abstract stringlengths 3 192k | title stringlengths 4 857 |
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we investigate models involving a vectorlike quark (x ), which forms a 750 gev bound state and reproduces the observed diphoton signals at the lhc, in connection with other excesses in the lhc data. an exotic hypercharge of -4 /3 is required to fit the signal cross section, which indicates that there is an additional p... | models of a 750 gev quarkonium and the lhc excesses |
the center of our galaxy is a complex region characterized by extreme phenomena. the presence of the supermassive sagittarius a* black hole, a high dark matter density and an even higher baryonic density are able to produce very energetic processes. indeed, high energetic gamma-rays have been observed by different tele... | antiproton signatures from astrophysical and dark matter sources at the galactic center |
measurements of the cross-correlation between the extragalactic gamma-ray background (egb) and large-scale structure provide a novel probe of dark matter on extragalactic scales. we focus on luminous red galaxies (lrgs) as optimal targets to search for the signal of dark matter annihilation. we measure the cross-correl... | cross-correlation of the extragalactic gamma-ray background with luminous red galaxies |
the positron annihilation to dark matter experiment (padme) was designed and constructed to search for dark photons ($a'$) in the process $e^+e^-\rightarrow\gamma a'$, using the positron beam at the beam test facility (btf) at the national laboratories of frascati (lnf). since the observation of an anomalous spectra in... | status and prospects of padme |
we propose a simple model in the type-iii seesaw framework to explain the neutrino mass, asymmetric dark matter, baryon asymmetry of the universe, and the recently reported w-mass anomaly by cdf-ii collaboration. we extend the standard model with a vector-like singlet lepton ($\chi$) and a hypercharge zero scalar tripl... | cogenesis of matter and dark matter from triplet fermion seesaw |
radio observations at multiple frequencies have detected a significant isotropic emission component between 22 mhz and 10 ghz, commonly termed the arcade-2 excess. the origin of this radio emission is unknown, as the intensity, spectrum and isotropy of the signal are difficult to model with either traditional astrophys... | cluster mergers and the origin of the arcade-2 excess |
we study the scenario of fermionic dark matter that annihilates to standard model fermions through an s-channel axial vector mediator. we point out that the well-known chirality suppression of the annihilation cross section can be alleviated by s-channel internal higgsstrahlung. the shapes of the cosmic ray spectra are... | dark matter annihilation with s-channel internal higgsstrahlung |
a toy-model with su(2)tc dynamics confined at high scales λtc ≫ 100gev enables to construct dirac uv completion from the original chiral multiplets predicting a vector-like nature of their weak interactions consistent with electroweak precision tests. in this work, we investigate a potential of the lightest scalar bary... | composite scalar dark matter from vector-like su(2) confinement |
around one-third of the point-like sources in the fermi-lat catalogues remain as unidentified sources (unids) today. indeed, these unids lack a clear, univocal association with a known astrophysical source. if dark matter (dm) is composed of weakly interacting massive particles (wimps), there is the exciting possibilit... | a search for dark matter among fermi-lat unidentified sources with systematic features in machine learning |
theλ cdm cosmological framework predicts the existence of thousands of subhalos in our own galaxy not massive enough to retain baryons and become visible. yet, some of them may outshine in gamma rays provided that the dark matter is made of weakly interacting massive particles (wimps), which would self-annihilate and w... | constraints to dark matter annihilation from high-latitude hawc unidentified sources |
low-surface-brightness galaxies (lsbgs) are interesting targets for searches of dark matter emission due to their low baryonic content. however, predicting their expected dark matter emissivities is difficult because of observational challenges in their distance measurements. here we present a stacking method that make... | dark matter constraints with stacked gamma rays scales with the number of galaxies |
we present a new open-source package, hazma 2, that computes accurate spectra relevant for indirect dark matter searches for photon, neutrino, and positron production from vector-mediated dark matter annihilation and for spin-one dark matter decay. the tool bridges across the regimes of validity of two state of the art... | hazma meets herwig4dm: precision gamma-ray, neutrino, and positron spectra for light dark matter |
