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the idea that primordial black holes (pbhs) can comprise most of the dark matter of the universe has recently reacquired a lot of momentum. observational constraints, however, rule out this possibility for most of the pbh masses, with a notable exception around 10-12 m⊙. these light pbhs may be originated when a sizabl... | testing primordial black holes as dark matter with lisa |
we study the decoupling process of neutrinos in the early universe in the presence of three-flavour oscillations. the evolution of the neutrino spectra is found by solving the corresponding momentum-dependent kinetic equations for the neutrino density matrix, including for the first time the proper collision integrals ... | relic neutrino decoupling with flavour oscillations revisited |
the phenomenon of cosmological gravitational particle production (cgpp) is expected to occur during the period of inflation and the transition into a hot big bang cosmology. particles may be produced even if they only couple directly to gravity, and so cgpp provides a natural explanation for the origin of dark matter. ... | cosmological gravitational particle production of massive spin-2 particles |
within ten nearby (d < 450 pc) gould belt molecular clouds we evaluate statistically the relative orientation between the magnetic field projected on the plane of sky, inferred from the polarized thermal emission of galactic dust observed by planck at 353 ghz, and the gas column density structures, quantified by the... | planck intermediate results. xxxv. probing the role of the magnetic field in the formation of structure in molecular clouds |
new data are reported from the operation of the pico-60 dark matter detector, a bubble chamber filled with 36.8 kg of cf3 i and located in the snolab underground laboratory. pico-60 is the largest bubble chamber to search for dark matter to date. with an analyzed exposure of 92.8 livedays, pico-60 exhibits the same exc... | dark matter search results from the pico-60 cf3 i bubble chamber |
the selection of high-redshift galaxies often involves spectral energy distribution (sed) fitting to photometric data, an expectation for contamination levels, and measurement of sample completeness-all vetted through comparison to spectroscopic redshift measurements of a sub-sample. the first jwst data are now being t... | spectral templates optimal for selecting galaxies at z > 8 with the jwst |
motivated by its potential use as a starting point for solving various cosmological constant problems, we study f‑theory compactified on the warped product where y8 is a manifold, and the s3 factor is the target space of an wess–zumino–witten (wzw) model at level n. reduction to m‑theory exploits the abelian duality of... | f‑theory and dark energy |
we present the first catalog of gamma-ray sources emitting above 56 and 100 tev with data from the high altitude water cherenkov observatory, a wide field-of-view observatory capable of detecting gamma rays up to a few hundred tev. nine sources are observed above 56 tev, all of which are likely galactic in origin. thre... | multiple galactic sources with emission above 56 tev detected by hawc |
we investigate the possibility of phantom crossing in the dark energy sector and solution for the hubble tension between early and late universe observations. we use robust combinations of different cosmological observations, namely the cmb, local measurement of hubble constant ($h_0$), bao and snia for this purpose. f... | dark energy with phantom crossing and the h0 tension |
we present measurements of the redshift-dependent clustering of a desi-like luminous red galaxy (lrg) sample selected from the legacy survey imaging data set, and use the halo occupation distribution (hod) framework to fit the clustering signal. the photometric lrg sample in this study contains 2.7 million objects over... | the clustering of desi-like luminous red galaxies using photometric redshifts |
weak galaxy lensing surveys have consistently reported a lower amplitude for the matter fluctuation spectrum, as measured by the s8 parameter, than expected in the λcdm cosmology favoured by planck. however, the expansion history follows the predictions of the planck λcdm cosmology to high accuracy, as do measurements ... | a non-linear solution to the s8 tension? |
a haloscope of the quax-a γ experiment, composed of an high-q resonant cavity immersed in a 8 t magnet and cooled to ∼4.5 k is operated to search for galactic axions with mass ma≃42.8 μ ev , not accessible to other running experiments. the design of the cavity with hollow dielectric cylinders concentrically inserted in... | search for galactic axions with a high-q dielectric cavity |
the early dark energy (ede) solution to the hubble tension comes at the cost of an increased clustering amplitude that has been argued to worsen the fit to galaxy clustering data. we explore whether freeing the total neutrino mass mν, which can suppress small-scale structure growth, improves ede's fit to galaxy cluster... | restoring cosmological concordance with early dark energy and massive neutrinos? |
