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we study ultra-diffuse galaxies (udgs) in zoom in cosmological simulations, seeking the origin of udgs in the field versus galaxy groups. we find that while field udgs arise from dwarfs in a characteristic mass range by multiple episodes of supernova feedback (di cintio et al.), group udgs may also form by tidal puffin... | formation of ultra-diffuse galaxies in the field and in galaxy groups |
black holes formed in dense star clusters, where dynamical interactions are frequent, may have fundamentally different properties than those formed through isolated stellar evolution. theoretical models for single-star evolution predict a gap in the black hole mass spectrum from roughly 40-120 m⊙ caused by (pulsational... | intermediate-mass black holes from high massive-star binary fractions in young star clusters |
a spectral-energy distribution (sed) model for type ia supernovae (sne ia) is a critical tool for measuring precise and accurate distances across a large redshift range and constraining cosmological parameters. we present an improved model framework, salt3, which has several advantages over current models-including the... | salt3: an improved type ia supernova model for measuring cosmic distances |
inspired by the recent conjecture originated from graduated dark energy that the universe has recently transitioned from anti-de sitter vacua to de sitter vacua, we extend the standard λ cdm model by a cosmological constant (λs ) that switches sign at a certain redshift z†, and we call this model λscdm . we discuss the... | relaxing cosmological tensions with a sign switching cosmological constant |
stripped-envelope (se) supernovae (sne) include h-poor (type iib), h-free (type ib), and he-free (type ic) events thought to be associated with the deaths of massive stars. the exact nature of their progenitors is a matter of debate with several lines of evidence pointing towards intermediate mass (minit< 20 m⊙) sta... | the carnegie supernova project i. analysis of stripped-envelope supernova light curves |
estimates of the hubble constant, h0, from the local distance ladder and from the cosmic microwave background (cmb) are discrepant at the ∼3σ level, indicating a potential issue with the standard λ cold dark matter (λcdm) cosmology. a probabilistic (i.e. bayesian) interpretation of this tension requires a model compari... | clarifying the hubble constant tension with a bayesian hierarchical model of the local distance ladder |
a lingering mystery in core-collapse supernova theory is how collective neutrino oscillations affect the dynamics. all previously identified flavor instabilities, some of which might make the effects considerable, are essentially collisionless phenomena. here it is shown that collisional instabilities exist as well. th... | collisional flavor instabilities of supernova neutrinos |
the measurements of cosmic microwave background (cmb) anisotropies made by the planck satellite provide extremely tight upper bounds on the total neutrino mass scale (σmν< 0.26 ev at 95% c.l.). however, as recently discussed in the literature, the planck data show anomalies that could affect this result. here we pro... | neutrino mass bounds in the era of tension cosmology |
we explore the use of the mass spectrum of neutron stars and black holes in gravitational-wave compact binary sources as a cosmological probe. these standard siren sources provide direct measurements of luminosity distance. in addition, features in the mass distribution, such as mass gaps or peaks, will redshift and th... | spectral sirens: cosmology from the full mass distribution of compact binaries |
gamma-ray bursts (grbs) are classified into long and short events. long grbs (lgrbs) are associated with the end states of very massive stars, while short grbs (sgrbs) are linked to the merger of compact objects. grb 200826a was a peculiar event, because by definition it was an sgrb, with a rest-frame duration of ~0.5 ... | the peculiar short-duration grb 200826a and its supernova |
white dwarfs represent the last stage of evolution of stars with mass less than about eight times that of the sun and, like other stars, are often found in binaries1,2. if the orbital period of the binary is short enough, energy losses from gravitational-wave radiation can shrink the orbit until the two white dwarfs co... | a highly magnetized and rapidly rotating white dwarf as small as the moon |
we perform a comprehensive search for optical precursor emission at the position of sn 2023ixf using data from the dlt40, ztf, and atlas surveys. by comparing the current data set with precursor outburst hydrodynamical model light curves, we find that the probability of a significant outburst within 5 yr of explosion i... | a comprehensive optical search for pre-explosion outbursts from the quiescent progenitor of sn 2023ixf |
the fast flavor conversions (ffcs) of neutrinos generally exist in core-collapse supernovae and binary neutron-star merger remnants and can significantly change the flavor composition and affect the dynamics and nucleosynthesis processes. several analytical prescriptions were proposed recently to approximately explain ... | evaluating approximate asymptotic distributions for fast neutrino flavor conversions in a periodic 1d box |
