zwicky first detected hints that most of the matter in the universe that doesn't directly emit or reflect light. ... | searching for dark matter with cosmic gamma rays |
the first bright objects to form in the universe might not have been 'ordinary' fusion-powered stars, but 'dark stars' (dss) powered by the annihilation of dark matter (dm) in the form of weakly interacting massive particles (wimps). if discovered, dss can provide a unique laboratory to test dm models. dss are born wit... | stability and pulsation of the first dark stars |
one loop correction to the dark matter (dm) annihilation cross section is usually assumed to be sub-dominate in calculating the dm relic density. in this paper, we propose a scenario where dm freezes out mainly via loops in the neutrino portal. for a scalar dm annihilating into neutrino via a triangle diagram, or a maj... | neutrino portal via loops |
in models of asymmetric dark matter (adm) the relic density is set by a particle asymmetry in an analogous manner to the baryons. here we explore the scenario in which adm decouples from the standard model thermal bath during an early period of matter domination. we first present a model independent analysis for a gene... | decoupling of asymmetric dark matter during an early matter dominated era |
we propose a new mechanism to communicate between fermion dark matter and the standard model (sm) only through the four-form flux. the four-form couplings are responsible for the relaxation of the higgs mass to the correct value and the initial displacement of the reheating pseudo-scalar field from the minimum. we show... | flux-mediated dark matter |
we consider the search for gamma rays produced by the annihilation or decay of low-mass dark matter which couples to quarks. in this scenario, most of the photons are produced from the decays of π0 or η mesons. these decays produce distinctly different photon signatures due to the difference in meson mass. we assess th... | indirect detection of low-mass dark matter through the π0 and η windows |
the uμνssm is a u(1)' extension of the μνssm supersymmetric model, where baryon-number-violating operators as well as explicit mass terms are forbidden, and the potential domain wall problem is avoided. the gauge anomaly-cancellation conditions impose the presence of exotic quark superfields in the spectrum of uμνssm m... | wimp dark matter in the uμνssm |
the aim of this paper is to highlight the challenges and potential gains surrounding a coherent description of physics from the high-energy scales of inflation down to the lower energy scales probed in particle-physics experiments. as an example, we revisit the way inflation can be realized within an effective minimal ... | mssm inflation revisited: toward a coherent description of high-energy physics and cosmology |
we present the first search for signatures of brane-world extra-dimensional dark matter (dm) in the very-high-energy gamma-ray band by scrutinizing observations of the dwarf spheroidal galaxy segue 1 with the major atmospheric gamma imaging cherenkov (magic) telescope system. branons are new degrees of freedom that app... | constraining branon dark matter from observations of the segue 1 dwarf spheroidal galaxy with the magic telescopes |
we study the complex structure of the bullet cluster radio halo to determine the dark matter (dm) contribution to the emission observed in the different subhaloes corresponding to the dm- and baryonic-dominated regions. we use different non-thermal models to study the different regions, and we compare our results with ... | is the radio emission in the bullet cluster due to dark matter annihilation? |
astrophysical searches for gamma rays are one of the main strategies to probe the annihilation or decay of dark matter particles. we present a new class of distinct sub-gev spectral features that generically appear in kinematical situations where the available center-of-mass energy in such processes is just above thres... | novel spectral features in mev gamma rays from dark matter |
we study the loop-induced circularly polarized gamma rays from dark matter annihilation using the effective dark matter theory approach. both neutral scalar and fermionic dark matter annihilating into monochromatic diphoton and z-photon final states are considered. to generate the circular polarization asymmetry, p and... | circularly polarized gamma rays in effective dark matter theory |
we promote the idea of multi-component dark matter (dm) to explain results from both direct and indirect detection experiments. in these models as contribution of each dm candidate to relic abundance is summed up to meet wmap/planck measurements of ωdm, these candidates have larger annihilation cross-sections compared ... | a possible explanation of low energy γ-ray excess from galactic centre and fermi bubble by a dark matter model with two real scalars |
the recent detection of a convective core in a main-sequence solar-type star is used here to test particular models of dark matter (dm) particles, those with masses and scattering cross sections in the range of interest for the dm interpretation of the positive results in several dm direct detection experiments. if dm ... | stellar convective cores as dark matter probes |
we propose a fermionic dark matter model by extending standard model with a dirac fermion and a real pseudoscalar. the fermion dark matter particle interacts with the standard model sector via the higgs portal through a dimension five interaction term as also through a pseudoscalar interaction term. the parameter space... | signatures of synchrotron radiation from the annihilation of dark matter at the galactic centre |
