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primordial black holes formed in the early universe via gravitational collapse of over-dense regions may contribute a significant amount to the present dark matter relic density. inflation provides a natural framework for the production mechanism of primordial black holes. for example, single field inflation models wit... | primordial black holes from gauss-bonnet-corrected single field inflation |
the standard model could be self-consistent up to the planck scale according to the present measurements of the higgs boson mass and top quark yukawa coupling. it is therefore possible that new physics is only coupled to the standard model through planck suppressed higher dimensional operators. in this case the weakly ... | planckian interacting massive particles as dark matter |
the λcdm model provides a good fit to most astronomical observations but harbors large areas of phenomenology and ignorance. with the improvements in the precision and number of observations, discrepancies between key cosmological parameters of this model have emerged. among them, the most notable tension is the 4σ to ... | hubble tension: the evidence of new physics |
the mysterious dark energy remains one of the greatest puzzles of modern science. current detections for it are mostly indirect. the spacetime effects of dark energy can be locally described by the sds wmetric. understanding these local effects exactly is an essential step toward the direct probe of dark energy. from f... | geometrization of light bending and its application to sds wspacetime |
context. the agn bolometric correction is a key element for understanding black hole (bh) demographics and computing accurate bh accretion histories from agn luminosities. however, current estimates still differ from each other by up to a factor of two to three, and rely on extrapolations at the lowest and highest lumi... | universal bolometric corrections for active galactic nuclei over seven luminosity decades |
photometric redshifts are a key component of many science objectives in the hyper suprime-cam subaru strategic program (hsc-ssp). in this paper, we describe and compare the codes used to compute photometric redshifts for hsc-ssp, how we calibrate them, and the typical accuracy we achieve with the hsc five-band photomet... | photometric redshifts for hyper suprime-cam subaru strategic program data release 1 |
we present a suite of 18 synthetic sky catalogs designed to support science analysis of galaxies in the dark energy survey year 1 (des y1) data. for each catalog, we use a computationally efficient empirical approach, addgals, to embed galaxies within light-cone outputs of three dark matter simulations that resolve hal... | the buzzard flock: dark energy survey synthetic sky catalogs |
quantum scale symmetry is the realization of scale invariance in a quantum field theory. no parameters with dimension of length or mass are present in the quantum effective action. quantum scale symmetry is generated by quantum fluctuations via the presence of fixed points for running couplings. as for any global symme... | quantum scale symmetry |
we study the theory and phenomenology of massive spin-2 fields during the inflation with nonzero background chemical potential, and extend the cosmological collider physics to tensor modes. we identify a unique dimension-5 and parity-violating chemical potential operator for massive spin-2 fields, which leads to a ghos... | large spin-2 signals at the cosmological collider |
in this white paper, we present the megamapper concept. the megamapper is a proposed ground-based experiment to measure inflation parameters and dark energy from galaxy redshifts at $2<z<5$. in order to achieve path-breaking results with a mid-scale investment, the megamapper combines existing technologies for cr... | the megamapper: a stage-5 spectroscopic instrument concept for the study of inflation and dark energy |
quasars are galaxies hosting accreting supermassive black holes; due to their brightness, they are unique probes of the early universe. to date, only a few quasars have been reported at z> 6.5 (<800 myr after the big bang). in this work, we present six additional z≳ 6.5 quasars discovered using the pan-starrs1 su... | physical properties of 15 quasars at z ≳ 6.5 |
we report the results of near-infrared spectroscopic observations of 37 quasars in the redshift range 6.3 < z ≤ 7.64, including 32 quasars at z > 6.5, forming the largest quasar near-infrared spectral sample at this redshift. the spectra, taken with keck, gemini, vlt, and magellan, allow investigations of central... | probing early supermassive black hole growth and quasar evolution with near-infrared spectroscopy of 37 reionization-era quasars at 6.3 < z ≤ 7.64 |
we consider gravity mediated by non-metricity, with vanishing curvature and torsion. the gravitational action, including an arbitrary function of the non-metric scalar, is investigated in view of characterizing the dark energy effects. in particular, we present a method to reconstruct the f (q) action without resorting... | model-independent reconstruction of f(q) non-metric gravity |