massive binaries that merge as compact objects are the progenitors of gravitational-wave sources. most of these binaries experience one or more phases of mass transfer, during which one of the stars loses all or part of its outer envelope and becomes a stripped-envelope star. the evolution of the size of these stripped... | the expansion of stripped-envelope stars: consequences for supernovae and gravitational-wave progenitors |
in our quest to identify the progenitors of type ia supernovae (sne ia), we first update the nucleosynthesis yields for both near-chandrasekhar- (ch) and sub-ch-mass white dwarfs (wds) for a wide range of metallicities with our 2d hydrodynamical code and the latest nuclear reaction rates. we then include the yields in ... | new type ia supernova yields and the manganese and nickel problems in the milky way and dwarf spheroidal galaxies |
the most common way to discover extragalactic fast transients, which fade within a few nights in the optical, is via follow-up of gamma-ray burst and gravitational-wave triggers. however, wide-field surveys have the potential to identify rapidly fading transients independently of such external triggers. the volumetric ... | fast-transient searches in real time with ztfrest: identification of three optically discovered gamma-ray burst afterglows and new constraints on the kilonova rate |
with the recent increase in precision of our cosmological datasets, measurements of λcdm model parameter provided by high- and low-redshift observations started to be in tension, i.e., the obtained values of such parameters were shown to be significantly different in a statistical sense. in this work we tackle the tens... | cmb tensions with low-redshift h0 and s8 measurements: impact of a redshift-dependent type-ia supernovae intrinsic luminosity |
we present a hydrodynamical simulation of the turbulent, magnetized, supernova (sn)-driven interstellar medium (ism) in a stratified box that dynamically couples the injection and evolution of cosmic rays (crs) and a self-consistent evolution of the chemical composition. crs are treated as a relativistic fluid in the a... | launching cosmic-ray-driven outflows from the magnetized interstellar medium |
galactic outflows play an important role in galactic evolution. despite their importance, a detailed understanding of the physical mechanisms responsible for the driving of these winds is lacking. in an effort to gain more insight into the nature of these flows, we perform global three-dimensional magnetohydrodynamical... | global simulations of galactic winds including cosmic-ray streaming |
the next core-collapse supernova in the milky way or its satellites will represent a once-in-a-generation opportunity to obtain detailed information about the explosion of a star and provide significant scientific insight for a variety of fields because of the extreme conditions found within. supernovae in our galaxy a... | snews 2.0: a next-generation supernova early warning system for multi-messenger astronomy |
reionization in the early universe is likely driven by dwarf galaxies. using cosmological radiation-hydrodynamic simulations, we study star formation and the escape of lyman continuum (lyc) photons from mini-haloes with {m_halo}≲ 10^8 {m_{⊙}}. our simulations include a new thermo-turbulent star formation model, non-equ... | feedback-regulated star formation and escape of lyc photons from mini-haloes during reionization |
the silcc project (simulating the life-cycle of molecular clouds) aims at a more self-consistent understanding of the interstellar medium (ism) on small scales and its link to galaxy evolution. we present three-dimensional (magneto)hydrodynamic simulations of the ism in a vertically stratified box including self-gravit... | the silcc (simulating the lifecycle of molecular clouds) project - ii. dynamical evolution of the supernova-driven ism and the launching of outflows |
we consider generic neutrino dipole portals between left-handed neutrinos, photons, and right-handed heavy neutral leptons (hnl) with dirac masses. the dominance of this portal significantly alters the conventional phenomenology of hnls. we derive a comprehensive set of constraints on the dipole portal to hnls by utili... | dipole portal to heavy neutral leptons |
even if the fundamental action of gravity is local, the corresponding quantum effective action, that includes the effect of quantum fluctuations, is a nonlocal object. these nonlocalities are well understood in the ultraviolet regime but much less in the infrared, where they could in principle give rise to important co... | nonlocal gravity. conceptual aspects and cosmological predictions |
as one of the closest supernovae (sne) in the last decade, sn 2023ixf is an unprecedented target to investigate the progenitor star that exploded. however, there is still significant uncertainty in the reported progenitor properties. in this work, we present a detailed study of sn 2023ixf's progenitor with two independ... | the dusty red supergiant progenitor and the local environment of the type ii sn 2023ixf in m101 |
