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this lecture note provides a generic introduction to reheating after inflation, covering theoretical, phenomenological and observational aspects of the process. | lectures on reheating after inflation |
even if massive (10 m⊙≲m ≲104m⊙ ) primordial black holes (pbhs) can only account for a small fraction of the dark matter (dm) in the universe, they may still be responsible for a sizable fraction of the coalescence events measured by ligo/virgo, and/or act as progenitors of the supermassive black holes (smbhs) observed... | cosmic microwave background bounds on primordial black holes including dark matter halo accretion |
we study quantum field theory on a de sitter spacetime ds$_{d+1}$ background. our main tool is the hilbert space decomposition in irreducible unitary representations of its isometry group $so(d+1,1)$. as the first application of the hilbert space formalism, we recover the källen-lehmann spectral decomposition of the sc... | towards the non-perturbative cosmological bootstrap |
the separate-universe approach gives an intuitive way to understand the evolution of cosmological perturbations in the long-wavelength limit. it uses solutions of the spatially-homogeneous equations of motion to model the evolution of the inhomogeneous universe on large scales. we show that the separate-universe approa... | the separate-universe approach and sudden transitions during inflation |
we study experimental and cosmological constraints on the extension of the standard model by three right handed neutrinos with masses between those of the pion and w boson. we combine for the first time direct, indirect and cosmological constraints in this mass range. this includes experimental constraints from neutrin... | combining experimental and cosmological constraints on heavy neutrinos |
we present the public data release of the abacussummit cosmological n-body simulation suite, produced with the abacus n-body code on the summit supercomputer of the oak ridge leadership computing facility. abacus achieves $\mathcal {o}(10^{-5})$ median fractional force error at superlative speeds, calculating 70m parti... | abacussummit: a massive set of high-accuracy, high-resolution n-body simulations |
theories of modified gravity, where light scalars with non-trivial self-interactions and non-minimal couplings to matter—chameleon and symmetron theories—dynamically suppress deviations from general relativity in the solar system. on other scales, the environmental nature of the screening means that such scalars may be... | tests of chameleon gravity |
primordial black holes could have been formed in the early universe from nonlinear cosmological perturbations reentering the cosmological horizon when the universe was still radiation dominated. starting from the shape of the power spectrum on superhorizon scales, we provide a simple prescription, based on the results ... | threshold for primordial black holes. ii. a simple analytic prescription |
we have constructed all-sky compton parameters maps, y-maps, of the thermal sunyaev-zeldovich (tsz) effect by applying specifically tailored component separation algorithms to the 30 to 857 ghz frequency channel maps from the planck satellite. these reconstructed y-maps are delivered as part of the planck 2015 release.... | planck 2015 results. xxii. a map of the thermal sunyaev-zeldovich effect |
a revised catalogue of galactic supernova remnants (snrs) is presented, along with some simple statistics of their properties. six new snrs have been added to the catalogue since the previous published version from 2014, and six entries have been removed, as they have been identified as h ii regions, leaving the number... | a revised catalogue of 294 galactic supernova remnants |
we study new consistent scalar-tensor theories of gravity recently introduced by langlois and noui with potentially interesting cosmological applications. we derive the conditions for the existence of a primary constraint that prevents the propagation of an additional dangerous mode associated with higher order equatio... | extended scalar-tensor theories of gravity |
we identify a scalar-tensor model embedded in the horndeski action whose cosmological background and linear scalar fluctuations are degenerate with the concordance cosmology. the model admits a self-accelerated background expansion at late times that is stable against perturbations with a sound speed attributed to the ... | breaking a dark degeneracy with gravitational waves |
ultra-low mass primordial black holes (pbh), which may briefly dominate the energy density of the universe but completely evaporate before the big bang nucleosynthesis (bbn), can lead to interesting observable signatures. in our previous work, we studied the generation of a doubly peaked spectrum of induced stochastic ... | distinct signatures of spinning pbh domination and evaporation: doubly peaked gravitational waves, dark relics and cmb complementarity |