cosmological observations are used to test for imprints of an ultralight axionlike field (ula), with a range of potentials v (ϕ )∝[1 -cos (ϕ /f )]n set by the axion-field value ϕ and decay constant f . scalar field dynamics dictate that the field is initially frozen and then begins to oscillate around its minimum when ... | cosmological implications of ultralight axionlike fields |
the edelweiss collaboration has performed a search for dark matter particles with masses below the gev scale with a 33.4-g germanium cryogenic detector operated in a surface lab. the energy deposits were measured using a neutron-transmutation-doped ge thermal sensor with a 17.7 ev (rms) baseline heat energy resolution ... | searching for low-mass dark matter particles with a massive ge bolometer operated above ground |
we study the production of primordial black hole (pbh) binaries and the resulting merger rate, accounting for an extended pbh mass function and the possibility of a clustered spatial distribution. under the hypothesis that the gravitational wave events observed by ligo were caused by pbh mergers, we show that it is pos... | gravitational waves from primordial black hole mergers |
this paper presents an overview of the polarized sky as seen by planck hfi at 353 ghz, which is the most sensitive planck channel for dust polarization. we construct and analyse maps of dust polarization fraction and polarization angle at 1° resolution, taking into account noise bias and possible systematic effects. th... | planck intermediate results. xix. an overview of the polarized thermal emission from galactic dust |
within the standard three-neutrino framework, the absolute neutrino masses and their ordering (either normal, no, or inverted, io) are currently unknown. however, the combination of current data coming from oscillation experiments, neutrinoless double beta (0 ν β β ) decay searches, and cosmological surveys, can provid... | global constraints on absolute neutrino masses and their ordering |
an important unsolved problem that affects practically all attempts to connect string theory to cosmology and phenomenology is how to distinguish effective field theories belonging to the string landscape from those that are not consistent with a quantum theory of gravity at high energies (the "string swampland"). it w... | the string swampland constraints require multi-field inflation |
we present the unwise catalog, containing the positions and fluxes of roughly 2 billion objects observed by the wide-field infrared survey explorer (wise) over the full sky. the unwise catalog has two advantages over the existing wise catalog (allwise): first, it is based on significantly deeper imaging, and second, it... | the unwise catalog: two billion infrared sources from five years of wise imaging |
using a 10d lift of nonperturbative volume stabilization in type iib string theory, we study the limitations for obtaining de sitter vacua. based on this we find that the simplest kachru, kallosh, linde, and trivedi vacua with a single kähler modulus stabilized by a gaugino condensate cannot be uplifted to de sitter. r... | toward de sitter space from ten dimensions |
we consider single-field inflation in light of string-motivated ‘swampland’ conjectures suggesting that effective scalar field theories with a consistent uv completion must have field excursion , in combination with a sufficiently steep potential, . here, we show that the swampland conjectures are inconsistent with exi... | the zoo plot meets the swampland: mutual (in)consistency of single-field inflation, string conjectures, and cosmological data |
we present a set of tools to assess the capabilities of lisa to detect and reconstruct the spectral shape and amplitude of a stochastic gravitational wave background (sgwb) . we first provide the lisa power-law sensitivity curve and binned power-law sensitivity curves, based on the latest updates on the lisa design. th... | reconstructing the spectral shape of a stochastic gravitational wave background with lisa |
this white paper envisions a revolutionary post-desi, post-lsst dark energy program based on intensity mapping of the redshifted 21cm emission line from neutral hydrogen at radio frequencies. the proposed intensity mapping survey has the unique capability to quadruple the volume of the universe surveyed by optical prog... | inflation and early dark energy with a stage ii hydrogen intensity mapping experiment |
we introduce darkbit, an advanced software code for computing dark matter constraints on various extensions to the standard model of particle physics, comprising both new native code and interfaces to external packages. this release includes a dedicated signal yield calculator for gamma-ray observations, which signific... | darkbit: a gambit module for computing dark matter observables and likelihoods |
