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this paper details the modeling pipeline and validates the baseline analysis choices of the des year 3 joint analysis of galaxy clustering and weak lensing (a so-called "3$\times$2pt" analysis). these analysis choices include the specific combination of cosmological probes, priors on cosmological and systematics parame... | dark energy survey year 3 results: multi-probe modeling strategy and validation |
the existence of a light or massive scalar field with a coupling to matter weaker than gravitational strength is a possible source of violation of the weak equivalence principle. we use the first results on the eötvös parameter by the microscope experiment to set new constraints on such scalar fields. for a massive sca... | microscope mission: first constraints on the violation of the weak equivalence principle by a light scalar dilaton |
a dark-energy, which behaves as the cosmological constant until a sudden phantom transition at very low redshift (z < 0.1), seems to solve the >4σ disagreement between the local and high-redshift determinations of the hubble constant, while maintaining the phenomenological success of the λ cold dark matter model ... | on the use of the local prior on the absolute magnitude of type ia supernovae in cosmological inference |
computing the properties of the bubble wall of a cosmological first order phase transition at electroweak scale is of paramount importance for the correct prediction of the baryon asymmetry of the universe and the spectrum of gravitational waves. by means of the semiclassical formalism we calculate the velocity and thi... | electroweak bubble wall expansion: gravitational waves and baryogenesis in standard model-like thermal plasma |
the possible gamma-ray excess in the inner galaxy and the galactic center (gc) suggested by fermi-lat observations has triggered a large number of studies. it has been interpreted as a variety of different phenomena such as a signal from wimp dark matter annihilation, gamma-ray emission from a population of millisecond... | background model systematics for the fermi gev excess |
we study the comoving curvature perturbation r in the single-field inflation models whose potential can be approximated by a piecewise quadratic potential v (φ ) by using the δ n formalism. we find a general formula for r (δ φ ,δ π ) , consisting of a sum of logarithmic functions of the field perturbation δ φ and the v... | logarithmic duality of the curvature perturbation |
we derive the strongest constraint on the fraction of dark matter that can be composed of low mass primordial black holes by using the observation of the galactic center 511 kev γ -ray line. primordial black holes of masses ≲1015 kg will evaporate to produce e± pairs. the positrons will lose energy in the galactic cent... | primordial black holes as a dark matter candidate are severely constrained by the galactic center 511 kev γ -ray line |
we provide some comments about the constraints on the inflationary models inferred from the two swampland criteria which have been recently proposed. in particular we argue that, in the absence of any knowledge about the origin of the adiabatic curvature perturbations, within the slow-roll single field models of inflat... | a note on inflation and the swampland |
we present the possibility that the seesaw mechanism with thermal leptogenesis can be tested using the stochastic gravitational background. achieving neutrino masses consistent with atmospheric and solar neutrino data, while avoiding nonperturbative couplings, requires right handed neutrinos lighter than the typical sc... | testing the seesaw mechanism and leptogenesis with gravitational waves |
we point out two ways to search for low-mass axion dark matter using cosmic microwave background (cmb) polarization measurements. these appear, in particular, to be some of the most promising ways to directly detect fuzzy dark matter. axion dark matter causes rotation of the polarization of light passing through it. th... | axion dark matter detection with cmb polarization |
the standard model higgs potential becomes unstable at large field values. after clarifying the issue of gauge dependence of the effective potential, we study the cosmological evolution of the higgs field in presence of this instability throughout inflation, reheating and the present epoch. we conclude that anti-de sit... | the cosmological higgstory of the vacuum instability |
the abundance of primordial black holes (pbhs) in the mass range 0.1-103 msolar can potentially be tested by gravitational wave observations due to the large merger rate of pbh binaries formed in the early universe. to put the estimates of the latter on a firmer footing, we first derive analytical pbh merger rate for g... | formation and evolution of primordial black hole binaries in the early universe |