we study gravitational wave (gw) production in strongly supercooled cosmological phase transitions, taking particular care of models featuring a complex scalar field with a u(1) symmetric potential. we perform lattice simulations of two-bubble collisions to properly model the scalar field gradients, and compute the gw ... | gravitational wave spectra from strongly supercooled phase transitions |
in this paper, we provide updated constraints on the bolometric quasar luminosity function (qlf) from z = 0 to z = 7. the constraints are based on an observational compilation that includes observations in the rest-frame ir, b band, uv, soft, and hard x-ray in past decades. our method follows hopkins et al. with an upd... | the bolometric quasar luminosity function at z = 0-7 |
the hubble tension, if not caused by any systematics, could be relieved or even resolved from modifying either the early-time or late-time universe. the early-time modifications are usually in tension with either galaxy clustering or galaxy lensing constraints. the late-time modifications are also in conflict with the ... | no-go guide for the hubble tension: late-time solutions |
we investigate the potential for the lisa space-based interferometer to detect the stochastic gravitational wave background produced from different mechanisms during inflation. focusing on well-motivated scenarios, we study the resulting contributions from particle production during inflation, inflationary spectator fi... | science with the space-based interferometer lisa. iv: probing inflation with gravitational waves |
neutrinos, being the only fermions in the standard model of particle physics that do not possess electromagnetic or color charges, have the unique opportunity to communicate with fermions outside the standard model through mass mixing. such standard model-singlet fermions are generally referred to as "sterile neutrinos... | sterile neutrinos |
new early dark energy (nede) is a component of vacuum energy at the electron volt scale, which decays in a first-order phase transition shortly before recombination [f. niedermann and m. s. sloth, new early dark energy]. the nede component has the potential to resolve the tension between recent local measurements of th... | resolving the hubble tension with new early dark energy |
we review the formation and evaporation of primordial black holes (pbhs) and their possible contribution to dark matter. various constraints suggest they could only provide most of it in the mass windows $10^{17}$ - $10^{23}\,$g or $10$ - $10^{2}\,m_{\odot}$, with the last possibility perhaps being suggested by the lig... | primordial black holes as dark matter candidates |
we revisit the possibility that the stochastic common-spectrum process recently detected by the nanograv pulsar timing array experiment could be due to primordial gravitational waves (gws). a naïve extrapolation down to interferometer scales of the blue gw spectrum required to explain nanograv consistently with cosmic ... | primordial gravitational waves from nanograv: a broken power-law approach |
in the current 3nu paradigm, flavor oscillations probe 3 mixing angles (theta_12, theta_23, theta_13), one cp phase delta, and two squared mass differences delta m^2>0 and delta m^2, where sign(delta m^2)=+ (-) for normal (inverted) ordering. absolute nu masses can be probed by the effective m_beta in beta decay, by... | the unfinished fabric of the three neutrino paradigm |
a tantalizing hint of isotropic cosmic birefringence has been found in the e b cross-power spectrum of the cosmic microwave background (cmb) polarization data with a statistical significance of 3 σ . a pseudoscalar field coupled to the cmb photons via the chern-simons term can explain this observation. the same field m... | isotropic cosmic birefringence from early dark energy |
we present the muse hubble ultra deep survey, a mosaic of nine muse fields covering 90% of the entire hudf region with a 10-h deep exposure time, plus a deeper 31-h exposure in a single 1.15 arcmin2 field. the improved observing strategy and advanced data reduction results in datacubes with sub-arcsecond spatial resolu... | the muse hubble ultra deep field survey. i. survey description, data reduction, and source detection |
dark matter interacting via the exchange of a light pseudoscalar can induce observable signals in indirect detection experiments and experience large self-interactions while evading the strong bounds from direct dark matter searches. the pseudoscalar mediator will however induce flavour-changing interactions in the sta... | erratum: erratum to: a taste of dark matter: flavour constraints on pseudoscalar mediators |
we present uv luminosity functions of dropout galaxies at z∼ 6{--}10 with the complete hubble frontier fields data. we obtain a catalog of ∼450 dropout-galaxy candidates (350, 66, and 40 at z∼ 6{--}7, 8, and 9, respectively), with uv absolute magnitudes that reach ∼ -14 mag, ∼2 mag deeper than the hubble ultra deep fie... | full-data results of hubble frontier fields: uv luminosity functions at z ∼ 6-10 and a consistent picture of cosmic reionization |
