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the detection of gravitational waves from binary black-hole mergers by the ligo-virgo collaboration marks the dawn of an era when general-relativistic dynamics in its most extreme manifestation is directly accessible to observation. in the future, planned (space-based) observatories operating in the millihertz band wil... | self-force and radiation reaction in general relativity |
we propose the generalized holographic dark energy model where the infrared cutoff is identified with the combination of the frw universe parameters: the hubble rate, particle and future horizons, cosmological constant, the universe lifetime (if finite) and their derivatives. it is demonstrated that with the correspond... | covariant generalized holographic dark energy and accelerating universe |
the international gamma-ray astrophysics laboratory (i n t e g r a l ) satellite has yielded unprecedented measurements of the soft gamma-ray spectrum of our galaxy. here we use those measurements to set constraints on dark matter (dm) that decays or annihilates into photons with energies e ≈0.02 - 2 mev . first, we re... | i n t e g r a l constraints on primordial black holes and particle dark matter |
"dark quark nuggets," a lump of dark quark matter, can be produced in the early universe for a wide range of confining gauge theories and serve as a macroscopic dark matter candidate. the two necessary conditions, a nonzero dark baryon number asymmetry and a first-order phase transition, can easily be satisfied for man... | dark quark nuggets |
we present the bacco project, a simulation framework specially designed to provide highly-accurate predictions for the distribution of mass, galaxies, and gas as a function of cosmological parameters. in this paper, we describe our main suite of gravity-only simulations ($l\sim 2\,$ gpc and 43203 particles) and present... | the bacco simulation project: exploiting the full power of large-scale structure for cosmology |
we formulate barrow holographic dark energy, by applying the usual holographic principle at a cosmological framework, but using the barrow entropy instead of the standard bekenstein-hawking one. the former is an extended black-hole entropy that arises due to quantum-gravitational effects which deform the black-hole sur... | barrow holographic dark energy |
we have recently proposed a new class of gravitational scalar-tensor theories free from ostrogradski instabilities, in ref. [1]. as they generalize horndeski theories, or "generalized" galileons, we call them g3. these theories possess a simple formulation when the time hypersurfaces are chosen to coincide with the uni... | exploring gravitational theories beyond horndeski |
we analyse a simple extension of the sm with just an additional scalar singlet coupled to the higgs boson. we discuss the possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. we show that a large portion of the model paramet... | gravitational wave, collider and dark matter signals from a scalar singlet electroweak baryogenesis |
we show that simplified models used to describe the interactions of dark matter with standard model particles do not in general respect gauge invariance and that perturbative unitarity may be violated in large regions of the parameter space. the modifications necessary to cure these inconsistencies may imply a much ric... | implications of unitarity and gauge invariance for simplified dark matter models |
the catwise2020 catalog consists of 1,890,715,640 sources over the entire sky selected from wide-field infrared survey explorer (wise) and neowise survey data at 3.4 and 4.6 μm (w1 and w2) collected from 2010 january 7 to 2018 december 13. this data set adds two years to that used for the catwise preliminary catalog, b... | the catwise2020 catalog |
we search for a first-order phase transition gravitational wave signal in 45 pulsars from the nanograv 12.5-year dataset. we find that the data can be modeled in terms of a strong first order phase transition taking place at temperatures below the electroweak scale. however, we do not observe any strong preference for ... | searching for gravitational waves from cosmological phase transitions with the nanograv 12.5-year dataset |
aims: the nanohertz gravitational wave background (gwb) is expected to be an aggregate signal of an ensemble of gravitational waves emitted predominantly by a large population of coalescing supermassive black hole binaries in the centres of merging galaxies. pulsar timing arrays (ptas), which are ensembles of extremely... | the second data release from the european pulsar timing array. ii. customised pulsar noise models for spatially correlated gravitational waves |
recently, it has been claimed that inflationary models with an inflection point in the scalar potential can produce a large resonance in the power spectrum of curvature perturbation. in this paper however we show that the previous analyses are incorrect. the reason is twofold: firstly, the inflaton is over-shot from a ... | on primordial black holes from an inflection point |