dark matter searches in gamma ray final states often make use of the fact that photons can be produced from final state muons. modern monte carlo generators and dark matter codes include the effects of final state radiation from muons produced in the dark matter annihilation process itself, but neglect the o (1 %) radi... | gamma rays from muons from wimps: implementation of radiative muon decays for dark matter analyses |
gamma ray observations have found evidence of an extremely energetic outflow emanating from the galactic centre, and an 'excess' of emission at gev energies towards the galactic centre over that expected from current models. determining whether the outflow is agn- or star formation-driven, and whether the 'excess' is a... | constraints on the distribution of gas and young stars in the galactic centre in the context of interpreting gamma ray emission features |
the observation of a special spectral feature in the gamma-ray data would be one of the best ways to identify dark matter (dm). the box-shaped gamma-ray spectra could be generated by the decay of intermediate particles produced by dm annihilation or decay. it provides another kind of signal that can be relatively easil... | study of the boxlike dark matter signals from dwarf spheroidal galaxies with fermi-lat data |
we consider a simple extension of the standard model with two singlet scalar fields and three heavy right-handed neutrinos. one of the scalar fields serves as an mev scale dark matter and its stability is ensured by the introduction of an extra z2 symmetry. the second scalar (which is even under the z2 symmetry) genera... | mev scale model of simp dark matter, neutrino mass and leptogenesis |
in their recent paper, chan and lee discuss an interesting possibility: radio continuum emission from a dwarf irregular galaxy may be used to constrain upper limits on the cross section of annihilating dark matter. they claim that the contributions from nonthermal and thermal emission can be estimated with such accurac... | comment on "constraining the annihilating dark matter mass by the radio continuum spectral data of the ngc4214 galaxy" |
in this article, we focus on new scalar ϕ mediated scalar/vectorial weakly interacting massive particles (wimps) with ϕ 's mass slightly below the wimp mass. to explain the galactic center 1-3 gev gamma-ray excess, here we consider the case that a wimp pair predominantly annihilates into an on-shell ϕ ϕ pair with ϕ mai... | study of wimp annihilations into a pair of on-shell scalar mediators |
we study spectral features in the gamma-ray emission from dark matter (dm) annihilation in the next-to-minimal supersymmetric standard model (nmssm), with either neutralino or right-handed (rh) sneutrino dm . we perform a series of scans over the nmssm parameter space, compute the dm annihilation cross section into two... | enhanced lines and box-shaped features in the gamma-ray spectrum from annihilating dark matter in the nmssm |
in the past decade, some telescopes [e.g. fermi-large area telescope (lat), alpha magnetic spectrometer(ams), and dark matter particle explorer(dampe)] were launched to detect the signals of annihilating dark matter in our galaxy. although some excess of gamma-rays, antiprotons, and electrons/positrons have been report... | a possible radio signal of annihilating dark matter in the abell 4038 cluster |
the core-cusp problem persists as an unresolved tension between the pre- dictions of λcdm cosmology and observations of dark matter (dm) profiles in dwarf spheroidal and other galaxies. we present a novel scenario for converting cusps into cores through reactivation of dm annihilation in galaxies at late times. this ca... | late-time dark matter oscillations and the core-cusp problem |
dark matter is one of the most important open problems in particle physics and cosmology. weakly interacting massive particles (wimps) appear as an appealing solution, providing the right relic density with a cross-section at the electroweak scale, however, no wimp signals were observed until now. secluded models are g... | indirect searches for secluded dark matter |
with ever increasing pressure from collider physics and direct detection experiments, particle physics models of tev scale dark matter are gaining more attention. in this work, we consider two realizations of the class of scalar portal dark matter scenarios - the inverse seesaw model and the inert doublet model. observ... | cta sensitivity on tev scale dark matter models with complementary limits from direct detection |
the unexplained excess gamma-ray emission from the milky way's galactic centre has puzzled astronomers for nearly a decade. two theories strive to explain the origin of this excess: self-annihilating dark matter particles or an unresolved population of radio millisecond pulsars. we examine the plausibility of a pulsar ... | millisecond pulsar kicks cause difficulties in explaining the galactic centre gamma-ray excess |
to reveal natures of the dark matter (dm) particles, a gamma-ray signal produced in annihilation processes of dm into the standard model particles has been one of the major probes. the cross-correlation between highly dm dominated structures, such as local dwarf galaxies, and observed photons in the direction of the st... | constraining dark matter annihilation with dark energy survey y3 lsbg sample |
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