we emphasize the distinctive cosmological dynamics in multi-component dark-matter scenarios and their impact on probing a sub-dominant component of dark matter. the dynamics originate from the conversion among different dark-matter components. we find that the temperature of the self-interacting sub-component dark matt... | manifesting hidden dynamics of a sub-component dark matter |
in this work, we study indirect photon signatures of leptophilic dark matter (dm) coming from centaurus a (cen a), where a dm density spike is believed to have survived to date contrary to the case of our galaxy. we consider a model where dm is a majorana fermion which interacts with right-handed electrons via a scalar... | signatures of leptophilic t -channel dark matter from active galactic nuclei |
the gev-scale gamma-ray excess observed from the region surrounding the galactic center has been interpreted as either the products of annihilating dark matter particles, or as the emission from a large population of faint and centrally located millisecond pulsars. if pulsars are responsible for this signal, then they ... | cherenkov telescope array will test whether pulsars generate the galactic center gamma-ray excess |
various mechanisms have been developed to explain the origin of neutrino masses. one of them is radiative mass generation. two-loop mass generation is of particular interest because the masses and couplings of new particles propagating in the loop can be in the range testable by other experiments and observations. in o... | two-loop snail diagrams: relating neutrino masses to dark matter |
in the scenario that dark matter (dm) is a weakly interacting massive particle, there are many possibilities of the interactions with the standard model (sm) particles to achieve the relic density of dm. in this paper, we consider a simple dm model where the dm candidate is a complex scalar boson. the model contains a ... | dark matter physics, flavor physics and lhc constraints in the dark matter model with a bottom partner |
dark matter self-interactions are a well-motivated solution to the core-vs.-cusp and the too-big-to-fail problems. they are commonly induced by means of a light mediator, that is also responsible for the dark matter freeze-out in the early universe. motivated by the fact that such scenario is excluded in its simplest r... | self-interacting dark matter as a solution to the problems in small-scale structures |
dark matter (dm) halos have long been known to be triaxial, but in studies of possible annihilation and decay signals they are often treated as approximately spherical. in this work, we examine the asymmetry of potential indirect detection signals of dm annihilation and decay, exploiting the large statistics of the hyd... | spherical cows in dark matter indirect detection |
cosmological simulations of the λcdm model suggest that the dark matter halos of dwarf galaxies are denser in their center than what observational data of such galaxies imply. in this letter, we propose a novel solution to this problem by invoking a certain class of dark matter self-heating processes. as we will argue,... | core formation from self-heating dark matter |
more than 1043 positrons annihilate every second in the centre of our galaxy yet, despite four decades of observations, their origin is still unknown. many candidates have been proposed, such as supernovae and low mass x-ray binaries. however, these models are difficult to reconcile with the distribution of positrons, ... | astrophysical signatures of leptonium |
using the gamma-ray telescope spi, the origin of positrons in the milky way was investigated by measuring high-resolution spectra of electron-positron annihilation as well as radioactive decay from beta-plus-unstable nuclei in space. the variety of positron source types and different annihilation regions in the galaxy ... | positron-annihilation spectroscopy throughout the milky way |
it has been long discussed that cosmic rays may contain signals of dark matter. in the last couple of years an anomaly of cosmic-ray positrons has drawn a lot of attentions, and recently an excess in cosmic-ray anti-proton has been reported by ams-02 collaboration. both excesses may indicate towards decaying or annihil... | constraining particle dark matter using local galaxy distribution |
dwarf spheroidal galaxies (dsphs) are promising targets of indirect detection experiments searching for dark matter (dm) at present universe. towards robust prediction for the amount of signal flux originating in dm annihilation inside dsphs, a precise determination of dm distributions as well as j-factors of the dsphs... | j-factor estimation of draco, sculptor, and ursa minor dwarf spheroidal galaxies with the member/foreground mixture model |
secluded dark matter is one of the most popular dark matter models, where dark matter annihilations go into particles that belong to a dark sector. an interesting way to probe such models is via indirect detection. in particular, gamma-ray observations are rather promising. taking into account 1% level of systematics, ... | secluded dark matter in light of the cherenkov telescope array (cta) |