we consider the production of matter and radiation during reheating after inflation, restricting our attention solely to gravitational interactions. processes considered are the exchange of a graviton, hμ ν , involved in the scattering of the inflaton or particles in the newly created radiation bath. in particular, we ... | gravitational portals in the early universe |
we analyze phase transitions in the minimal extension of the sm with a real singlet scalar field. the novelty of our study is that we identify and analyze in detail the region of parameter space where the first order phase transition can occur and in particular when the bubbles with true vacuum can reach relativistic v... | ultra-relativistic bubbles from the simplest higgs portal and their cosmological consequences |
we study direct detection bounds on cosmic ray-upscattered dark matter in simplified models including light mediators. we find that the energy dependence in the scattering cross section is significant, and produces stronger bounds than previously found (which assumed constant cross sections) by many orders of magnitude... | bounds on cosmic ray-boosted dark matter in simplified models and its corresponding neutrino-floor |
despite solid theoretical and observational grounds for the pairing of supermassive black holes (smbhs) after galaxy mergers, definitive evidence for the existence of close (sub-parsec) separation smbh binaries (smbhbs) approaching merger is yet to be found. this chapter reviews techniques aimed at discovering such smb... | observational signatures of supermassive black hole binaries |
we constrain six possible extensions to the λ cold dark matter (cdm) model using measurements from the dark energy survey's first three years of observations, alone and in combination with external cosmological probes. the des data are the two-point correlation functions of weak gravitational lensing, galaxy clustering... | dark energy survey year 3 results: constraints on extensions to λ cdm with weak lensing and galaxy clustering |
the standard cosmological model predicts statistically isotropic cosmic microwave background (cmb) fluctuations. however, several summary statistics of cmb isotropy have anomalous values, including: the low level of large-angle temperature correlations, $s_{1/2}$; the excess power in odd versus even low-$\ell$ multipol... | the universe is not statistically isotropic |
we present an overview of the design and status of the polarbear-2 and the simons array experiments. polarbear-2 is a cosmic microwave background polarimetry experiment which aims to characterize the arc-minute angular scale b-mode signal from weak gravitational lensing and search for the degree angular scale b-mode si... | the polarbear-2 and the simons array experiments |
the standard siren approach of gravitational wave cosmology appeals to the direct luminosity distance estimation through the waveform signals from inspiralling double compact binaries, especially those with electromagnetic counterparts providing redshifts. it is limited by the calibration uncertainties in strain amplit... | precision cosmology from future lensed gravitational wave and electromagnetic signals |
the recently obtained hairy kerr black holes, due to additional sources or surrounding fluid, like dark matter, with conserved energy-momentum tensor, have a deviation α and primary hair l0, apart from rotation parameter a and mass m. in the wake of the event horizon telescope (eht) observations of the supermassive bla... | parameter estimation of hairy kerr black holes from its shadow and constraints from m87* |
we present and characterize the galaxy shape catalogue from the first 3 yr of dark energy survey (des) observations, over an effective area of 4143 deg2 of the southern sky. we describe our data analysis process and our self-calibrating shear measurement pipeline metacalibration, which builds and improves upon the pipe... | dark energy survey year 3 results: weak lensing shape catalogue |
in this paper, we discuss the possible effects of dark matter on a schwarzschild black hole with the correction of extended uncertainty principle (eup), such as the parameter α and the large fundamental length scale l∗. in particular, we surround the eup black hole of mass m with a static spherical shell of dark matter... | shadow and weak deflection angle of extended uncertainty principle black hole surrounded with dark matter |
we constrain effective field theories by going beyond the familiar positivity bounds that follow from unitarity, analyticity, and crossing symmetry of the scattering amplitudes. as interesting examples, we discuss the implications of the bounds for the galileon and ghost-free massive gravity. the combination of our the... | beyond positivity bounds and the fate of massive gravity |
we present the vla-cosmos 3 ghz large project based on 384 h of observations with the karl g. jansky very large array (vla) at 3 ghz (10 cm) toward the two square degree cosmic evolution survey (cosmos) field. the final mosaic reaches a median rms of 2.3 μjy beam-1 over the two square degrees at an angular resolution o... | the vla-cosmos 3 ghz large project: continuum data and source catalog release |