recently, the hydrogen epoch of reionization array (hera) has produced the experiment's first upper limits on the power spectrum of 21 cm fluctuations at z ~ 8 and 10. here, we use several independent theoretical models to infer constraints on the intergalactic medium (igm) and galaxies during the epoch of reionization... | hera phase i limits on the cosmic 21 cm signal: constraints on astrophysics and cosmology during the epoch of reionization |
we present measurements of the spectral properties for a total of 526,265 quasars, out of which 63% have a continuum signal-to-noise ratio > 3 pixel-1, selected from the fourteenth data release of the sloan digital sky survey (sdss-dr14) quasar catalog. we performed a careful and homogeneous analysis of the sdss spe... | spectral properties of quasars from sloan digital sky survey data release 14: the catalog |
for the newly discovered w -boson mass anomaly, one of the simplest dark matter (dm) models that can account for the anomaly without violating other astrophysical and experimental constraints is the inert two higgs doublet model, in which the dm mass (ms) is found to be within ∼54 - 74 gev . in this model, the annihila... | explaining the gev antiproton excess, gev γ -ray excess, and w -boson mass anomaly in an inert two higgs doublet model |
we show that a scalar excited state with large occupation numbers during inflation leads to an enhancement of tensor modes and a characteristic pattern of order-one oscillations in the associated stochastic gravitational wave background (sgwb) sourced during inflation. an effective excited state, i.e. a departure from ... | primordial gravitational waves from excited states |
the energy spectrum of high-energy neutrinos reported by the icecube collaboration shows a dip between 400 tev and 1 pev. one intriguing explanation is that high-energy neutrinos scatter with the cosmic neutrino background through an ∼mev mediator. taking the density matrix approach, we develop a formalism to study the... | coherent propagation of pev neutrinos and the dip in the neutrino spectrum at icecube |
we present a new solution to the electroweak hierarchy problem. we introduce n copies of the standard model with varying values of the higgs mass parameter. this generically yields a sector whose weak scale is parametrically removed from the cutoff by a factor of 1 /√{n }. ensuring that reheating deposits a majority of... | solving the hierarchy problem at reheating with a large number of degrees of freedom |
primordial black holes (pbhs) represent a natural candidate for one of the components of the dark matter (dm) in the universe. in this review, we shall discuss the basics of their formation, abundance and signatures. some of their characteristic signals are examined, such as the emission of particles due to hawking eva... | a brief review on primordial black holes as dark matter |
the core cosmology library (ccl) provides routines to compute basic cosmological observables to a high degree of accuracy, which have been verified with an extensive suite of validation tests. predictions are provided for many cosmological quantities, including distances, angular power spectra, correlation functions, h... | core cosmology library: precision cosmological predictions for lsst |
theories of dark energy and modified gravity can be strongly constrained by astrophysical or cosmological observations, as illustrated by the recent observation of the gravitational wave event gw170817 and of its electromagnetic counterpart grb 170817a, which showed that the speed of gravitational waves, cg , is the sa... | scalar-tensor theories and modified gravity in the wake of gw170817 |
primordial black holes (pbh) could be the cold dark matter of the universe. they could have arisen from large (order one) curvature fluctuations produced during inflation that reentered the horizon in the radiation era. at reentry, these fluctuations source gravitational waves (gw) via second order anisotropic stresses... | gravitational wave signatures of inflationary models from primordial black hole dark matter |
the stochastic gravitational wave background (sgwb) is expected to be a key observable for gravitational wave (gw) interferometry. its detection will open a new window to early universe cosmology and to the astrophysics of compact objects. using a boltzmann approach, we study the angular anisotropies of the gw energy d... | anisotropies and non-gaussianity of the cosmological gravitational wave background |
we present simulations from the new “figuring out gas & galaxies in enzo” (foggie) project. in contrast to most extant simulations of galaxy formation, which concentrate computational resources on galactic disks and spheroids with fluid and particle elements of fixed mass, the foggie simulations focus on extreme sp... | figuring out gas & galaxies in enzo (foggie). i. resolving simulated circumgalactic absorption at 2 ≤ z ≤ 2.5 |