a key insight of the bootstrap approach to cosmological correlations is the fact that all correlators of slow-roll inflation can be reduced to a unique building block — the four-point function of conformally coupled scalars, arising from the exchange of a massive scalar. correlators corresponding to the exchange of par... | the cosmological bootstrap: weight-shifting operators and scalar seeds |
in this work we revisit the construction of theories for a massive vector field with derivative self-interactions such that only the 3 desired polarizations corresponding to a proca field propagate. we start from the decoupling limit by constructing healthy interactions containing second derivatives of the stueckelberg... | derivative self-interactions for a massive vector field |
dark matter (dm) could couple to particles in the standard model (sm) through a light vector mediator. in the limit of small coupling, this portal could be responsible for producing the observed dm abundance through a mechanism known as freeze-in. furthermore, the requisite dm-sm couplings provide a concrete benchmark ... | making dark matter out of light: freeze-in from plasma effects |
we present the first cosmological parameter constraints using measurements of type ia supernovae (sne ia) from the dark energy survey supernova program (des-sn). the analysis uses a subsample of 207 spectroscopically confirmed sne ia from the first three years of des-sn, combined with a low-redshift sample of 122 sne f... | first cosmology results using type ia supernovae from the dark energy survey: constraints on cosmological parameters |
astroparticle physics is undergoing a profound transformation, due to a series of extraordinary new results, such as the discovery of high-energy cosmic neutrinos with icecube, the direct detection of gravitational waves with ligo and virgo, and many others. this white paper is the result of a collaborative effort that... | eucapt white paper: opportunities and challenges for theoretical astroparticle physics in the next decade |
the low frequency array (lofar) is an ideal instrument to conduct deep extragalactic surveys. it has a large field of view and is sensitive to large-scale and compact emission. it is, however, very challenging to synthesize thermal noise limited maps at full resolution, mainly because of the complexity of the low-frequ... | the lofar two-meter sky survey: deep fields data release 1. i. direction-dependent calibration and imaging |
we combine new analysis of the stochastic gravitational wave background to be expected from cosmic strings with the latest pulsar timing array (pta) limits to give an upper bound on the energy scale of the possible cosmic string network, gμ < 1.5 ×10-11 at the 95% confidence level. we also show bounds from ligo and ... | new limits on cosmic strings from gravitational wave observation |
we study production of gravitational waves (gws) in strongly supercooled cosmological phase transitions in gauge theories. we extract from two-bubble lattice simulations the scaling of the gw source, and use it in many-bubble simulations in the thin-wall limit to estimate the resulting gw spectrum. we find that in pres... | gravitational waves from colliding vacuum bubbles in gauge theories |
we show that the excess in electron recoil events seen by the xenon1t experiment can be explained by a relatively low-mass luminous dark matter candidate. the dark matter scatters inelastically in the detector (or the surrounding rock) to produce a heavier dark state with a ∼2 - 3 kev mass splitting. this heavier state... | explaining the xenon1t excess with luminous dark matter |
cosmic shear is the distortion of images of distant galaxies due to weak gravitational lensing by the large-scale structure in the universe. such images are coherently deformed by the tidal field of matter inhomogeneities along the line of sight. by measuring galaxy shape correlations, we can study the properties and e... | cosmology with cosmic shear observations: a review |
we present measurements of cosmic shear two-point correlation functions (tpcfs) from hyper suprime-cam subaru strategic program (hsc) first-year data, and derive cosmological constraints based on a blind analysis. the hsc first-year shape catalog is divided into four tomographic redshift bins ranging from $z=0.3$ to 1.... | cosmological constraints from cosmic shear two-point correlation functions with hsc survey first-year data |
we compute and investigate four types of imprint of a stochastic background of primordial magnetic fields (pmfs) on the cosmic microwave background (cmb) anisotropies: the impact of pmfs on the cmb temperature and polarization spectra, which is related to their contribution to cosmological perturbations; the effect on ... | planck 2015 results. xix. constraints on primordial magnetic fields |
we search for signatures of gravitational lensing in the gravitational-wave signals from compact binary coalescences detected by advanced laser interferometer gravitational-wave observatory (ligo) and advanced virgo during o3a, the first half of their third observing run. we study: (1) the expected rate of lensing at c... | search for lensing signatures in the gravitational-wave observations from the first half of ligo-virgo's third observing run |