up-to-date cosmological data analyses have shown that (a) a closed universe is preferred by the planck data at more than 99% cl, and (b) interacting scenarios offer a very compelling solution to the hubble constant tension. in light of these two recent appealing scenarios, we consider here an interacting dark matter-da... | 2021-h0 odyssey: closed, phantom and interacting dark energy cosmologies |
energy-transport effects can alter the structure that develops as a supernova evolves into a supernova remnant. the rayleigh-taylor instability is thought to produce structure at the interface between the stellar ejecta and the circumstellar matter, based on simple models and hydrodynamic simulations. here we report ex... | how high energy fluxes may affect rayleigh-taylor instability growth in young supernova remnants |
group-iv monochalcogenides are a family of two-dimensional puckered materials with an orthorhombic structure that is comprised of polar layers. in this article, we use first principles calculations to show the multistability of monolayer sns and gese, two prototype materials where the direction of the puckering can be ... | polarization and valley switching in monolayer group-iv monochalcogenides |
large dust reservoirs (up to approximately 108 m⊙) have been detected1-3 in galaxies out to redshift z ≃ 8, when the age of the universe was only about 600 myr. generating substantial amounts of dust within such a short timescale has proven challenging for theories of dust formation4,5 and has prompted the revision of ... | carbonaceous dust grains seen in the first billion years of cosmic time |
object grb 221009a is the brightest gamma-ray burst (grb) detected in more than 50 yr of study. in this paper, we present observations in the x-ray and optical domains obtained by the grandma collaboration and the insight collaboration. we study the optical afterglow with empirical fitting using the grandma+hxmt-le dat... | grandma and hxmt observations of grb 221009a: the standard luminosity afterglow of a hyperluminous gamma-ray burst-in gedenken an david alexander kann |
blue supergiant stars develop into core-collapse supernovae—one of the most energetic outbursts in the universe—when all nuclear burning fuel is exhausted in the stellar core. previous attempts have failed to explain observed explosions of such stars, which have a zero-age main-sequence mass of 50 m⊙ or more. here, we ... | quark deconfinement as a supernova explosion engine for massive blue supergiant stars |
motivated by an updated compilation of observational hubble data (ohd) that consist of 51 points in the redshift range of 0.07 < z < 2.36, we study an interesting model known as cardassian that drives the late cosmic acceleration without a dark energy component. our compilation contains 31 data points measured wi... | the cardassian expansion revisited: constraints from updated hubble parameter measurements and type ia supernova data |
the third observing run by lvc has brought the discovery of many compact binary coalescences. following the detection of the first binary neutron star merger in this run (ligo/virgo s190425z), we performed a dedicated follow-up campaign with the zwicky transient facility (ztf) and palomar gattini-ir telescopes. the ini... | growth on s190425z: searching thousands of square degrees to identify an optical or infrared counterpart to a binary neutron star merger with the zwicky transient facility and palomar gattini-ir |
the phenomenological parametrizations of dark-energy (de) equations of state can be very helpful, since they allow for the investigation of its cosmological behavior despite the fact that its underlying theory is unknown. however, although there has been a large amount of research on de parametrizations which involve t... | observational constraints on one-parameter dynamical dark-energy parametrizations and the h0 tension |
in a recent paper, we investigated possible systematic uncertainties related to the cepheid color-luminosity calibration method and their influence on the tension between the hubble constant as inferred from distances to type ia supernovae and the cosmic microwave background as measured with the planck satellite. here,... | the hubble tension revisited: additional local distance ladder uncertainties |
we investigate the light-curve properties of a sample of 26 spectroscopically confirmed hydrogen-poor superluminous supernovae (slsne-i) in the palomar transient factory survey. these events are brighter than sne ib/c and sne ic-bl, on average, by about 4 and 2 mag, respectively. the peak absolute magnitudes of slsne-i... | light curves of hydrogen-poor superluminous supernovae from the palomar transient factory |
if the neutrino luminosity from the proto-neutron star formed during a massive star core collapse exceeds a critical threshold, a supernova (sn) results. using spherical quasi-static evolutionary sequences for hundreds of progenitors over a range of metallicities, we study how the explosion threshold maps onto observab... | the landscape of the neutrino mechanism of core-collapse supernovae: neutron star and black hole mass functions, explosion energies, and nickel yields |