we present the most comprehensive global fits to date of three supersymmetric models motivated by grand unification: the constrained minimal supersymmetric standard model (cmssm), and its non-universal higgs mass generalisations nuhm1 and nuhm2. we include likelihoods from a number of direct and indirect dark matter se... | global fits of gut-scale susy models with gambit |
the initial data from the event horizon telescope (eht) on m 87* , the supermassive black hole at the center of the m87 galaxy, provide direct observational information on its mass, spin, and accretion disk properties. a combination of the eht data and other constraints provides evidence that m 87* has a mass ∼6.5 ×109... | ultralight boson dark matter and event horizon telescope observations of m 87* |
energy conditions can play an important role in defining the cosmological evolution. specifically acceleration/deceleration of cosmic fluid, as well as the emergence of big rip singularities, can be related to the constraints imposed by the energy conditions. here we discuss this issue for f (r) gravity considering als... | the role of energy conditions in f(r) cosmology |
axion-like early dark energy (ede) as an extension to $\lambda$cdm has been proposed as a possible solution to the 'hubble tension'. we revisit this model using a new cosmic microwave background (cmb) temperature and polarization likelihood constructed from the {\it planck} npipe data release. in a bayesian analysis, w... | improved planck constraints on axion-like early dark energy as a resolution of the hubble tension |
i present a review of how late observations of supernovae, of the nebular phase, and much later of supernova remnants (snrs), and their analysis in 2023 made progress towards breakthroughs in supporting the jittering jets explosion mechanism (jjem) for core-collapse supernovae (ccsne) and in introducing the group of lo... | supernovae in 2023 (review): breakthroughs by late observations |
we revisit the one-loop corrections on cmb scale perturbations induced from small scale modes in single field models which undergo a phase of ultra slow-roll inflation. there were concerns that large loop corrections are against the notion of the decoupling of scales and they are cancelled out once the boundary terms a... | revisiting loop corrections in single field usr inflation |
single field models of inflation capable of producing primordial black holes usually require a significant departure from the standard, perturbative slow-roll regime. in fact, in many of these scenarios, the size of the slow-roll parameter |η | becomes larger than one during a short phase of inflationary evolution. in ... | large |η | approach to single field inflation |
hot spots, or plasmoids, which form due to magnetic reconnection in current sheets, are conjectured to power frequent x-ray and near-infrared flares from sgr a*, the black hole in the center of our galaxy. it is unclear how, where, and when current sheets form in black hole accretion disks. we perform axisymmetric gene... | magnetic reconnection and hot spot formation in black hole accretion disks |
strongly-coupled theories at the tev can naturally drive a long period of supercooling in the early universe. trapped into the deconfined phase, the universe could inflate and cool down till the temperature reaches the qcd strong scale. we show how at these low temperatures qcd effects are important and could trigger t... | the supercooled universe |
many attempts to solve the hubble tension with extended cosmological models combine an enhanced relic radiation density, acting at the level of background cosmology, with new physical ingredients affecting the evolution of cosmological perturbations. several authors have pointed out the ability of combined baryon acous... | the bao+bbn take on the hubble tension |
we study the existence and stability of classical de sitter solutions of type ii supergravities with parallel dp-branes and orientifold op-planes. together with the dilaton and volume scalar fields, we consider a third one that distinguishes between parallel and transverse directions to the dp/op. we derive the complet... | new constraints on classical de sitter: flirting with the swampland |
we first show that the effective nonrelativistic theory of gravitationally interacting, massive integer-spin fields (spin-0, 1, and 2 in particular) is described by a 2 s +1 component schrödinger-poisson action, where s is the spin of the field. we then construct s +1 distinct, gravitationally supported solitons in thi... | polarized solitons in higher-spin wave dark matter |
primordial black hole (pbh) fluctuations can induce a stochastic gravitational wave background at second order, and since this procedure is sensitive to the underlying gravitational theory it can be used as a novel tool to test general relativity and extract constraints on possible modified gravity deviations. we apply... | no constraints for f(t) gravity from gravitational waves induced from primordial black hole fluctuations |