we consider a real scalar singlet field which provides a strong first-order electroweak phase transition via its coupling to the higgs boson, and gives a c p violating contribution on the top quark mass via a dimension-6 operator. we study the correlation between the baryon-to-entropy ratio produced by electroweak bary... | electroweak baryogenesis and gravitational waves from a real scalar singlet |
we show that a combined analysis of cosmic microwave background anisotropy power spectra obtained by the planck satellite and luminosity distance data simultaneously excludes a flat universe and a cosmological constant at 99% confidence level. these results hold separately when combining planck with three different dat... | investigating cosmic discordance |
in this paper, we investigated the effect of dark matter on the weak deflection angle by black holes at the galactic center. we consider three known dark matter density profiles such as the cold dark matter, scalar field dark matter, and the universal rotation curve from the burkert profile. to achieve this goal, we us... | dark matter effect on the weak deflection angle by black holes at the center of milky way and m87 galaxies |
in this paper, we study a possible early universe source for the recent observation of a stochastic gravitational wave background at the nanograv pulsar timing array. the source is a tachyonic instability in a dark gauge field induced by an axion-like particle (alp), a known source for gravitational waves. we find that... | challenges in interpreting the nanograv 15-year data set as early universe gravitational waves produced by alp induced instability |
recently, multiple pulsar timing array collaborations have presented compelling evidence for a stochastic signal at nanohertz frequencies, potentially originating from cosmic strings. cosmic strings are linear topological defects that can arise during phase transitions in the early universe or as fundamental strings in... | prospects for taiji to detect a gravitational-wave background from cosmic strings |
general relativity predicts that gravitational waves propagate at the speed of light. although ground-based gravitational-wave detectors have successfully constrained the velocity of gravitational waves in the high-frequency range, extending this constraint to the lower frequency range remains a challenge. in this work... | constraints on the velocity of gravitational waves from nanograv 15-year data set |
dark matter (dm) particles with mass in the sub-gev range are an attractive alternative to heavier weakly interacting massive particles, but direct detection of such light particles is challenging. if, however, dm-nucleus scattering leads to ionization of the recoiling atom, the resulting electron may be detected even ... | directly detecting sub-gev dark matter with electrons from nuclear scattering |
persisting tensions between high-redshift and low-redshift cosmological observations suggest the dark energy sector of the universe might be more complex than the positive cosmological constant of the λcdm model. motivated by string theory, wherein symmetry considerations make consistent ads backgrounds (i.e., maximall... | revisiting a negative cosmological constant from low-redshift data |
current cosmological data exhibit discordance between indirect and some direct inferences of the present-day expansion rate h0 . early dark energy (ede), which briefly increases the cosmic expansion rate prior to recombination, is a leading scenario for resolving this "hubble tension" while preserving a good fit to cos... | canonical hubble-tension-resolving early dark energy cosmologies are inconsistent with the lyman-α forest |
we compute the decay spectrum for dark matter (dm) with masses above the scale of electroweak symmetry breaking, all the way to the planck scale. for an arbitrary hard process involving a decay to the unbroken standard model, we determine the prompt distribution of stable states including photons, neutrinos, positrons,... | dark matter spectra from the electroweak to the planck scale |
we show that the minimal type-i seesaw mechanism can successfully account for the observed dark matter abundance in the form of a kev sterile neutrino. this population can be produced by the decay of the heavier neutral leptons, with masses above the electroweak mass scale, while they are in thermal equilibrium in the ... | freeze-in dark matter within the seesaw mechanism |
we discuss cosmic domain walls described by a tension redshifting with the expansion of the universe. these melting domain walls emit gravitational waves with the low-frequency spectral shape ωg w∝f2 corresponding to the spectral index γ =3 favored by the recent nanograv 15 yrs data. we discuss a concrete high-energy p... | nanograv spectral index γ =3 from melting domain walls |