luminous quasars at z> 5.6 can be studied in detail with the current generation of telescopes and provide us with unique information on the first gigayear of the universe. thus far, these studies have been statistically limited by the number of quasars known at these redshifts. such quasars are rare, and therefore, ... | the pan-starrs1 distant z > 5.6 quasar survey: more than 100 quasars within the first gyr of the universe |
galactic cosmic rays reach energies of at least a few petaelectronvolts (of the order of 1015 electronvolts). this implies that our galaxy contains petaelectronvolt accelerators (‘pevatrons’), but all proposed models of galactic cosmic-ray accelerators encounter difficulties at exactly these energies. dozens of galacti... | acceleration of petaelectronvolt protons in the galactic centre |
we present an analysis of type ia supernovae (sne~ia) from both the carnegie supernova project~i (csp-i) and ii (csp-ii), and extend the hubble diagram from the optical to the near-infrared wavelengths ($ubgvriyjh$). we calculate the hubble constant, $h_0$, using various distance calibrators: cepheids, tip of the red g... | carnegie supernova project-i and -ii: measurements of $h_0$ using cepheid, trgb, and sbf distance calibration to type ia supernovae |
motivated by the nanograv 15 year data and other recent investigations of stochastic gravitational background radiation based on pulsar timing arrays, we show how superheavy strings survive inflation but the slightly heavier monopoles do not in a non-supersymmetric hybrid inflation model based on flipped $su(5)$. with ... | inflation, superheavy metastable strings and gravitational waves in non-supersymmetric flipped su(5) |
we report the first direct detection of the cosmological power spectrum using the intensity signal from 21-cm emission of neutral hydrogen (hi), derived from interferometric observations with the l-band receivers of the new meerkat radio telescope. intensity mapping is a promising technique to map the three-dimensional... | a first detection of neutral hydrogen intensity mapping on mpc scales at $z\\approx 0.32$ and $z\\approx 0.44$ |
we present quantities which characterize the sensitivity of gravitational-wave observatories to sources at cosmological distances. in particular, we introduce and generalize the horizon, range, response, and reach distances. these quantities incorporate a number of important effects, including cosmologically well-defin... | distance measures in gravitational-wave astrophysics and cosmology |
the eighteenth data release (dr18) of the sloan digital sky survey (sdss) is the first one for sdss-v, the fifth generation of the survey. sdss-v comprises three primary scientific programs or "mappers": the milky way mapper (mwm), the black hole mapper (bhm), and the local volume mapper. this data release contains ext... | the eighteenth data release of the sloan digital sky surveys: targeting and first spectra from sdss-v |
the standard cosmological model determined from the accurate cosmic microwave background measurements made by the planck satellite implies a value of the hubble constant h0 that is 4.2 standard deviations lower than the one determined from type ia supernovae. the planck best fit model also predicts higher values of the... | relieving the hubble tension with primordial magnetic fields |
we propose a model of inflation capable of generating a population of light black holes (about 10-16- 10-14 solar masses) that might account for a significant fraction of the dark matter in the universe. the effective potential of the model features an approximate inflection point arising from two-loop order logarithmi... | primordial black hole dark matter from single field inflation |
we discuss the possibility of forming primordial black holes during a first-order phase transition in the early universe. as is well known, such a phase transition proceeds through the formation of true-vacuum bubbles in a universe that is still in a false vacuum. when there is a particle species whose mass increases s... | primordial black holes from first-order cosmological phase transitions |
we present the first joint analysis of gamma-ray data from the magic cherenkov telescopes and the fermi large area telescope (lat) to search for gamma-ray signals from dark matter annihilation in dwarf satellite galaxies. we combine 158 hours of segue 1 observations with magic with 6-year observations of 15 dwarf satel... | limits to dark matter annihilation cross-section from a combined analysis of magic and fermi-lat observations of dwarf satellite galaxies |
it is twenty years since the seminal works by magorrian and co-authors and by silk and rees, which, along with other related work, ignited an explosion of publications connecting active galactic nucleus (agn)-driven outflows to galaxy evolution. with a surge in observations of agn outflows, studies are attempting to te... | agn outflows and feedback twenty years on |