we use gaia data release 2 to determine the mean proper motions for 150 milky way globular clusters (almost the entire known population), with a typical uncertainty of 0.05 mas yr-1 limited mainly by systematic errors. combining them with distance and line-of-sight velocity measurements from the literature, we analyse ... | proper motions and dynamics of the milky way globular cluster system from gaia dr2 |
we study an axion-like particle (alp) that experiences a first-order phase transition with respect to its mass or potential minimum. this can be realized if the alp obtains a potential from non-perturbative effects of su(n) gauge theory that is confined via the first-order phase transition. similar dynamics are achieve... | axion dark matter from first-order phase transition, and very high energy photons from grb 221009a |
we present an updated analysis of the first-order phase transition associated with symmetry breaking in the early universe in a classically scale-invariant model extended with a new su(2) gauge group. including recent developments in understanding supercooled phase transitions, we compute all of its characteristics and... | conformal model for gravitational waves and dark matter: a status update |
we present a catalog of hard x-ray sources detected in the first 105 months of observations with the burst alert telescope (bat) coded-mask imager on board the swift observatory. the 105-month swift-bat survey is a uniform hard x-ray all-sky survey with a sensitivity of 8.40× {10}-12 {erg} {{{s}}}-1 {cm}}-2 over 90% of... | the 105-month swift-bat all-sky hard x-ray survey |
adopting a binned method, we model-independently reconstruct the mass function of primordial black holes (pbhs) from gwtc-3 and find that such a pbh mass function can be explained by a broad red-tilted power spectrum of curvature perturbations if all the events (or the small effective spin events) have a primordial ori... | confronting the primordial black hole scenario with the gravitational-wave events detected by ligo-virgo |
we present a measurement of the baryon acoustic oscillation (bao) scale at redshift z = 2.35 from the three-dimensional correlation of lyman-α (lyα) forest absorption and quasars. the study uses 266 590 quasars in the redshift range 1.77 < z < 3.5 from the sloan digital sky survey (sdss) data release 14 (dr14). t... | baryon acoustic oscillations from the cross-correlation of lyα absorption and quasars in eboss dr14 |
gravity theories that modify general relativity in the slow-motion regime can introduce nonperturbative corrections to the stochastic gravitational-wave background~(sgwb) from supermassive black-hole binaries in the nano-hertz band, while remaining perturbative in the highly-relativistic regime and satisfying current p... | novel tests of gravity using nano-hertz stochastic gravitational-wave background signals |
we live in a time of extraordinary discovery and progress in astronomy and astrophysics. the next decade will transform our understanding of the universe and humanity's place in it. every decade the u.s. agencies that provide primary federal funding for astronomy and astrophysics request a survey to assess the status o... | pathways to discovery in astronomy and astrophysics for the 2020s |
some time ago we have suggested that positive vacuum energy exhibits a finite quantum break time, which can be a signal that a positive cosmological constant is inconsistent. from the requirement that universe never undergoes through quantum breaking, we have derived an absolute lower bound on the speed of variation of... | on exclusion of positive cosmological constant |
we report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 tev and 1 pev in the galactic disk. particularly, all gamma rays above 398 tev are observed apart from known tev gamma-ray sources and compatible with expectations from the hadronic emission scenario in which gamma... | first detection of sub-pev diffuse gamma rays from the galactic disk: evidence for ubiquitous galactic cosmic rays beyond pev energies |
the baryon oscillation spectroscopic survey (boss), part of the sloan digital sky survey (sdss) iii project, has provided the largest survey of galaxy redshifts available to date, in terms of both the number of galaxy redshifts measured by a single survey, and the effective cosmological volume covered. key to analysing... | sdss-iii baryon oscillation spectroscopic survey data release 12: galaxy target selection and large-scale structure catalogues |
we propose a mechanism that forms primordial black holes (pbhs) via a first-order electroweak phase transition (foewpt). the foewpt is realized by extending the standard model with a real singlet scalar, while the pbh formation is achieved by the collapse of nontopological solitons called fermi-balls. such solitons for... | primordial black holes from an electroweak phase transition |