we explore the cosmological implications of anisotropic clustering measurements in configuration space of the final galaxy samples from data release 12 of the sloan digital sky survey iii baryon oscillation spectroscopic survey. we implement a new detailed modelling of the effects of non-linearities, bias and redshift-... | the clustering of galaxies in the completed sdss-iii baryon oscillation spectroscopic survey: cosmological implications of the configuration-space clustering wedges |
in core-collapse supernovae or compact binary merger remnants, neutrino-neutrino refraction can spawn fast pair conversion of the type νeν¯ e↔νxν¯ x (with x =μ , τ ), governed by the angle-dependent density matrices of flavor lepton number. in a homogeneous and axially symmetric two-flavor system, all angle modes evolv... | neutrino flavor pendulum reloaded: the case of fast pairwise conversion |
we present a new constraint on the hubble constant h 0 using a sample of well-localized gravitational-wave (gw) events detected during the first three ligo/virgo observing runs as dark standard sirens. in the case of dark standard sirens, a unique host galaxy is not identified, and the redshift information comes from t... | a standard siren measurement of the hubble constant using gravitational-wave events from the first three ligo/virgo observing runs and the desi legacy survey |
galaxy-cluster gravitational lenses can magnify background galaxies by a total factor of up to 50. here we report an image of an individual star at redshift z = 1.49 (dubbed macs j1149 lensed star 1) magnified by more than ×2,000. a separate image, detected briefly 0.26″ from lensed star 1, is probably a counterimage o... | extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens |
we present three-dimensional hydrodynamic simulations of the evolution of core-collapse supernovae (sn) from blast-wave initiation by the neutrino-driven mechanism to shock breakout from the stellar surface, using an axis-free yin-yang grid and considering two 15 m⊙ red supergiants (rsg) and two blue supergiants (bsg) ... | three-dimensional simulations of core-collapse supernovae: from shock revival to shock breakout |
we present the first successful simulation of a neutrino-driven supernova explosion in three dimensions (3d), using the prometheus-vertex code with an axis-free yin-yang grid and a sophisticated treatment of three-flavor, energy-dependent neutrino transport. the progenitor is a nonrotating, zero-metallicity 9.6 {{m}⊙ }... | neutrino-driven supernova of a low-mass iron-core progenitor boosted by three-dimensional turbulent convection |
one of the most exciting and pressing issues in cosmology today is the discrepancy between some measurements of the local hubble constant and other values of the expansion rate inferred from the observed temperature and polarization fluctuations in the cosmic microwave background (cmb) radiation. resolving these differ... | progress in direct measurements of the hubble constant |
a dark photon is a well-motivated new particle which, as a component of an associated dark sector, could explain dark matter. one strong limit on dark photons arises from excessive cooling of supernovae. we point out that even at couplings where too few dark photons are produced in supernovae to violate the cooling bou... | observable signatures of dark photons from supernovae |
the combination of baryonic acoustic oscillation (bao) data together with light element abundance measurements from big bang nucleosynthesis (bbn) has been shown to constrain the cosmological expansion history to an unprecedented degree. using the newest luna data and dr16 data from sdss, the bao+bbn probe puts tight c... | bao+bbn revisited - growing the hubble tension with a 0.7 km/s/mpc constraint |
in this white paper, we outline some of the scientific opportunities and challenges related to detection and reconstruction of low-energy (less than 100 mev) signatures in liquid argon time-projection chamber (lartpc) detectors. key takeaways are summarized as follows. 1) lartpcs have unique sensitivity to a range of p... | low-energy physics in neutrino lartpcs |
we present four ab initio axisymmetric core-collapse supernova simulations initiated from 12, 15, 20, and 25 {m}⊙zero-age main sequence progenitors. all of the simulations yield explosions and have been evolved for at least 1.2 s after core bounce and 1 s after material first becomes unbound. these simulations were com... | the development of explosions in axisymmetric ab initio core-collapse supernova simulations of 12-25 m stars |
we develop a new phenomenological model that addresses current tensions between observations of the early and late universe. our scenario features: (i) a decaying dark energy fluid (dde) with a transition at z ∼5 ,000 , to raise today's value of the hubble parameter, and (ii) an ultralight axion (ula), which starts osc... | dark sector to restore cosmological concordance |
we present a suite of 3d multiphysics mhd simulations following star formation in isolated turbulent molecular gas discs ranging from 5 to 500 parsecs in radius. these simulations are designed to survey the range of surface densities between those typical of milky way giant molecular clouds (gmcs) ({∼ } 10^2 {m_{\odot ... | when feedback fails: the scaling and saturation of star formation efficiency |