we study the gravothermal evolution of dark matter halos in the presence of dissipative dark matter self-interactions. dissipative interactions are present in many particle-physics realizations of the dark-sector paradigm and can significantly accelerate the gravothermal collapse of halos compared to purely elastic dar... | constraining dissipative dark matter self-interactions |
understanding the nature of quantum chromodynamics (qcd) matter is important but challenging due to the presence of non-perturbative dynamics under extreme conditions. we construct a holographic model describing the gluon sector of qcd at finite temperatures in the non-perturbative regime. the equation of state as a fu... | gravitational waves and primordial black hole productions from gluodynamics by holography |
cosmological simulations are an important theoretical pillar for understanding non-linear structure formation in our universe and for relating it to observations on large scales. in several papers, we introduce our millenniumtng (mtng) project that provides a comprehensive set of high-resolution, large-volume simulatio... | the millenniumtng project: the hydrodynamical full physics simulation and a first look at its galaxy clusters |
we show that a two-excitation process in superfluid helium, combined with sensitivity to mev energy depositions, can probe dark matter down to the ∼kev warm dark matter mass limit. this mass reach is 3 orders of magnitude below what can be probed with ordinary nuclear recoils in helium at the same energy resolution. fo... | detectability of light dark matter with superfluid helium |
the origins of lyman continuum (lyc) photons responsible for the reionization of the universe are as of yet unknown and highly contested. detecting lyc photons from the epoch of reionization is not possible due to absorption by the intergalactic medium, which has prompted the development of several indirect diagnostics... | the low-redshift lyman continuum survey. i. new, diverse local lyman continuum emitters |
the black hole binary (bhb) coalescence rates inferred from the advanced ligo detection of gw150914 imply an unexpectedly loud gravitational-wave (gw) sky at millihertz frequencies accessible to the evolved laser interferometer space antenna (elisa), with several outstanding consequences. first, up to thousands of bhbs... | prospects for multiband gravitational-wave astronomy after gw150914 |
identifying the astrophysical sources responsible for the high-energy cosmic neutrinos has been a longstanding challenge. in a previous work, we report evidence for a spatial correlation between blazars from the 5th roma-bzcat catalog and neutrino data of the highest detectable energies, i.e. >0.1 pev, collected by ... | extragalactic neutrino factories |
we present a sample-variance-limited measurement of the temperature power spectrum (t t ) of the cosmic microwave background using observations of a ∼1500 deg2 field made by the spt-3g in 2018. we report multifrequency power spectrum measurements at 95, 150, and 220 ghz covering the angular multipole range 750 ≤ℓ<30... | measurement of the cmb temperature power spectrum and constraints on cosmology from the spt-3g 2018 t t , t e , and e e dataset |
the axion emerges in extensions of the standard model that explain the absence of cp violation in the strong interactions. simultaneously, it can provide naturally the cold dark matter in our universe. several searches for axions and axion-like particles (alps) have constrained the corresponding parameter space over th... | a new experimental approach to probe qcd axion dark matter in the mass range above { 40} {μ }{ev} |
in this letter, combining peak theory and the numerical analysis of gravitational collapse in the radiation dominated era, we show that the abundance of primordial blacks holes, generated by an enhancement in the inflationary power spectrum, is extremely dependent on the shape of the peak. given the amplitude of the po... | abundance of primordial black holes depends on the shape of the inflationary power spectrum |
we describe blackhawk, a public c program for calculating the hawking evaporation spectra of any black hole distribution. this program enables the users to compute the primary and secondary spectra of stable or long-lived particles generated by hawking radiation of the distribution of black holes, and to study their ev... | blackhawk: a public code for calculating the hawking evaporation spectra of any black hole distribution |
we study the standard model (sm) in weyl conformal geometry. this embedding is truly minimal with no new fields beyond the sm spectrum and weyl geometry. the action inherits a gauged scale symmetry d(1) (known as weyl gauge symmetry) from the underlying geometry. the associated weyl quadratic gravity undergoes spontane... | standard model in weyl conformal geometry |