this report summarises progress made in estimating the local density of dark matter (ρdm,⊙), a quantity that is especially important for dark matter direct detection experiments. we outline and compare the most common methods to estimate ρdm,⊙ and the results from recent studies, including those that have benefited fro... | dark matter local density determination: recent observations and future prospects |
femtolensing of gamma ray bursts (grbs) has been put forward as an exciting possibility to probe exotic astrophysical objects with masses below 10-13 solar masses such as small primordial black holes or ultra-compact dark matter minihalos, made up for instance of qcd axions. in this paper we critically review this idea... | femtolensing by dark matter revisited |
we present a comprehensive analysis of the evolution of the morphological and structural properties of a large sample of galaxies at z = 3-9 using early james webb space telescope (jwst) ceers nircam observations. our sample consists of 850 galaxies at z > 3 detected in both hubble space telescope (hst)/wfc3 and cee... | ceers key paper. iii. the diversity of galaxy structure and morphology at z = 3-9 with jwst |
composed of ultralight bosons, fuzzy dark matter provides an intriguing solution to challenges that the standard cold dark matter model encounters on subgalactic scales. the ultralight dark matter with mass m ∼10-23 ev will induce a periodic oscillation in gravitational potentials with a frequency in the nanohertz band... | constraining ultralight vector dark matter with the parkes pulsar timing array second data release |
we analyze the phase transition in improved holographic qcd to obtain an estimate of the gravitational wave signal emitted in the confinement transition of a pure su(3) yang-mills dark sector. we derive the effective action from holography and show that the energy budget and duration of the phase transition can be calc... | gravitational waves from dark su(3) yang-mills theory |
the edges collaboration has recently reported the detection of a stronger-than-expected absorption feature in the global 21-cm spectrum, centered at a frequency corresponding to a redshift of z ≃17 . this observation has been interpreted as evidence that the gas was cooled during this era as a result of scattering with... | severely constraining dark-matter interpretations of the 21-cm anomaly |
we report the results from a haloscope search for axion dark matter in the $3.3\text{-}4.2~{\mu}$ev mass range. this search excludes the axion-photon coupling predicted by one of the benchmark models of "invisible" axion dark matter, the ksvz model. this sensitivity is achieved using a large-volume cavity, a supercondu... | search for "invisible" axion dark matter in the $3.3\\text{-}4.2~{\\mu}$ev mass range |
there has recently been renewed interest in the possibility that the dark matter in the universe consists of primordial black holes (pbhs). current observational constraints leave only a few pbh mass ranges for this possibility. one of them is around 10-12 m⊙ . if pbhs with this mass are formed due to an enhanced scala... | primordial black hole dark matter: lisa serendipity |
the λ cold dark matter model (λcdm) represents the current standard model in cosmology. within this, there is a tension between the value of the hubble constant, h0, inferred from local distance indicators and the angular scale of fluctuations in the cosmic microwave background (cmb). in terms of bayseian evidence, we ... | does the hubble constant tension call for new physics? |
in canonical single-field inflation, the production of primordial black holes (pbh) requires a transient violation of the slow-roll condition. the transient ultra slow-roll inflation is an example of such scenarios, and more generally, one can consider the transient constant-roll inflation. we investigate the squeezed ... | squeezed bispectrum and one-loop corrections in transient constant-roll inflation |
polarization of the cosmic microwave background (cmb) is sensitive to new physics violating parity symmetry, such as the presence of a pseudoscalar "axionlike" field. such a field may be responsible for early dark energy (ede), which is active prior to recombination and provides a solution to the so-called hubble tensi... | constraints on early dark energy from isotropic cosmic birefringence |
the hubble tension between the λcdm-model-dependent prediction of the current expansion rate h0 using planck data and direct, model-independent measurements in the local universe from the sh0es collaboration disagree at >3.5σ. moreover, there exists a milder ~ 2σ tension between similar predictions for the amplitude... | alleviating the h0 and σ8 anomalies with a decaying dark matter model |
liquid argon is a bright scintillator with potent particle identification properties, making it an attractive target for direct-detection dark matter searches. the darkside-50 dark matter search here reports the first wimp search results obtained using a target of low-radioactivity argon. darkside-50 is a dark matter d... | results from the first use of low radioactivity argon in a dark matter search |
