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Studying neutral hydrogen structures during the epoch of reionization
using fractal dimensions: Fractal dimensions can be used to characterize the clustering and
lacunarities in density distributions. We use generalized fractal dimensions to
study the neutral hydrogen distribution (HI) during the epoch of reionizatio... | Bound on the graviton mass from Chandra X-ray cluster sample: We present new limits on the graviton mass using a sample of 12 relaxed
galaxy clusters, for which temperature and gas density profiles were derived by
Vikhlinin et al (astro-ph/0507092) using Chandra X-ray observations. These
limits can be converted to a bo... |
How to calculate dark matter direct detection exclusion limits that are
consistent with gamma rays from annihilation in the Milky Way halo: When comparing constraints on the Weakly Interacting Massive Particle (WIMP)
properties from direct and indirect detection experiments it is crucial that
the assumptions made abo... | Lyman alpha Radiative Transfer with Dust: Escape Fractions from
Simulated High-Redshift Galaxies: The Lyman alpha emission line is an essential diagnostic tool for probing
galaxy formation and evolution. Not only is it commonly the strongest
observable line from high-redshift galaxies but from its shape detailed
info... |
The Milky Way rotation curve in Horava - Lifshitz theory: The Horava - Lifshitz (HL) theory has recently attracted a lot of interest as
a viable solution to some quantum gravity related problems and the presence of
an effective cosmological constant able to drive the cosmic speed up. We show
here that, in the weak fiel... | The Non-Linear Fisher Information content of cosmic shear surveys: We quantify the Fisher information content of the cosmic shear survey
two-point function as a function of noise and resolution. The two point
information of dark matter saturates at the trans-linear scale. We investigate
the impact of non-linear non-Gau... |
Standardizing reverberation-measured C IV time-lag quasars, and using
them with standardized Mg II quasars to constrain cosmological parameters: We use 38 C IV quasar (QSO) reverberation-mapped (RM) observations, which
span eight orders of magnitude in luminosity and the redshift range $0.001064
\leq z \leq 3.368$, t... | Chameleon Field Theories: Chameleons are light scalar fields with remarkable properties. Through the
interplay of self-interactions and coupling to matter, chameleon particles have
a mass that depends on the ambient matter density. The manifestation of the
fifth force mediated by chameleons therefore depends sensitivel... |
Discriminating Topology in Galaxy Distributions using Network Analysis: (abridged) The large-scale distribution of galaxies is generally analyzed
using the two-point correlation function. However, this statistic does not
capture the topology of the distribution, and it is necessary to resort to
higher order correlation... | 3D Reconstruction of the Density Field: An SVD Approach to Weak Lensing
Tomography: We present a new method for constructing three-dimensional mass maps from
gravitational lensing shear data. We solve the lensing inversion problem using
truncation of singular values (within the context of generalized least squares
es... |
The Two-Phase, Two-Velocity Ionized Absorber in the Seyfert 1 Galaxy NGC
5548: We present an analysis of X-ray high quality grating spectra of the Seyfert 1
galaxy NGC 5548 using archival Chandra HETGS and LETGS observations for a total
exposure time of 800ks. The continuum emission is well represented by a
powerlaw ... | The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic
Survey DR16 luminous red galaxy and emission line galaxy samples: cosmic
distance and structure growth measurements using multiple tracers in
configuration space: We perform a multi-tracer analysis using the complete Sloan Digital Sky
Survey ... |
Improved model-independent constraints on the recombination era and
development of a direct projection method: The precision of recent experiments such as ${\it Planck}$ have allowed us to
constrain standard and non-standard physics (e.g., due to dark matter
annihilation or varying fundamental constants) during the r... | Galactic winds and stellar populations in Lyman $α$ emitting
galaxies at z ~ 3.1: We present a sample of 33 spectroscopically confirmed z ~ 3.1
Ly$\alpha$-emitting galaxies (LAEs) in the Cosmological Evolution Survey