releasing the 12.5-year pulsar timing array data, the north american nanohertz observatory for gravitational waves (nanograv) has recently reported the evidence for a stochastic common-spectrum which would herald the detection of a stochastic gravitational wave background (sgwb) for the first time. we investigate if th... | nanograv signal from the end of inflation and the ligo mass and heavier primordial black holes |
gravitational waves are expected to be radiated by supermassive black hole binaries formed during galaxy mergers. a stochastic superposition of gravitational waves from all such binary systems would modulate the arrival times of pulses from radio pulsars. using observations of millisecond pulsars obtained with the park... | gravitational waves from binary supermassive black holes missing in pulsar observations |
the hubble tension can be significantly eased if there is an early component of dark energy that becomes active around the time of matter-radiation equality. early dark energy models suffer from a coincidence problem—the physics of matter-radiation equality and early dark energy are completely disconnected, so some deg... | early dark energy from massive neutrinos as a natural resolution of the hubble tension |
the event horizon telescope (eht) collaboration recently published the first images of the supermassive black holes in the cores of the messier 87 and milky way galaxies. these observations have provided a new means to study supermassive black holes and probe physical processes occurring in the strong-field regime. we ... | fundamental physics opportunities with the next-generation event horizon telescope |
a group of massive galaxies at redshifts of $z\gtrsim 7$ have been recently detected by the james webb space telescope (jwst), which were unexpected to form at such early time within the standard big bang cosmology. in this work, we propose that this puzzle can be explained by the presence of some primordial black hole... | rapidly growing primordial black holes as seeds of the massive high-redshift jwst galaxies |
we present a bayesian population modeling method to analyze the abundance of galaxy clusters identified by the south pole telescope (spt) with a simultaneous mass calibration using weak gravitational lensing data from the dark energy survey (des) and the hubble space telescope (hst). we discuss and validate the modelin... | spt clusters with des and hst weak lensing. i. cluster lensing and bayesian population modeling of multi-wavelength cluster datasets |
global cosmic strings are predicted in many motivated extensions to the standard model of particle physics, with close connections to axion dark matter physics. recent studies suggest that, although subdominant relative to goldstone emission, gravitational wave (gw) signals from global strings can be detectable with cu... | gravitational waves from global cosmic strings and cosmic archaeology |
the time evolution of primordial fluctuations conceals a wealth of insights into the high-energy physics at play during the earliest moments of our universe, which is ultimately encoded in late-time spatial correlation functions. however, the conventional procedure to compute them is technically challenging, and a comp... | the cosmological flow: a systematic approach to primordial correlators |
recently, pulsar timing array experiments reported the observation of a stochastic gravitational wave background in the nanohertz range frequency band. we show that such a signal can be originated from a cosmological first-order phase transition (pt) within a well-motivated heavy (visible) qcd axion model. considering ... | heavy qcd axion model in light of pulsar timing arrays |
our work highlights the crucial role played by the equation of state (eos) parameter $w$ within the context of single field inflation with multiple sharp transitions (msts) to untangle the current state of the pbh overproduction issue. we examine the situation for a broad interval of eos parameter that remains most fav... | untangling pbh overproduction in $w$-sigws generated by pulsar timing arrays for mst-eft of single field inflation |
understanding the co-evolution of supermassive black holes (smbhs) and their host systems requires a comprehensive census of active galactic nuclei (agn) behavior across a wide range of redshift, luminosity, obscuration level and galaxy properties. we report significant progress with jwst towards this goal from the sys... | agn selection and demographics: a new age with jwst/miri |
the detection of the stochastic gravitational wave background by nanograv imposes constraints on the mass of compact cores of ultralight dark matter, also known as "solitons", surrounding supermassive black holes found at the centers of large galaxies. the strong dynamical friction between the rotating black holes and ... | bounds on ultralight dark matter from nanograv |
the hubble parameter $h_0$, is not a univocally-defined quantity: it relates redshifts to distances in the near universe, but is also a key parameter of the $\lambda$cdm standard cosmological model. as such, $h_0$ affects several physical processes at different cosmic epochs, and multiple observables. we have counted m... | a tale of many $h_0$ |