determining the distribution of redshifts of galaxies observed by wide-field photometric experiments like the dark energy survey (des) is an essential component to mapping the matter density field with gravitational lensing. in this work we describe the methods used to assign individual weak lensing source galaxies fro... | dark energy survey year 3 results: redshift calibration of the weak lensing source galaxies |
early dark energy (ede) offers a particularly interesting theoretical approach to the hubble tension, albeit one that introduces its own set of challenges, including a new "why then" problem related to the ede injection time at matter-radiation equality, and a mild worsening of the large-scale structure (lss) tension. ... | chameleon early dark energy and the hubble tension |
we present an optimized variant of the halo model, designed to produce accurate matter power spectra well into the non-linear regime for a wide range of cosmological models. to do this, we introduce physically motivated free parameters into the halo-model formalism and fit these to data from high-resolution n-body simu... | an accurate halo model for fitting non-linear cosmological power spectra and baryonic feedback models |
we present the results of a systematic search for candidate quiescent galaxies in the distant universe in 11 jwst fields with publicly available observations collected during the first 3 months of operations and covering an effective sky area of ~145 arcmin2. we homogeneously reduce the new jwst data and combine them w... | an atlas of color-selected quiescent galaxies at z > 3 in public jwst fields |
we present a public catalog of transients from the zwicky transient facility (ztf) bright transient survey, a magnitude-limited (m < 19 mag in either the g or r filter) survey for extragalactic transients in the ztf public stream. we introduce cuts on survey coverage, sky visibility around peak light, and other prop... | the zwicky transient facility bright transient survey. ii. a public statistical sample for exploring supernova demographics |
perturbation theory alone fails to describe thermodynamics of the electroweak phase transition. we review a technique combining perturbative and non-perturbative methods to overcome this challenge. accordingly, the principal theme is a tutorial of hightemperature dimensional reduction. we present an explicit derivatio... | robust approach to thermal resummation: standard model meets a singlet |
we present a systematic analysis of the x-ray emission of a sample of 17 optically selected, x-ray-detected tidal disruption events (tdes) discovered between 2014 and 2021. the x-ray light curves show a diverse range of temporal behaviors, with most sources not following the expected power-law decline. the x-ray spectr... | a systematic analysis of the x-ray emission in optically selected tidal disruption events: observational evidence for the unification of the optically and x-ray selected populations |
spectra of the highest redshift galaxies taken with jwst are now allowing us to see into the heart of the reionization epoch. many of these observed galaxies exhibit strong damping wing absorption redward of their lyman-$\alpha$ emission. these observations have been used to measure the redshift evolution of the neutra... | jwst observations of galaxy damping wings during reionization interpreted with cosmological simulations |
high-resolution james webb space telescope (jwst) observations can test confusion-limited hubble space telescope (hst) observations for a photometric bias that could affect extragalactic cepheids and the determination of the hubble constant. we present jwst nircam observations in two epochs and three filters of >320... | crowded no more: the accuracy of the hubble constant tested with high-resolution observations of cepheids by jwst |
the optically thin critical densities and the effective excitation densities to produce a 1 k km/s (or 0.818 jy km/s $(\frac{\nu_{jk}}{100 \rm{ghz}})^2 \, (\frac{\theta_{beam}}{10^{\prime\prime}})^2$) spectral line are tabulated for 12 commonly observed dense gas molecular tracers. the dependence of the critical densit... | the critical density and the effective excitation density of commonly observed molecular dense gas tracers |
we study the possible gravitational wave signal and the viability of baryogenesis arising from the electroweak phase transition in an extension of the standard model (sm) by a scalar singlet field without a &z;2 symmetry. we first analyze the velocity of the expanding true-vacuum bubbles during the phase transition, co... | the scalar singlet extension of the standard model: gravitational waves versus baryogenesis |
the pulsar timing array (pta) collaborations have recently suggested the presence of a gravitational wave background at nano-hertz frequencies. in this paper, we explore potential inflationary interpretation of this signal within the context of a simple and health parity-violating gravity model termed the nieh-yan modi... | explaining pulsar timing array observations with primordial gravitational waves in parity-violating gravity |