dwarf spheroidal galaxies (dsphs) are promising targets for the gamma-ray dark matter (dm) search. in particular, dm annihilation signal is expected to be strong in some of the recently discovered nearby ultrafaint dsphs, which potentially give stringent constraints on the o(1) tev weakly interacting massive particle d... | foreground effect on the j-factor estimation of ultrafaint dwarf spheroidal galaxies |
milky way-like galaxies are predicted to host a very large number of dark matter subhalos. some massive and nearby subhalos could generate detectable gamma rays, appearing as unidentified, spatially extended and stable gamma-ray sources. we search for such sources in the third fermi large area telescope source list (3f... | 3fgl j1924.8-1034: a spatially extended stable unidentified gev source? |
we investigate the implications of the long-rang self-interaction on both the self-capture and the annihilation of the self-interacting dark matter (sidm) trapped in the sun. our discussion is based on a specific sidm model in which dm particles self-interact via a light scalar mediator, or yukawa potential, in the con... | long-range self-interacting dark matter in the sun |
the recently discovered object triangulum ii appears to be an ultrafaint dwarf spheroidal galaxy which may be one of the most dark-matter-dominated objects yet known. in this work we try to estimate the potential of this object for studies of the indirect detection of self-annihilating dark matter by obtaining its astr... | the potential of the dwarf galaxy triangulum ii for dark matter indirect detection |
the galactic center excess (gce) in gev gamma rays has been debated for over a decade, with the possibility that it might be due to dark matter annihilation or undetected point sources such as millisecond pulsars (msps). this study investigates how the gamma-ray emission model (γem) used in galactic center analyses aff... | mind the gap: the discrepancy between simulation and reality drives interpretations of the galactic center excess |
in the past decade, the properties of annihilating dark matter models were examined by various kinds of data, including the data of gamma-rays, radio waves, x-rays, positrons, electrons, antiprotons and neutrinos. in particular, most of the studies focus on the data of our galaxy, nearby galaxies (e.g., m31 galaxy) or ... | constraining annihilating dark matter mass by the radio continuum spectral data of a high-redshift galaxy cluster |
we consider dark matter annihilation into a general set of final states of standard model particles, including two-body and four-body final states that result from the decay of intermediate states. for dark matter masses ∼10 - 105 gev , we use updated data from planck and from high gamma-ray experiments such as fermi-l... | dark matter annihilation into four-body final states and implications for the ams antiproton excess |
in this work, we investigate a scenario in which heavy majorana right-handed neutrinos (rhns) are in thermal equilibrium with a dark sector with temperature higher than the standard model (sm) thermal bath. specifically, we consider the scenario in which thermal dark matter (dm) abundance is fixed from the freeze-out o... | hot leptogenesis from thermal dark matter |
standard model extensions with a strongly coupled dark sector can induce high-multiplicity states of soft quarks. such final states trigger extremely efficient antinucleus formation. we show that dark matter annihilation or decay into a strongly coupled sector can dramatically enhance the cosmic-ray antinuclei flux—by ... | cosmic ray antihelium from a strongly coupled dark sector |
traditionally, incorporating additional physics into existing cosmological simulations requires re-running the cosmological simulation code, which can be computationally expensive. we show that conditional generative adversarial networks (cgans) can be harnessed to predict how changing the underlying physics alters the... | a black box for dark sector physics: predicting dark matter annihilation feedback with conditional gans |
low surface brightness (lsb) galaxies have very diffuse, low surface density stellar discs that appear faint in optical images. they are very rich in neutral hydrogen (h i) gas, which extends well beyond the stellar discs. their extended h i rotation curves and stellar discs indicate that they have very massive dark ma... | multiwavelength analysis of low surface brightness galaxies to study possible dark matter signature |
we present the first branon dark matter (dm) search in the very high-energy gamma-ray band with observations of the dwarf spheroidal galaxy segue~1 carried out by the major atmospheric gamma imaging cherenkov (magic) telescope system. branons are new degrees of freedom that appear in flexible brane-world models corresp... | constraining branon dark matter from observations of the dwarf spheroidal galaxies with the magic telescopes |
