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decaying or annihilating dark matter particles could be detected through gamma-ray emission from the species they decay or annihilate into. this is usually done by modeling the flux from specific dark matter-rich objects such as the milky way halo, local group dwarfs, and nearby groups. however, these objects are expec... | constraints on dark matter annihilation and decay from the large-scale structure of the nearby universe |
cold dark matter haloes consist of a relatively smooth dark matter component as well as a system of bound subhaloes. it is the prevailing practice to include all mass, including mass in subhaloes, in studies of halo density profiles in simulations. however, often in observational studies satellites are treated as havin... | illuminating dark matter halo density profiles without subhaloes |
given the recent constraints from the dark matter (dm) direct detections, we examine a light gev-scale (2-30 gev) neutralino dm in the alignment limit of the minimal supersymmetric standard model (mssm). in this limit without decoupling, the heavy cp-even scalar h plays the role of the standard model (sm) higgs boson w... | probing gev-scale mssm neutralino dark matter in collider and direct detection experiments |
we update indirect constraints on electro-weak dark matter (ewdm) considering the sommerfeld-ramsauer-townsend (srt) effect for its annihilations into a pair of standard model gauge bosons assuming that ewdm accounts for the observed dark matter (dm) relic density for a given dm mass and mass gaps among the multiplet c... | electro-weak dark matter: non-perturbative effect confronting indirect detections |
if a component of dark matter has dissipative interactions, it can cool to form compact astrophysical objects with higher density than that of conventional cold dark matter (sub)haloes. dark matter annihilations might then appear as point sources, leading to novel morphology for indirect detection. we explore dissipati... | point sources from dissipative dark matter |
we discuss the o (αs) supersymmetric qcd corrections to neutralino-stop coannihilation into a top quark and a gluon in the minimal supersymmetric standard model (mssm). this particular channel can be numerically important in wide ranges of the mssm parameter space with rather light stops. we discuss technical details s... | one-loop corrections to neutralino-stop coannihilation revisited |
freeze-out or freeze-in during a period of early matter domination can yield the correct dark matter abundance for small values of the velocity-averaged annihilation cross section, ⟨σannv ⟩f<3 ×10-26 cm3 s-1 . however, in a generic nonstandard thermal history, such a period is typically preceded by other phases. her... | freeze-in production of dark matter prior to early matter domination |
we report on a search for monochromatic γ-ray features in the spectra of galaxy clusters observed by the fermi large area telescope. galaxy clusters are the largest structures in the universe that are bound by dark matter (dm), making them an important testing ground for possible self-interactions or decays of the dm p... | search for gamma-ray lines towards galaxy clusters with the fermi-lat |
cold dark matter (dm) models for structure formation predict that dm subhalos are present in the galaxy. in the standard paradigm of dm as weakly interacting massive particle, subhalos are expected to shine in gamma rays and to provide a signal detectable with current instruments, notably with the large area telescope ... | investigating the detection of dark matter subhalos as extended sources with fermi-lat |
we estimate the conventional astrophysical emission from dwarf spheroidal satellite galaxies (dsphs) of the milky way (mw), focusing on millisecond pulsars (msps), and evaluate the potential for confusion with dark matter (dm) annihilation signatures at gev energies. in low-density stellar environments, such as dsphs, ... | estimating the gev emission of millisecond pulsars in dwarf spheroidal galaxies |
we demonstrate that the tentative detection of a few antihelium events with the alpha magnetic spectrometer (ams) on board the international space station can, in principle, be ascribed to the annihilation or decay of galactic dark matter, when accounting for uncertainties in the coalescence process leading to the form... | origin of the tentative ams antihelium events |
we perform a composite likelihood analysis of subdivided regions within the central 26° × 20° of the milky way, with the aim of characterizing the spectrum of the gamma-ray galactic center excess in regions of varying galactocentric distance. outside of the innermost few degrees, we find that the radial profile of the ... | investigating the uniformity of the excess gamma rays towards the galactic center region |