we search for strongly lensed and multiply imaged gravitational wave signals in the second observing run of advanced ligo and advanced virgo (o2). we exploit a new source of information, the so-called morse phase, which further mitigates the search background and constrains viable lenses. the best candidate we find is ... | search for lensed gravitational waves including morse phase information: an intriguing candidate in o2 |
we perform a combined analysis of cosmic shear tomography, galaxy-galaxy lensing tomography, and redshift-space multipole power spectra (monopole and quadrupole) using 450 deg2 of imaging data by the kilo degree survey (kids-450) overlapping with two spectroscopic surveys: the 2-degree field lensing survey (2dflens) an... | kids-450 + 2dflens: cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering |
several unexpected features have been observed in the microwave sky at large angular scales, both by wmap and by planck. among those features is a lack of both variance and correlation on the largest angular scales, alignment of the lowest multipole moments with one another and with the motion and geometry of the solar... | cmb anomalies after planck |
two experiments from the fermilab, e989 and cdf ii, have reported two anomalies for muon g - 2 and w-boson mass that may indicate the new physics at the low energy scale. here we examine the possibility of a common origin of these two anomalies in the next-to-minimal supersymmetric standard model. considering various e... | nmssm neutralino dark matter for cdf ii w-boson mass and muon g - 2 and the promising prospect of direct detection |
we heal the cosmological constant problem by means of a cancellation mechanism that adopts a phase transition during which quantum fluctuations are eliminated. to this purpose, we propose that a generalized scalar (dark) matter field with a non-vanishing pressure term can remove the vacuum energy contribution, if its c... | healing the cosmological constant problem during inflation through a unified quasi-quintessence matter field |
combining the stochastic and formalisms, we derive non-perturbative analytical expressions for all correlation functions of scalar perturbations in single-field, slow-roll inflation. the standard, classical formulas are recovered as saddle-point limits of the full results. this yields a classicality criterion that show... | correlation functions in stochastic inflation |
the concordance of the λcdm cosmological model in light of current observations has been the subject of an intense debate in recent months. the 2018 planck cosmic microwave background (cmb) temperature anisotropy power spectrum measurements appear at face value to favour a spatially closed universe with curvature param... | the galaxy power spectrum take on spatial curvature and cosmic concordance |
primordial black holes (pbhs) can be produced by a range of mechanisms in the early universe. a particular formation channel that connects pbhs with inflationary phenomenology invokes enhanced primordial curvature perturbations at small scales. in this paper, we re-examine the impact of the growth of the primordial pow... | steepest growth re-examined: repercussions for primordial black hole formation |
we report the detection of a high density of redshift z ≈ 10 galaxies behind the foreground cluster a2744, selected from imaging data obtained recently with nircam on board jwst by three programs-glass-jwst, uncover, and ddt#2756. to ensure robust estimates of the lensing magnification μ, we use an improved version of ... | early results from glass-jwst. xix. a high density of bright galaxies at z ≈ 10 in the a2744 region |
to gain understanding of the complicated, non-linear, and numerical processes associated with the tidal evolution of dark matter subhaloes in numerical simulation, we perform a large suite of idealized simulations that follow individual n-body subhaloes in a fixed, analytical host halo potential. by varying both physic... | dark matter substructure in numerical simulations: a tale of discreteness noise, runaway instabilities, and artificial disruption |
we study cosmic-ray-atmosphere collisions as a permanent production source of exotic millicharged particles (mcps) for all terrestrial experiments. [mcps are also known as charged massive particles (champs).] based on data from super-k, this allows us to derive new limits on mcps that are competitive with, or improve, ... | constraints on millicharged particles from cosmic-ray production |
the search for the curl component (b mode) in the cosmic microwave background (cmb) polarization induced by inflationary gravitational waves is described. the canonical single-field slow-roll model of inflation is presented, and we explain the quantum production of primordial density perturbations and gravitational wav... | the quest for b modes from inflationary gravitational waves |