the study of dark matter (dm) captured inside stars has proved to be a viable indirect search strategy complementary to other direct searches. however, in this context, only a fraction of the rich diversity of physics found in different types of stars has been explored, with most studies addressing main-sequence stars ... | asteroseismology of red clump stars as a probe of the dark matter content of the galaxy central region |
we present a review on the self-resonant dark matter scenarios where multiple components of dark matter give rise to a resonant condition in the $u$-channel diagrams for their comparable masses. in this case, there is no need of lighter mediators for enhancing the self-scattering and annihilation cross sections for dar... | self-resonant dark matter |
dark matter may consist of feebly interacting massive particles (fimps) that never thermalized with the cosmic plasma. their relic density is achieved via freeze-in for a wide range of masses, significantly expanding the model space that can be tested compared to other production mechanisms. however, testing the tiny c... | probing feebly interacting dark matter with monojet searches |
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 $\nu_4\to\nu_\ell\gamma$ decay rate, such that the nus... | revisiting (s)neutrino dark matter in natural susy |
the cmb observation sets stringent constraints on mev dark matter (dm) annihilating into charged states or photons in s waves, and the recent observation of the 21-cm absorption at the cosmic dawn reported by edges is also very strict for s -wave annihilations of mev dm. the millicharged dm with p -wave-dominant annihi... | possible s -wave annihilation for mev dark matter with the 21-cm absorption |
we consider an extension of classical stochastic reaction-diffusion (rd) dynamics to open quantum systems. we study a class of models of hard-core particles on a one-dimensional lattice whose dynamics is generated by a quantum master operator. particle hopping is coherent while reactions, such as pair annihilation or p... | open quantum reaction-diffusion dynamics: absorbing states and relaxation |
the non-observation of neutrinos by the icecube at the glashow resonance energy of 6.3 pev has been a long standing unresolved issue. in this paper we propose a t-channel neutrino absorption by the cνb, which causes a cutoff at 4.5 pev neutrino energy, to explain the icecube observations. we present a neutrinophilic 2h... | cutoff of icecube neutrino spectrum due to t-channel resonant absorption by cνb |
we investigate the role of the higgs doublet in the thermal decoupling of multi-tev dark matter coupled to the weak interactions of the standard model and the higgs. the higgs doublet can mediate a long-range force that affects the annihilation processes and binds dark matter into bound states. more importantly, the em... | bound states of wimp dark matter in higgs-portal models. part i. cross-sections and transition rates |
we introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. this spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two dirac fermions, which subsequently decay in flight into another fermion and a photon. the resulting photon spectru... | gamma-ray triangles: a possible signature of asymmetric dark matter in indirect searches |
we examine the projected ability to reconstruct the mass, scattering, and annihilation cross section of dark matter in the new generation of large underground detectors, xenon-1t, supercdms, and darkside-g2, in combination with diffuse gamma radiation from expected 15 years of data from fermi-lat observation of 46 loca... | reconstructing wimp properties through an interplay of signal measurements in direct detection, fermi-lat, and cta searches for dark matter |
we study the kinetic decoupling of light (lesssim 10 gev) magnetic dipole dark matter (dm) . we find that present bounds from collider, direct dm searches, and structure formation allow magnetic dipole dm to remain in thermal equilibrium with the early universe plasma until as late as the electron-positron annihilation... | late kinetic decoupling of light magnetic dipole dark matter |
m31 and m33 are the closest spiral galaxies and the largest members (together with the milky way) of the local group, which makes them interesting targets for indirect dark matter searches. in this paper we present studies of the expected sensitivity of the cherenkov telescope array (cta) to an annihilation signal from... | prospects for annihilating dark matter from m31 and m33 observations with the cherenkov telescope array |
in this paper we study the presence of generalized blind spots, i.e. regions of the parameter space where the spin-independent cross section for dark matter direct detection is suppressed, in the context of a generic 2hdm and a minimal fermionic higgs-portal dark sector. to this end, we derive analytical expressions fo... | generalized blind spots for dark matter direct detection in the 2hdm |
