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A Measurement of the Cosmic Microwave Background Damping Tail from the
2500-square-degree SPT-SZ survey: We present a measurement of the cosmic microwave background (CMB) temperature
power spectrum using data from the recently completed South Pole Telescope
Sunyaev-Zel'dovich (SPT-SZ) survey. This measurement is made... | Epoch of reionization parameter estimation with the 21-cm bispectrum: We present the first application of the isosceles bispectrum to MCMC
parameter inference from the cosmic 21-cm signal. We extend the MCMC sampler
21cmMC to use the fast bispectrum code, BiFFT, when computing the likelihood.
We create mock 1000h obser... |
The Spitzer/IRAC view of black hole - bulge scaling relations: We present a mid-IR investigation of the scaling relations between
supermassive black hole masses (MBH) and the structural parameters of the host
spheroids in local galaxies. The work is based on two-dimensional bulge-disk
decompositions of Spitzer/IRAC 3.6... | Reheating in 3-form inflation: We consider the 3-form field, which has been considered as a candidate for
realizing inflation, coupled to a scalar field which models the relativistic
matter particles produced during the reheating epoch. We have investigated the
stability conditions for this theory and found that introd... |
Interplay of CMB Temperature, Space Curvature, and Expansion Rate
Parameters: The cosmic microwave background (CMB) temperature, $T$, surely the most
precisely measured cosmological parameter, has been inferred from {\it local}
measurements of the blackbody spectrum to an exquisite precision of 1 part in
$\sim 4700$.... | Combining cluster number counts and galaxy clustering: The abundance of clusters and the clustering of galaxies are two of the
important cosmological probes for current and future large scale surveys of
galaxies, such as the Dark Energy Survey. In order to combine them one has to
account for the fact that they are not ... |
Backreaction in late-time cosmology: We review the effect of the formation of nonlinear structures on the
expansion rate, spatial curvature and light propagation in the universe,
focusing on the possibility that it could explain cosmological observations
without the introduction of dark energy or modified gravity. We c... | Mass bias and cosmological constraints from Planck cluster clustering: We analysed the 3D clustering of the Planck sample of Sunyaev-Zeldovich (SZ)
selected galaxy clusters, focusing on the redshift-space two-point correlation
function (2PCF). We compared our measurements to theoretical predictions of the
standard $\La... |
RAY-RAMSES: a code for ray tracing on the fly in N-body simulations: We present a ray tracing code to compute integrated cosmological observables
on the fly in AMR N-body simulations. Unlike conventional ray tracing
techniques, our code takes full advantage of the time and spatial resolution
attained by the N-body simu... | Accurate calculations of the WIMP halo around the Sun and prospects for
gamma ray detection: Weakly interacting massive particles (WIMPs) can be captured by heavenly
objects, like the Sun. Under the process of being captured by the Sun, they
will build up a population of WIMPs around it, that will eventually sink to ... |
Updating the MACHO fraction of the Milky Way dark halo with improved
mass models: Recent interest in primordial black holes as a possible dark matter candidate
has motivated the reanalysis of previous methods for constraining massive
astrophysical compact objects in the Milky Way halo and beyond. In order to
derive t... | Testing DARKexp against energy and density distributions of
Millennium-II halos: We test the DARKexp model for relaxed, self-gravitating, collisionless
systems against equilibrium dark matter halos from the Millennium-II
simulation. While limited tests of DARKexp against simulations and observations
have been carried... |
Optical Ring Cavity Search for Axion Dark Matter: We propose a novel experiment to search for axion dark matter which
differentiates the phase velocities of the left and right-handed polarized
photons. Our optical cavity measures the difference of the resonant frequencies
between two circular-polarizations of the laser... | Transients from initial conditions based on Lagrangian perturbation
theory in $N$-body simulations II: the effect of the transverse mode: We study the initial conditions for cosmological $N$-body simulations for
precision cosmology. In general, Zel'dovich approximation has been applied for
the initial conditions of $... |
Cosmic Recombination in the Presence of Primordial Magnetic Fields: Primordial magnetic fields (PMFs) may explain observations of magnetic fields
on extragalactic scales. They are most cleanly constrained by observations of
details of the cosmic microwave background radiation (CMB) Their effects on
cosmic recombination... | Parity-odd correlators of diffuse gamma rays and intergalactic magnetic
fields: We develop the connection between intergalactic helical magnetic fields and
parity odd signatures in the diffuse gamma ray sky. We find that the location
and the amplitude of a peak in a parity odd correlator, $Q(R)$, can be used to
infer... |
What X-ray source counts can tell about large-scale matter distribution: Sources generating most of the X-ray background (XRB) are dispersed over a
wide range of redshifts. Thus, statistical characteristics of the source
distribution carry information on matter distribution on very large scales. We
test the possibility... | Radio galaxy feedback in X-ray selected groups from COSMOS: the effect
on the ICM: We quantify the importance of the mechanical energy released by
radio-galaxies inside galaxy groups. We use scaling relations to estimate the
mechanical energy released by 16 radio-AGN located inside X-ray detected galaxy
groups in the... |
Radio and X-ray properties of submillimeter galaxies in the A2125 field: We present the radio and X-ray properties of 1.2 mm MAMBO source candidates
in a 1600 sq. arcmin field centered on the Abell 2125 galaxy cluster at
z=0.247. The brightest, non-synchrotron mm source candidate in the field has a
photometric redshift... | A Standard Ruler at Cosmic Dawn: The matter in our Universe comes in two flavors: dark and baryonic. Of these,
only the latter couples to photons, giving rise to the well-known baryon
acoustic oscillations and, in the process, generating supersonic relative
velocities between dark matter and baryons. These velocities--... |
The Emission Line Properties of Gravitationally-lensed 1.5 < z < 5
Galaxies: We present and analyse near-infrared spectroscopy for a sample of 28
gravitationally- lensed star-forming galaxies in the redshift range 1.5 < z <
5, observed mostly with the Keck II telescope. With typical magnifications of
~1.5-4 magnitude... | A black box for dark sector physics: Predicting dark matter annihilation
feedback with conditional GANs: Traditionally, incorporating additional physics into existing cosmological
simulations requires re-running the cosmological simulation code, which can be
computationally expensive. We show that conditional Generat... |
A Detailed Study of the Lobes of Eleven Powerful Radio Galaxies: Radio lobes of a sample of eleven very powerful classical double radio
galaxies were studied. Each source was rotated so that the symmetry axis of the
source was horizontal, and vertical cross-sectional cuts were taken across the
source at intervals of on... | Energetic constraints to chemo-photometric evolution of spiral galaxies: The problem of chemo-photometric evolution of late-type galaxies is dealt
with relying on prime physical arguments of energetic self-consistency between
chemical enhancement of galaxy mass, through nuclear processing inside stars,