(COSMOS) field. This paper details the narrow-band survey we conducted to
detect the LAE sample, the ... |
Constraining dark energy fluctuations with supernova correlations: We investigate constraints on dark energy fluctuations using type Ia
supernovae. If dark energy is not in the form of a cosmological constant, that
is if the equation of state is not equal to -1, we expect not only temporal,
but also spatial variations ... | Time delay between images of the lensed quasar UM673: We study brightness variations in the double lensed quasar UM673 (Q0142-100)
with the aim of measuring the time delay between its two images. In the paper
we combine our previously published observational data of UM673 obtained during
the 2003 - 2005 seasons at the ... |
Shock Waves and Cosmic Ray Acceleration in the Outskirts of Galaxy
Clusters: The outskirts of galaxy clusters are continuously disturbed by mergers and
gas infall along filaments, which in turn induce turbulent flow motions and
shock waves. We examine the properties of shocks that form within $r_{200}$ in
sample gala... | Constraints on Primordial non-Gaussianity from Future HI Intensity
Mapping Experiments: The primordial non-Gaussianity induces scale-dependent bias of the \hi with
respect to the underlying dark matter, which exhibits features on the very
large scales of the 21-cm power spectrum potentially observable with \hi
intens... |
Gamma-Ray Burst Afterglows as Analogues of High Frequency-Peaked BL Lac
Objects: The spectral properties from radio to optical bands are compared between the
18 optically bright Gamma-ray burst afterglows and well established
power-spectrum sequence in Blazars. The comparison shows that the afterglows
are well agreem... | Obscured star-formation and environment in the COSMOS field: We investigate the effects of the environment on star-formation in a sample
of massive luminous and ultra-luminous infrared galaxies (LIRGs and ULIRGs)
with S(24 micron)>80 uJy and i+<24 in the COSMOS field. We exploit the accurate
photometric redshifts in CO... |
The X-ray invisible Universe. A look into the halos undetected by
eROSITA: The paper presents the analysis of optically selected GAMA groups and
clusters in the SRG/eROSITA X-ray map of eFEDS (eROSITA Final Equatorial Depth
Survey), in the halo mass range $10^{13}-5{\times}10^{14}$ $M_{\odot}$ and at
$z < 0.2$. All X... | Nonhelical turbulence and the inverse transfer of energy: A parameter
study: We explore the phenomenon of the recently discovered inverse transfer of
energy from small to large scales in decaying magnetohydrodynamical turbulence
by Brandenburg et al. (2015) even for nonhelical magnetic fields. For this
investigation ... |
Deep learning dark matter map reconstructions from DES SV weak lensing
data: We present the first reconstruction of dark matter maps from weak lensing
observational data using deep learning. We train a convolution neural network
(CNN) with a Unet based architecture on over $3.6\times10^5$ simulated data
realizations ... | Hubble Diagram Dispersion From Large-Scale Structure: We consider the effects of large structures in the Universe on the Hubble
diagram. This problem is treated non-linearly by considering a Swiss Cheese
model of the Universe in which under-dense voids are represented as negatively
curved regions of space-time. Exact e... |
Constraints on the Nambu-Goto cosmic string contribution to the CMB
power spectrum in light of new temperature and polarisation data: Cosmic strings generate vector and tensor modes in the B-channel of
polarization, as well as the usual temperature power spectrum and E-mode
polarization spectrum. We use the power spe... | The (not so) squeezed limit of the primordial 3-point function: We prove that, in a generic single-field model, the consistency relation for
the 3-point function in the squeezed limit receives corrections that vanish
quadratically in the ratio of the momenta, i.e. as (k_L/k_S)^2. This implies
that a detection of a bisp... |
The Thermal Sunyaev-Zel'dovich Effect from Massive, Quiescent 0.5 $\leq$
z $\leq$ 1.5 Galaxies: We use combined South Pole Telescope (SPT)+Planck temperature maps to analyze
the circumgalactic medium (CGM) encompassing 138,235 massive, quiescent 0.5
$\leq$ z $\leq$ 1.5 galaxies selected from data from the Dark Energy... | The spin of late-type galaxies at redshifts z < 1.2: We study the evolution of the galactic spin using data of high redshift
galaxies in the fields of the Great Observatories Origins Deep Survey (GOODS).