we study how the evaporation of primordial black holes (pbhs) can affect the production of dark matter (dm) particles through thermal processes. we consider fermionic dm interacting with standard model particles via a spin-1 mediator in the context of a freeze-out or freeze-in mechanism. we show that when pbhs evaporat... | primordial black hole evaporation and dark matter production. ii. interplay with the freeze-in or freeze-out mechanism |
the five-hundred-meter aperture spherical radio telescope (fast) has passed national acceptance and finished one pilot cycle of 'shared-risk' observations. it will start formal operation soon. in this context, this paper describes testing results of key fundamental parameters for fast, aiming to provide basic support f... | the fundamental performance of fast with 19-beam receiver at l band |
we investigate the anisotropic clustering of the baryon oscillation spectroscopic survey (boss) data release 12 sample, which consists of 1198 006 galaxies in the redshift range 0.2 < z < 0.75 and a sky coverage of 10 252 deg2. we analyse this data set in fourier space, using the power-spectrum multipoles to meas... | the clustering of galaxies in the completed sdss-iii baryon oscillation spectroscopic survey: anisotropic galaxy clustering in fourier space |
the f(q) theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time universe. we use the big bang nucleosynthesis (bbn) formalism and observations in order to extract constraints on various classes of ... | new models and big bang nucleosynthesis constraints in f(q) gravity |
quantum consistency suggests that any de sitter patch that lasts a number of hubble times that exceeds its gibbons-hawking entropy divided by the number of light particle species suffers an effect of quantum breaking. inclusion of other interactions makes the quantum break-time shorter. the requirement that this must n... | quantum breaking bound on de sitter and swampland |
motivated by the large observed diversity in the properties of extragalactic extinction by dust, we reanalyze the cepheid calibration used to infer the hubble constant, h 0, from type ia supernovae, using cepheid data in 19 type ia supernova host galaxies from riess et al. and anchor data from riess et al. unlike the s... | sensitivity of the hubble constant determination to cepheid calibration |
a search for narrow vector resonances decaying into quark-antiquark pairs is presented. the analysis is based on data collected in proton-proton collisions at √{s}=13 tev with the cms detector at the lhc, corresponding to an integrated luminosity of 35.9 fb-1. the hypothetical resonance is produced with sufficiently hi... | search for low mass vector resonances decaying into quark-antiquark pairs in proton-proton collisions at √{s}=13 tev |
type ia supernovae, calibrated by classical distance ladder methods, can be used, in conjunction with galaxy survey two-point correlation functions, to empirically determine the size of the sound horizon r s. assumption of the λcdm model, together with data to constrain its parameters, can also be used to determine the... | sounds discordant: classical distance ladder and λcdm-based determinations of the cosmological sound horizon |
in anticipation of upcoming gravitational wave experiments, we provide a comprehensive overview of the spectra predicted by phase transitions triggered by states from a large variety of dark sector models. such spectra are functions of the quantum numbers and (self-) couplings of the scalar that triggers the dark phase... | model discrimination in gravitational wave spectra from dark phase transitions |
we evaluate the effectiveness of early dark energy (ede) in addressing the hubble tension using data from the completed eboss survey, focusing on luminous red galaxies (lrgs), quasars (qsos), and emission line galaxies (elgs). we perform cosmological parameter measurements based on full shape analysis of the power spec... | cosmological constraints on early dark energy from the full shape analysis of eboss dr16 |
for a cosmological first-order phase transition in the early universe, the associated stochastic gravitational wave background is usually dominated by sound waves from plasma fluid motions, which have been analytically modeled as a random superposition of freely propagating sound shells but with the force by the scalar... | hydrodynamic sound shell model |
tidal disruption events (tdes) offer a unique way to study dormant black holes. while the number of observed tdes has grown thanks to the emergence of wide-field surveys in the past few decades, questions regarding the nature of the observed optical, uv, and x-ray emission remain. we present a uniformly selected sample... | the final season reimagined: 30 tidal disruption events from the ztf-i survey |
gravitational interferometers and cosmological observations of the cosmic microwave background offer us the prospect to probe the laws of gravity in the primordial universe. to study and interpret these datasets we need to know the possible graviton non-gaussianities. to this end, we derive the most general tree-level ... | bootstrapping large graviton non-gaussianities |