it has been speculated for a long time that neutrinos from a supernova (sn) may undergo fast flavor conversions near the collapsed stellar core. we perform a detailed study of this intriguing possibility, for the first time analyzing two time-dependent state-of-the-art three-dimensional (3d) sn models of 9 m⊙ and 20 m⊙... | fast neutrino flavor instability in the neutron-star convection layer of three-dimensional supernova models |
collective pair conversion νeν¯ e↔νxν¯ x by forward scattering, where x =μ or τ , may be generic for supernova neutrino transport. depending on the local angular intensity of the electron lepton number carried by neutrinos, the conversion rate can be "fast," i.e., of the order of √{2 }gf(nνe-nν¯e)≫δ matm2/2 e . we pres... | fast pairwise conversion of supernova neutrinos: a dispersion relation approach |
turbulence is ubiquitous in molecular clouds (mcs), but its origin is still unclear because mcs are usually assumed to live longer than the turbulence dissipation time. interstellar medium (ism) turbulence is likely driven by supernova (sn) explosions, but it has never been demonstrated that sn explosions can establish... | supernova driving. i. the origin of molecular cloud turbulence |
the question of what ingredients characterize the quasisteady state of fast neutrino-flavor conversion (ffc) is one of the longstanding riddles in neutrino oscillation. addressing this issue is necessary for accurate modeling of neutrino transport in core-collapse supernova and binary neutron star merger. recent numeri... | characterizing quasisteady states of fast neutrino-flavor conversion by stability and conservation laws |
in this work, we study a cosmological model of bianchi type-i universe in teleparallel gravity for a perfect fluid. to obtain the cosmological solution of the model, we assume that the deceleration parameter (dp) is a linear function of the hubble parameter h i.e. q = -1 + βh (where β as a positive constant). consequen... | stability analysis of anisotropic bianchi type-i cosmological model in teleparallel gravity |
we present updated constraints on the variation of the fine structure constant, αem, and effective electron rest mass, me, during the cosmological recombination era. these two fundamental constants directly affect the ionization history at redshift z ≃ 1100 and, thus, modify the temperature and polarization anisotropie... | updated fundamental constant constraints from planck 2018 data and possible relations to the hubble tension |
the study of stellar-remnant black holes (bh) in dense stellar clusters is now in the spotlight, especially due to their intrinsic ability to form binary black holes (bbh) through dynamical encounters, which potentially coalesce via gravitational-wave (gw) radiation. in this work, which is a continuation from a recent ... | stellar-mass black holes in young massive and open stellar clusters and their role in gravitational-wave generation - ii |
previously we used the nearby supernova factory sample to show that type ia supernovae (sne ia) having locally star-forming environments are dimmer than sne ia having locally passive environments. here we use the constitution sample together with host galaxy data from galex to independently confirm that result. the eff... | confirmation of a star formation bias in type ia supernova distances and its effect on the measurement of the hubble constant |
we report the discovery of asassn-15lh (sn 2015l), which we interpret as the most luminous supernova yet found. at redshift z = 0.2326, asassn-15lh reached an absolute magnitude of mu,ab = -23.5 ± 0.1 and bolometric luminosity lbol = (2.2 ± 0.2) × 1045 ergs s-1, which is more than twice as luminous as any previously kn... | asassn-15lh: a highly super-luminous supernova |
time-domain science has undergone a revolution over the past decade, with tens of thousands of new supernovae (sne) discovered each year. however, several observational domains, including sne within days or hours of explosion and faint, red transients, are just beginning to be explored. here we present the young supern... | the young supernova experiment: survey goals, overview, and operations |
large-scale outflows in star-forming galaxies are observed to be ubiquitous and are a key aspect of theoretical modeling of galactic evolution, the focus of the simulating multiscale astrophysics to understand galaxies (smaug) project. gas blown out from galactic disks, similar to gas within galaxies, consists of multi... | first results from smaug: characterization of multiphase galactic outflows from a suite of local star-forming galactic disk simulations |
separating the components of redshift due to expansion and peculiar motion in the nearby universe (z < 0.1) is critical for using type ia supernovae (sne ia) to measure the hubble constant (h 0) and the equation-of-state parameter of dark energy (w). here, we study the two dominant "motions" contributing to nearby p... | the pantheon+ analysis: evaluating peculiar velocity corrections in cosmological analyses with nearby type ia supernovae |