we explore regions of parameter space that give rise to suppressed direct detection cross sections in a simple model of scalar dark matter with a scalar portal that mixes with the standard model higgs. we found that even this simple model allows considerable room in the parameter space that has not been excluded by dir... | exploring direct detection suppressed regions in a simple 2-scalar mediator model of scalar dark matter |
${\rm u(1)}_{l_\mu - l_\tau} \equiv {\rm u(1)}_x$ model is anomaly free within the standard model (sm) fermion content, and can accommodate the muon $(g-2)$ data for $m_{z'} \sim o(10-100)$ mev and $g_x \sim (4 - 8) \times 10^{-4}$. wimp type thermal dark matter (dm) can be also introduced for $m_{z'} \sim 2 m_{\rm dm}... | muon $(g-2)$ and thermal wimp dm in ${\\rm u(1)}_{l_\\mu-l_\\tau} $ models |
resonant torques couple stellar bars to dark matter halos. here we use high-resolution numerical simulations to demonstrate long-term angular momentum transfer between stellar bars and dark matter orbits of varying orientation. we show that bar-driven reversals of dark matter orbit orientations can play a surprisingly ... | the coupling of galactic dark matter halos with stellar bars |
we study the impact of a modified expansion rate on the dark matter relic abundance in a class of scalar-tensor theories. the scalar-tensor theories we consider are motivated from string theory constructions, which have conformal as well as disformally coupled matter to the scalar. we investigate the effects of such a ... | dark matter relics and the expansion rate in scalar-tensor theories |
the smallest dark matter haloes are the first objects to form in the hierarchical structure formation of cold dark matter (cdm) cosmology and are expected to be the densest and most fundamental building blocks of cdm structures in our universe. nevertheless, the physical characteristics of these haloes have stayed illu... | concentration, ellipsoidal collapse, and the densest dark matter haloes |
shortly after the discovery of the kerr metric in 1963, it was realized that a region existed outside of the black hole's event horizon where no time-like observer could remain stationary. in 1969, roger penrose showed that particles within this ergosphere region could possess negative energy, as measured by an observe... | the collisional penrose process |
this work evaluates the viability of polyimide and parylene-c for passivation of lithium-drifted silicon (si(li)) detectors. the passivated si(li) detectors will form the particle tracker and x-ray detector of the general antiparticle spectrometer (gaps) experiment, a balloon-borne experiment optimized to detect cosmic... | passivation of si(li) detectors operated above cryogenic temperatures for space-based applications |
we propose a new scenario that both the dark matter freeze-out in the early universe and its possible annihilation for indirect detection around a supermassive black hole are enhanced by a breit-wigner resonance. with the mediator mass larger than the total initial dark matter mass, this annihilation is almost forbidde... | dark matter annihilation via breit-wigner enhancement with heavier mediator |
we use the weakly interacting massive particle (wimp) thermal decoupling scenario to probe cosmologies in dilatonic einstein gauss-bonnet (degb) gravity, where the gauss-bonnet term is non-minimally coupled to a scalar field with vanishing potential. we put constraints on the model parameters when the ensuing modified ... | wimps in dilatonic einstein gauss-bonnet cosmology |
we explore the phenomenology of qcd axion and axionlike particle (alp) dark matter production via misalignment during inflationary reheating. we investigate scenarios involving inflaton oscillating in a generic potential ∼ϕn, considering inflaton decay and annihilation for reheating. for low reheating temperatures, the... | constraining axion and alp dark matter from misalignment during reheating |
our earlier put forward model of dark matter, consisting of cm-size pearls with ordinary matter inside under high pressure and with a mass of order $1.4 *10^8$ kg, is used to explain the mysterious 3.5 kev x-ray line from the galactic center and various galaxies and galaxy clusters. the pearls are bubbles of a new type... | the 3.5 kev line from non-perturbative standard model dark matter balls |
the galactic center gamma-ray excess has a spectrum, angular distribution, and overall intensity that agree remarkably well with that expected from annihilating dark matter particles in the form of a $m_x \sim 50 \, {\rm gev}$ thermal relic. previous claims that these photons are clustered on small angular scales or tr... | the status of the galactic center gamma-ray excess |
strong coulomb interaction in monolayer transition metal dichalcogenides can facilitate nontrivial many-body effects among excitonic complexes. many-body effects such as exciton-exciton annihilation have been widely explored in this material system. however, a similar effect for charged excitons (or trions), that is, t... | trion-trion annihilation in monolayer ws2 |