and luminosity e... |
Artificial Neural Network Spectral Light Curve Template for Type Ia
Supernovae and its Cosmological Constraints: The spectral energy distribution (SED) sequence for type Ia supernovae (SN
Ia) is modeled by an artificial neural network. The SN Ia luminosity is
characterized as a function of phase, wavelength, a color ... | Long Term Monitoring of the Dynamics and Particle Acceleration of Knots
in the Jet of Centaurus A: We present new and archival multi-frequency radio and X-ray data for
Centaurus A obtained over almost 20 years at the VLA and with Chandra, with
which we measure the X-ray and radio spectral indices of jet knots, flux
d... |
Instabilities in neutrino systems induced by interactions with scalars: If there are scalar particles of small or moderate mass coupled very weakly
to Dirac neutrinos, in a minimal way, then neutrino-anti-neutrino clouds of
sufficient number density can experience an instability in which helicities are
suddenly reverse... | SDSS J094604.90+183541.8: A Gravitationally Lensed Quasar at z=4.8: We report the discovery of a gravitationally lensed quasar identified
serendipitously in the Sloan Digital Sky Survey (SDSS). The object, SDSS
J094604.90+183541.8, was initially targeted for spectroscopy as a luminous red
galaxy, but the SDSS spectrum ... |
Dependences of Type Ia Supernovae Lightcurve Parameters on the Host
Galaxy Star Formation Rate and Metallicity: We present the dependences of the properties of type Ia Supernovae (SNe Ia)
on their host galaxies by analyzing the multi-band lightcurves of 118
spectroscopically confirmed SNe Ia observed by the Sloan Dig... | The Carnegie Hubble Program: The Infrared Leavitt Law in IC 1613: We have observed the dwarf galaxy IC 1613, at multiple epochs in the
mid--infrared using Spitzer and contemporaneously in the near--infrared using
the new FourStar near-IR camera on Magellan. We have constructed Cepheid
period--luminosity relations in th... |
Is a symmetric matter-antimatter universe excluded?: We consider a non-standard cosmological model in which the universe contains
as much matter as antimatter on large scales and presents a local baryon
asymmetry. A key ingredient in our approach is that the baryon density
distribution follows Gaussian fluctuations aro... | Cosmological structure formation in complex scalar field dark matter
versus real ultralight axions: a comparative study using CLASS: (abridged) We continue the study of $\Lambda$SFDM cosmologies, which differ
from $\Lambda$CDM in that CDM is replaced by scalar field dark matter (SFDM) by
calculating the evolution of ... |
Minor merger-induced cold fronts in Abell 2142 and RXJ1720.1+2638: We present evidence for the existence of substructure in the "relaxed
appearing" cold front clusters Abell 2142 and RXJ1720.1+2638. The detection of
these substructures was made possible by comprehensive multi-object optical
spectroscopy obtained with t... | Can primordial parity violation explain the observed cosmic
birefringence?: Recently, the cross-correlation between $E$- and $B$-mode polarization of the
cosmic microwave background (CMB), which is well explained by cosmic
birefringence with rotation angle $\beta\approx 0.3$ deg, has been found in CMB
polarization da... |
Consistency Relation and Non-Gaussianity in a Galileon Inflation: We study a particular Galileon inflation in the light of Planck2015
observational data in order to constraint the model parameter space. We study
the spectrum of the primordial modes of the density perturbations by expanding
the action up to the second o... | Effect of Population III Multiplicity on Dark Star Formation: We numerically study the mutual interaction between dark matter (DM) and
Population III (Pop III) stellar systems in order to explore the possibility of
Pop III dark stars within this physical scenario. We perform a cosmological
simulation, initialized at z ... |
The Chemical Evolution of Narrow Emission Line Galaxies: the Key to
their Formation Processes: Using the largest sample of narrow emission line galaxies available so far,
we show that their spectral characteristics are correlated with different
physical parameters, like the chemical abundances, the morphologies, the ... | Scalar instabilities in bimetric gravity: The Vainshtein mechanism and
structure formation: We investigate the observational consequences of scalar instabilities in
bimetric theory, under the assumption that the Vainshtein mechanism restores
general relativity within a certain distance from gravitational sources. We
... |
A new way to test the Cosmological Principle: measuring our peculiar
velocity and the large scale anisotropy independently: We present a novel approach to disentangle two key contributions to the
largest-scale anisotropy of the galaxy distribution: (i) the intrinsic dipole
due to clustering and anisotropic geometry, ... | Cosmological simulations of the same spiral galaxy: connecting the dark
matter distribution of the host halo with the subgrid baryonic physics: The role of baryonic physics, star formation, and stellar feedback, in
shaping the galaxies and their host halos is an evolving topic. The dark matter
aspects are illustrated... |
Baryon Acoustic Oscillations reconstruction with pixels: Gravitational non-linear evolution induces a shift in the position of the
baryon acoustic oscillations (BAO) peak together with a damping and broadening
of its shape that bias and degrades the accuracy with which the position of the
peak can be determined. BAO re... | The possible resolution of Boltzmann brains problem in phantom cosmology: We consider the well-known Boltzmann brains problem in frames of simple
phantom energy models with little rip and big rip singularity. It is showed
that these models (i) satisfy to observational data and (ii) may be free from
Boltzmann brains pro... |
Combining Full-Shape and BAO Analyses of Galaxy Power Spectra: A 1.6%
CMB-independent constraint on H0: 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). Geom... | Cosmological evolution of Witten superconducting string networks: We consider the evolution of current-carrying cosmic string networks
described by the charge-velocity-dependent one scale (CVOS) model beyond the
linear equation of state regime, specifically focusing on the Witten
superconducting model. We find that, ge... |
Molecular Gas Evolution across a Spiral Arm in M 51: We present sensitive and high angular resolution CO(1-0) data obtained by the
Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations
toward the nearby grand-design spiral galaxy M 51. The angular resolution of
0.7" corresponds to 30 pc, which i... | GW190425, GW190521 and GW190814: Three candidate mergers of primordial
black holes from the QCD epoch: The two recent gravitational-wave events GW190425 and GW190814 from the third
observing run of LIGO/Virgo have both a companion which is unexpected if
originated from a neutron star or a stellar black hole, with mas... |
Stellar population and kinematics of NGC404: NGC404 is a nearly face-on nearby low-luminosity lenticular galaxy. Probing
its characteristics provides a wealth of information on the details of possible
evolution processes of dS0 galaxies which may not be possible in other, more
distant objects. In order to study its kin... | New constraints on the distance duality relation from the local data: The cosmic distance duality relation (DDR), which connects the angular
diameter distance and luminosity distance through a simple formula
$D_A(z)(1+z)^2/D_L(z)\equiv1$, is an important relation in cosmology.
Therefore, testing the validity of DDR is ... |
3D-structure of the Canes Venatici I Cloud: We present the improved distance moduli of 30 galaxies in the Canes Venatici
I Cloud using advanced Tip of Red Giant Branch (TRGB) method (Makarov et.al.