detection of the icecube-170922a neutrino coincident with the flaring blazar txs 0506+056, the first and only ∼3σ high-energy neutrino source association to date, offers a potential breakthrough in our understanding of high-energy cosmic particles and blazar physics. we present a comprehensive analysis of txs 0506+056 ... | a multimessenger picture of the flaring blazar txs 0506+056: implications for high-energy neutrino emission and cosmic-ray acceleration |
the central radio source in m87 provides the best opportunity to study jet formation because it has a large angular size for the gravitational radius of the black hole and has a bright jet that is well resolved by very long baseline interferometry observations. we present intensive monitoring observations from 2007 and... | the structure and dynamics of the subparsec jet in m87 based on 50 vlba observations over 17 years at 43 ghz |
the recent observation of the shadow of the supermassive black hole m87*, located at the center of the m87 galaxy, by the event horizon telescope collaboration has opened up a new window to probe the strong gravity regime. in this paper, we explicitly demonstrate the consequences of this observation on brane world blac... | silhouette of m87*: a new window to peek into the world of hidden dimensions |
we develop an exact formalism for the computation of the abundance of primordial black holes (pbhs) in the presence of local non-gaussianity (ng) in the curvature perturbation field. for the first time, we include ng going beyond the widely used quadratic and cubic approximations, and consider a completely generic func... | primordial non-gaussianity up to all orders: theoretical aspects and implications for primordial black hole models |
the stochastic gravitational wave background (sgwb) detected recently by the pulsar timing arrays (ptas) observations may have cosmological origins. in this work we consider a model of single field inflation containing an intermediate phase of ultra slow-roll. fixing the amplitude of the peak of curvature perturbations... | induced gravitational waves from ultra slow-roll inflation and pulsar timing arrays observations |
we present the results obtained from the full-shape cosmology analysis of the redshift-space power spectra for four galaxy samples of the sdss-iii boss dr12 galaxy catalog over 0.2 <z <0.75 . for the theoretical template, we use an emulator that was built from an ensemble set of n -body simulations, which enables... | full-shape cosmology analysis of the sdss-iii boss galaxy power spectrum using an emulator-based halo model: a 5% determination of σ8 |
we survey systematically the general parametrisations of particle-physics models for a first-order phase transition in the early universe, including models with polynomial potentials both with and without barriers at zero temperature, and coleman-weinberg-like models with potentials that are classically scale-invariant... | gravitational waves from first-order cosmological phase transitions: lifetime of the sound wave source |
using γ -ray data from the fermi large area telescope, various groups have identified a clear excess emission in the inner galaxy, at energies around a few gev. this excess resembles remarkably well a signal from dark-matter annihilation. one of the most compelling astrophysical interpretations is that the excess is ca... | strong support for the millisecond pulsar origin of the galactic center gev excess |
the kilo-degree survey (kids) is a multi-band imaging survey designed for cosmological studies from weak lensing and photometric redshifts. it uses the european southern observatory vlt survey telescope with its wide-field camera omegacam. kids images are taken in four filters similar to the sloan digital sky survey ug... | gravitational lensing analysis of the kilo-degree survey |
for primordial black holes (pbh) to be the dark matter in single-field inflation, the slow-roll approximation must be violated by at least o (1 ) in order to enhance the curvature power spectrum within the required number of e -folds between cosmic microwave background scales and pbh mass scales. power spectrum predict... | primordial black holes and slow-roll violation |
this paper reviews scalar-tensor theories characterized by a lagrangian that, despite the presence of second-order derivatives, contains a single scalar degree of freedom. these theories, known as degenerate higher-order scalar-tensor (dhost) theories, include horndeski and beyond horndeski theories. they propagate a s... | dark energy and modified gravity in degenerate higher-order scalar-tensor (dhost) theories: a review |
cosmological observations are a powerful probe of neutrino properties, and in particular of their mass. in this review, we first discuss the role of neutrinos in shaping the cosmological evolution at both the background and perturbation level, and describe their effects on cosmological observables such as the cosmic mi... | status of neutrino properties and future prospects - cosmological and astrophysical constraints |