we discuss a possible extension of calculations of the bending angle of light in a static, spherically symmetric and asymptotically flat spacetime to a nonasymptotically flat case. we examine a relation between the bending angle of light and the gauss-bonnet theorem by using the optical metric. a correspondence between... | gravitational bending angle of light for finite distance and the gauss-bonnet theorem |
much like ordinary matter, dark matter might consist of elementary particles, and weakly interacting massive particles are one of the prime suspects. during the past decade, the sensitivity of experiments trying to directly detect them has improved by three to four orders of magnitude, but solid evidence for their exis... | current status of direct dark matter detection experiments |
the rapid askap continuum survey (racs) is the first large-area survey to be conducted with the full 36-antenna australian square kilometre array pathfinder (askap) telescope. racs will provide a shallow model of the askap sky that will aid the calibration of future deep askap surveys. racs will cover the whole sky vis... | the rapid askap continuum survey i: design and first results |
the universe is magnetized on all scales probed so far. on the largest scales, galaxies and galaxy clusters host magnetic fields at the micro gauss level coherent on scales up to ten kpc. recent observational evidence suggests that even the intergalactic medium in voids could host a weak ∼ 10-16 gauss magnetic field, c... | the origin, evolution and signatures of primordial magnetic fields |
recent rapid progress in time domain surveys makes it possible to detect various types of explosive transients in the universe in large numbers, some of which will be gravitationally lensed into multiple images. although a large number of strongly lensed distant galaxies and quasars have already been discovered, strong... | strong gravitational lensing of explosive transients |
primordial black holes may have formed in the radiative era of the early universe from the collapse of large enough amplitude perturbations of the metric. these correspond to non linear energy density perturbations characterized by an amplitude larger than a certain threshold, measured when the perturbations reenter th... | threshold for primordial black holes: dependence on the shape of the cosmological perturbations |
models for light dark matter particles with masses below 1 gev/c^2 are a natural and well-motivated alternative to so-far unobserved weakly interacting massive particles. gram-scale cryogenic calorimeters provide the required detector performance to detect these particles and extend the direct dark matter search progra... | results on mev-scale dark matter from a gram-scale cryogenic calorimeter operated above ground |
detection of electron recoils by dark matter (dm) may reveal the structure of the dark sector. we consider a scenario where a heavier dm particle inelastically scatters off an electron and is converted into a lighter dm particle. a small mass difference between the two dm particles is transferred into electron recoil e... | inelastic dark matter electron scattering and the xenon1t excess |
we present rest-frame optical emission-line flux ratio measurements for five z > 5 galaxies observed by the james webb space telescope near-infared spectrograph (nirspec) in the smacs 0723 early release observations. we add several quality-control and post-processing steps to the nirspec pipeline reduction products ... | the physical conditions of emission-line galaxies at cosmic dawn from jwst/nirspec spectroscopy in the smacs 0723 early release observations |
observations of the submillimetre emission from galactic dust, in both total intensity i and polarization, have received tremendous interest thanks to the planck full-sky maps. in this paper we make use of such full-sky maps of dust polarized emission produced from the third public release of planck data. as the basis ... | planck 2018 results. xii. galactic astrophysics using polarized dust emission |
we investigate the observational consequences of a novel class of stable interacting dark energy (ide) models, featuring interactions between dark matter (dm) and dark energy (de). in the first part of our work, we start by considering two ide models which are known to present early-time linear perturbation instabiliti... | tale of stable interacting dark energy, observational signatures, and the h0 tension |
we present details of numerical simulations of the gravitational radiation produced by a first order thermal phase transition in the early universe. we confirm that the dominant source of gravitational waves is sound waves generated by the expanding bubbles of the low-temperature phase. we demonstrate that the sound wa... | numerical simulations of acoustically generated gravitational waves at a first order phase transition |