a proper understanding of the milky way (mw) dwarf galaxies in a cosmological context requires knowledge of their 3d velocities and orbits. however, proper motion (pm) measurements have generally been of limited accuracy and are available only for more massive dwarfs. we therefore present a new study of the kinematics ... | gaia dr2 proper motions of dwarf galaxies within 420 kpc. orbits, milky way mass, tidal influences, planar alignments, and group infall |
in recent years, gravity has enjoyed considerable attention in the literature and important results have been obtained. however, the question of how many physical degrees of freedom the theory propagates—and how this number may depend on the form of the function f—has not been answered satisfactorily. in this article i... | hamiltonian analysis of f(q)f(\\mathbb {q}) gravity and the failure of the dirac–bergmann algorithm for teleparallel theories of gravity |
pulsar timing array collaborations have recently announced the discovery of a stochastic gravitational wave (gw) background at nanohertz frequencies. we analyze the gw signals from the domination of ultralow mass primordial black holes (pbhs) in the early universe and show that they can explain this recent discovery. t... | ultralow mass primordial black holes in the early universe can explain the pulsar timing array signal |
we present a combined tomographic weak gravitational lensing analysis of the kilo degree survey (kv450) and the dark energy survey (des-y1). we homogenize the analysis of these two public cosmic shear datasets by adopting consistent priors and modeling of nonlinear scales, and determine new redshift distributions for d... | kids+viking-450 and des-y1 combined: cosmology with cosmic shear |
cosmological observations indicate that most of the matter in the universe is dark matter. dark matter in the form of weakly interacting massive particles (wimps) can be detected directly, via its elastic scattering off target nuclei. most current direct detection experiments only measure the energy of the recoiling nu... | a review of the discovery reach of directional dark matter detection |
we propose an alternative refined de sitter conjecture. it is given by a natural condition on a combination of the first and second derivatives of the scalar potential. we derive our conjecture in the same weak coupling, semi-classical regime where the previous refined de sitter conjecture was derived, using the same t... | further refining the de sitter swampland conjecture |
we present a blind time-delay cosmographic analysis for the lens system des j0408-5354. this system is extraordinary for the presence of two sets of multiple images at different redshifts, which provide the opportunity to obtain more information at the cost of increased modelling complexity with respect to previously a... | strides: a 3.9 per cent measurement of the hubble constant from the strong lens system des j0408-5354 |
black hole superradiance is a powerful probe of light, weakly coupled hidden sector particles. many candidate particles, such as axions, generically have self-interactions that can influence the evolution of the superradiant instability. as pointed out in [a. gruzinov, arxiv:1604.06422.] in the context of a toy model, ... | black hole superradiance of self-interacting scalar fields |
in the purely gravitational dark matter scenario, the dark matter particle does not have any interaction except for gravitational one. we study the gravitational particle production of dark matter particle in such a minimal setup and show that correct amount of dark matter can be produced depending on the inflation mod... | production of purely gravitational dark matter |
we apply the recently developed positivity bounds for particles with spin, applied away from the forward limit, to the low energy effective theories of massive spin-1 and spin-2 theories. for spin-1 theories, we consider the generic proca eft which arises at low energies from a heavy higgs mechanism, and the special ca... | positivity bounds for massive spin-1 and spin-2 fields |
the nature of dark matter is one of the most pressing questions in physics. yet all our present knowledge of the dark sector to date comes from its gravitational interactions with astrophysical systems. moreover, astronomical results still have immense potential to constrain the particle properties of dark matter in th... | gravitational probes of dark matter physics |
we revisit the decoupling of neutrinos in the early universe with flavour oscillations. we rederive the quantum kinetic equations which determine the neutrino evolution based on a bbgky-like hierarchy, and include for the first time the full collision term, with both on- and off-diagonal terms for all relevant reaction... | neutrino decoupling including flavour oscillations and primordial nucleosynthesis |
we report the first experimental results on spin-dependent elastic weakly interacting massive particle (wimp) nucleon scattering from the xenon1t dark matter search experiment. the analysis uses the full ton year exposure of xenon1t to constrain the spin-dependent proton-only and neutron-only cases. no significant sign... | constraining the spin-dependent wimp-nucleon cross sections with xenon1t |