models that produce axionlike particles (alps) after cosmological inflation due to spontaneous u (1 ) symmetry breaking also produce cosmic-string networks. those axionic strings lose energy through gravitational-wave emission during the whole cosmological history, generating a stochastic background of gravitational wa... | constraining postinflationary axions with pulsar timing arrays |
i present a fast python tool, spectres, for carrying out the resampling of spectral flux densities and their associated uncertainties onto different wavelength grids. the function works with any grid of wavelength values, including non-uniform sampling, and preserves the integrated flux. this may be of use for binning ... | spectres: a fast spectral resampling tool in python |
we show that the well-known problem of frame dependence and violation of local lorentz invariance in the usual formulation of f(t) gravity is a consequence of neglecting the role of spin connection. we re-formulate f(t) gravity starting from, instead of the ‘pure tetrad’ teleparallel gravity, the covariant teleparallel... | the covariant formulation of f(t) gravity |
we present a theoretical analysis of some unexplored aspects of relaxed bose-einstein condensate dark matter (becdm) haloes. this type of ultralight bosonic scalar field dark matter is a viable alternative to the standard cold dark matter (cdm) paradigm, as it makes the same large-scale predictions as cdm and potential... | galaxy formation with becdm - i. turbulence and relaxation of idealized haloes |
the stochastic gravitational wave background (sgwb) recently detected by the pta collaborations could be the gravitational waves (gws) induced by curvature perturbations. however, primordial black holes (pbhs) might be overproduced if the sgwb is explained by the gws induced by the curvature perturbations that follow t... | axion curvaton model for the gravitational waves observed by pulsar timing arrays |
the total mass of a galaxy cluster is one of its most fundamental properties. together with the redshift, the mass links observation and theory, allowing us to use the cluster population to test models of structure formation and to constrain cosmological parameters. building on the rich heritage from x-ray surveys, new... | the galaxy cluster mass scale and its impact on cosmological constraints from the cluster population |
we discuss the nonlinear corrections entering in the calculation of the primordial black hole abundance from the nonlinear radiation transfer function and the determination of the true physical horizon crossing. we show that the current standard techniques to calculate the abundance of primordial black holes suffer fro... | how well do we know the primordial black hole abundance: the crucial role of nonlinearities when approaching the horizon |
on a time scale of years to decades, gravitational wave (gw) astronomy will become a reality. low frequency (nanohz) gws are detectable through long-term timing observations of the most stable pulsars. radio observatories worldwide are currently carrying out observing programmes to detect gws, with data sets being shar... | gravitational wave astronomy with the ska |
the broadening of atomic emission lines by high-velocity motion of gas near accreting supermassive black holes is an observational hallmark of quasars1. observations of broad emission lines could potentially constrain the mechanism for transporting gas inwards through accretion disks or outwards through winds2. the siz... | spatially resolved rotation of the broad-line region of a quasar at sub-parsec scale |
we investigate the prospects of detecting gravitational waves from coalescing massive black hole binaries in the universe with the tianqin observatory, a space-based gravitational wave interferometer proposed to be launched in the 2030s. to frame the scientific scope of the mission, in this paper, we carry out a prelim... | science with the tianqin observatory: preliminary results on massive black hole binaries |
code investigating galaxy emission (cigale) is a powerful multiwavelength spectral energy distribution (sed) fitting code for extragalactic studies. however, the current version of cigale is not able to fit x-ray data, which often provide unique insights into active galactic nucleus (agn) intrinsic power. we develop a ... | x-cigale: fitting agn/galaxy seds from x-ray to infrared |
we present a framework for forecasting cosmological constraints from future neutral hydrogen intensity mapping experiments at low to intermediate redshifts. in the process, we establish a simple way of comparing such surveys with optical galaxy redshift surveys. we explore a wide range of experimental configurations an... | late-time cosmology with 21 cm intensity mapping experiments |