weak gravitational lensing, the deflection of light by mass, is one of the best tools to constrain the growth of cosmic structure with time and reveal the nature of dark energy. i discuss the sources of systematic uncertainty in weak lensing measurements and their theoretical interpretation, including our current under... | weak lensing for precision cosmology |
scattering amplitudes at weak coupling are highly constrained by lorentz invariance, locality and unitarity, and depend on model details only through coupling constants and particle content. in this paper, we develop an understanding of inflationary correlators which parallels that of flat-space scattering amplitudes. ... | the cosmological bootstrap: inflationary correlators from symmetries and singularities |
we present results from large-scale numerical simulations of a first order thermal phase transition in the early universe, in order to explore the shape of the acoustic gravitational wave and the velocity power spectra. we compare the results with the predictions of the recently proposed sound shell model. for the grav... | shape of the acoustic gravitational wave power spectrum from a first order phase transition |
we propose a new broadband search strategy for ultralight axion dark matter that interacts with electromagnetism. an oscillating axion field induces transitions between two quasidegenerate resonant modes of a superconducting cavity. in two broadband runs optimized for high and low masses, this setup can probe unexplore... | heterodyne broadband detection of axion dark matter |
the discrepancy in measurements of the hubble constant indicates new physics in dark energy, dark matter, or both. drawing inspiration from string theory, where axions interact with the other moduli fields, including the dilaton, here we demonstrate that the dynamics of an interacting dilaton and axion naturally realiz... | axion-dilaton destabilization and the hubble tension |
we review the production of gravitational waves by an electroweak first-order phase transition. the resulting signal is a good candidate for detection at next-generation gravitational wave detectors, such as lisa. detection of such a source of gravitational waves could yield information about physics beyond the standar... | gravitational waves from a first-order electroweak phase transition: a brief review |
the nanograv collaboration for the pulsar timing array (pta) observation recently announced evidence of an isotropic stochastic process, which may be the first detection of the stochastic gravitational-wave (gw) background. we discuss the possibility that the signal is caused by the second-order gws associated with the... | solar-mass primordial black holes explain nanograv hint of gravitational waves |
cosmological models in which dark matter consists of cold elementary particles predict that the dark halo population should extend to masses many orders of magnitude below those at which galaxies can form1-3. here we report a cosmological simulation of the formation of present-day haloes over the full range of observed... | universal structure of dark matter haloes over a mass range of 20 orders of magnitude |
the pseudo-cℓ is an algorithm for estimating the angular power and cross-power spectra that is very fast and in realistic cases also nearly optimal. the algorithm can be extended to deal with contaminant deprojection and e/b purification, and can therefore be applied in a wide variety of scenarios of interest for curre... | a unified pseudo-cℓ framework |
astrophysical and cosmological observations currently provide the only robust, empirical measurements of dark matter. future observations with large synoptic survey telescope (lsst) will provide necessary guidance for the experimental dark matter program. this white paper represents a community effort to summarize the ... | probing the fundamental nature of dark matter with the large synoptic survey telescope |
we compare the science capabilities of different elisa mission designs, including four-link (two-arm) and six-link (three-arm) configurations with different arm lengths, low-frequency noise sensitivities and mission durations. for each of these configurations we consider a few representative massive black hole formatio... | science with the space-based interferometer elisa: supermassive black hole binaries |
we report the first results of darkside-50, a direct search for dark matter operating in the underground laboratori nazionali del gran sasso (lngs) and searching for the rare nuclear recoils possibly induced by weakly interacting massive particles (wimps). the dark matter detector is a liquid argon time projection cham... | first results from the darkside-50\u2005dark matter experiment at laboratori nazionali del gran sasso |
the nanograv pulsar timing array experiment reported evidence for a stochastic common-spectrum process affecting pulsar timing residuals in its 12.5-yr data set, which might be interpreted as the first detection of a stochastic gravitational wave background (sgwb). i examine whether the nanograv signal might be explain... | implications of the nanograv results for inflation |