these lectures provide an introduction to models and direct detection of dark matter. we summarize the general features and motivations for candidates in the full dark matter mass range, and then restrict to the kev-tev mass window. candidates in this window can be produced by thermal mechanisms in the standard cosmolo... | tasi lectures on dark matter models and direct detection |
primordial black holes can have substantial spin—a fundamental property that has a strong effect on its evaporation rate. we conduct a comprehensive study of the detectability of primordial black holes with non-negligible spin, via the searches for the neutrinos and positrons in the mev energy range. diffuse supernova ... | neutrino and positron constraints on spinning primordial black hole dark matter |
we estimate the gravitational wave spectra generated in strongly supercooled phase transitions by bubble collisions and fluid motion. we derive analytically in the thin-wall approximation the efficiency factor that determines the share of the energy released in the transition between the scalar field and the fluid. we ... | gravitational waves from bubble collisions and fluid motion in strongly supercooled phase transitions |
many motivated extensions of the standard model predict the existence of cosmic strings. gravitational waves originating from the dynamics of the resulting cosmic string network have the ability to probe many otherwise inaccessible properties of the early universe. in this study we show how the spectrum of gravitationa... | probing the pre-bbn universe with gravitational waves from cosmic strings |
we suggest a novel experimental concept for detecting mev-to-gev-mass dark matter, in which the dark matter scatters off electrons in a scintillating target and produces a signal of one or a few photons. new large-area photodetectors are needed to measure the photon signal with negligible dark counts, which could be co... | direct detection of sub-gev dark matter with scintillating targets |
we study the distortions of equilibrium spectra of relic neutrinos due to the interactions with electrons, positrons, and neutrinos in the early universe. we solve the integro-differential kinetic equations for the neutrino density matrix, including three-flavor oscillations and finite temperature corrections from qed ... | a precision calculation of relic neutrino decoupling |
we present the survey design and initial results of the alma cycle 9 program of dualz, which aims to establish a joint alma and jwst public legacy field targeting the massive galaxy cluster abell 2744. dualz features a contiguous $4'\times6'$ alma 30-ghz-wide mosaic in band 6, covering areas of $\mu>2$ down to a sen... | dualz: deep uncover-alma legacy high-z survey |
it is well known that a primordial black hole (pbh) can be generated in the inflation process of the early universe, especially when the inflation field has a number of non-trivial features that could break the slow-roll condition. in this study, we investigate a toy model of inflation with bumpy potential, which has o... | on primordial black holes and secondary gravitational waves generated from inflation with solo/multi-bumpy potential |
we outline the unique opportunities and challenges in the search for "ultraheavy" dark matter candidates with masses between roughly 10 tev and the planck scale m_{\rm pl} ≈ 10^{16} tev. this mass range presents a wide and relatively unexplored dark matter parameter space, with a rich space of possible models and cosmi... | snowmass2021 cosmic frontier white paper: ultraheavy particle dark matter |
we examine the effects of a stiff pre-recombination era on the present day's energy spectrum of the primordial gravitational waves. if the background total equation of state parameter at the pre-recombination era is described by a kination era one, this directly affects the modes with characteristic wavenumbers which r... | a stiff pre-cmb era with a mildly blue-tilted tensor inflationary era can explain the 2023 nanograv signal |
singularities in any physical theory are either remarkable indicators of the unknown underlying fundamental theory, or indicate a change in the description of the physical reality. in general relativity there are three fundamental kinds of singularities that might occur, firstly the black hole spacelike crushing singul... | finite-time cosmological singularities and the possible fate of the universe |
ultra-light primordial black holes, with masses mpbh < 109g, evaporate before big-bang nucleosynthesis and can therefore not be directly constrained. they can however be so abundant that they dominate the universe content for a transient period (before reheating the universe via hawking evaporation). if this happens... | gravitational waves from a universe filled with primordial black holes |