we study a model of inflation in which a scalar field χ is non-minimally coupled to starobinsky's r2 gravity. after transforming it to the einstein frame, a new scalar field, the scalaron phi, will appear and couple to χ with a nontrivial field metric, while χ acquires a positive mass via the non-minimal coupling. init... | scalaron from r2-gravity as a heavy field |
we consider the cosmology derived from f( t, b) gravity where t is the torsion scalar and b=2/epartial _{μ }(e t^{μ }) a boundary term. in particular we discuss how it is possible to recover, under the same standard, the teleparallel f( t) gravity, the curvature f( r) gravity, and the teleparallel-curvature f( r, t) gr... | noether symmetry approach in f( t, b) teleparallel cosmology |
we present the data and initial results from the first pilot survey of the evolutionary map of the universe (emu), observed at 944 mhz with the australian square kilometre array pathfinder (askap) telescope. the survey covers $270 deg^2$ of an area covered by the dark energy survey, reaching a depth of 25-30 $μjy beam^... | the evolutionary map of the universe pilot survey |
discovery of pulsars is one of the main goals for large radio telescopes. the five-hundred-meter aperture spherical radio telescope (fast), that incorporates an l-band 19-beam receiver with a system temperature of about 20 k, is the most sensitive radio telescope utilized for discovering pulsars. we designed the snapsh... | the fast galactic plane pulsar snapshot survey: i. project design and pulsar discoveries |
we define compactness of a gravitational lens as the scaled closest distance of approach (i.e., $r_0/m$) of the null geodesic giving rise to an image. we model forty supermassive dark objects as schwarzschild lenses and compute compactness of lenses (determined by the formation of the first order relativistic image). w... | compactness of supermassive dark objects at galactic centers |
we compute the spherically averaged power spectrum from four seasons of data obtained for the epoch of reionization (eor) project observed with the murchison widefield array (mwa). we measure the eor power spectrum over k = 0.07-3.0 h mpc-1 at redshifts z = 6.5-8.7. the largest aggregation of 110 h on eor0 high band (3... | deep multiredshift limits on epoch of reionization 21 cm power spectra from four seasons of murchison widefield array observations |
anti-de sitter (ads) vacua, being theoretically important, might have an unexpected impact on the observable universe. we find that in early dark energy (ede) scenarios the existence of ads vacua around recombination can effectively lift the cmb-inferred h0 value. as an example, we study a phenomenological ede model wi... | is the hubble tension a hint of ads phase around recombination? |
we search for isotropic stochastic gravitational-wave background (sgwb) in the international pulsar timing array second data release. by modeling the sgwb as a power-law, we find very strong bayesian evidence for a common-spectrum process, and further this process has scalar transverse (st) correlations allowed in gene... | searching for isotropic stochastic gravitational-wave background in the international pulsar timing array second data release |
we construct an analytically solvable simplified model that captures the essential features for primordial black hole (pbh) production in most models of single-field inflation. the construction makes use of the wands duality between the constant-roll (or slow-roll) and the preceding ultra-slow-roll phases and can be re... | anatomy of single-field inflationary models for primordial black holes |
we perform an ensemble of n-body simulations with 20483 particles for 101 flat wcdm cosmological models sampled based on a maximin distance sliced latin hypercube design. by using the halo catalogs extracted at multiple redshifts in the range of z = [0,1.48], we develop dark emulator, which enables fast and accurate co... | dark quest. i. fast and accurate emulation of halo clustering statistics and its application to galaxy clustering |
we use a new and statistically powerful planck likelihood to show that the planck temperature and polarization spectra are consistent with a spatially flat universe, in contrast to recent claims in the literature. when combined with other astrophysical data, particularly geometrical measurements of baryon acoustic osci... | the evidence for a spatially flat universe |
we interpret the recent nanograv results in terms of a stochastic gravitational wave background from metastable cosmic strings. the observed amplitude of a stochastic signal can be translated into a range for the cosmic string tension and the mass of magnetic monopoles arising in theories of grand unification. in a siz... | from nanograv to ligo with metastable cosmic strings |
fast radio bursts (frbs) are millisecond-duration radio transients of unknown physical origin observed at extragalactic distances1-3. it has long been speculated that magnetars are the engine powering repeating bursts from frb sources4-13, but no convincing evidence has been collected so far14. recently, the galactic m... | no pulsed radio emission during a bursting phase of a galactic magnetar |