we show that a general semi-annihilation scenario, in which a pair of dark matter (dm) particles annihilate to an anti-dm, and an unstable state that can mix with or decay to standard model states, can lead to particle anti-particle asymmetry in the dm sector. the present dm abundance, including the cp-violation in the... | asymmetric dark matter from semi-annihilation |
the positron excess observed by pamela and then confirmed by ams-02 has intrigued the particle physics community since 2008. various dark matter decay and annihilation models have been built to explain the excess. however, the bounds from isotropic gamma ray disfavor the canonical dark matter decay scenario. we propose... | dark matter decaying into millicharged particles as a solution to ams-02 positron excess |
we explore the non-commutative space-time to revive the idea that gamma-ray excess in the galactic center can be the result of particle dark matter annihilation. in the non-commutative theory, the photon spectrum is produced by direct emission during this annihilation where a photon can be embed in the final state toge... | singlet scalar dark matter in the non-commutative space-time: a viable hypothesis to explain the gamma-ray excess in the galactic center |
data from planck measurements of the cosmic microwave background (cmb) place important constraints on models with light dark matter (dm) and light mediators especially when both lie in the mass range below ∼ 1 gev. in models involving kinetic mixing where the dark photon acts as the mediator, these constraints are easi... | dark initial state radiation and the kinetic mixing portal |
fermi-lat observations have strongly constrained dark matter annihilation through the joint-likelihood analysis of dwarf spheroidal galaxies (dsphs). these constraints are expected to be robust because dsphs have measurable dark matter content and produce negligible astrophysical emission. however, each dsph is dim, wi... | robust method for treating astrophysical mismodeling in dark matter annihilation searches of dwarf spheroidal galaxies |
we for the first time provide self-consistent axisymmetric phase-space distribution models for the milky way's dark matter (dm) halo which are carefully matched against the latest kinematic measurements through bayesian analysis. by using broad priors on the individual galactic components, we derive conservative estima... | equilibrium axisymmetric halo model for the milky way and its implications for direct and indirect dark matter searches |
the cosmology of a standard model gauge singlet complex scalar dark matter (dm), stabilized by a reflection symmetry, is studied, including all renormalizable interactions that preserve the reflection symmetry but can break the larger global u (1 ) symmetry of the dm number. we find an interesting interplay of the ensu... | cosmology of complex scalar dark matter: interplay of self-scattering and annihilation |
in the absence of any hints of new physics in lhc, tev dark matter candidates interacting through electroweak force (ewdm) are still highly motivated. we extend the standard model by adding an arbitrary su(2) dm multiplet in non-chiral representation. in addition to the well-known real representation which has no coupl... | electroweak dark matter |
about a third of the γ-ray sources detected by the fermi large area telescope (fermi-lat) remain unidentified, and some of these could be exotic objects such as dark matter subhalos. we present a search for these sources using bayesian neural network classification methods applied to the latest 4fgl-dr3 fermi-lat catal... | searching for dark matter subhalos in the fermi-lat catalog with bayesian neural networks |
dark matter self-scattering is one of key ingredients for small-scale structure of the universe, while dark matter annihilation is important for the indirect measurements. there is a strong correlation between the velocity-dependent self-scattering cross section and the sommerfeld enhancement factor for the dark matter... | quantum theory of dark matter scattering |
the hyper-kamiokande (hyperk) experiment is expected to precisely measure the diffuse supernova neutrino background (dsnb). this requires that the backgrounds in the relevant energy range are well understood. one possible background that has not been considered thus far is the annihilation of low-mass dark matter (dm) ... | dark matter pollution in the diffuse supernova neutrino background |
"portal" models that connect the standard model to a dark sector allow for a wide variety of scenarios beyond the simplest wimp models. kinetic mixing of gauge fields in particular has allowed a broad range of new ideas. however, the models that evade cmb constraints are often non-generic, with new mass scales and oper... | a portalino to the dark sector |