we study axion-photon couplings in compactifications of type iib string theory. we find that these couplings are systematically suppressed compared to the inverse axion periodicity, as a result of two effects. first, couplings to the qed theta angle are suppressed for axion mass eigenstates that are light compared to t... | glimmers from the axiverse |
single-field models of inflation might lead to amplified scalar fluctuations on small scales due, for example, to a transient ultra-slow-roll phase. it was argued by kristiano $\&$ yokoyama in arxiv:2211.03395 that the enhanced amplitude of the scalar power spectrum on small scales has the potential to induce a siz... | numerical 1-loop correction from a potential yielding ultra-slow-roll dynamics |
we report a novel prediction from single-field inflation that even a tiny step in the inflaton potential can change our perception of primordial non-gaussianities of the curvature perturbation. our analysis focuses on the tail of probability distribution generated by an upward step transition between two stages of slow... | one small step for an inflaton, one giant leap for inflation: a novel non-gaussian tail and primordial black holes |
we present nbodykit, an open-source, massively parallel python toolkit for analyzing large-scale structure (lss) data. using python bindings of the message passing interface, we provide parallel implementations of many commonly used algorithms in lss. nbodykit is both an interactive and scalable piece of scientific sof... | nbodykit: an open-source, massively parallel toolkit for large-scale structure |
we present the npipe processing pipeline, which produces calibrated frequency maps in temperature and polarization from data from the planck low frequency instrument (lfi) and high frequency instrument (hfi) using high-performance computers. npipe represents a natural evolution of previous planck analysis efforts, and ... | planck intermediate results. lvii. joint planck lfi and hfi data processing |
ultralight axions (ulas) with masses in the range 1 0-33 ev ≤ma≤1 0-20 ev are motivated by string theory and might contribute to either the dark-matter or dark-energy densities of the universe. ulas could suppress the growth of structure on small scales, lead to an altered integrated sachs-wolfe effect on cosmic microw... | a search for ultralight axions using precision cosmological data |
we measure and analyse the bispectrum of the final data release 12 (dr12), galaxy sample provided by the baryon oscillation spectroscopic survey, splitting by selection algorithm into lowz and cmass galaxies. the lowz sample contains 361 762 galaxies with an effective redshift of zlowz = 0.32, and the cmass sample cont... | the clustering of galaxies in the sdss-iii baryon oscillation spectroscopic survey: rsd measurement from the power spectrum and bispectrum of the dr12 boss galaxies |
we examine the circular velocity profiles of galaxies in λ cold dark matter (cdm) cosmological hydrodynamical simulations from the eagle and local groups projects and compare them with a compilation of observed rotation curves of galaxies spanning a wide range in mass. the shape of the circular velocity profiles of sim... | the unexpected diversity of dwarf galaxy rotation curves |
new light, weakly-coupled particles are commonly invoked to address the persistent ∼ 4 σ anomaly in ( g-2) μand serve as mediators between dark and visible matter. if such particles couple predominantly to heavier generations and decay invisibly, much of their best-motivated parameter space is inaccessible with existin... | m3: a new muon missing momentum experiment to probe ( g - 2) μand dark matter at fermilab |
we discuss quantum gravitational effects in einstein theory coupled to periodic axion scalars to analyze the viability of several proposals to achieve superplanckian axion periods (aka decay constants) and their possible application to large field inflation models. the effects we study correspond to the nucleation of e... | transplanckian axions!? |
we present a morphological catalogue for ∼670 000 galaxies in the sloan digital sky survey in two flavours: t-type, related to the hubble sequence, and galaxy zoo 2 (gz2 hereafter) classification scheme. by combining accurate existing visual classification catalogues with machine learning, we provide the largest and mo... | improving galaxy morphologies for sdss with deep learning |
we present global analyses of effective higgs portal dark matter models in the frequentist and bayesian statistical frameworks. complementing earlier studies of the scalar higgs portal, we use gambit to determine the preferred mass and coupling ranges for models with vector, majorana and dirac fermion dark matter. we a... | global analyses of higgs portal singlet dark matter models using gambit |
light dark sectors in thermal contact with the standard model naturally produce the observed relic dark matter abundance and are the targets of a broad experimental search program. a key light dark sector model is the pseudo-dirac fermion with a dark photon mediator. the dynamics of the fermionic excited states are oft... | electromagnetic signals of inelastic dark matter scattering |