muons can be created in nascent neutron stars (nss) due to the high electron chemical potentials and the high temperatures. because of their relatively lower abundance compared to electrons, their role has so far been ignored in numerical simulations of stellar core collapse and ns formation. however, the appearance of... | muon creation in supernova matter facilitates neutrino-driven explosions |
recent analyses suggest that distance residuals measured from type ia supernovae (sne ia) are correlated with local host galaxy properties within a few kiloparsecs of the sn explosion. however, the well-established correlation with global host galaxy properties is nearly as significant, with a shift of 0.06 mag across ... | should type ia supernova distances be corrected for their local environments? |
we study gravitational waves (gws) from a set of 2d multigroup neutrino radiation hydrodynamic simulations of core-collapse supernovae (ccsne). our goal is to systematize the current knowledge about the post-bounce ccsn gw signal and recognize the templatable features that could be used by the ground-based laser interf... | the gravitational wave signal from core-collapse supernovae |
we study a power-law f (r) gravity with an early dark energy term, that can describe both the early-time and the late-time acceleration of the universe. we confront this scenario with recent observational data including the pantheon type ia supernovae, measurements of the hubble parameter h (z) (cosmic chronometers), d... | early dark energy with power-law f(r) gravity |
we present the results from a search for gravitational-wave transients associated with core-collapse supernovae observed optically within 30 mpc during the third observing run of advanced ligo and advanced virgo. no gravitational wave associated with a core-collapse supernova has been identified. we then report the det... | an optically targeted search for gravitational waves emitted by core-collapse supernovae during the third observing run of advanced ligo and advanced virgo |
we report the first search result for the flux of astrophysical electron antineutrinos for energies ${ \mathcal o }(10)\,\mathrm{mev}$ in the gadolinium-loaded super-kamiokande (sk) detector. in 2020 june, gadolinium was introduced to the ultrapure water of the sk detector in order to detect neutrons more efficiently. ... | search for astrophysical electron antineutrinos in super-kamiokande with 0.01% gadolinium-loaded water |
we present observations of sn 2021csp, the second example of a newly identified type of supernova (sn) hallmarked by strong, narrow, p cygni carbon features at early times (type icn). the sn appears as a fast and luminous blue transient at early times, reaching a peak absolute magnitude of -20 within 3 days due to stro... | the type icn sn 2021csp: implications for the origins of the fastest supernovae and the fates of wolf-rayet stars |
using spectral line observations of hnco, n2h+, and hnc, we investigate the kinematics of dense gas in the central ∼250 pc of the galaxy. we present scouse (semi-automated multi-component universal spectral-line fitting engine), a line-fitting algorithm designed to analyse large volumes of spectral line data efficientl... | molecular gas kinematics within the central 250 pc of the milky way |
we explore the influence of non-axisymmetric modes on the dynamics of the collapsed core of rotating, magnetized high-mass stars in three-dimensional simulations of a rapidly rotating star with an initial mass of $m_{\rm {\small zams}} = 35 \, \mathrm{m}_{\odot }$ endowed with four different pre-collapse configurations... | magnetorotational core collapse of possible grb progenitors - iii. three-dimensional models |
we discuss new methods to integrate the cosmic ray (cr) evolution equations coupled to magnetohydrodynamics on an unstructured moving mesh, as realized in the massively parallel arepo code for cosmological simulations. we account for diffusive shock acceleration of crs at resolved shocks and at supernova remnants in th... | simulating cosmic ray physics on a moving mesh |
we study the evolution of the binary black hole (bbh) mass distribution across cosmic time. the second gravitational-wave transient catalog (gwtc-2) from ligo/virgo contains bbh events out to redshifts z ∼ 1, with component masses in the range ∼5-80 m⊙. in this catalog, the biggest bbhs, with m1 ≳ 45 m⊙, are only found... | when are ligo/virgo's big black hole mergers? |
we present constraints on extensions to the λ cdm cosmological model from measurements of the e -mode polarization autopower spectrum and the temperature-e -mode cross-power spectrum of the cosmic microwave background (cmb) made using 2018 spt-3g data. the extensions considered vary the primordial helium abundance, the... | constraints on λ cdm extensions from the spt-3g 2018 e e and t e power spectra |
we simulate the scientific performance of the nancy grace roman space telescope high latitude survey (hls) on dark energy and modified gravity. the 1.6-yr hls reference survey is currently envisioned to image 2000 deg2 in multiple bands to a depth of ~26.5 in y, j, h and to cover the same area with slit-less spectrosco... | cosmology with the roman space telescope - multiprobe strategies |