we show that the present-day dark matter abundance can be produced through a novel mechanism that involves a very rapid thermal freeze-out caused by inhomogeneous heating and successive fast cooling of small fireballs in the early universe. the fireballs can be produced from energy deposited in small scale structure gr... | defrosting and blast freezing dark matter |
we test the consistency of dark matter velocity distributions obtained from dark matter-only numerical simulations with analytic predictions, using the publicly available via lactea 2 dataset as an example. we find that, well inside the scale radius, the velocity distribution obtained from numerical simulation is consi... | dark matter velocity distributions: comparing numerical simulations to analytic results |
the decay or annihilation of dark matter particles may produce a steady flux of very-high-energy gamma rays detectable above the diffuse background. nearby clusters of galaxies provide excellent targets to search for the signatures of particle dark matter interactions. in particular, the virgo cluster spans several deg... | search for decaying dark matter in the virgo cluster of galaxies with hawc |
we present updated constraints on 'light' dark matter (dm) particles with masses between 1 mev and 5 gev. in this range, we can expect dm-produced $e^\pm$ pairs to up-scatter low-energy ambient photons in the milky way via the inverse compton process, and produce a flux of x-rays that can be probed by a range of space ... | x-rays constraints on sub-gev dark matter |
electrons and positrons produced in dark matter annihilation can generate secondary emission through synchrotron and ic processes, and such secondary emission provides a possible means to detect dm particles with masses beyond the detector's energy band. the secondary emission of heavy dark matter (hdm) particles in th... | constraints on the annihilation of heavy dark matter in dwarf spheroidal galaxies with gamma-ray observations |
global fits explore different parameter regions of a given model and apply constraints obtained at many energy scales. this makes it challenging to perform global fits of simplified models, which may not be valid at high energies. in this study, we derive a unitarity bound for a simplified vector dark matter model with... | global fits of simplified models for dark matter with gambit |
the standard approach of calculating the relic density of thermally produced dark matter based on the assumption of kinetic equilibrium is known to fail for forbidden dark matter models since only the high momentum tail of the dark matter phase space distribution function contributes significantly to dark matter annihi... | forbidden dark matter annihilation into leptons with full collision terms |
a number of groups have employed radio observations of the galactic center to derive stringent constraints on the annihilation cross section of weakly interacting dark matter. in this paper, we show that electron energy losses in this region are likely to be dominated by inverse compton scattering on the interstellar r... | a critical reevaluation of radio constraints on annihilating dark matter |
we propose a new mechanism for rendering dark matter self-interacting in the presence of a massive spin-2 mediator. the derived yukawa-type potential for dark matter is independent of the spins of dark matter in the leading order of the momentum expansion, so are the resulting non-perturbative effects for the dark matt... | dark matter self-interactions from spin-2 mediators |
the generic expectation in string/supergravity models is that there are multiple moduli fields with masses of the order of the supersymmetry breaking scale. we study the cosmology that arises as a result of vacuum misalignment of these moduli fields (in contrast to previous studies which mostly focussed on the single m... | cosmology in the presence of multiple light moduli |
we study the effects of modifying the expansions history of the universe on dark matter freeze-out. we derived a modified boltzmann equation for freeze-out for an arbitrary energy density in the early universe and provide an analytic approach using some approximations. we then look at the required thermally averaged cr... | dark matter freeze-out in modified cosmological scenarios |
gamma-ray lines from dark matter annihilation (χχ → γx, where x = γ, h, z) are always accompanied, at lower energies, by a continuum gamma-ray spectrum stemming both from radiative corrections (x = γ) and from the decay debris of the second particle possibly present in the final state (x = h, z). this model-independent... | extending fermi-lat and h.e.s.s. limits on gamma-ray lines from dark matter annihilation |
the gamma-ray excess observed by the fermi-lat in the galactic center can be interpreted by the dark matter annihilation to b b ¯ via a light pseudoscalar in the next-to-minimal supersymmetric standard model (nmssm). it is interesting to note that the corresponding singlet scalar is useful to achieve a strongly first-o... | interpretation of the galactic center excess and electroweak phase transition in the nmssm |