we present galaxy zoo decals: detailed visual morphological classifications for dark energy camera legacy survey images of galaxies within the sdss dr8 footprint. deeper decals images (r = 23.6 versus r = 22.2 from sdss) reveal spiral arms, weak bars, and tidal features not previously visible in sdss imaging. to best e... | galaxy zoo decals: detailed visual morphology measurements from volunteers and deep learning for 314 000 galaxies |
we review the field of collisionless numerical simulations for the large-scale structure of the universe. we start by providing the main set of equations solved by these simulations and their connection with general relativity. we then recap the relevant numerical approaches: discretization of the phase-space distribut... | large-scale dark matter simulations |
is dark matter part of a dark sector? the possibility of a dark sector neutral under standard model (sm) forces furnishes an attractive explanation for the existence of dark matter (dm), and is a compelling new-physics direction to explore in its own right, with potential relevance to fundamental questions as varied as... | dark sector physics at high-intensity experiments |
any abundance of black holes that was present in the early universe will evolve as matter, making up an increasingly large fraction of the total energy density as space expands. this motivates us to consider scenarios in which the early universe included an era that was dominated by low-mass ($m < 5\times 10^8$ g) b... | hot gravitons and gravitational waves from kerr black holes in the early universe |
we analyze the parsec-scale jet kinematics from 2007 june to 2013 january of a sample of γ-ray bright blazars monitored roughly monthly with the very long baseline array at 43 ghz. in a total of 1929 images, we measure apparent speeds of 252 emission knots in 21 quasars, 12 bl lacertae objects (bllacs), and 3 radio gal... | kinematics of parsec-scale jets of gamma-ray blazars at 43 ghz within the vlba-bu-blazar program |
we present large-scale structure catalogues from the completed extended baryon oscillation spectroscopic survey (eboss). derived from sloan digital sky survey (sdss) iv data release 16 (dr16), these catalogues provide the data samples, corrected for observational systematics, and random positions sampling the survey se... | the completed sdss-iv extended baryon oscillation spectroscopic survey: large-scale structure catalogues for cosmological analysis |
in this work, we consider an extension of symmetric teleparallel gravity, namely, f (q ) gravity, where the fundamental block to describe spacetime is the nonmetricity, q . within this formulation of gravitation, we perform an observational analysis of several modified f (q ) models using the redshift approach, where t... | observational constraints of f (q ) gravity |
gravitational-wave observations of extreme mass ratio inspirals (emris) offer the opportunity to probe the environments of active galactic nuclei (agn) through the torques that accretion disks induce on the binary. within a bayesian framework, we study how well such environmental effects can be measured using gravitati... | probing accretion physics with gravitational waves |
we present constraints on extensions to the standard cosmological model of a spatially flat universe governed by general relativity, a cosmological constant (λ), and cold dark matter (cdm) by varying the spatial curvature ωk, the sum of the neutrino masses ∑mν, the dark energy equation of state parameter w, and the hu-... | kids-1000 cosmology: constraints beyond flat λcdm |
we derive a lower bound on the merger rate of primordial black hole (pbh) binaries by estimating the maximal fraction of binaries that were perturbed between formation in the early universe and merger, and computing a conservative merger rate of perturbed binaries. this implies robust constraints on the pbh abundance i... | lower bound on the primordial black hole merger rate |
we outline the science motivation for sgso, the southern gamma-ray survey observatory. sgso will be a next-generation wide field-of-view gamma-ray survey instrument, sensitive to gamma-rays in the energy range from 100 gev to hundreds of tev. its science topics include unveiling galactic and extragalactic particle acce... | science case for a wide field-of-view very-high-energy gamma-ray observatory in the southern hemisphere |
late times dark energy transitions at redshifts z ≪0.1 can raise the predicted value of the hubble constant to the sh0es value, 74.03 ±1.42 (km s-1 mpc-1) or more, while providing an equally good fit as λ cdm at 67.73 ±0.41 to higher redshift data, in particular from the cosmic microwave background and baryon acoustic ... | can late dark energy transitions raise the hubble constant? |
we use redshift-space galaxy clustering data from the boss survey to constrain local primordial non-gaussianity (lpng). this is of particular importance due to the consistency relations, which imply that a detection of lpng would rule out all single-field inflationary models. our constraints are based on the consistent... | constraints on multifield inflation from the boss galaxy survey |
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