asteroseismology has grown from its beginnings three decades ago to a mature field teeming with discoveries and applications. this phenomenal growth has been enabled by space photometry with precision 10-100 times better than ground-based observations, with nearly continuous light curves for durations of weeks to years... | asteroseismology across the hertzsprung-russell diagram |
recent modeling of hydrogen-rich type ii supernova (sn ii) light curves suggests the presence of dense circumstellar material (csm) surrounding the exploding progenitor stars. this has important implications for the activity and structure of massive stars near the end of their lives. since previous work focused on just... | measuring the progenitor masses and dense circumstellar material of type ii supernovae |
the explosive death of a star as a supernova is one of the most dramatic events in the universe. supernovae have an outsized impact on many areas of astrophysics: they are major contributors to the chemical enrichment of the cosmos and significantly influence the formation of subsequent generations of stars and the evo... | observational properties of thermonuclear supernovae |
several large neutrino telescopes, operating at various sites around the world, have as their main objective the first detection of neutrinos emitted by a gravitational collapse in the milky way. the success of these observation programs depends on the rate of supernova core collapse in the milky way, r. in this work, ... | on the rate of core collapse supernovae in the milky way |
star-forming gas clouds are strongly magnetized, and their ionization fractions are high enough to place them close to the regime of ideal magnetohydrodyamics on all by the smallest size scales. in this review we discuss the effects of magnetic fields on the star formation rate (sfr) in these clouds, and on the mass sp... | the role of magnetic fields in setting the star formation rate and the initial mass function |
we report on the detection of seven bursts from the periodically active, repeating fast radio burst (frb) source frb 180916.j0158+65 in the 300-400 mhz frequency range with the green bank telescope (gbt). emission in multiple bursts is visible down to the bottom of the gbt band, suggesting that the cutoff frequency (if... | detection of repeating frb 180916.j0158+65 down to frequencies of 300 mhz |
as a long gamma-ray burst (grb) jet propagates within the stellar atmosphere it creates a cocoon composed of an outer newtonian shocked stellar material and an inner (possibly relativistic) shocked jet. the jet deposits {10}51{--}{10}52 erg into this cocoon. this is comparable to the energies of the grb and of the acco... | the observable signatures of grb cocoons |
interactions with neutrons and protons play a crucial role for the neutrino opacity of matter in the supernova core. their current implementation in many simulation codes, however, is rather schematic and ignores not only modifications for the correlated nuclear medium of the nascent neutron star, but also free-space c... | neutrino-driven explosion of a 20 solar-mass star in three dimensions enabled by strange-quark contributions to neutrino-nucleon scattering |
context. persistent tension between low-redshift observations and the cosmic microwave background radiation (cmb), in terms of two fundamental distance scales set by the sound horizon rd and the hubble constant h0, suggests new physics beyond the standard model, departures from concordance cosmology, or residual system... | cosmic dissonance: are new physics or systematics behind a short sound horizon? |
the stochastic gravitational-wave backgrounds (sgwbs) for current detectors are dominated by binary black-hole (bbh) and binary neutron-star (bns) coalescences. the sensitivity of current networks of gravitational-wave (gw) detectors allows only a small fraction of bbhs and bnss to be resolved and subtracted, but previ... | compact binary foreground subtraction in next-generation ground-based observatories |
core-collapse supernovae are among the most powerful explosions in the universe, emitting thermal neutrinos that carry away the majority of the gravitational binding energy released. these neutrinos create a diffuse supernova neutrino background (dsnb), one of the largest energy budgets among all radiation backgrounds.... | diffuse neutrino background from past core collapse supernovae |
recent first-principles approaches to semiconductors are reviewed, with an emphasis on theoretical insight into emerging materials and in silico exploration of as-yet-unreported materials. as relevant theory and methodologies have developed, along with computer performance, it is now feasible to predict a variety of ma... | design and exploration of semiconductors from first principles: a review of recent advances |
we use hydrodynamical simulations to study the milky way's central molecular zone (cmz). the simulations include a non-equilibrium chemical network, the gas self-gravity, star formation, and supernova feedback. we resolve the structure of the interstellar medium at sub-parsec resolution while also capturing the interac... | simulations of the milky way's central molecular zone - i. gas dynamics |