the γ -ray observation of dwarf spheroidal satellites (dsph's) is an ideal approach for probing the dark matter (dm) annihilation signature. the latest fermi-lat dsph searches have set stringent constraints on the velocity independent annihilation cross section in the small dm mass range, which gives very strong constr... | constraint on the velocity dependent dark matter annihilation cross section from fermi-lat observations of dwarf galaxies |
thermal pair annihilation of heavy particles, such as dark matter or its co-annihilation partners, can be strongly influenced by attractive interactions. we investigate the case that pair annihilation proceeds through a velocity-suppressed p-wave operator, in the presence of an su(3) gauge force. making use of a non-re... | studies of a thermally averaged p-wave sommerfeld factor |
we examine a real electroweak triplet scalar field as dark matter, abandoning the requirement that its relic abundance is determined through freeze out in a standard cosmological history (a situation which we refer to as a 'miracle-less wimp'). we extract the bounds on such a particle from collider searches, searches f... | is a miracle-less wimp ruled out? |
the cosmic electron energy spectrum recently observed by the dampe experiment exhibits two interesting features, including a break around 0.9 tev and a sharp resonance near 1.4 tev. in this analysis, we propose a dark matter explanation to both exotic features seen by dampe. in our model, dark matter annihilates in the... | two-mediator dark matter models and cosmic electron excess |
in this work we perform an analysis of the recent ams-02 antiproton flux and the antiproton-to-proton ratio in the framework of simplified dark matter models. to predict the ams-02 observables we adopt the propagation and injection parameters determined by the observed fluxes of nuclei. we assume that the dark matter p... | simplified dark matter models in the light of ams-02 antiproton data |
we determine the dark matter pair-wise relative velocity distribution in a set of milky way-like halos in the auriga and apostle simulations. focusing on the smooth halo component, the relative velocity distribution is well-described by a maxwell-boltzmann distribution over nearly all radii in the halo. we explore the ... | velocity-dependent j-factors for annihilation radiation from cosmological simulations |
a higgs portal dark matter model for explaining the gamma ray excess from the galactic center can be realized with the extension of local s u (2 )x gauge symmetry with one quadruplet. due to the residual z3 discrete symmetry of s u (2 )x, the new gauge bosons are the stable dark matter candidates. due to the mixture of... | searching for vector dark matter via higgs portal at the lhc |
the relic abundance of the dark matter (dm) particle d is studied in a secluded dm scenario, in which the d number decreasing process dominantly occurs not through the pair annihilation of d into the standard model particles, but via the d d →m m scattering process with a subsequently decaying mediator particle m . it ... | relic abundance in a secluded dark matter scenario with a massive mediator |
we propose a new thermal freeze-out mechanism for ultraheavy dark matter. dark matter coannihilates with a lighter unstable species that is nearby in mass, leading to an annihilation rate that is exponentially enhanced relative to standard weakly interactive massive particles. this scenario destabilizes any potential d... | dark matter coannihilation with a lighter species |
accurate models of the structural evolution of dark matter subhaloes, as they orbit within larger systems, are fundamental to understanding the detailed distribution of dark matter at the present day. numerical simulations of subhalo evolution support the idea that the mass-loss associated with tidal stripping is most ... | a universal model for the evolution of tidally stripped systems |
if dark matter annihilates with a velocity-dependent cross section within a subhalo, then the magnitude and angular distribution of the resulting photon signal will change. these effects are encoded in the j -factor. in this work we compute the j -factor for a variety of choices for the cross section velocity dependenc... | j -factors for velocity-dependent dark matter annihilation |
the wimp dark matter (dm) hypothesis now is in an awkward position, owing to the present strong exclusion from dm direct detection. in this article we design a mechanism to evade this constraint. the idea is simple. dm has a companion, and they are both charged under the dm protecting symmetry g; they admit the triline... | wimp dark matter hidden behind its companion |