2006). The method was determined for accurate estimation of the distances even
if TRGB situated near photometric limit. Th... | Comment on cluster analysis of radio loops in CMB data: A recent article (Liu et al. 2014) looks for evidence in the WMAP internal
linear combination map (ILC) of unmodeled emission from the galactic radio loop
known as Loop I. The statistically strongest result comes from a cluster
analysis that tests whether the "hot... |
The largest structure of the Universe, defined by Gamma-Ray Bursts: Research over the past three decades has revolutionized the field of
cosmology while supporting the standard cosmological model. However, the
cosmological principle of Universal homogeneity and isotropy has always been in
question, since structures as ... | The dominant role of mergers in the size evolution of massive early-type
galaxies since z ~ 1: In this paper we measure the merger fraction and rate, both minor and major,
of massive early-type galaxies (M_star >= 10^11 M_Sun) in the COSMOS field, and
study their role in mass and size evolution. We use the 30-band ph... |
CMB Polarization Systematics, Cosmological Birefringence and the
Gravitational Waves Background: Cosmic Microwave Background experiments must achieve very accurate
calibration of their polarization reference frame to avoid biasing the
cosmological parameters. In particular, a wrong or inaccurate calibration might
mim... | Tests of Chameleon Gravity: 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 mea... |
The Djorgovski-Gurzadyan dark energy integral equation and the Hubble
diagram: We consider the observational aspects of the value of dark energy density
from quantum vacuum fluctuations based initially on the Gurzadyan-Xue model. We
reduce the Djorgovski-Gurzadyan integral equation to a differential equation
for the ... | The Aemulus Project I: Numerical Simulations for Precision Cosmology: The rapidly growing statistical precision of galaxy surveys has lead to a
need for ever-more precise predictions of the observables used to constrain
cosmological and galaxy formation models. The primary avenue through which such
predictions will be ... |
The impact and response of minihalos and the inter-halo medium on cosmic
reionization: An ionization front (I-front) that propagates through an inhomogeneous medium
is slowed down by self-shielding and recombinations. We perform cosmological
radiation hydrodynamics simulations of the I-front propagation during the ep... | Heating the IGM by X-rays from Population III Binaries in High Redshift
Galaxies: Due to their long mean free path, X-rays are expected to have an important
impact on cosmic reionization by heating and ionizing the IGM on large scales,
especially after simulations have suggested that Population III stars may form
in ... |
A new recipe for $Λ$CDM: It is well known that a canonical scalar field is able to describe either
dark matter or dark energy but not both. We demonstrate that a non-canonical
scalar field can describe both dark matter and dark energy within a unified
setting. We consider the simplest extension of the canonical Lagrang... | Bayesian analysis for a class of $α$-attractor inflationary models: We perform a Bayesian study of a generalization of the basic
$\alpha$-attractor T model given by the potential
$V(\phi)=V_0\left[1-\text{sech}^{p}\left(\phi/\sqrt{6\alpha}M_{pl}\right)\right]$
where $\phi$ is the inflaton field and the parameter $\alph... |
Anisotropic dark energy and ellipsoidal universe: A cosmological model with anisotropic dark energy is analyzed. The amount of
deviation from isotropy of the equation of state of dark energy, the skewness
\delta, generates an anisotropization of the large-scale geometry of the
Universe, quantifiable by means of the act... | Signs of Interacting Vacuum and Dark Matter in the Universe: We consider the impact of dynamical dark energy (DDE) in the possible
solution of the existing tensions in the $\Lambda$CDM. We test both interacting
and non-interacting DE models with dark matter (DM). Among the former, the
running vacuum model (RVM) interac... |
Describing variations of the Fisher-matrix across parameter space: Forecasts in cosmology, both with Monte-Carlo Markov-chain methods and with
the Fisher matrix formalism, depend on the choice of the fiducial model because
both the signal strength of any observable as well as the model nonlinearities
linking observable... | Lensing smoothing of BAO wiggles: We study non-perturbatively the effect of the deflection angle on the BAO
wiggles of the matter power spectrum in real space. We show that from redshift
z~2 this introduces a dispersion of roughly 1 Mpc at BAO scale, which
corresponds approximately to a 1% effect. The lensing effect in... |
First CMB Constraints on Direction-Dependent Cosmological Birefringence
from WMAP-7: A Chern-Simons coupling of a new scalar field to electromagnetism may give
rise to cosmological birefringence, a rotation of the linear polarization of
electromagnetic waves as they propagate over cosmological distances. Prior work
h... | Constraints on neutrino mass from Cosmic Microwave Background and Large
Scale Structure: Our tightest upper limit on the sum of neutrino mass eigenvalues $M_\nu$
comes from cosmological observations that will improve substantially in the
near future, enabling a detection. The combination of the Baryon Acoustic
Oscill... |
Searching for dark matter annihilation from individual halos:
uncertainties, scatter and signal-to-noise ratios: Individual extragalactic dark matter halos, such as those associated with
nearby galaxies and galaxy clusters, are promising targets for searches for
gamma-rays from dark matter annihilation. We review the... | Bispectrum Supersample Covariance: Modes with wavelengths larger than the survey window can have significant
impact on the covariance within the survey window. The supersample covariance
has been recognized as an important source of covariance for the power spectrum
on small scales, and it can potentially be important ... |
Mass Function Predictions Beyond LCDM: The mass distribution of halos, as specified by the halo mass function, is a
key input for several cosmological probes. The sizes of $N$-body simulations
are now such that, for the most part, results need no longer be
statistics-limited, but are still subject to various systematic... | Results from EDGES High-Band: III. New Constraints on Parameters of the
Early Universe: We present new constraints on parameters of cosmic dawn and the epoch of
reionization derived from the EDGES High-Band spectrum ($90-190$ MHz). The
parameters are probed by evaluating global $21$ cm signals generated with the
rece... |
Lepton Flavour Asymmetries and the Mass Spectrum of Primordial Black
Holes: We study the influence of lepton flavour asymmetries on the formation and the
mass spectrum of primordial black holes. We estimate the detectability of their
mergers with LIGO/Virgo and show that the currently published gravitational
wave eve... | Direct Detections of Young Stars in Nearby Elliptical Galaxies: Small amounts of star formation in elliptical galaxies are suggested by
several results: surprisingly young ages from optical line indices, cooling
X-ray gas, and mid-IR dust emission. Such star formation has previously been
difficult to directly detect, b... |
IDCS J1426.5+3508: Sunyaev-Zel'dovich Measurement of a Massive
IR-selected Cluster at z=1.75: We report 31 GHz CARMA observations of IDCS J1426.5+3508, an
infrared-selected galaxy cluster at z = 1.75. A Sunyaev-Zel'dovich decrement is
detected towards this cluster, indicating a total mass of M200 = (4.3 +/- 1.1)
x 10... | Principal Components of CMB non-Gaussianity: The skew-spectrum statistic introduced by Munshi & Heavens (2010) has
recently been used in studies of non-Gaussianity from diverse cosmological data
sets including the detection of primary and secondary non-Gaussianity of Cosmic
Microwave Background (CMB) radiation. Extendi... |
Future constraints on the gravitational slip with the mass profiles of
galaxy clusters: The gravitational slip parameter is an important discriminator between large
classes of gravity theories at cosmological and astrophysical scales. In this
work we use a combination of simulated information of galaxy cluster mass
p... | Influence of the Environment on PAH Emission in Star-Forming Regions: We investigate the emission properties of polycyclic aromatic hydrocarbons
(PAHs) in various metallicity environments with the Infrared Spectrograph on
board Spitzer. Local giant HII regions are used as references as they enable
access to the distinc... |
Neutral Hydrogen Tully Fisher Relation: The case for Newtonian Gravity: Intrinsic luminosities are related to rotation velocities of disk galaxies by
Tully Fisher (TF) relations. The Baryonic TF (BTF) relation has recently been
explained with Dark Matter and Newtonian Gravity as well as Modified Newtonian
Dynamics (MON... | Implications of hydrodynamical simulations for the interpretation of
direct dark matter searches: In recent years, realistic hydrodynamical simulations of galaxies like the
Milky Way have become available, enabling a reliable estimate of the dark
matter density and velocity distribution in the Solar neighborhood. We ... |
Gravitational waves from cosmological phase transitions: I discuss the generation of a stochastic background of gravitational waves
during a first order phase transition. I present simple general arguments which
explain the main features of the gravitational wave spectrum like the $k^3$
power law growth on large scales... | Planck Early Results XXVI: Detection with Planck and confirmation by
XMM-Newton of PLCK G266.6-27.3, an exceptionally X-ray luminous and massive
galaxy cluster at z~1: We present first results on PLCK G266.6-27.3, a galaxy cluster candidate
detected at a signal-to-noise ratio of 5 in the Planck All Sky survey. An
X... |
Cosmic Magnetic Fields: from Stars and Galaxies to the Primordial
Universe: Most of the baryonic matter in the Universe is permeated by magnetic fields
which affect many, if not most, of astrophysical phenomena both, in compact
sources and in diffuse gas. Recent years have been marked by a worldwide surge
of interest... | Microwave and radio emission of dusty star-forming galaxies: Implication
for the cosmic radio background: We use the most up-to-date cosmological evolution models of star-forming (SF)
galaxies and radio sources to compute the extragalactic number counts and the
cosmic background from 408MHz to 12THz. The model of SF ... |
The Influence of AGN Feedback on Galaxy Cluster Observables: Galaxy clusters are valuable cosmological probes. However, cluster mass
estimates rely on observable quantities that are affected by complicated
baryonic physics in the intracluster medium (ICM), including feedback from
active galactic nuclei (AGN). Cosmologi... | Extracting key information from spectroscopic galaxy surveys: We develop a novel method to extract key cosmological information, which is
primarily carried by the baryon acoustic oscillations and redshift space
distortions, from spectroscopic galaxy surveys based on a joint principal
component analysis (PCA) and massiv... |
Metallicity effects in the spectral classification of O-type stars.