Through simple dynamical considerations we estimate the spin for the disc
galaxies in our sample and find that its d... |
Evolution of Cosmological Parameters and Fundamental Constants in a Flat
Quintessence Cosmology: A Dynamical Alternative to ΛCDM: The primary purpose of this work is the provision of accurate, analytic,
evolutionary templates for cosmological parameters and fundamental constants in
a dynamical cosmology. A flat quint... | The WiggleZ Dark Energy Survey: Improved Distance Measurements to z = 1
with Reconstruction of the Baryonic Acoustic Feature: We present significant improvements in cosmic distance measurements from the
WiggleZ Dark Energy Survey, achieved by applying the reconstruction of the
baryonic acoustic feature technique. We ... |
Population III Star Formation in Magnetized Primordial Clouds: The evolution of primordial collapsing clouds and formation of
proto-Population III stars are investigated using three-dimensional ideal MHD
simulation. We calculated the evolution of magnetized primordial clouds from
the prestellar stage until the epoch af... | A novel PBH production mechanism from non-Abelian gauge fields during
inflation: We consider the case of axion-like particles (ALPs) during inflation. When
coupled to a non-Abelian gauge sector via a Chern-Simons term, ALPs support an
intriguing, testable, phenomenology with very distinctive features including
chiral... |
Pure Gravitational Wave Estimation of Hubble's Constant using Neutron
Star-Black Hole Mergers: Here we show how $H_0$ can be derived purely from the gravitational waves
(GW) of neutron star-black hole (NSBH) mergers. This new method provides an
estimate of $H_0$ spanning the redshift range, $z<0.25$ with current GW
s... | The Relation between Nuclear Activity and Stellar Mass in Galaxies: The existence of correlations between nuclear properties of galaxies, such as
the mass of their central black holes, and larger scale features, like the
bulge mass and luminosity, represent a fundamental constraint on galaxy
evolution. Although the act... |
Suzaku Discovery of a Hard Component Varying Independently of the
Power-Law Emission in MCG-6-30-15: Focusing on hard X-ray variability, we reanalyzed Suzaku data of Type I
Seyfert galaxy MCG-6-30-15 obtained in 2006. Intensity-sorted spectroscopy and
a principal component analysis consistently revealed a very hard c... | Review on non-directional direct dark matter searches: An overview of non-directional direct detection methods is given. The
currently leading experiments for spin independent WIMPs interactions are using
simultaneous measurement of two quantities for event-by-event background
discrimination in cryogenic bolometers and... |
How unusual is the cool-core radio halo cluster CL1821+643 ?: Massive galaxy clusters with cool-cores typically host diffuse radio sources
called mini-haloes, whereas, those with non-cool-cores host radio haloes. We
attempt to understand the unusual nature of the cool-core galaxy cluster
CL1821+643 that hosts a Mpc-sca... | The SINS/zC-SINF survey of z~2 galaxy kinematics: Outflow properties: Based on SINFONI Ha, [NII] and [SII] AO data of 30 z \sim 2 star-forming
galaxies (SFGs) from the SINS and zcSINF surveys, we find a strong correlation
of the Ha broad flux fraction with the star formation surface density of the
galaxy, with an appar... |
Observability of Dark Matter Substructure with Pulsar Timing
Correlations: Dark matter substructure on small scales is currently weakly constrained, and
its study may shed light on the nature of the dark matter. In this work we
study the gravitational effects of dark matter substructure on measured pulsar
phases in p... | Planck 2015 results. XIII. Cosmological parameters: We present results based on full-mission Planck observations of temperature
and polarization anisotropies of the CMB. These data are consistent with the
six-parameter inflationary LCDM cosmology. From the Planck temperature and
lensing data, for this cosmology we find... |
Exponential growth of the number density of massive early-type galaxies: We determine the evolution of the co-moving density of the most massive ($M_*
\geq 10^{12} M_\odot$) early-type galaxy population in the redshift range of $z
= 0.15$ - 0.45 in different stellar mass ranges using data from the Sloan
Digital Sky Sur... | Variable time flow as an alternative to dark energy: Time is a parameter playing a central role in our most fundamental modelling