we present the grackle chemistry and cooling library for astrophysical simulations and models. grackle provides a treatment of non-equilibrium primordial chemistry and cooling for h, d and he species, including h2 formation on dust grains; tabulated primordial and metal cooling; multiple ultraviolet background models; ... | grackle: a chemistry and cooling library for astrophysics |
large, nonstandard neutrino self-interactions have been shown to resolve the ∼4 σ tension in hubble constant measurements and a milder tension in the amplitude of matter fluctuations. we demonstrate that interactions of the necessary size imply the existence of a force carrier with a large neutrino coupling (>10-4 )... | constraining the self-interacting neutrino interpretation of the hubble tension |
in the last fifteen years radio detection made it back to the list of promising techniques for extensive air showers, firstly, due to the installation and successful operation of digital radio experiments and, secondly, due to the quantitative understanding of the radio emission from atmospheric particle cascades. the ... | radio detection of cosmic-ray air showers and high-energy neutrinos |
recent astrophysical transient swift j1913.1+1946 is possibly associated with the gamma-ray burst grb 221009a at the redshift $z ≈ 0.151$. the transient was accompanied by very high-energy gamma rays up to 18 tev observed by lhaaso and a photon-like air shower of 251 tev detected by carpet-2. these energetic gamma rays... | parameters of axion-like particles required to explain high-energy photons from grb 221009a |
massive spinning particles acquire helicity-dependent chemical potentials during the inflation from axion-type couplings. such spinning fields can mediate sizable inflaton correlators which we call the helical inflation correlators. helical inflaton correlators are approximately scale invariant, ds boost breaking, pari... | helical inflation correlators: partial mellin-barnes and bootstrap equations |
we present lenstronomy, a multi-purpose open-source gravitational lens modelling pythonpackage. lenstronomy is able to reconstruct the lens mass and surface brightness distributions of strong lensing systems using forward modelling. lenstronomy supports a wide range of analytic lens and light models in arbitrary combin... | lenstronomy: multi-purpose gravitational lens modelling software package |
now that conventional weakly interacting massive particle (wimp) dark matter searches are approaching the neutrino floor, there has been a resurgence of interest in detectors with sensitivity to nuclear recoil directions. a large-scale directional detector is attractive in that it would have sensitivity below the neutr... | cygnus: feasibility of a nuclear recoil observatory with directional sensitivity to dark matter and neutrinos |
many cosmological phenomena lead to the production of primordial black holes in the early universe. these phenomena often create a population of black holes with extended mass and spin distributions. as these black holes evaporate via hawking radiation, they can modify various cosmological observables, lead to the prod... | evaporation of primordial black holes in the early universe: mass and spin distributions |
masses of clusters of galaxies from weak gravitational lensing analyses of ever larger samples are increasingly used as the reference to which baryonic scaling relations are compared. in this paper we revisit the analysis of a sample of 50 clusters studied as part of the canadian cluster comparison project. we examine ... | the canadian cluster comparison project: detailed study of systematics and updated weak lensing masses |
in this paper, we explore the nonsingular cosmology within the framework of the effective field theory (eft) of cosmological perturbations. due to the recently proved no-go theorem, any nonsingular cosmological models based on the cubic galileon suffer from pathologies. we show how the eft could help us clarify the ori... | the effective field theory of nonsingular cosmology |
we propose a framework in which the qcd axion has an exponentially large coupling to photons, relying on the "clockwork" mechanism. we discuss the impact of present and future axion experiments on the parameter space of the model. in addition to the axion, the model predicts a large number of pseudoscalars which can be... | the photo-philic qcd axion |
we report on the first results from a new microwave cavity search for dark matter axions with masses above 20 μ ev . we exclude axion models with two-photon coupling ga γ γ≳2 ×10-14 gev-1 over the range 23.55 <ma<24.0 μ ev . these results represent two important achievements. first, we have reached cosmologically... | first results from a microwave cavity axion search at 24 μ ev |