Theoretical consideration: Based on an exteded grid of NLTE, line blanketed model atmospheres with
stellar winds as calculated by means of FASTWIND, we have investigated the
change in the strengths of strategic Helium transitions in the optical as
ca... | Prospects for Delensing the Cosmic Microwave Background for Studying
Inflation: A detection of excess cosmic microwave background (CMB) B-mode polarization
on large scales allows the possibility of measuring not only the amplitude of
these fluctuations but also their scale dependence, which can be parametrized
as the... |
Photometric Redshifts for Next-Generation Surveys: Photometric redshifts are essential in studies of both galaxy evolution and
cosmology, as they enable analyses of objects too numerous or faint for
spectroscopy. The Rubin Observatory, Euclid, and Roman Space Telescope will
soon provide a new generation of imaging surv... | SZ Scaling Relations of Galaxy Groups and Clusters Near the North
Ecliptic Pole: SZ scaling relations have been used to test the self-similar prediction for
massive galaxy clusters, but little attention has been given to individual
galaxy groups. We investigate the scaling relations of galaxy groups and
clusters near... |
A Groundbased Imaging Study of Galaxies Causing DLA, subDLA, and LLS
Absorption in Quasar Spectra: We present results from a search for galaxies that give rise to damped Lyman
alpha (DLA), subDLA, and Lyman limit system (LLS) absorption at redshifts 0.1
~< z ~< 1 in the spectra of background quasars. The sample was f... | Testing the Cosmic Anisotropy with Supernovae Data: Hemisphere
Comparison and Dipole Fitting: The cosmological principle is one of the cornerstones in modern cosmology. It
assumes that the universe is homogeneous and isotropic on cosmic scales. Both
the homogeneity and the isotropy of the universe should be tested ca... |
The invariant Twist of Magnetic Fields in the Relativistic Jets of
Active Galactic Nuclei: The origin of cosmic magnetic (B) fields remains an open question. It is
generally believed that very weak primordial B fields are amplified by dynamo
processes, but it appears unlikely that the amplification proceeds fast enou... | Mass and magnification maps for the Hubble Space Telescope Frontier
Fields clusters: implications for high redshift studies: Extending over three Hubble Space Telescope (HST) cycles, the Hubble Frontier
Fields (HFF) initiative constitutes the largest commitment ever of HST time to
the exploration of the distant Unive... |
Thermal Friction as a Solution to the Hubble and Large-Scale Structure
Tensions: Thermal friction offers a promising solution to the Hubble and the
large-scale structure (LSS) tensions. This additional friction acts on a scalar
field in the early universe and extracts its energy density into dark
radiation, the cumul... | Rhapsody-G simulations I: the cool cores, hot gas and stellar content of
massive galaxy clusters: We present the Rhapsody-G suite of cosmological hydrodynamic AMR zoom
simulations of ten massive galaxy clusters at the $M_{\rm vir}\sim10^{15}\,{\rm
M}_\odot$ scale. These simulations include cooling and sub-resolution ... |
TeV blazars and their distance: Recently, a new method to constrain the distance of blazars with unknown
redshift using combined observations in the GeV and TeV regimes has been
developed, with the underlying assumption that the Very High Energy (VHE)
spectrum corrected for the absorption of TeV photons by the Extragal... | Galaxy Alignments in Very X-ray Luminous Clusters at z>0.5: We present the results of a search for galaxy alignments in 12 galaxy
clusters at z>0.5, a statistically complete subset of the very X-ray luminous
clusters from the MAssive Cluster Survey (MACS). Using high-quality images
taken with the Hubble Space Telescope... |
Detection of a Companion Lens Galaxy using the Mid-infrared Flux Ratios
of the Gravitationally Lensed Quasar H1413+117: We present the first resolved mid-IR (11 micron) observations of the
four-image quasar lens H1413+117 using the Michelle camera on Gemini North. All
previous observations (optical, near-IR, and radi... | Assembly Bias & Redshift-Space Distortions: Impact on cluster dynamics
tests of general relativity: The redshift-space distortion (RSD) of galaxies surrounding massive clusters
is emerging as a promising testbed for theories of modified gravity.