we show that the recently reported cosmic gravitational wave background by the nanograv 15-year collaboration may be the result of resonant particle creation during inflation. for the appropriate amplitude and particle mass an enhancement of the primordial scalar power spectrum could induce secondary induced gravitatio... | is the nanograv detection evidence of resonant particle creation during inflation? |
by using the gauss-bonnet theorem, the bending angle of light in a static, spherically symmetric and asymptotically flat spacetime has been recently discussed, especially by taking account of the finite distance from a lens object to a light source and a receiver [ishihara, suzuki, ono, asada, phys. rev. d 95, 044017 (... | gravitomagnetic bending angle of light with finite-distance corrections in stationary axisymmetric spacetimes |
the free-streaming length of dark matter depends on fundamental dark matter physics, and determines the abundance and concentration of dark matter haloes on sub-galactic scales. using the image positions and flux ratios from eight quadruply imaged quasars, we constrain the free-streaming length of dark matter and the a... | warm dark matter chills out: constraints on the halo mass function and the free-streaming length of dark matter with eight quadruple-image strong gravitational lenses |
despite considerable efforts over the past decade, only 34 fast radio bursts—intense bursts of radio emission from beyond our galaxy—have been reported1,2. attempts to understand the population as a whole have been hindered by the highly heterogeneous nature of the searches, which have been conducted with telescopes of... | the dispersion-brightness relation for fast radio bursts from a wide-field survey |
primordial black holes (pbhs) generated by gravitational collapse of large primordial overdensities can be a fraction of the observed dark matter. in this paper, we introduce a mechanism to produce a large peak in the primordial power spectrum (pps) in two-field inflationary models characterized by two stages of inflat... | generating pbhs and small-scale gws in two-field models of inflation |
in the curvaton scenario, the curvature perturbation is generated after inflation at the curvaton decay, which may have a prominent non-gaussian effect. for a model with a nontrivial kinetic term, an enhanced curvature perturbation on a small scale can be realized, which can lead to copious production of primordial bla... | primordial black hole formation in nonminimal curvaton scenarios |
the early dark energy (ede) scenario aims to increase the value of the hubble constant (h0) inferred from cosmic microwave background (cmb) data over that found in the standard cosmological model (λ cdm ), via the introduction of a new form of energy density in the early universe. the ede component briefly accelerates ... | atacama cosmology telescope: constraints on prerecombination early dark energy |
we present a new method for consistent, joint analysis of the pre- and post-reconstruction galaxy two-point functions of the boss survey. the post-reconstruction correlation function is used to accurately measure the distance-redshift relation and expansion history, while the pre-reconstruction power spectrum multipole... | a new analysis of galaxy 2-point functions in the boss survey, including full-shape information and post-reconstruction bao |
in this paper we present imrphenomxas, a thorough overhaul of the imrphenomd [s. husa et al., phys. rev. d 93, 044006 (2016), 10.1103/physrevd.93.044006; s. khan et al., phys. rev. d 93, 044007 (2016), 10.1103/physrevd.93.044007] waveform model, which describes the dominant l =2 , |m |=2 spherical harmonic mode of nonp... | setting the cornerstone for a family of models for gravitational waves from compact binaries: the dominant harmonic for nonprecessing quasicircular black holes |
despite the outstanding achievements of modern cosmology, the classical dispute on the precise value of h0, which is the first ever parameter of modern cosmology and one of the prime parameters in the field, still goes on and on after over half a century of measurements. recently the dispute came to the spotlight with ... | the h0 tension in light of vacuum dynamics in the universe |
assuming the existence of a local, analytic, unitary uv completion in a poincaré invariant scalar field theory with a mass gap, we derive an infinite number of positivity requirements using the known properties of the amplitude at and away from the forward scattering limit. these take the form of bounds on combinations... | positivity bounds for scalar field theories |
we measure the imprint of primordial baryon acoustic oscillations (baos) in the correlation function of lyα absorption in quasar spectra from the baryon oscillation spectroscopic survey (boss) and the extended boss (eboss) in data release 14 (dr14) of the sloan digital sky survey (sdss)-iv. in addition to 179 965 spect... | baryon acoustic oscillations at z = 2.34 from the correlations of lyα absorption in eboss dr14 |
mobile gravimetry is important in metrology, navigation, geodesy, and geophysics. atomic gravimeters could be among the most accurate mobile gravimeters, but are currently constrained by being complex and fragile. here, we demonstrate a mobile atomic gravimeter, measuring tidal gravity variations in the laboratory as w... | gravity surveys using a mobile atom interferometer |