an accurate theoretical template for the galaxy power spectrum is key for the success of ongoing and future spectroscopic surveys. we examine to what extent the effective field theory (eft) of large-scale structure is able to provide such a template and correctly estimate cosmological parameters. to that end, we initia... | blinded challenge for precision cosmology with large-scale structure: results from effective field theory for the redshift-space galaxy power spectrum |
in this work, we systematically calculate the mass spectra of the s -wave fully-heavy tetraquark states, b b b ¯b ¯, c c c ¯c ¯, and b b c ¯c ¯, in two nonrelativistic quark models. a tetraquark state may be an admixture of a 6c-6¯ c state and a 3¯ c-3c one, where 6c-6¯ c (3¯ c-3c ) denotes the color configuration with... | spectrum of the fully-heavy tetraquark state q q q¯ 'q¯ ' |
after the discovery of the higgs boson, understanding the nature of electroweak symmetry breaking and the associated electroweak phase transition has become the most pressing question in particle physics. answering this question is a priority for experimental studies. data from the lhc and future lepton collider-based ... | probing the electroweak phase transition with higgs factories and gravitational waves |
this report summarizes the present status of neutrino non-standard interactions (nsi). after a brief overview, several aspects of nsis are discussed, including connection to neutrino mass models, model-building and phenomenology of large nsi with both light and heavy mediators, nsi phenomenology in both short- and long... | neutrino non-standard interactions: a status report |
this note presents an initial survey design for the nancy grace roman high-latitude time domain survey. this is not meant to be a final or exhaustive list of all the survey strategy choices, but instead presents a viable path towards achieving the desired precision and accuracy of dark energy measurements using type ia... | a reference survey for supernova cosmology with the nancy grace roman space telescope |
observations reveal a "bulk flow" in the local universe which is faster and extends to much larger scales than are expected around a typical observer in the standard λcdm cosmology. this is expected to result in a scale-dependent dipolar modulation of the acceleration of the expansion rate inferred from observations of... | evidence for anisotropy of cosmic acceleration |
modifications of general relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the evolution of cosmological perturbations in the scalar and in the tensor sectors. in particular, the modification in the tensor sector gives rise to a notion of gra... | testing modified gravity at cosmological distances with lisa standard sirens |
we use the ages of old astrophysical objects (oao) in the redshift range 0 ≲ z ≲ 8 as stringent tests of the late-time cosmic expansion history. since the age of the universe at any redshift is inversely proportional to h0, requiring that the universe be older than the oldest objects it contains at any redshift, provid... | implications for the hubble tension from the ages of the oldest astrophysical objects |
based on the assumption that quasars (qsos) and gamma-ray bursts (grbs) represent standardizable candles, we provide evidence that the hubble constant h0 adopts larger values in hemispheres aligned with the cosmic microwave background (cmb) dipole direction. if substantiated, this trend signals a departure from friedma... | larger h0 values in the cmb dipole direction |
primordial black holes can be produced by density fluctuations generated from delayed vacuum decays of first-order phase transition. the primordial black holes generated at the electroweak phase transition have masses of about 10-5 solar mass. such primordial black holes in the mass range can be tested by current and f... | primordial black holes as a probe of strongly first-order electroweak phase transition |
this study presents a catalog of 8107 molecular clouds that covers the entire galactic plane and includes 98% of the 12co emission observed within b+/- 5^\circ . the catalog was produced using a hierarchical cluster identification method applied to the result of a gaussian decomposition of the dame et al. data. the tot... | physical properties of molecular clouds for the entire milky way disk |
we introduce new modules in the open-source pycbc gravitational-wave astronomy toolkit that implement bayesian inference for compact-object binary mergers. we review the bayesian inference methods implemented and describe the structure of the modules. we demonstrate that the pycbc inference modules produce unbiased est... | pycbc inference: a python-based parameter estimation toolkit for compact binary coalescence signal |
we have performed the first three-dimensional simulations of strong first-order thermal phase transitions in the early universe. for deflagrations, we find that the rotational component of the fluid velocity increases as the transition strength is increased. for detonations, however, the rotational velocity component r... | vorticity, kinetic energy, and suppressed gravitational-wave production in strong first-order phase transitions |