Conventional applications of this method rely upon the assumption that t... |
Imprints of decaying dark matter on cosmic voids: The Standard Cosmological Model assumes that more than 85\% of matter is in
the form of collisionless and pressureless dark matter. Unstable decaying dark
matter has been proposed in the literature as an extension to the standard cold
dark matter model. In this paper we... | The influence of mergers on the cluster temperature function and
cosmological parameters derived from it: We develop a parameter-free analytic model to include the effects of mergers
into the theoretical modelling of the X-ray temperature function of galaxy
clusters. We include this description into our model for the... |
Gravothermal Catastrophe with a Cosmological Constant: We investigate the effect of a cosmological constant on the gravothermal
catastrophe in the Newtonian limit. A negative cosmological constant acts as a
thermodynamic `destabilizer'. The Antonov radius gets smaller and the
instability occurs, not only for negative b... | A jet-driven dynamo (JEDD) from jets-inflated bubbles in cooling flows: I suggest that the main process that amplifies magnetic fields in cooling
flows in clusters and group of galaxies is a jet-driven dynamo (JEDD). The main
processes that are behind the JEDD is the turbulence that is formed by the many
vortices forme... |
The Cosmological Parameters (2019): This is a review article for The Review of Particle Physics 2020 (aka the
Particle Data Book). It forms a compact review of knowledge of the cosmological
parameters at the end of 2019. Topics included are Parametrizing the Universe;
Extensions to the standard model; Probes; Bringing ... | Galaxy and Mass Assembly (GAMA): Colour and luminosity dependent
clustering from calibrated photometric redshifts: We measure the two-point angular correlation function of a sample of
4,289,223 galaxies with r < 19.4 mag from the Sloan Digital Sky Survey as a
function of photometric redshift, absolute magnitude and c... |
The Problem of Inertia in Friedmann Universes: In this paper we study the origin of inertia in a curved spacetime,
particularly the spatially flat, open and closed Friedmann universes. This is
done using Sciama's law of inertial induction, which is based on Mach's
principle, and expresses the analogy between the retard... | Warm dark matter does not do better than cold dark matter in solving
small-scale inconsistencies: Over the last decade, warm dark matter (WDM) has been repeatedly proposed as
an alternative scenario to the standard cold dark matter (CDM) one, potentially
resolving several disagreements between the CDM model and obser... |
The Layzer-Irvine Equation for Scalar-Tensor Theories: A Test of
Modified Gravity N-body Simulations: The Layzer-Irvine equation describes energy conservation for a pressure less
fluid interacting though quasi-Newtonian gravity in an expanding Universe. We
here derive a Layzer-Irvine equation for scalar field theorie... | CMB EB and TB cross-spectrum estimation via pseudo-spectrum techniques: We discuss methods for estimating EB and TB spectra of the Cosmic Microwave
Background anisotropy maps covering limited sky area. Such odd-parity
correlations are expected to vanish whenever parity is not broken. As this is
indeed the case in the s... |
Gravitational Heating Helps Make Massive Galaxies Red and Dead: We study the thermal formation history of four simulated galaxies that were
shown in Naab et al. (2007) to reproduce a number of observed properties of
elliptical galaxies. The temperature of the gas in the galaxies is steadily
increasing with decreasing r... | Lifting the Veil of Dust from NGC 0959: The Importance of a Pixel-Based
2D Extinction Correction: We present the results of a study of the late-type spiral galaxy NGC 0959,
before and after application of the pixel-based dust extinction correction
described in Tamura et al. 2009 (Paper I). Galaxy Evolution Explorer (... |
Parity in Planck full-mission CMB temperature maps: In the standard model of cosmology, Cosmic Microwave Background (CMB) sky is
expected to show no symmetry preferences. Following our previous studies, we
explore the presence of any particular parity preference in the latest
full-mission CMB temperature maps from ESA'... | Debiasing Standard Siren Inference of the Hubble Constant with Marginal
Neural Ratio Estimation: Gravitational wave (GW) standard sirens may resolve the Hubble tension,
provided that standard siren inference of $H_0$ is free from systematic biases.
However, standard sirens from binary neutron star (BNS) mergers suffe... |
The X-ray to optical-UV luminosity ratio of X-ray selected Type 1 AGN in
XMM-COSMOS: We present a study of the X-ray to optical properties of a sample of 545
X-ray selected Type 1 AGN, from the XMM-COSMOS survey, over a wide range of
redshifts ($0.04<\z<4.25$) and X-ray luminosities ($40.6 \leq \Log \Lhard \leq
45.3$... | Dry minor mergers and size evolution of high-z compact massive
early-type galaxies: Recent observations show evidence that high-z (z\sim 2 - 3) early-type
galaxies (ETGs) are more compact than those with comparable mass at z\sim 0.
Such a size evolution is most likely explained by the `Dry Merger Sceanario'.
However,... |
Scaling relations of the slightly self-interacting cold dark matter in
galaxies and clusters: Recent observations in galaxies and clusters indicate dark matter density
profiles exhibit core-like structures which contradict to the numerical
simulation results of collisionless cold dark matter. The idea of
self-interac... | Unfolding the matter distribution using 3-D weak gravitational lensing: Combining redshift and galaxy shape information offers new exciting ways of
exploiting the gravitational lensing effect for studying the large scales of
the cosmos. One application is the three-dimensional reconstruction of the
matter density distr... |
The Redshift and Mass Dependence on the Formation of The Hubble Sequence
at z>1 from CANDELS/UDS: In this paper we present a detailed study of the structures and morphologies
of a sample of 1188 massive galaxies with Mstar>10^10Msun between redshifts
z=1-3 within the Ultra Deep Survey (UDS) region of the Cosmic Assem... | Non-Linearity-Free prediction of the growth-rate $fσ_8$ using
Convolutional Neural Networks: The growth-rate $f\sigma_8(z)$ of the large-scale structure of the Universe
is an important dynamic probe of gravity that can be used to test for
deviations from General Relativity. However, in order for galaxy surveys to
ext... |
Breaking of self-averaging properties and selection effects in the
Luminous Red Galaxies sample: We study the statistical properties of the Luminous Red Galaxies sample from
the Sloan Digital Sky Survey. In particular we test, by determining the
probability density function (PDF) of galaxy (conditional) counts in sph... | Physical Properties, Star Formation, and Active Galactic Nucleus
Activity in Balmer Break Galaxies at 0 < z < 1: We present a spectroscopic study with the derivation of the physical
properties of 37 Balmer break galaxies, which have the necessary lines to
locate them in star-forming-AGN diagnostic diagrams. These gal... |
The abundance of Bullet-groups in LCDM: We estimate the expected distribution of displacements between the two
dominant dark matter (DM) peaks (DM-DM displacements) and between DM and
gaseous baryon peak (DM-gas displacements) in dark matter halos with masses
larger than $10^{13}$ Msun/h. We use as a benchmark the obse... | Chemical Evolution of Dwarf Irregular and Blue Compact Galaxies: Dwarf irregular and blue compact galaxies are very interesting objects since
they are relatively simple and unevolved. We present new models for the
chemical evolution of these galaxies by assuming different regimes of star
formation (bursting and continu... |
Measuring the temperature and profiles of Lyman-$α$ absorbers: The distribution of the absorption line broadening observed in the Ly$\alpha$
forest carries information about the temperature and widths of the filaments in
the intergalactic medium (IGM). In this work, we present and test a new method
for inferring the te... | Do current cosmological observations rule out all Covariant Galileons?: We revisit the cosmology of Covariant Galileon gravity in view of the most
recent cosmological data sets, including weak lensing. As a higher derivative
theory, Covariant Galileon models do not have a $\Lambda$CDM limit and predict
a very different... |
A dynamical mass estimator for high z galaxies based on
spectroastrometry: Galaxy dynamical masses are important physical quantities to constrain galaxy
evolutionary models, especially at high redshifts. However, at z~2 the limited
signal to noise ratio and spatial resolution of the data usually do not allow