primordial black holes (pbhs) are supposed to form from the collapse of over-densed regions generated by large scalar curvature perturbations in the radiation dominated era. despite decades of various independent observations, the nature of dark matter (dm) remains highly puzzling. recently, pbh dm have aroused interes... | a topic review on probing primordial black hole dark matter with scalar induced gravitational waves |
the ligo detection of the gravitational wave transient gw150914, from the inspiral and merger of two black holes with masses ≳30 m⊙, suggests a population of binary black holes with relatively high mass. this observation implies that the stochastic gravitational-wave background from binary black holes, created from the... | gw150914: implications for the stochastic gravitational-wave background from binary black holes |
we present a search for extragalactic fast blue optical transients (fbots) during phase i of the zwicky transient facility (ztf). we identify 38 candidates with durations above half-maximum light 1 day < t 1/2 < 12 days, of which 28 have blue (g - r ≲ -0.2 mag) colors at peak light. of the 38 transients (28 fbots... | a search for extragalactic fast blue optical transients in ztf and the rate of at2018cow-like transients |
dark matter is one of the greatest mysteries in physics. it interacts via gravity and composes most of our universe, but its elementary composition is unknown. we search for nongravitational interactions of axion-like dark matter with atomic spins using a precision quantum detector. the detector is composed of spin-pol... | new constraints on axion-like dark matter using a floquet quantum detector |
we extend the calculation of dark matter direct detection rates via electronic transitions in general dielectric crystal targets, combining state-of-the-art density functional theory calculations of electronic band structures and wave functions near the band gap, with semianalytic approximations to include additional s... | extended calculation of dark matter-electron scattering in crystal targets |
spurred by rich, multiwavelength observations and enabled by new simulations, ranging from cosmological to subparsec scales, the past decade has seen major theoretical progress in our understanding of the circumgalactic medium (cgm). we review key physical processes in the cgm. our conclusions include the following: &l... | key physical processes in the circumgalactic medium |
a number of anomalous results in short-baseline oscillation may hint at the existence of one or more light sterile neutrino states in the ev mass range and have triggered a wave of new experimental efforts to search for a definite signature of oscillations between active and sterile neutrino states. the present paper a... | status of light sterile neutrino searches |
we describe the design, manufacture, and performance of bare-fiber integral field units (ifus) for the sdss-iv survey mapping nearby galaxies at apache point observatory (manga) on the the sloan 2.5 m telescope at apache point observatory. manga is a luminosity-selected integral-field spectroscopic survey of 104 local ... | the manga integral field unit fiber feed system for the sloan 2.5 m telescope |
hawking evaporation of primordial black holes (pbhs) can facilitate the generation of matter-antimatter asymmetry. we focus on ultra-low mass pbhs that briefly dominate the universe and evaporate before the big bang nucleosynthesis. we propose a novel test of this scenario by detecting its characteristic doubly peaked ... | doubly peaked induced stochastic gravitational wave background: testing baryogenesis from primordial black holes |
we study the properties of the stochastic gravitational wave background (sgwb) produced by domain walls (dws) during inflation without forming a network. we numerically simulate the dw production caused by a second-order phase transition and calculate the sgwb spectrum using a $1000\times1000\times1000$ lattice. we sho... | gravitational waves produced by domain walls during inflation |
we compile a complete collection of reliable hubble parameter h(z) data to redshift z ≤ 2.36 and use them with the gaussian process method to determine continuous h(z) functions for various data subsets. from these continuous h(z)'s, summarizing across the data subsets considered, we find h 0 ∼ 67 ± 4 km s-1 mpc-1, mor... | hubble parameter and baryon acoustic oscillation measurement constraints on the hubble constant, the deviation from the spatially flat λcdm model, the deceleration-acceleration transition redshift, and spatial curvature |
cosmological phase transitions proceed via the nucleation of bubbles that subsequently expand and collide. the resulting gravitational wave spectrum depends crucially on the bubble wall velocity. we use holography to compute the wall velocity from first principles in a strongly coupled, non-abelian, four-dimensional ga... | bubble wall velocity from holography |