the present work derived the robust constraints on annihilating weakly interacting massive particle (wimp) parameters utilizing new radio observations of m31 as well as new studies of its dark matter distribution and other properties. the characteristics of emission due to dark matter (dm) annihilation were computed in... | updated constraints on wimp dark matter annihilation by radio observations of m31 |
gamma-ray searches for new physics such as dark matter are often driven by investigating the composition of the extragalactic gamma-ray background (egb). classic approaches to egb decomposition manifest in resolving individual point sources and dissecting the intensity spectrum of the remaining unresolved component. fu... | constraining galactic dark matter with gamma-ray pixel counts statistics |
simplified models of the dark matter (co)annihilation mechanism predict striking new collider signatures untested by current searches. these models, which were codified in the coannihilation codex, provide the basis for a dark matter (dm) discovery program at the large hadron collider (lhc) driven by the measured dm re... | hunting for dark matter coannihilation by mixing dijet resonances and missing transverse energy |
searching for γ rays from dwarf spheroidal galaxies (dsphs) is a promising approach to detect dark matter (dm) due to the high dm densities and low baryon components in dsphs. the fermi-lat observations from dsphs have set stringent constraints on the velocity independent annihilation cross section. however, the constr... | constraint on the velocity dependent dark matter annihilation cross section from gamma-ray and kinematic observations of ultrafaint dwarf galaxies |
in this review statistical issues appearing in astrophysical searches for particle dark matter, i.e. indirect detection (dark matter annihilating into standard model particles) or direct detection (dark matter particles scattering in deep underground detectors) are discussed. one particular aspect of these searches is ... | statistical issues in astrophysical searches for particle dark matter |
in the minimal supersymmetric standard model (mssm) the bino-wino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (dm) relic density. however, such a scenario usually predicts a very small dm-nucleon scattering cross section that is below the neutrino floor, and can not be te... | probing bino-wino coannihilation dark matter under the neutrino floor at the lhc |
we present the results of dark matter (dm) searches in a sample of 31 dwarf irregular (dirr) galaxies within the field of view of the hawc observatory. dirr galaxies are dm-dominated objects in which astrophysical gamma-ray emission is estimated to be negligible with respect to the secondary gamma-ray flux expected by ... | searching for tev dark matter in irregular dwarf galaxies with hawc observatory |
a procedure to derive the partition function of non-interacting particles with exotic or intermediate statistics is presented. the partition function is directly related to the associated creation and annihilation operators that obey some specific commutation or anti-commutation relations. the cases of gentile statisti... | from creation and annihilation operators to statistics |
the nature of dark matter remains one of the most important open questions in physics. although dark matter effects have only been observed gravitationally, the order-one ratio between conventional matter and dark matter hints to a non-gravitational link between them. in this contribution, we search for such a link usi... | searches for connections between dark matter and neutrinos with the icecube high-energy starting event sample |
we present the full o (αs) supersymmetric qcd corrections for stop-antistop annihilation into electroweak final states within the minimal supersymmetric standard model. we also incorporate coulomb corrections due to gluon exchange between the incoming stops. numerical results for the annihilation cross sections and the... | susy-qcd corrections to stop annihilation into electroweak final states including coulomb enhancement effects |
the luminescence yield of transition metal dichalcogenide monolayers frequently suffers from the formation of long-lived dark states, which include excitons with intervalley charge carriers, spin-forbidden transitions, and a large center-of-mass momentum located outside the light cone of dispersion relations. efficient... | dark-state impact on the exciton recombination of ws2 monolayers as revealed by multi-timescale pump-probe spectroscopy |
galaxy clusters are the largest virialized objects in the universe and, as such, have high dark matter (dm) concentrations. this abundance of dark matter makes them promising targets for indirect dm searches. here we report the details of a search, utilizing almost 12 yr of fermi/lat data, for gamma-ray signatures from... | annihilating dark matter search with 12 yr of fermi lat data in nearby galaxy clusters |