ultracompact dark matter (dm) minihalos at masses at and below 10-12 m⊙ arise in axion dm models where the peccei-quinn (pq) symmetry is broken after inflation. the minihalos arise from density perturbations that are generated from the nontrivial axion self-interactions during and shortly after the collapse of the axio... | early-universe simulations of the cosmological axion |
some gamma-ray bursts (grbs) have a tera–electron volt (tev) afterglow, but the early onset of this has not been observed. we report observations with the large high altitude air shower observatory (lhaaso) of the bright grb 221009a, which serendipitously occurred within the instrument’s field of view. more than 64,000... | a tera-electron volt afterglow from a narrow jet in an extremely bright gamma-ray burst. |
there are currently several existing and proposed experiments designed to probe sub-gev dark matter (dm) using electron ionization in various materials. the projected signal rates for these experiments assume that this ionization yield arises only from dm scattering directly off electron targets, ignoring secondary ion... | electron ionization via dark matter-electron scattering and the migdal effect |
mapping nearby galaxies at apache point observatory (manga) is an optical fiber-bundle integral-field unit (ifu) spectroscopic survey that is one of three core programs in the fourth-generation sloan digital sky survey (sdss-iv). with a spectral coverage of 3622-10354 å and an average footprint of ∼500 arcsec2 per ifu ... | the data reduction pipeline for the sdss-iv manga ifu galaxy survey |
this voyage 2050 paper highlights the unique science opportunities using spectral distortions of the cosmic microwave background (cmb). cmb spectral distortions probe many processes throughout the history of the universe, delivering novel information that complements past, present and future efforts with cmb anisotropy... | new horizons in cosmology with spectral distortions of the cosmic microwave background |
the giant radio array for neutrino detection (grand) is a planned large-scale observatory of ultra-high-energy (uhe) cosmic particles, with energies exceeding 108 gev. its goal is to solve the long-standing mystery of the origin of uhe cosmic rays. to do this, grand will detect an unprecedented number of uhe cosmic ray... | the giant radio array for neutrino detection (grand): science and design |
a fundamental property of the standard model is that the higgs potential becomes unstable at large values of the higgs field. for the current central values of the higgs and top masses, the instability scale is about 1011 gev and therefore not accessible by colliders. we show that a possible signature of the standard m... | a cosmological signature of the sm higgs instability: gravitational waves |
the region around the galactic center (gc) is now well established to be brighter at energies of a few gev than what is expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. we study the gev excess using 6.5 yr of data from the fermi large area telescope. we characteri... | the fermi galactic center gev excess and implications for dark matter |
the fermi large area telescope (lat) has provided the most detailed view to date of the emission toward the galactic center (gc) in high-energy γ-rays. this paper describes the analysis of data taken during the first 62 months of the mission in the energy range 1-100 gev from a 15° × 15° region about the direction of t... | fermi-lat observations of high-energy gamma-ray emission toward the galactic center |
one of the primary limiting sources of systematic uncertainty in forthcoming weak lensing measurements is systematic uncertainty in the quantitative relationship between the distortions due to gravitational lensing and the measurable properties of galaxy images. we present a statistically principled, general solution t... | metacalibration: direct self-calibration of biases in shear measurement |
the disagreement between direct late-time measurements of the hubble constant from the sh0es collaboration, and early-universe measurements based on the λcdm model from the planck collaboration might, at least in principle, be explained by new physics in the early universe. recently, the application of the effective fi... | the hubble tension in light of the full-shape analysis of large-scale structure data |
we revisit the impact of early dark energy (ede) on galaxy clustering using boss galaxy power spectra, analyzed using the effective field theory (eft) of large-scale structure (lss) and anisotropies of the cosmic microwave background (cmb) from planck. recent studies found that these data place stringent constraints on... | early dark energy is not excluded by current large-scale structure data |
we discuss several low-energy backgrounds to sub-gev dark-matter searches, which arise from high-energy particles of cosmic or radioactive origin that interact with detector materials. we focus, in particular, on cherenkov radiation, transition radiation, and luminescence or phonons from electron-hole pair recombinatio... | sources of low-energy events in low-threshold dark-matter and neutrino detectors |