spatiall... | The Hidden Mass and Large Spatial Extent of a Poststarburst Galaxy
Outflow: Outflowing winds of multiphase plasma have been proposed to regulate the
buildup of galaxies, but key aspects of these outflows have not been probed
with observations. Using ultraviolet absorption spectroscopy, we show that
"warm-hot" plasma ... |
Large-scale Motions in the Perseus Galaxy Cluster: By combining large-scale mosaics of ROSAT PSPC, XMM-Newton, and Suzaku X-ray
observations, we present evidence for large-scale motions in the intracluster
medium of the nearby, X-ray bright Perseus Cluster. These motions are suggested
by several alternating and interle... | The XXL Survey. XIII. Baryon content of the bright cluster sample: Traditionally, galaxy clusters have been expected to retain all the material
accreted since their formation epoch. For this reason, their matter content
should be representative of the Universe as a whole, and thus their baryon
fraction should be close ... |
Inflaton-driven early dark energy: By arranging the control parameters, we examine whether the mass varying
neutrino model PRD 103, 063540 (2021), enabling one to unify inflation with the
present dark energy, can be used for producing an early dark energy. The model
works in the following way. At early stages of the Bi... | Daily modulation due to channeling in direct dark matter crystalline
detectors: The channeling of the ion recoiling after a collision with a WIMP in direct
dark matter crystalline detectors produces a larger scintillation or ionization
signal than otherwise expected. Channeling is a directional effect which
depends o... |
Reconstruction of cosmological matter perturbations in Modified Gravity: The analysis of perturbative quantities is a powerful tool to distinguish
between different Dark Energy models and gravity theories degenerated at the
background level. In this work, we generalise the integral solution of the
matter density contra... | The Origins of AGN Obscuration: The 'Torus' as a Dynamical, Unstable
Driver of Accretion: Multi-scale simulations have made it possible to follow gas inflows onto
massive black holes (BHs) from galactic scales to the accretion disk. When
sufficient gas is driven towards the BH, gravitational instabilities
generically... |
Small Field models with ACTPol and BICEP3 data -- Likelihood analysis: We perform a Bayesian analysis for small field models of inflation, using the
most recent datasets produced by Planck`18, ACTPol, and BICEP3. We employ
Artificial Neural Networks (ANN) to perform analyses with model coefficients,
instead of their pr... | The impact of line-of-sight structures on measuring $H_0$ with strong
lensing time-delays: Measurements of The Hubble-Lemaitre constant from early- and local-universe
observations show a significant discrepancy. In an attempt to understand the
origin of this mismatch, independent techniques to measure H0 are required... |
Cosmology with kSZ: breaking the optical depth degeneracy with Fast
Radio Bursts: The small-scale cosmic microwave background (CMB) is dominated by
anisotropies from the kinematic Sunyaev-Zeldovich (kSZ) effect, and upcoming
experiments will measure it very precisely, but the optical depth degeneracy
limits the cosmo... | Multi-frequency measurements of the NVSS foreground sources in the
Cosmic Background Imager fields. I. Data release: We present the results of the flux density measurements at 4.85 GHz and 10.45
GHz of a sample of 5998 NVSS radio sources with the Effelsberg 100 m telescope.
The initial motivation was the need to iden... |
Exploring Inflationary Initial State With Large Scale Structure
Observations: We investigate for possible constraints on inflationary initial state from
Large Scale Structure (LSS) observations. Using a model-independent framework,
we build the template for the generic initial state and construct the matter
power spe... | Weak lensing mass modeling bias and the impact of miscentring: Parametric modeling of galaxy cluster density profiles from weak lensing
observations leads to a mass bias, whose detailed understanding is critical in
deriving accurate mass-observable relations for constraining cosmological
models. Drawing from existing m... |
Pattern Speeds of Bars and Spiral Arms From H-alpha Velocity Fields: We have applied the Tremaine-Weinberg method to 10 late-type barred spiral
galaxies using data cubes, in H-alpha emission, from the GHAFAS and FANTOMM
Fabry-Perot spectrometers. We have combined the derived bar (and/or spiral)
pattern speeds with angu... | Cosmological Implications of the Tetron Model of Elementary Particles: Based on a possible solution to the tetron spin problem, a modification of
the standard Big Bang scenario is suggested, where the advent of a spacetime
manifold is connected to the appearance of tetronic bound states. The metric
tensor is constructe... |
Tailoring Strong Lensing Cosmographic Observations: Strong lensing time delay cosmography has excellent complementarity with
other dark energy probes, and will soon have abundant systems detected. We
investigate two issues in the imaging and spectroscopic followup required to
obtain the time delay distance. The first i... | Star formation and environment in clusters up to z~2.2: The dependence of galaxy star formation activity on environment - especially
in clusters - at high redshift is still poorly understood, as illustrated by
the still limited number of z>1.4 clusters on the one hand, and by the still
debated star formation-density re... |
Major Mergers Going Notts: Challenges for Modern Halo Finders: Merging haloes with similar masses (i.e., major mergers) pose significant
challenges for halo finders. We compare five halo finding algorithms' (AHF,
HBT, Rockstar, SubFind, and VELOCIraptor) recovery of halo properties for both
isolated and cosmological ma... | A Simple Analytic Treatment of Linear Growth of Structure with Baryon
Acoustic Oscillations: In linear perturbation theory, all information about the growth of structure
is contained in the Green's function, or equivalently, transfer function. These
functions are generally computed using numerical codes or by phenome... |
Beyond the plane-parallel and Newtonian approach: Wide-angle redshift
distortions and convergence in general relativity: We extend previous analyses of wide-angle correlations in the galaxy power
spectrum in redshift space to include all general relativistic effects. These
general relativistic corrections to the stan... | Kinematics of Arp 270: gas flows, nuclear activity and two regimes of
star formation: We have observed the Arp 270 system (NGC 3395 & NGC 3396) in H{\alpha}
emission using the GH{\alpha}FaS Fabry-Perot spectrometer on the 4.2m William
Herschel Telescope (La Palma). In NGC 3396, which is edge-on to us, we detect
gas i... |
The 6dF Galaxy Survey: z \approx 0 measurement of the growth rate and
sigma_8: We present a detailed analysis of redshift-space distortions in the two-point
correlation function of the 6dF Galaxy Survey (6dFGS). The K-band selected
sub-sample which we employ in this study contains 81971 galaxies distributed
over 1700... | The Stellar Halos of Massive Elliptical Galaxies: We use the Mitchell Spectrograph (formerly VIRUS-P) on the McDonald
Observatory 2.7m Harlan J. Smith Telescope to search for the chemical
signatures of massive elliptical galaxy assembly. The Mitchell Spectrograph is
an integral-field spectrograph with a uniquely wide f... |
The NIKA2 Sunyaev-Zeldovich Large Program: The NIKA2 Guaranteed-Time SZ Large Program (LPSZ) is dedicated to the
high-angular resolution SZ mapping of a representative sample of 45 SZ-selected
galaxy clusters drawn from the catalogues of the Planck satellite, or of the
Atacama Cosmology Telescope. The LPSZ sample spans... | The GALEX Arecibo SDSS Survey. VI. Second Data Release and Updated Gas
Fraction Scaling Relations: We present the second data release from the GALEX Arecibo SDSS Survey (GASS),
an ongoing large Arecibo program to measure the HI properties for an unbiased
sample of ~1000 galaxies with stellar masses greater than 10^10... |
Evidence against Ryskin's model of cosmic acceleration: In this paper I examine how well Ryskin's model of emergent cosmic
acceleration fits several sets of cosmological observations. I find that while
Ryskin's model is somewhat compatible with the standard model of cosmological
acceleration ($\Lambda$CDM) for low reds... | Implicit Priors in Galaxy Cluster Mass and Scaling Relation
Determinations: Deriving the total masses of galaxy clusters from observations of the
intracluster medium (ICM) generally requires some prior information, in
addition to the assumptions of hydrostatic equilibrium and spherical symmetry.