we introduce a new paradigm for dark matter (dm) interactions in which the interaction strength is asymptotically safe. in models of this type, the coupling strength is small at low energies but increases at higher energies, and asymptotically approaches a finite constant value. the resulting phenomenology of this "asy... | asymptotically safe dark matter |
dark matter that gets captured in the sun may form positronium-like bound states if it self-interacts via light dark photons. in this case, dark matter can either annihilate to dark photons or recombine in bound states which subsequently also decay to dark photons. the fraction of the dark photons that leave the sun wi... | the spectrum of darkonium in the sun |
vector boson dark matter (dm) appears in su(2)n extension (n stands for neutral) of standard model (sm) where an additional global u(1)p symmetry is assumed and results in a generalized lepton number defined as: l=p+t3n. breaking of u(1)p leads to the breaking of l to (-1)l, thus stabilizing dm through modified r=(-1)3... | non-abelian vector boson dark matter, its unified route and signatures at the lhc |
the stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (dm) relic density in the minimal supersymmetric standard model (mssm). in such a coannihilation mechanism the stau mass usually has an upper bound since its annihilation rate becomes small with the increase ... | vacuum stability in stau-neutralino coannihilation in mssm |
we explore relativistic freeze-in production of scalar dark matter in gauged b − l model, where we focus on the production of dark matter from the decay and annihilation of standard model (sm) and b − l higgs bosons. we consider the bose-einstein (be) and fermi-dirac (fd) statistics, along with the thermal mass correct... | relativistic freeze-in with scalar dark matter in a gauged b − l model and electroweak symmetry breaking |
the padme experiment at the laboratori nazionali di frascati of the infn searches for a hypothetical dark photon a‧, produced in the annihilation between a positron of a beam with an electron of a target. the target is an active component of the experiment; it consists of a thin and large size diamond detector with a p... | operation and performance of the active target of padme |
we discuss the relic abundance of asymmetric dark matter particles in modified cosmological scenarios where the hubble rate is changed with respect to the standard cosmological scenario. the modified hubble rate leaves its imprint on the relic abundance of asymmetric dark matter particles if the asymmetric dark matter ... | relic density of asymmetric dark matter in modified cosmological scenarios |
new and complimentary constraints are placed on the spin-independent interactions of dark matter with baryonic matter. similar to the earth and other planets, the moon does not have any major internal heat source. we derive constraints by comparing the rate of energy deposit by dark matter annihilations in the moon to ... | constraints on dark matter from the moon |
an excess of gamma rays has been identified at the centre of the milky way, and annihilation of dark matter has been posited as a potential source. this hypothesis faces significant challenges: difficulty characterizing astrophysical backgrounds, the need for a non-trivial adiabatic contraction of the inner part of the... | dark matter substructure cannot explain properties of the fermi galactic centre excess |
we point out a selection rule for enhancement (suppression) of odd (even) partial waves of dark matter coannihilation or annihilation using the sommerfeld effect. using this, the usually velocity-suppressed p -wave annihilation can dominate the annihilation signals in the present universe. the selection mechanism is a ... | selection rule for enhanced dark matter annihilation |
the gamma-ray annihilation and decay products of very heavy dark matter particles can undergo attenuation through pair production, leading to the development of electromagnetic cascades. this has a significant impact not only on the spectral shape of the gamma-ray signal, but also on the angular distribution of the obs... | novel gamma-ray signatures of pev-scale dark matter |
as an interpretation of the 750 gev diphoton excesses recently reported by both atlas and cms collaborations, we consider a simple extension of the standard model with a dirac fermion dark matter where a singlet complex scalar field mediates between dark matter and sm particles via effective couplings to sm gauge boson... | diphoton resonance confronts dark matter |
we consider scenarios in which the annihilation of self-conjugate spin-1 dark matter to a standard model fermion-antifermion final state is chirality suppressed, but where this suppression can be lifted by the emission of an additional photon via internal bremsstrahlung. we find that this scenario can only arise if the... | vector dark matter annihilation with internal bremsstrahlung |