of natural laws. Relativity theory shows that the comparison of times measured
by different clocks depends on their relative motions and on the strength of
the gravitational field in which t... |
Quasars probing intermediate redshift star-forming galaxies: We present a sample of 46 [OIII]-emitting galaxies at z<0.8 detected in the
fibre spectra of quasars from the SDSS-DR7 through an automatic search
procedure. We also detect [OII] and Hb emission lines from most of these
galaxies in the SDSS spectra. We study ... | Cosmology today-A brief review: This is a brief review of the standard model of cosmology. We first introduce
the FRW models and their flat solutions for energy fluids playing an important
role in the dynamics at different epochs. We then introduce different
cosmological lengths and some of their applications. The late... |
The Imprint of The Extragalactic Background Light in the Gamma-Ray
Spectra of Blazars: The light emitted by stars and accreting compact objects through the history
of the Universe is encoded in the intensity of the extragalactic background
light (EBL). Knowledge of the EBL is important to understand the nature of sta... | A Lyman alpha halo around a quasar at redshift z=6.4: We present long-slit spectroscopic data which reveals extended Lyman alpha
emission around the z=6.417 radio-quiet quasar CFHQS J2329-0301. The Lyman
alpha emission is extended over 15 kpc and has a luminosity of > 8 x 10^36 W,
comparable to the most luminous Lyman ... |
Careful calculation of thermodynamical functions of tachyon gas: We analyze several approaches to the thermodynamics of tachyon matter. The
energy spectrum of tachyons $\epsilon_k=\sqrt{k^2-m^2}$ is defined at $k\geq m$
and it is not evident how to determine the tachyonic distribution function and
calculate its thermod... | Cosmology with SKA Radio Continuum Surveys: Radio continuum surveys have, in the past, been of restricted use in
cosmology. Most studies have concentrated on cross-correlations with the cosmic
microwave background to detect the integrated Sachs-Wolfe effect, due to the
large sky areas that can be surveyed. As we move i... |
Major Merging: The Way to Make a Massive, Passive Galaxy: We analyze the projected axial ratio distribution, p(b/a), of galaxies that
were spectroscopically selected from the Sloan Digital Sky Survey (DR6) to have
low star-formation rates. For these quiescent galaxies we find a rather abrupt
change in p(b/a) at a stell... | The Cosmic Microwave Background: The history of its experimental
investigation and its significance for cosmology: This review describes the discovery of the cosmic microwave background
radiation in 1965 and its impact on cosmology in the 50 years that followed.
This discovery has established the Big Bang model of th... |
Crossing $w=-1$ by a single scalar field coupling with matter and the
observational constraints: Motivated by Yang-Mills dark energy model, we propose a new model by
introducing a logarithmic correction. we find that this model can avoid the
coincidence problem naturally and gives an equation of state $w$ smoothly
cr... | Are Newly Discovered HI High Velocity Clouds Minihalos in the Local
Group?: A set of HI sources extracted from the north Galactic polar region by the
ongoing ALFALFA survey has properties that are consistent with the
interpretation that they are associated with isolated minihalos in the
outskirts of the Local Group (... |
Current cosmological constraints on the curvature, dark energy and
modified gravity: We apply the Union2 compilation of 557 supernova Ia data, the baryon acoustic
oscillation measurement of distance, the cosmic microwave background radiation
data from the seven year Wilkinson Microwave Anisotropy Probe, and the Hubbl... | Ionized Gas in the Irr Galaxy IC 10: The Emission Spectrum and
Ionization Sources: We present the results of observations of the Irr galaxy IC 10 at the 6-m SAO
telescope with the panoramic Multi-Pupil Fiber Spectrograph (MPFS). Based on
the results of these observations and our long-slit spectroscopy performed
previ... |
X-ray emission from cosmic web filaments in SRG/eROSITA data: Using the publicly available eROSITA Final Equatorial Depth Survey (eFEDS)
data, we detected the stacked X-ray emissions at the position of 463 filaments
at a significance of 3.8 sigma based on the combination of all energy bands. In
parallel, we found that ... | A cosmic microwave background search for fine-structure constant
evolution: In some extensions of the standard model of particle physics, the values of