we consider the swampland distance and de sitter conjectures, of respective order one parameters λ and c. inspired by the recent trans-planckian censorship conjecture (tcc), we propose a generalization of the distance conjecture, which bounds λ to be a half of the tcc bound for c, i.e. λ ≥1/2 √{2/3 } in 4d. in addition... | the web of swampland conjectures and the tcc bound |
we consider galileon inflation in the effective field theory (eft) framework and examine the possibility for pbh formation during slow roll (sr) to ultra slow roll (usr) transitions. we show that loop corrections to the power spectrum, in this case, do not impose additional constraints on the masses of pbhs produced. w... | galileon inflation evades the no-go for pbh formation in the single-field framework |
first-order phase transitions, which take place when the symmetries are predominantly broken (and masses are then generated) through radiative corrections, produce observable gravitational waves and primordial black holes. we provide a model-independent approach that is valid for large-enough supercooling to quantitati... | supercooling in radiative symmetry breaking: theory extensions, gravitational wave detection and primordial black holes |
these lecture notes are based on a course given by mark hindmarsh at the 24th saalburg summer school 2018 and written up by marvin lüben, johannes lumma and martin pauly. the aim is to provide the necessary basics to understand first-order phase transitions in the early universe, to outline how they leave imprints in g... | phase transitions in the early universe |
the stochastic signal detected by pulsar timing arrays (ptas) has raised great interest in understanding its physical origin. assuming the signal is a cosmological gravitational-wave background produced by overly large primordial curvature perturbations, we investigate the sound speed resonance effect with an oscillato... | confronting sound speed resonance with pulsar timing arrays |
we present the results of the most comprehensive survey of the galactic plane in very high-energy (vhe) γ-rays, including a public release of galactic sky maps, a catalog of vhe sources, and the discovery of 16 new sources of vhe γ-rays. the high energy spectroscopic system (h.e.s.s.) galactic plane survey (hgps) was a... | the h.e.s.s. galactic plane survey |
we study the topological susceptibility in 2 + 1 flavor qcd above the chiral crossover transition temperature using highly improved staggered quark action and several lattice spacings corresponding to temporal extent of the lattice, nτ = 6 , 8 , 10 and 12. we observe very distinct temperature dependences of the topolog... | the topological susceptibility in finite temperature qcd and axion cosmology |
the lyman-α forest 1d flux power spectrum is a powerful probe of several cosmological parameters. assuming a λcdm cosmology including massive neutrinos, we find that the latest sdss dr14 boss and eboss lyman-α forest data is in very good agreement with current weak lensing constraints on (ωm, σ8) and has the same small... | hints, neutrino bounds, and wdm constraints from sdss dr14 lyman-α and planck full-survey data |
we present a multi-messenger measurement of the hubble constant h 0 using the binary-black-hole merger gw170814 as a standard siren, combined with a photometric redshift catalog from the dark energy survey (des). the luminosity distance is obtained from the gravitational wave signal detected by the laser interferometer... | first measurement of the hubble constant from a dark standard siren using the dark energy survey galaxies and the ligo/virgo binary-black-hole merger gw170814 |
we report the first search results for axion dark matter using an 18 t high-temperature superconducting magnet haloscope. the scan frequency ranges from 4.7789 to 4.8094 ghz. no significant signal consistent with the galactic halo dark matter axion is observed. the results set the best upper bound of axion-photon-photo... | searching for invisible axion dark matter with an 18 t magnet haloscope |
we report the detection for the first time in space of three new pure hydrocarbon cycles in tmc-1: c-c3hcch (ethynyl cyclopropenylidene), c-c5h6 (cyclopentadiene), and c-c9h8 (indene). we derive a column density of 3.1 × 1011 cm−2 for the first cycle and similar values, in the range (1−2) × 1013 cm−2, for the second an... | pure hydrocarbon cycles in tmc-1: discovery of ethynyl cyclopropenylidene, cyclopentadiene, and indene |
we present cosmological constraints from a joint analysis of the pre- and post-reconstruction galaxy power spectrum multipoles from the final data release of the baryon oscillation spectroscopic survey (boss). geometric constraints are obtained from the positions of bao peaks in reconstructed spectra, which are analyze... | combining full-shape and bao analyses of galaxy power spectra: a 1.6% cmb-independent constraint on h0 |