it is assumed that dark matter can annihilate or decay into standard model particles which then can produce a neutrino flux detectable at icecube. such a signal can be emitted from the galactic center thanks to the high density of dark matter abundance being gravitationally captured. this analysis aims at searching for... | indirect dark matter search in the galactic centre with icecube |
galaxy clusters are dominated by dark matter, and may have a larger proportion of surviving substructure than, e.g, field galaxies. due to the presence of galaxy clusters in relative proximity and their high dark matter content, they are promising targets for the indirect detection of dark matter via gamma-rays. indeed... | improved constraints on dark matter annihilation to a line using fermi-lat observations of galaxy clusters |
the non-thermal dark matter (dm) production via the so-called freeze-in mechanism provides a simple alternative to the standard thermal wimp scenario. in this work, we consider a popular u(1) b- lextension of the standard model (sm) in the context of inverse seesaw mechanism which has at least one (fermionic) fimp dm c... | fimp dark matter candidate(s) in a b - l model with inverse seesaw mechanism |
in the dynamical scotogenic model, the global b − l symmetry is supposed to be broken spontaneously resulting in a massless goldstone boson called majoron, and massive right handed neutrinos which participate in the generation of light neutrino massses at one-loop. one of them being the lightest stable particle can be ... | fermionic dark matter in dynamical scotogenic model |
if dark matter was produced in the early universe by the decoupling of its annihilations into known particles, there is a sharp experimental target for the size of its coupling. we show that if dark matter was produced by inelastic scattering against a lighter particle from the thermal bath, then its coupling can be ex... | thermal relic targets with exponentially small couplings |
this article is an exploration of gamma ray signals of annihilating higgs-portal singlet scalar and vector dark matter. gamma ray signals are considered in the context of contributions from annihilations of singlets in the galactic halo to the isotropic gamma ray background (igrb), in the context of the galactic center... | gamma ray signals of the annihilation of higgs-portal singlet dark matter |
we propose a new mechanism for rendering dark matter self-interacting in the presence of a massive spin-2 mediator. the derived yukawa-type potential for dark matter is independent of the spins of dark matter in the leading order of the momentum expansion, so are the resulting non-perturbative effects for the dark matt... | dark matter self-interactions from spin-2 mediators |
we present a study of the very degenerate higgsino dark matter (dm), whose mass splitting between the lightest neutral and charged components is o(1) mev, much smaller than radiative splitting of 355 mev. the scenario is realized in the minimal supersymmetric standard model by small gaugino mixings. in contrast to the ... | very degenerate higgsino dark matter |
a possible dark matter (dm) explanation about the long-standing issue of the galactic 511 kev line is explored in this paper. for dm cascade annihilations of concern, a dm pair π _d+ π _d- annihilates into unstable π _d0 π _d0, and π _d0 decays into e^+ e^- with new interactions suggested by the ^8be anomaly. consideri... | explanation of the 511 kev line: cascade annihilating dark matter with the ^8be anomaly |
due to the electroweak symmetry, high energy neutrinos and charged leptons are generically produced simultaneously in heavy dark matter decay or annihilation process. correlating these two channels in dark matter indirect detections may provide important information on the intrinsic production mechanism. in this paper,... | a strong test of the dark matter origin of a tev electron excess using icecube neutrinos |
previously, we have shown in li et al. [phys. rev. d 97, 122001 (2018), 10.1103/physrevd.97.122001] that very weak γ -ray excesses (∼2 σ ) appear in some milky way dwarf spheroidal galaxies (dsphs, including candidates) and the combination analysis of 12 nearby dsphs yields a local significance of >4 σ . in this wor... | search for gamma-ray emission from the 12 nearby dwarf spheroidal galaxies with 12 years of fermi-lat data |
we consider models for inflation with a stable inflaton. reheating is achieved through scattering processes such as ϕϕ→ h h, where h is the standard model higgs boson. we consider the reheating process in detail and show that for a relatively large coupling (needed for the late annihilations of the inflaton during free... | on the realization of wimpflation |
recent gamma-ray and radio studies have obtained some stringent constraints on annihilating dark matter properties. however, only a few studies have focused on using x-ray data to constrain annihilating dark matter. in this article, we perform the x-ray analysis of annihilating dark matter using the data of the omega c... | constraints on annihilating dark matter in the omega centauri cluster |