Often, this informati... |
Vector Galileon and inflationary magnetogenesis: Cosmological inflation provides the initial conditions for the structure
formation. However, the origin of large-scale magnetic fields cannot be
addressed in this framework. The key issue for this long-standing problem is
the conformal invariance of the electromagnetic (... | Testing the lognormality of the galaxy and weak lensing convergence
distributions from Dark Energy Survey maps: It is well known that the probability distribution function (PDF) of galaxy
density contrast is approximately lognormal; whether the PDF of mass
fluctuations derived from weak lensing convergence (kappa_WL)... |
Hyper Suprime-Cam Year 3 Results: Measurements of Clustering of
SDSS-BOSS Galaxies, Galaxy-Galaxy Lensing and Cosmic Shear: We use the Sloan Digital Sky Survey (SDSS) BOSS galaxies and their overlap
with approximately 416 sq. degree of deep $grizy$-band imaging from the Subaru
Hyper Suprime-Cam Survey (HSC). We measu... | Gravitational instabilities of isothermal spheres in the presence of a
cosmological constant: Gravitational instabilities of isothermal spheres are studied in the presence
of a positive or negative cosmological constant, in the Newtonian limit. In
gravity, the statistical ensembles are not equivalent. We perform the ... |
Effects of discontinuities of the derivatives of the inflaton potential: We study the effects of a class of features of the inflaton potential,
corresponding to discontinuties in its derivatives. We perform fully numerical
calculations and derive analytical approximations for the curvature
pertubations spectrum and the... | How to generate a significant effective temperature for cold dark
matter, from first principles: I show how to reintroduce velocity dispersion into perturbation theory (PT)
calculations of structure in the Universe, i.e., how to go beyond the
pressureless fluid approximation, starting from first principles. This
addr... |
Ripped ΛCDM: an observational contender to the consensus
cosmological model: Current observations do not rule out the possibility that the Universe might
end up in an abrupt event. Different such scenarios may be explored through
suitable parameterizations of the dark energy and then confronted to
cosmological backgr... | The stellar mass - halo mass relation from galaxy clustering in VUDS: a
high star formation efficiency at z~3: The relation between the galaxy stellar mass M_star and the dark matter halo
mass M_h gives important information on the efficiency in forming stars and
assembling stellar mass in galaxies. We present the st... |
Search for Wormhole Candidates: Accreting Wormholes with Monopole
Magnetic Fields: The existence of even the simplest magnetized wormholes may lead to
observable consequences. In the case where both the wormhole and the magnetic
field around its mouths are static and spherically symmetric, and gas in the
region near ... | Shedding Light on the Galaxy Luminosity Function: From as early as the 1930s, astronomers have tried to quantify the
statistical nature of the evolution and large-scale structure of galaxies by
studying their luminosity distribution as a function of redshift - known as the
galaxy luminosity function (LF). Accurately co... |
Newtonian acceleration scales in spiral galaxies: We revisit the issue of the constancy of the dark matter (DM) and baryonic
Newtonian acceleration scales within the DM scale radius by considering a large
sample of late - type galaxies. We rely on a Markov Chain Monte Carlo (MCMC)
method to estimate the parameters of t... | Lensing reconstruction from a patchwork of polarization maps: The lensing signals involved in CMB polarization maps have already been
measured with ground-based experiments such as SPTpol and POLARBEAR, and would
become important as a probe of cosmological and astrophysical issues in the
near future. Sizes of polarizat... |
Constraining galactic structures of mirror dark matter: The simplest model of mirror sector dark matter maintains exact mirror
symmetry, but has a baryon abundance $\Omega_{b'} = \beta \Omega_b$ and a
suppressed temperature $T' = x T$ in the mirror sector; hence it depends only
on two parameters, $\beta,x$. For suffici... | Signatures of Primordial non-Gaussianities in the Matter Power-Spectrum
and Bispectrum: the Time-RG Approach: We apply the time-renormalization group approach to study the effect of
primordial non-Gaussianities in the non-linear evolution of cosmological dark
matter density perturbations. This method improves the sta... |
Evolution of the u-band luminosity function from redshift 1.2 to 0: We produce and analyse u-band luminosity functions for the red and blue
populations of galaxies using data from the Sloan Digital Sky Survey (SDSS)
u-band Galaxy Survey (uGS) and Deep Evolutionary Exploratory Probe 2 (DEEP2)
survey. From a spectroscopi... | Colour Gradients and the Colour-Magnitude Relation: Different Properties
of Brightest Cluster Galaxies and E/S0 Galaxies in the Sloan Digital Sky
Survey: We examine the colour-magnitude relation of approximately 5000 Brightest
Cluster Galaxies (BCGs) in the Sloan Digital Sky Survey, and compare with
non-BCG E/S0 ga... |
Galaxy Pairs in the Local Group: Current models of galaxy formation predict that galaxy pairs of comparable
magnitudes should become increasingly rare with decreasing luminosity. This
seems at odds with the relatively high frequency of pairings among dwarf
galaxies in the Local Group. We use literature data to show tha... | Discovery and Follow-up of a Nearby Galaxy from the Arecibo Zone of
Avoidance Survey: The Arecibo L-Band Feed Array Zone of Avoidance (ALFA ZOA) Survey has
discovered a nearby galaxy, ALFA ZOA J1952+1428, at a heliocentric velocity of
+279 km s-1. The galaxy was discovered at low Galactic latitude by 21-cm
emission f... |
Primordial black hole formation by vacuum bubbles II: The discoveries of LIGO/Virgo black holes in recent years have revitalized
the study of primordial black holes. In this work, we investigate a mechanism
where primordial black holes are formed by vacuum bubbles that randomly
nucleate during inflation through quantum... | Lyman-Alpha Emitter Galaxies at z ~ 2.8 in the Extended Chandra Deep
Field-South: I. Tracing the Large-Scale Structure via Lyman-Alpha Imaging: We present a narrowband survey with three adjacent filters for z=2.8--2.9
Lyman Alpha Emitter (LAE) galaxies in the Extended Chandra Deep Field South
(ECDFS), along with spec... |
A direct measurement of the linear bias of mid-infrared-selected quasars
at z~1 using cosmic microwave background lensing: We measure the cross-power spectrum of the projected mass density as traced
by the convergence of the cosmic microwave background lensing field from the
South Pole Telescope (SPT) and a sample of... | Measuring cosmic velocities with 21cm intensity mapping and galaxy
redshift survey cross-correlation dipoles: We investigate the feasibility of measuring the effects of peculiar
velocities in large-scale structure using the dipole of the redshift-space
cross-correlation function. We combine number counts of galaxies ... |
Agnostic Stacking of Intergalactic Doublet Absorption: Measuring the
NeVIII Population: We present a blind search for doublet intergalactic metal absorption with a
method dubbed `agnostic stacking'. Using a forward-modelling framework we
combine this with direct detections in the literature to measure the overall
met... | A coupled generalized three-form dark energy model: A coupled dark energy model is considered, in which dark energy is
represented by a generalized three-form field and dark matter by dust. By
assuming the functions $N$ and $I$ in the model's Lagrangian as two power-law
functions of the three-form field, we obtain two ... |