we investigate an interacting dark sector scenario in which the vacuum energy is free to interact with cold dark matter (cdm), which itself is assumed to cluster under the sole action of gravity, i.e. it is in freefall (geodesic), as in λcdm. the interaction is characterized by a dimensionless coupling qv(z), in genera... | constraints on the interacting vacuum-geodesic cdm scenario |
using the new state-of-the-art core-collapse supernova (ccsn) code fornax, we have simulated the three-dimensional dynamical evolution of the cores of 9-, 10-, 11-, 12-, and 13-m⊙ stars from the onset of collapse. stars from 8 to 13 m⊙ constitute roughly 50 per cent of all massive stars, so the explosive potential for ... | three-dimensional supernova explosion simulations of 9-, 10-, 11-, 12-, and 13-m⊙ stars |
knowing the late time evolution of the universe and finding out the causes for this evolution are the important challenges of modern cosmology. in this work, we adopt a model-independent cosmographic approach and approximate the hubble parameter considering the pade approximation which works better than the standard ta... | model-independent constraints on dark energy evolution from low-redshift observations |
recently, a full-shape analysis of large-scale structure (lss) data was employed to provide new constraints on a class of early dark energy models. in this paper, we derive similar constraints on new early dark energy (nede) using the publicly available pybird code, which makes use of the effective field theory of lss.... | new early dark energy is compatible with current lss data |
we utilize high-resolution cosmological simulations to reveal that high-redshift galaxies tend to undergo a robust 'wet compaction' event when near a 'golden' stellar mass of $\sim \!\!10^{10}\, \rm m_\odot$ . this is a gaseous shrinkage to a compact star-forming phase, a 'blue nugget' (bn), followed by central quenchi... | wet compaction to a blue nugget: a critical phase in galaxy evolution |
a longstanding problem in the study of supernovae (sne) has been the relationship between the type iip and type iil subclasses. whether they come from distinct progenitors or they are from similar stars with some property that smoothly transitions from one class to another has been the subject of much debate. here, usi... | unifying type ii supernova light curves with dense circumstellar material |
we present the first systematic investigation of spectral properties of 17 type ic supernovae (sne ic), 10 broad-lined sne ic (sne ic-bl) without observed gamma-ray bursts (grbs), and 11 sne ic-bl with grbs (sn-grbs) as a function of time in order to probe their explosion conditions and progenitors. using a number of n... | the spectral sn-grb connection: systematic spectral comparisons between type ic supernovae and broad-lined type ic supernovae with and without gamma-ray bursts |
protogalaxies forming in low-mass dark matter haloes are thought to provide the majority of ionizing photons needed to reionize the universe, due to their high escape fractions of ionizing photons. we study how the escape fraction in high-redshift galaxies relates to the physical properties of the halo in which the gal... | the first billion years project: the escape fraction of ionizing photons in the epoch of reionization |
almost all massive stars explode as supernovae and form a black hole or neutron star. the remnant mass and the impact of the chemical yield on subsequent star formation and galactic evolution strongly depend on the internal physics of the progenitor star, which is currently not well understood. the theoretical uncertai... | low-frequency gravity waves in blue supergiants revealed by high-precision space photometry |
we present results of three-dimensional (3d), radiation-magnetohydrodynamics (mhd) simulations of core-collapse supernovae in full general relativity (gr) with spectral neutrino transport. in order to study the effects of the progenitor's rotation and magnetic fields, we compute three models, where the precollapse rota... | magnetorotational explosion of a massive star supported by neutrino heating in general relativistic three-dimensional simulations |
in this paper, we investigate the cosmological viability of a double scalar field model motivated by warm inflation. to this end, we first set up the theoretical framework in which dark energy, dark matter and inflation are accounted for in a triple unification scheme. we then compute the overall dynamics of the model,... | cosmological viability of a double field unified model from warm inflation |
twenty years after the discovery that the expansion of the universe is accelerating, a new finding is now challenging our understanding of the cosmos. recent studies have shown that the hubble constant, the speed of expansion measured today, provides values in significant tension when measured from the cosmic microwave... | addressing the hubble tension with cosmic chronometers |
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