various alleged indirect dark matter search signals, such as the 511 kev line from galaxy center or the pamela/ams02 signal, are often challenged by the absence of corresponding signal from dwarf galaxies and/or by the absence of an impact on cmb through delayed recombination. we propose a novel scenario that can avoid... | pico-charged intermediate particles rescue dark matter interpretation of 511 kev signal |
we present an extension of the standard model, containing a fermion dark matter candidate and two real scalar singlets, where the observed dark matter abundance is produced via freeze-out before the electroweak phase transition. we show that, in this case, the dark matter annihilation channels determining its freeze-ou... | modifying dark matter indirect detection signals by thermal effects at freeze-out |
line-of-sight integrals of the squared density, commonly called the j-factor, are essential for inferring dark matter (dm) annihilation signals. the j-factors of dm-dominated dwarf spheroidal satellite galaxies (dsphs) have typically been derived using bayesian techniques, which for small data samples implies that a ch... | dwarf spheroidal j-factors without priors: a likelihood-based analysis for indirect dark matter searches |
we discuss the possibility of realizing a two-component dark matter (dm) scenario where the two dm candidates differ from each other by virtue of their production mechanism in the early universe. one of the dm candidates is thermally generated in a way similar to the weakly interacting massive particle (wimp) paradigm ... | two-component dark matter with cogenesis of the baryon asymmetry of the universe |
the cosmic antideuteron is a promising probe for the dark matter annihilation signature. in order to determine the dm signature, the background astrophysical antideuteron flux should be carefully studied. in this work we provide a new calculation of the secondary antideuteron flux, and pay special attention to the unce... | expectations of the cosmic antideuteron flux |
searches for "dark" subhaloes in gamma-ray point-like source catalogues are among promising strategies for indirect dark matter detection. such a search is nevertheless affected by uncertainties related, on the one hand, to the modelling of the dark matter subhalo distribution in milky-way-like galaxies, and, on the ot... | gamma-ray sensitivity to dark matter subhalo modelling at high latitudes |
the recent results of the edges collaboration indicate that during the era of reionization, the primordial gas was much colder than expected. the cooling of the gas could be explained by interactions between dark matter (dm) and particles in the primordial gas. constraints from cosmology and particle experiments indica... | constraints on mev dark matter using neutrino detectors and their implication for the 21-cm results |
we investigate the possibility of the z_3 scalar singlet model explaining the fermi galactic centre excess. we find a good fit to the measured spectral excess in the region where the dark matter mass is comparable to the higgs and the higgs portal coupling λhs ∼ 0.04. this preferred region is consistent with constraint... | the galactic center excess from z_3 scalar semi-annihilations |
in this paper, we studied the phenomenological consequences of recently proposed swampland conjecture on the inflationary models through constraints on reheating. if dark matter is assumed to be produced during reheating, the conjecture will provide further constraints on the dark matter parameter space through its cur... | reheating constraints on the inflaton and dark matter: swampland conjecture |
we consider majorana dark matter annihilation to fermion-anti-fermion pair and a photon in the effective field theory paradigm, by introducing dimension 6 and dimension 8 operators in the lagrangian. for a given value of the cut-off scale, the latter dominates the annihilation process for heavier dark matter masses. we... | constraints on dark matter annihilation to fermions and a photon |
we show that the pulsar mass depends on the environment, and that it decreases going towards the centre of the milky way. this is due to two combined effects, the capture and accumulation of self-interacting, non-annihilating dark matter by pulsars, and the increase of the dark matter density going towards the galactic... | on the change of old neutron star masses with galactocentric distance |
in this paper, we studied the phenomenological consequences of recently proposed swampland conjecture on the inflationary models though constraints on reheating. if dark matter is assumed to be produced during reheating, the conjecture will provide further constraints on the dark matter parameter space through its curr... | reheating constraints on inflaton, dark matter: swampland conjecture |
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