Implications of Planck2015 for inflationary, ekpyrotic and anamorphic
bouncing cosmologies: The results from Planck2015, when combined with earlier observations from
WMAP, ACT, SPT and other experiments, were the first observations to disfavor
the "classic" inflationary paradigm. To satisfy the observational constrai... | Constraining the interaction between dark sectors with future HI
intensity mapping observations: We study a model of interacting dark matter and dark energy, in which the two
components are coupled. We calculate the predictions for the 21-cm intensity
mapping power spectra, and forecast the detectability with future ... |
Detecting the non-Gaussianity of the 21-cm signal during reionisation
with the Wavelet Scattering Transform: Detecting the 21-cm hyperfine transition from neutral hydrogen in the
intergalactic medium is our best probe for understanding the astrophysical
processes driving the Epoch of Reionisation (EoR). The primary m... | Obscuring and feeding supermassive black holes with evolving nuclear
star clusters: Recently, high resolution observations with the help of the near-infrared
adaptive optics integral field spectrograph SINFONI at the VLT proved the
existence of massive and young nuclear star clusters in the centres of a sample
of Sey... |
A point cloud approach to generative modeling for galaxy surveys at the
field level: We introduce a diffusion-based generative model to describe the distribution
of galaxies in our Universe directly as a collection of points in 3-D space
(coordinates) optionally with associated attributes (e.g., velocities and
masses... | Efficient Mass Estimate at the Core of Strong Lensing Galaxy Clusters
Using the Einstein Radius: In the era of large surveys, yielding thousands of galaxy clusters, efficient
mass proxies at all scales are necessary in order to fully utilize clusters as
cosmological probes. At the cores of strong lensing clusters, th... |
Calibrating photometric redshift measurements with the Multi-channel
Imager (MCI) of the China Space Station Telescope (CSST): The China Space Station Telescope (CSST) photometric survey aims to perform a
high spatial resolution (~0.15'') photometric imaging for the targets that
cover a large sky area (~17,500 deg^2)... | Preferred axis in cosmology: The foundation of modern cosmology relies on the so-called cosmological
principle which states an homogeneous and isotropic distribution of matter in
the universe on large scales. However, recent observations, such as the
temperature anisotropy of the cosmic microwave background (CMB) radia... |
On the accuracy and precision of correlation functions and field-level
inference in cosmology: We present a comparative study of the accuracy and precision of correlation
function methods and full-field inference in cosmological data analysis. To do
so, we examine a Bayesian hierarchical model that predicts log-norma... | Primordial perturbations from dilaton-induced gauge fields: We study the primordial scalar and tensor perturbations in inflation scenario
involving a spectator dilaton field. In our setup, the rolling spectator
dilaton causes a tachyonic instability of gauge fields, leading to a copious
production of gauge fields in th... |
One line to run them all: SuperEasy massive neutrino linear response in
$N$-body simulations: We present in this work a novel and yet extremely simple method for
incorporating the effects of massive neutrinos in cosmological $N$-body
simulations. This so-called "SuperEasy linear response" approach is based upon
analy... | A dynamical model for the Taffy galaxies UGC 12914/5: The spectacular head-on collision of the two gas-rich galaxies of the Taffy
system, UGC 12914/15, gives us a unique opportunity to study the consequences
of a direct ISM-ISM collision. To interpret existing multi-wavelength
observations, we made dynamical simulation... |
Modeling assembly bias with machine learning and symbolic regression: Upcoming 21cm surveys will map the spatial distribution of cosmic neutral
hydrogen (HI) over unprecedented volumes. Mock catalogues are needed to fully
exploit the potential of these surveys. Standard techniques employed to create
these mock catalogs... | Rhapsody-G simulations: galaxy clusters as baryonic closed boxes and the
covariance between hot gas and galaxies: Within a sufficiently large cosmic volume, conservation of baryons implies a
simple `closed box' view in which the sum of the baryonic components must equal
a constant fraction of the total enclosed mass.... |
Cosmological parameter inference from galaxy clustering: The effect of
the posterior distribution of the power spectrum: We consider the shape of the posterior distribution to be used when fitting
cosmological models to power spectra measured from galaxy surveys. At very
large scales, Gaussian posterior distributions... | Evidence for a wide range of UV obscuration in z ~ 2 dusty galaxies from
the GOODS-Herschel survey: Dusty galaxies at z ~ 2 span a wide range of relative brightness between
rest-frame mid-infrared (8um) and ultraviolet wavelengths. We attempt to
determine the physical mechanism responsible for this diversity. Dust-ob... |
Cosmological parameter estimation via iterative emulation of likelihoods: The interpretation of cosmological observables requires the use of
increasingly sophisticated theoretical models. Since these models are becoming
computationally very expensive and display non-trivial uncertainties, the use
of standard Bayesian a... | Information theory for fields: A physical field has an infinite number of degrees of freedom since it has a
field value at each location of a continuous space. Therefore, it is impossible
to know a field from finite measurements alone and prior information on the
field is essential for field inference. An information t... |
Synchronize your \textit{chrono-brane}: Testing a variable brane tension
model with strong gravitational lensing: Brane world models have shown to be promising to understand the late cosmic
acceleration, in particular because such acceleration can be naturally derived,
mimicking the dark energy behaviour just with a ... | Impact of Polarized Galactic Foreground Emission on CMB Lensing
Reconstruction and Delensing of B-Modes: Next generation CMB experiments such as CMB-S4 aim at measuring the CMB
lensing potential at sub-percent precision where most of the constraining power
will come from CMB polarization. We investigate the prospects... |
Ultra-compact radio sources and the isotropy and homogeneity of the
Universe: A 2.29 GHz VLBI all-sky survey of ultra-compact radio sources has formed the
basis of a number of cosmological investigations, which examine the
relationship between angular-size and redshift. Here I use a sample of 468 such
sources with 0.... | Patchy Screening of the Cosmic Microwave Background by Inhomogeneous
Reionization: We derive a constraint on patchy screening of the cosmic microwave background
from inhomogeneous reionization, using off-diagonal TB and TT correlations in
WMAP-7 temperature/polarization data. We interpret this as a constraint on the
... |
A template of atmospheric molecular oxygen circularly polarized emission
for CMB experiments: We compute the polarized signal from atmospheric molecular oxygen due to
Zeeman effect in the Earth magnetic field for various sites suitable for CMB
measurements such as South Pole, Dome C (Antarctica) and Atacama desert
(C... | Bias, redshift space distortions and primordial nongaussianity of
nonlinear transformations: application to Lyman alpha forest: On large scales a nonlinear transformation of matter density field can be
viewed as a biased tracer of the density field itself. A nonlinear
transformation also modifies the redshift space d... |
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