some recent studies have examined the gamma-ray flux profile of our galaxy to determine the signal of dark matter annihilation. however, the results are controversial and no confirmation is obtained. in this article, we study the radio flux density profile of the m31 galaxy and show that it could manifest a possible si... | analysing the radio flux density profile of the m31 galaxy: a possible dark matter interpretation |
if two annihilation products of dark matter (dm) particles are non-relativistic and couple to a light force mediator, their plane wave functions are modified due to multiple exchanges of the force mediator. this gives rise to the final state sommerfeld (fss) effect. it is also possible that the final state particles fo... | final bound-state formation effect on dark matter annihilation |
the installation of forward detectors in cms and atlas turn the lhc into an effective photon-photon collider. the elastic scattering of the beam protons via the emission of photons, which can be identified by tagging the intact protons in the forward detectors, provides a powerful diagnostic of the central production o... | constraining the monochromatic gamma-rays from dark matter annihilation by the lhc |
we have recently introduced a novel statistical measure of dark matter clustering in phase space, the particle phase-space average density (p2sad). in a two-paper series, we studied the structure of p2sad in the milky way-size aquarius haloes, constructed a physically motivated model to describe it, and illustrated its... | universal clustering of dark matter in phase space |
recent radio-frequency probes, with the atca and askap telescopes, have proven themselves to be at the forefront of placing indirect limits on the properties of dark matter. the latter being able to substantially exceed the constraining power of fermi-lat data. however, these observations were based only on dwarf galax... | galaxy clusters in high definition: a dark matter search |
it is shown that the generators of clifford algebras behave as creation and annihilation operators for fermions and bosons. they can create extended objects, such as strings and branes, and can induce curved metric of our spacetime. at a fixed point, we consider the clifford algebra $cl(8)$ of the 8-dimensional phase s... | quantized fields à la clifford and unification |
we study the probability for nucleation of quark matter droplets in the dense cold cores of old neutron stars induced by the presence of a self-annihilating dark matter component, χ . using a parametrized form of the equation of state for hadronic and quark phases of ordinary matter, we explore the thermodynamical cond... | dark matter and bubble nucleation in old neutron stars |
models of fermion and scalar dark matter abound. here we consider instead vector dark matter, from an su(2)n extension of the standard model. it has a number of interesting properties, including a possible implementation of the inverse seesaw mechanism for neutrino mass. the annihilation of dark matter for calculating ... | su(2)n model of vector dark matter with a leptonic connection |
we propose a novel mechanism enabling us to have a continuum bump as a signature of gamma-ray excess in indirect detection experiments of dark matter (dm), postulating a generic dark sector having (at least) two dm candidates. with the assumption of non-zero mass gap between the two dm candidates, the heavier one direc... | energy peak: back to the galactic center gev gamma-ray excess |
we present methods to assess whether gamma-ray excesses towards milky way dwarf galaxies can be attributed to astrophysical sources rather than to dark matter annihilation. as a case study we focus on reticulum ii, the dwarf which shows the strongest evidence for a gamma-ray signal in fermi data. dark matter models and... | astrophysical explanations of suspected dark matter signals in dwarf galaxies |
recent gamma-ray and anti-proton analyses suggest that dark matter with mass m = 48 - 67 gev annihilating via b b ¯ channel can explain the galactic center gev gamma-ray excess and the anti-proton excess as measured by ams-02 simultaneously. in this article, by differentiating the contributions of dark matter annihilat... | fitting dark matter mass with the radio continuum spectral data of the ophiuchus cluster |
we present a novel mechanism for sommerfeld enhancement for dark matter interactions without the need for light mediators. considering a model for two-component dark matter with a triple coupling, we find that one of dark matter particles leads to an u-channel resonance in dark matter elastic scattering. from the sum o... | self-resonant dark matter |
we investigate the impact of energy released from self-annihilating dark matter (dm) on heating of gas in the small, high-redshift dm haloes thought to host the first stars. a supersymmetric (susy)-neutralino-like particle is implemented as our dm candidate. the pythia code is used to model the final, stable particle d... | dark matter annihilation in the first galaxy haloes |