scattering of light dark matter with sub-ev energy deposition can be detected with collective excitations in condensed matter systems. when dark matter has spin-independent couplings to atoms or ions, it has been shown to efficiently excite phonons. here we show that, if dark matter couples to the electron spin, magnon... | detecting light dark matter with magnons |
gas falling into a black hole (bh) from large distances is unaware of bh spin direction, and misalignment between the accretion disc and bh spin is expected to be common. however, the physics of tilted discs (e.g. angular momentum transport and jet formation) is poorly understood. using our new gpu-accelerated code h-a... | formation of precessing jets by tilted black hole discs in 3d general relativistic mhd simulations |
accurately predicting the demographics of dark matter (dm) substructure is of paramount importance for many fields of astrophysics, including gravitational lensing, galaxy evolution, halo occupation modelling, and constraining the nature of dm. because of its strongly non-linear nature, dm substructure is typically mod... | disruption of dark matter substructure: fact or fiction? |
new constraints are presented on the spin-dependent weakly-interacting-massive-particle- (wimp-)nucleon interaction from the pandax-ii experiment, using a data set corresponding to a total exposure of 3.3 ×104 kg day . assuming a standard axial-vector spin-dependent wimp interaction with <mml:mmultiscripts>xe 129... | spin-dependent weakly-interacting-massive-particle-nucleon cross section limits from first data of pandax-ii experiment |
within classically conformal models, the spontaneous breaking of scale invariance is usually associated to a strong first order phase transition that results in a gravitational wave background within the reach of future space-based interferometers. in this paper we study the case of the classically conformal gauged b-l... | phase transition and vacuum stability in the classically conformal b-l model |
the renormalization of the vacuum energy in quantum field theory (qft) is usually plagued with theoretical conundrums related not only with the renormalization procedure itself, but also with the fact that the final result leads usually to very large (finite) contributions incompatible with the measured value of λ in c... | renormalizing the vacuum energy in cosmological spacetime: implications for the cosmological constant problem |
precise measurements of the cosmic microwave background (cmb) power spectrum are in excellent agreement with the predictions of the standard λ cdm cosmological model. however, there is some tension between the value of the hubble parameter h0 inferred from the cmb and that inferred from observations of the universe at ... | dark energy at early times, the hubble parameter, and the string axiverse |
we study a coupled quintessence model with pure momentum exchange and present the effects of such an interaction on the cosmic microwave background (cmb) and matter power spectrum. for a wide range of negative values of the coupling parameter β structure growth is suppressed and the model can reconcile the tension betw... | reconciling cmb and structure growth measurements with dark energy interactions |
inflation correlators with one-loop massive exchange encode rich information about the dynamics of the massive loop particles. their nonanalytic behavior in certain soft limits leads to characteristic oscillatory pattern, which is the leading signal of many particle models of cosmological collider physics. in this work... | inflation correlators at the one-loop order: nonanalyticity, factorization, cutting rule, and ope |
a rather minimal possibility is that dark matter consists of the gauge bosons of a spontaneously broken symmetry. here we explore the possibility of detecting the gravitational waves produced by the phase transition associated with such breaking. concretely, we focus on the scenario based on an su(2) dgroup and argue t... | strong gravitational radiation from a simple dark matter model |
the ligo and virgo interferometers have so far provided 11 gravitational-wave (gw) observations of black-hole binaries. similar detections are bound to become very frequent in the near future. with the current and upcoming wealth of data, it is possible to confront specific formation models with observations. we invest... | primordial black holes confront ligo/virgo data: current situation |
aims: the erosita final equatorial-depth survey has been carried out during the performance verification phase of the spectrum-roentgen-gamma/erosita telescope and was completed in november 2019. this survey is designed to provide the first erosita-selected sample of clusters and groups and to test the predictions for ... | the erosita final equatorial-depth survey (efeds). catalog of galaxy clusters and groups |
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