the fundamental coupling constants vary in space and time. Some observations of
quasars hint at time and spatial variation of the fine structure constant
$\alpha$. He... |
Weak-Lensing Mass Calibration of ACTPol Sunyaev-Zel'dovich Clusters with
the Hyper Suprime-Cam Survey: We present weak-lensing measurements using the first-year data from the Hyper
Suprime-Cam Strategic Survey Program on the Subaru telescope for eight galaxy
clusters selected through their thermal Sunyaev-Zel'dovich ... | The sub-mm morphology of the interacting galaxy NGC 3627: We present sub-mm continuum and heterodyne data of the interacting galaxy NGC
3627, obtained with the HHT and APEX. We find significant changes in the
molecular line ratios over small scales in the southeastern part of this
galaxy. The kinematics of the CO(2-1) ... |
Search for cold and hot gas in the ram pressure stripped Virgo dwarf
galaxy IC3418: We present IRAM 30m sensitive upper limits on CO emission in the ram pressure
stripped dwarf Virgo galaxy IC3418 and in a few positions covering HII regions
in its prominent 17 kpc UV/Ha gas-stripped tail. In the central few arcsecond... | Large HI optical depth and Redshifted 21-cm signal from cosmic dawn: The HI 21-cm optical depth ($\tau_b$) can be considerably large as the
kinetic and spin temperature of the inter-galactic medium (IGM) is expected to
be very low during cosmic dawn. It will be particularly higher at regions with
HI over-density. We re... |
Galaxy cluster searches based on photometric redshifts in the four
CFHTLS Wide fields: We have developed a method for detecting clusters in large imaging surveys,
based on the detection of structures in galaxy density maps made in slices of
photometric redshifts. This method was first applied to the Canada France
Haw... | Blind correction of the EB-leakage in the pixel domain: We study the problem of EB-leakage that is associated with incomplete
polarized CMB sky. In the blind case that assumes no additional information
about the statistical properties and amplitudes of the signal from the missing
sky region, we prove that the recycling... |
Testing bound dark energy with cosmological parameter and fundamental
constant evolution: A new bound dark energy, BDE, cosmology has been proposed where the dark
energy is the binding energy between light meson fields that condense a few
tens of years after the big bang. It is reported that the correct dark energy
d... | Imaging Systematics and Clustering of DESI Main Targets: We evaluate the impact of imaging systematics on the clustering of luminous
red galaxies (LRG), emission-line galaxies (ELG) and quasars (QSO) targeted for
the upcoming Dark Energy Spectroscopic Instrument (DESI) survey. Using Data
Release 7 of the DECam Legacy S... |
Modeling The GRB Host Galaxy Mass Distribution: Are GRBs Unbiased
Tracers of Star Formation?: We model the mass distribution of long gamma-ray burst (GRB) host galaxies
given recent results suggesting that GRBs occur in low metallicity
environments. By utilizing measurements of the redshift evolution of the
mass-meta... | Round Table Discussion at the Workshop "New Directions in Modern
Cosmology": The workshop "New directions in modern cosmology", organized by Theo
Nieuwenhuizen, Rudy Schild, Francesco Sylos Labini and Ruth Durrer, was held
from September 27 until October 1, 2010, in the Lorentz Center in Leiden, the
Netherlands. A tr... |
Abundance determination in HII regions from spectra without the
[OII]3727+3729 line: We suggest an empirical calibration for determination of oxygen and nitrogen
abundances and electron temperature in HII regions where the [OII]3727+3729
line (R_2) is not available. The calibration is based on the strong emission
lin... | Fractal Dimension as a measure of the scale of Homogeneity: In the multi-fractal analysis of large scale matter distribution, the scale
of transition to homogeneity is defined as the scale above which the fractal
dimension of underlying point distribution is equal to the ambient dimension of
the space in which points a... |
Gaussian Process Regression for foreground removal in HI intensity
mapping experiments: We apply for the first time Gaussian Process Regression (GPR) as a foreground
removal technique in the context of single-dish, low redshift HI intensity
mapping, and present an open-source Python toolkit for doing so. We use MeerK... | Rotation curves of rotating galactic BEC dark matter halos: We present the dynamics of rotating Bose Condensate galactic dark matter