the one-point function (i.e., the isotropic flux distribution) is a complementary method to (anisotropic) two-point correlations in searches for a gamma-ray dark matter annihilation signature. using analytical models of structure formation and dark matter halo properties, we compute the gamma-ray flux distribution due ... | modelling the flux distribution function of the extragalactic gamma-ray background from dark matter annihilation |
we use a monte carlo code to calculate the geodesic orbits of test particles around kerr black holes, generating a distribution function of both bound and unbound populations of dark matter (dm) particles. from this distribution function, we calculate annihilation rates and observable gamma-ray spectra for a few simple... | the distribution and annihilation of dark matter around black holes |
we apply the operator product expansion (ope) technique to the decay and annihilation of heavy particles in a thermal medium with temperature below the heavy particle mass, m χ. this allows us to explain two interesting observations made before: a) that the leading thermal correction to the decay width of a charged par... | finite-temperature modification of heavy particle decay and dark matter annihilation |
using a simple analytic formalism, we demonstrate that significant dark matter self-interactions produce halo cores that obey scaling relations nearly independent of the underlying particle physics parameters such as the annihilation cross section and the mass of the dark matter particle. for dwarf galaxies, we predict... | scaling relations of halo cores for self-interacting dark matter |
the galactic center γ -ray excess, detected by the fermi-lat, is a very attractive tentative signal from dark matter annihilation. searching for associated synchrotron emissions can test the dark matter interpretation for this excess. we geared the five-hundred-meter aperture spherical radio telescope (fast) toward com... | constraints on dark matter annihilation from the fast observation of the coma berenices dwarf galaxy |
a natural consequence of the galaxy formation paradigm is the existence of supermassive black hole (smbh) binaries. gravitational perturbations from a far-away smbh companion can induce high orbital eccentricities on dark matter (dm) particles orbiting the primary smbh via the eccentric kozai-lidov mechanism. this proc... | dark matter signatures of supermassive black hole binaries |
numerical simulations show that the dark matter halos surrounding galaxies are expected to contain many over-densities or sub-halos. the most massive of these sub-halos can be optically observed in the form of dwarf galaxies. however, most lower mass sub-halos are predicted to exist as dark dwarf galaxies: sub-halos li... | searching for dark matter sub-structure with hawc |
we study a simple complex scalar singlet dark matter (dm) model with $z_3$ symmetry in the framework of type-ii seesaw mechanism. we use the model to explain the excess of electron-positron flux measured by ams-02, dampe and fermi-lat collaborations, which is encouraged by the decay of the triplets produced from dark m... | scalar dark matter with $z_3$ symmetry in type-ii seesaw |
r-parity conserving supersymmetric models with right-handed (rh) neutrinos are very appealing since they could naturally explain neutrino physics and also provide a good dark matter (dm) candidate such as the lightest supersymmetric particle (lsp). in this work we consider the next-to-minimal supersymmetric standard mo... | dark matter candidates in the nmssm with rh neutrino superfields |
in the minimal supersymmetric standard model light neutralinos can satisfy the dark matter (dm) abundance constraint by resonant annihilation via a $z$ or a light higgs ($h$) boson. in this work we study the current and future status of this scenario by investigating relevant experimental constraints, including dm dire... | constraining resonant dark matter with combined lhc electroweakino searches |
if captured by the gravitational field of stars or other compact objects, dark matter can self-annihilate and produce a potentially detectable particle flux. in the case of superheavy dark matter ( mx gtrsim 108 gev), a large number of scattering events with nuclei inside stars are necessary to slow down the dark matte... | multiscatter capture of superheavy dark matter by pop iii stars |
the fermi-lat collaboration has studied the gamma-ray emission from a stacked population of dwarf spheroidal galaxies and used this information to set constraints on the dark matter annihilation cross section. interestingly, their analysis uncovered an excess with a test statistic (ts) of 8.7. if interpreted naively, t... | improving the sensitivity of gamma-ray telescopes to dark matter annihilation in dwarf spheroidal galaxies |
we propose a simple scenario that directly connects the dark matter (dm) and neutrino mass scales. based on an interaction between the dm particle χ and the neutrino ν of the form χ χ ν ν /λ2, the dm annihilation cross section into the neutrino is determined and a neutrino mass is radiatively induced. using the observe... | dark matter origins of neutrino masses |