we compile an updated list of 38 measurements of the hubble parameter h(z) between redshifts 0.07 ≤ z ≤ 2.36 and use them to place constraints on model parameters of constant and time-varying dark energy cosmological models, both spatially flat and curved. we use five models to measure the redshift of the cosmological ... | hubble parameter measurement constraints on the redshift of the deceleration-acceleration transition, dynamical dark energy, and space curvature |
we search for gravitational-wave signals produced by cosmic strings in the advanced ligo and virgo full o3 dataset. search results are presented for gravitational waves produced by cosmic string loop features such as cusps, kinks, and, for the first time, kink-kink collisions. a template-based search for short-duration... | constraints on cosmic strings using data from the third advanced ligo-virgo observing run |
among the most important goals in cosmology is detecting and quantifying small (m_halo∼eq 10^{6-9} m_{⊙}) dark matter (dm) subhaloes. current probes around the milky way (mw) are most sensitive to such substructure within ∼20 kpc of the halo centre, where the galaxy contributes significantly to the potential. we explor... | not so lumpy after all: modelling the depletion of dark matter subhaloes by milky way-like galaxies |
the widefield askap l-band legacy all-sky blind survey (wallaby) is a next-generation survey of neutral hydrogen (hi) in the local universe. it uses the widefield, high-resolution capability of the australian square kilometer array pathfinder (askap), a radio interferometer consisting of 36 ×12 -m dishes equipped with ... | wallaby - an ska pathfinder hi survey |
our understanding of the state of the universe between the end of inflation and big bang nucleosynthesis (bbn) is incomplete. the dynamics at the end of inflation are rich and a potential source of observational signatures. reheating, the energy transfer between the inflaton and standard model fields (possibly through ... | nonperturbative dynamics of reheating after inflation: a review |
in the past twenty years, the reconnaissance of 12co and 13co emission in the milky way by single-dish millimeter-wave telescopes has expanded our view and understanding of interstellar molecular gas. we enumerate the major surveys of co emission along the galactic plane and summarize the various approaches that levera... | molecular clouds in the milky way |
we compute the tree-level late-time graviton four-point correlation function, and the related quartic wavefunction coefficient, for einstein gravity in de sitter spacetime. we derive this result in several ways: by direct calculation, using the in-in formalism and the wavefunction of the universe; by a heuristic deriva... | the graviton four-point function in de sitter space |
the λcdm cosmology passes demanding tests that establish it as a good approximation to reality. the theory is incomplete, of course, and open issues are being examined in active research programs. i offer a review of less widely discussed anomalies that might also point to hints to a still better cosmological theory if... | anomalies in physical cosmology |
motivated by the recently reported anomaly in w boson mass by the cdf collaboration with 7σ statistical significance, we consider a singlet-doublet (sd) majorana fermion dark matter (dm) model where the required correction to w boson mass arises from radiative corrections induced by sd fermions. while a single generati... | singlet-doublet fermion origin of dark matter, neutrino mass and w-mass anomaly |
to account for the dark-matter content in our universe, postinflationary scenarios predict for the qcd axion a mass in the range (10 - 103) μ ev . searches with haloscope experiments in this mass range require the monitoring of resonant cavity modes with frequency above 5 ghz, where several experimental limitations occ... | galactic axions search with a superconducting resonant cavity |
we present a catalog of sources detected above 10 gev by the fermi large area telescope (lat) in the first 7 years of data using the pass 8 event-level analysis. this is the third catalog of hard fermi-lat sources (3fhl), containing 1556 objects characterized in the 10 gev-2 tev energy range. the sensitivity and angula... | 3fhl: the third catalog of hard fermi-lat sources |
the origin of ultrahigh-energy cosmic rays (uhecrs) is a half-century-old enigma1. the mystery has been deepened by an intriguing coincidence: over ten orders of magnitude in energy, the energy generation rates of uhecrs, pev neutrinos and isotropic sub-tev γ-rays are comparable, which hints at a grand unified picture2... | linking high-energy cosmic particles by black-hole jets embedded in large-scale structures |
the question of whether cosmic microwave background (cmb) temperature and polarization data from planck favor a spatially closed universe with curvature parameter ωk < 0 has been the subject of recent intense discussions. attempts to break the geometrical degeneracy combining planck data with external data sets such... | eppur è piatto? the cosmic chronometers take on spatial curvature and cosmic concordance |