we have used flux-transmission correlations in lyα forests to measure the imprint of baryon acoustic oscillations (bao). the study uses spectra of 157 783 quasars in the redshift range 2.1 ≤ z ≤ 3.5 from the sloan digital sky survey (sdss) data release 12 (dr12). besides the statistical improvements on our previous stu... | measurement of baryon acoustic oscillation correlations at z = 2.3 with sdss dr12 lyα-forests |
from a theoretical point of view, there is a strong motivation to consider an mev-scale reheating temperature induced by long-lived massive particles with masses around the weak scale, decaying only through gravitational interaction. in this study, we investigate lower limits on the reheating temperature imposed by big... | mev-scale reheating temperature and thermalization of oscillating neutrinos by radiative and hadronic decays of massive particles |
the cosmos-legacy survey is a 4.6 ms chandra program that has imaged 2.2 deg2 of the cosmos field with an effective exposure of ≃ 160 ks over the central 1.5 deg2 and of ≃ 80 ks in the remaining area. the survey is the combination of 56 new observations obtained as an x-ray visionary project with the previous c-cosmos ... | the chandra cosmos legacy survey: overview and point source catalog |
the cosmicflows database of galaxy distances that in the second edition contained 8188 entries is now expanded to 17,669 entries. the major additions are 2257 distances that we have derived from the correlation between galaxy rotation and luminosity with photometry at 3.6 μ {{m}} obtained with the spitzer space telesco... | cosmicflows-3 |
these lectures on the cosmological constant problem were prepared for the x mexican school on gravitation and mathematical physics. the problem itself is explained in detail, emphasising the importance of radiative instability and the need to repeatedly fine tune as we change our effective description. weinberg's no go... | lectures on the cosmological constant problem |
we investigate primordial perturbations and non-gaussianities in the hořava-lifshitz theory of gravitation. in the uv limit, the scalar perturbation in the hořava theory is naturally scale-invariant, ignoring the details of the expansion of the universe. one may thus relax the exponential inflation and the slow-roll co... | primordial perturbations and non-gaussianities in hořava-lifshitz gravity |
we derive efficiency factors for the production of gravitational waves through bubble collisions and plasma-related sources in strong phase transitions, and find the conditions under which the bubble collisions can contribute significantly to the signal. we use lattice simulations to clarify the dependence of the colli... | gravitational wave energy budget in strongly supercooled phase transitions |
measuring the morphological parameters of galaxies is a key requirement for studying their formation and evolution. surveys such as the sloan digital sky survey have resulted in the availability of very large collections of images, which have permitted population-wide analyses of galaxy morphology. morphological analys... | rotation-invariant convolutional neural networks for galaxy morphology prediction |
we combine dark energy survey year 1 clustering and weak lensing data with baryon acoustic oscillations and big bang nucleosynthesis experiments to constrain the hubble constant. assuming a flat λcdm model with minimal neutrino mass (∑mν = 0.06 ev), we find h_0=67.4^{+1.1}_{-1.2} {km s^{-1} mpc^{-1}} (68 per cent cl). ... | dark energy survey year 1 results: a precise h0 estimate from des y1, bao, and d/h data |
since the expansion of the universe was first established by edwin hubble and georges lemaître about a century ago, the hubble constant h0 which measures its rate has been of great interest to astronomers. besides being interesting in its own right, few properties of the universe can be deduced without it. in the last ... | a buyer's guide to the hubble constant |
the inspiral phase of gravitational waves emitted by spinless compact binary systems is derived through the fourth-and-a-half post-newtonian (4.5pn) order beyond quadrupole radiation, and the leading amplitude mode (ℓ,m )=(2 ,2 ) is obtained at 4pn order. we also provide the radiated flux, as well as the phase in the s... | gravitational-wave phasing of quasicircular compact binary systems to the fourth-and-a-half post-newtonian order |
since 2012 august voyager 1 has been observing the local interstellar energy spectra of galactic cosmic-ray nuclei down to 3 mev nuc-1 and electrons down to 2.7 mev. the h and he spectra have the same energy dependence between 3 and 346 mev nuc-1, with a broad maximum in the 10-50 mev nuc-1 range and a h/he ratio of 12... | galactic cosmic rays in the local interstellar medium: voyager 1 observations and model results |
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