when rotating classical fluid drops merge together, angular momentum can be advected from one to another due to the viscous shear flow at the drop interface. it remains elusive what the corresponding mechanism is in inviscid quantum fluids such as bose-einstein condensates (becs). here we report our theoretical study o... | torque and angular-momentum transfer in merging rotating bose-einstein condensates |
using neutron stars (ns) as a dark matter (dm) probe has gained broad attention recently; either from heating due to dm annihilation or its stability under the presence of dm. in this work, we investigate spin-1 /2 fermionic dm χ charged under the u (1 )x in the dark sector. the massive gauge boson v of u (1 )x gauge g... | exploring dark sector parameters in light of neutron star temperatures |
the presence of an excess γ -ray signal toward the galactic center (gc) has now been well established, and is known as the gc excess. leading explanations for the signal include mismodeling of the galactic diffuse emission along the line of sight, an unresolved population of millisecond pulsars, and/or the annihilation... | dark matter explanations of the gamma-ray excesses from the galactic center and m31 |
we study a class of six-dimensional models based on positive curvature surfaces (spherical 2-orbifolds) as extra-spaces. using the newman-penrose formalism, we discuss the particle spectrum in this class of models. the fermion spectrum problem, which has been addressed with flux compactifications in the past, can be av... | dark matter and localised fermions from spherical orbifolds? |
we revisit the thermal majorana dark matter from the viewpoint of the minimal effective field theory. in this framework, analytical results for dark matter annihilation into standard model particles are derived. the dark matter parameter space, subject to the latest lux, pandax-ii and xenon-1t limits, is presented in a... | effective field theory of the majorana dark matter |
among the most stringent constraints on the dark matter annihilation cross section are those derived from observations of dwarf galaxies by the fermi gamma-ray space telescope. as current (e.g., dark energy survey, des) and future (large synoptic survey telescope, lsst) optical imaging surveys discover more of the milk... | prospects for detecting gamma rays from annihilating dark matter in dwarf galaxies in the era of the dark energy survey and large synoptic survey telescope |
in the last decades a vaste amount of evidence for the existence of dark matter has been accumulated. at the same time, many efforts have been undertaken to try to identify what dark matter is. indirect searches look at places in the universe where dark matter is believed to be abundant and seek for possible annihilati... | the dark matter programme of the cherenkov telescope array |
in this talk, we discuss the physics modeling of antiproton spectra arising from dark matter (dm) annihilation or decay in a model-independent manner. the modeling of antiproton spectra contains some intrinsic uncertainties related to qcd parton showers and hadronisation of baryons. we briefly assess the sources of the... | estimating qcd uncertainties on antiproton spectra from dark-matter annihilation |
semi-annihilation is a generic feature of dark matter theories stabilized by symmetries larger than a &z; 2. it contributes to thermal freeze out, but is irrelevant for direct and collider searches. this allows semi-annihilating dark matter to avoid those limits in a natural way. we use an effective operator approach t... | a systematic effective operator analysis of semi-annihilating dark matter |
a statistically significant excess of gamma rays has been reported and robustly confirmed in the galactic center over the past decade. large local dark matter densities suggest that this galactic center excess (gce) may be attributable to new physics, and indeed it has been shown that this signal is well-modelled by an... | a closer look at cp-violating higgs portal dark matter as a candidate for the gce |
we use the suite of milky way-like galaxies in the auriga simulations to determine the contribution to annihilation radiation from dark matter subhalos in three velocity-dependent dark matter annihilation models: sommerfeld, p-wave, and d-wave models. we compare these to the corresponding distribution in the velocity-i... | velocity-dependent annihilation radiation from dark matter subhalos in cosmological simulations |
we explore a gauged u(1) b - l extension of the standard model with inclusion of three right-handed neutrinos of exotic b - l charges to cancel the gauge anomaly. non-trivial transformation of new particles under b - l symmetry forbids the generation of neutrino mass at tree level and hence a small dirac mass can be ge... | scalar dark matter and radiative dirac neutrino mass in an extended u(1)b-l model |
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