the nature of dark matter, the invisible substance making up over $80\%$ of the matter in the universe, is one of the most fundamental mysteries of modern physics. ultralight bosons such as axions, axion-like particles or dark photons could make up most of the dark matter. couplings between such bosons and nuclear spin... | constraints on bosonic dark matter from ultralow-field nuclear magnetic resonance |
we examine in depth a recent proposal to utilize superfluid helium for direct detection of sub-mev mass dark matter. for sub-kev recoil energies, nuclear scattering events in liquid helium primarily deposit energy into long-lived phonon and roton quasiparticle excitations. if the energy thresholds of the detector can b... | light dark matter in superfluid helium: detection with multi-excitation production |
we consider the effects of nonminimal couplings to curvature of the form ξss2r for three types of scalars: the higgs boson, the inflaton, and a scalar dark matter candidate. we compute the abundance of dark matter produced by these nonminimal couplings to gravity and compare to similar results with minimal couplings. w... | gravitational portals with nonminimal couplings |
a variety of observations impose upper limits at the nano gauss level on magnetic fields that are coherent on inter-galactic scales while blazar observations indicate a lower bound ∼10‑16 g. such magnetic fields can play an important astrophysical role, for example at cosmic recombination and during structure formation... | progress on cosmological magnetic fields |
the nature of dark matter is a longstanding enigma of physics; it may consist of particles beyond the standard model that are still elusive to experiments. among indirect search techniques, which look for stable products from the annihilation or decay of dark matter particles, or from axions coupling to high-energy pho... | sensitivity projections for dark matter searches with the fermi large area telescope |
we use the largest sample of z∼ 6 galaxies to date from the first four hubble frontier fields clusters to set constraints on the shape of the z∼ 6 luminosity functions (lfs) to fainter than {m}{uv,{ab}}=-14 mag. we quantify, for the first time, the impact of magnification uncertainties on lf results and thus provide mo... | the z ∼ 6 luminosity function fainter than -15 mag from the hubble frontier fields: the impact of magnification uncertainties |
sdss j015957.64+003310.5 is an x-ray selected, z = 0.31 active galactic nucleus (agn) from the stripe 82x survey that transitioned from a type 1 quasar to a type 1.9 agn between 2000 and 2010. this is the most distant agn, and first quasar, yet observed to have undergone such a dramatic change. we re-observed the sourc... | the discovery of the first “changing look” quasar: new insights into the physics and phenomenology of active galactic nucleus |
radio synchrotron emission, its polarization and faraday rotation of the polarization angle are powerful tools to study the strength and structure of magnetic fields in galaxies. unpolarized synchrotron emission traces isotropic turbulent fields which are strongest in spiral arms and bars (20-30 \upmu g) and in central... | magnetic fields in spiral galaxies |
the wide field infrared survey telescope (wfirst) is the next nasa astrophysics flagship mission, to follow the james webb space telescope. the wfirst mission was chosen as the top-priority large space mission of the 2010 astronomy and astrophysics decadal survey in order to achieve three primary goals: to study dark e... | predictions of the wfirst microlensing survey. i. bound planet detection rates |
preface to the first edition; preface to the second edition; 1. cosmic rays; 2. cosmic ray data; 3. particle physics; 4. hadronic interactions and accelerator data; 5. cascade equations; 6. atmospheric muons and neutrinos; 7. neutrino masses and oscillations; 8. muons and neutrinos underground; 9. cosmic rays in the ga... | cosmic rays and particle physics |
the curvature perturbations produced during an early era of inflation are known to have quasi-gaussian distribution functions close to their maximum, where they are well constrained by measurements of the cosmic microwave background anisotropies and of the large-scale structures. in contrast, the tails of these distrib... | the exponential tail of inflationary fluctuations: consequences for primordial black holes |
the distribution of the non-luminous matter in galaxies of different luminosity and hubble type is much more than a proof of the existence of dark particles governing the structures of the universe. here, we will review the complex but well-ordered scenario of the properties of the dark halos also in relation with thos... | the distribution of dark matter in galaxies |
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