most of the celestial γ rays detected by the large area telescope (lat) on board the fermi gamma-ray space telescope originate from the interstellar medium when energetic cosmic rays interact with interstellar nucleons and photons. conventional point-source and extended-source studies rely on the modeling of this diffu... | development of the model of galactic interstellar emission for standard point-source analysis of fermi large area telescope data |
the tension between early and late universe probes of the hubble constant has motivated various new flrw cosmologies. here, we reanalyse the hubble tension with a recent age of the universe constraint. this allows us to restrict attention to matter and a dark energy sector that we treat without assuming a specific mode... | does hubble tension signal a breakdown in flrw cosmology? |
recent pulsar timing data reported by the nanograv collaboration may indicate the existence of a stochastic gravitational wave background around f ∼10-8 hz. we explore a possibility to generate such low-frequency gravitational waves from a dark sector phase transition. assuming that the dark sector is completely decoup... | gravitational waves and dark radiation from dark phase transition: connecting nanograv pulsar timing data and hubble tension |
we derive a set of no-go theorems and yes-go examples for the parity-odd primordial trispectrum of curvature perturbations. we work at tree-level in the decoupling limit of the effective field theory of inflation and assume scale invariance and a bunch-davies vacuum. we show that the parity-odd scalar trispectrum vanis... | parity violation in the scalar trispectrum: no-go theorems and yes-go examples |
we present a dedicated complementarity study of gravitational wave and collider measurements of the simplest extension of the higgs sector: the singlet scalar augmented standard model. we study the following issues: ( i) the electroweak phase transition patterns admitted by the model, and the proportion of parameter sp... | collider and gravitational wave complementarity in exploring the singlet extension of the standard model |
a model of cosmological inflation is proposed in which field space is a hyperbolic plane. the inflaton never slow-rolls, and instead orbits the bottom of the potential, buoyed by a centrifugal force. though initial velocities redshift away during inflation, in negatively curved spaces angular momentum naturally starts ... | hyperbolic inflation |
we search for evidence of parity-violating physics in the planck 2018 polarization data and report on a new measurement of the cosmic birefringence angle β . the previous measurements are limited by the systematic uncertainty in the absolute polarization angles of the planck detectors. we mitigate this systematic uncer... | new extraction of the cosmic birefringence from the planck 2018 polarization data |
we present the first ge-based constraints on sub-mev /c2 dark matter (dm) particles interacting with electrons using a 33.4 g ge cryogenic detector with a 0.53 electron-hole pair (rms) resolution, operated underground at the laboratoire souterrain de modane. competitive constraints are set on the dm-electron scattering... | first germanium-based constraints on sub-mev dark matter with the edelweiss experiment |
inflation is the leading theory of the first instant of the universe. inflation, which postulates that the universe underwent a period of rapid expansion an instant after its birth, provides convincing explanation for cosmological observations. recent advancements in detector technology have opened opportunities to exp... | the litebird satellite mission: sub-kelvin instrument |
there has been growing interest in $f(q)$ gravity, which has led to significant advancements in the field. however, it is important to note that most studies in this area were based on the coincident gauge, thus overlooking the impact of the connection degrees of freedom. in this work, we pay special attention to the c... | cosmological teleparallel perturbations |
we present early results regarding the morphological and structural properties of galaxies seen with the james webb space telescope (jwst) at z > 3 in the early release observations toward the smacs 0723 cluster field. using jwst we investigate, for the first time, the optical morphologies of a significant number of... | panic! at the disks: first rest-frame optical observations of galaxy structure at z > 3 with jwst in the smacs 0723 field |
within the lambda cold dark matter (λcdm) model, measurements from recent cosmic microwave background (cmb) and weak lensing (wl) surveys have uncovered a ~3σ disagreement in the inferred value of the parameter $s_8 \equiv \sigma _8\sqrt{\omega _\mathrm{ m}/0.3}$, quantifying the amplitude of late-time matter fluctuati... | arbitrating the s8 discrepancy with growth rate measurements from redshift-space distortions |
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