halos, made of an ultralight spinless boson. We restrict to the case of adding
axisymmetric rigid rotation to initially spherically symmetric structures and
show there are three regimes: ... |
Gravitational Lens Recovery with GLASS: Measuring the mass profile and
shape of a lens: We use a new non-parametric gravitational modelling tool -- \Glass{} -- to
determine what quality of data (strong lensing, stellar kinematics, and/or
stellar masses) are required to measure the circularly averaged mass profile of
... | Inflationary magnetogenesis with a self-consistent coupling function: In this paper, we discuss the inflationary magnetogenesis scenario, in which
the coupling function is introduced to break the conformal invariance of
electromagnetic action. Unlike in conventional models, we deduce the Maxwell's
equations under the p... |
Spectroscopic identification of a redshift 1.55 supernova host galaxy
from the Subaru Deep Field Supernova Survey: Context: The Subaru Deep Field (SDF) Supernova Survey discovered 10 Type Ia
supernovae (SNe Ia) in the redshift range 1.5<z<2.0, as determined solely from
photometric redshifts of the host galaxies. Howe... | Effects of Lens Motion and Uneven Magnification on Image Spectra: Counter to intuition, the images of an extended galaxy lensed by a moving
galaxy cluster should have slightly different spectra in any metric gravity
theory. This is mainly for two reasons. One relies on the gravitational
potential of a moving lens being... |
On the radiative and thermodynamic properties of the Cosmic Microwave
Background radiation using COBE FIRAS instrument data: Use formulas to describe the monopole and dipole spectra of the Cosmic
Microwave Background (CMB) radiation, the exact expressions for the temperature
dependences of the radiative and thermodyn... | Parity violation in the CMB bispectrum by a rolling pseudoscalar: We investigate parity-violating signatures of temperature and polarization
bispectra of the cosmic microwave background (CMB) in an inflationary model
where a rolling pseudoscalar produces large equilateral tensor non-Gaussianity.
By a concrete computati... |
The ALPINE-ALMA [CII] survey: Survey strategy, observations and sample
properties of 118 star-forming galaxies at $4<z<6$: The ALMA-ALPINE [CII] survey is aimed at characterizing the properties of a
sample of normal star-forming galaxies (SFGs). The ALMA Large Program to
INvestigate (ALPINE) features 118 galaxies obs... | COSMOS weak-lensing constraints on modified gravity: The observed acceleration of the universe, explained through dark energy,
could alternatively be explained through a modification of gravity that would
also induce modifications in the evolution of cosmological perturbations. We
use new weak lensing data from the COS... |
Testing the assumptions of the Effective Field Theory of Large-Scale
Structure: The Effective Field Theory of Large-Scale Structure (EFTofLSS) attempts to
amend some of the shortcomings of the traditional perturbative methods used in
cosmology. It models the evolution of long-wavelength perturbations above a
cutoff s... | Galaxy clusters in local Universe simulations without density
constraints: a long uphill struggle: Galaxy clusters are excellent cosmological probes provided that their
formation and evolution within the large scale environment are precisely
understood. Therefore studies with simulated galaxy clusters have flourished... |
The Future of Primordial Black Holes: Open Questions and Roadmap: We discuss some of the the open questions and the roadmap in the physics of
primordial black holes. Black holes are the only dark matter candidate that is
known to actually exit. Their conjectured primordial role is admittedly based
on hypothesis rather ... | New constraints on very light pseudoscalars: Nearly massless axion-like particles are of interest for astrophysical
observations, and some constraints on their parameter space do exist in the
literature. Here, we propose to put new constraints on these particles using
polarisation and, in particular, the polarisation d... |
Angular momentum - mass relation for dark matter haloes: We study the empirical relation between an astronomical object's angular
momentum $J$ and mass $M$, $J=\beta M^\alpha$, the $J-M$ relation, using N-body
simulations. In particular, we investigate the time evolution of the $J-M$
relation to study how the initial p... | Determining $H_0$ using a model-independent method: By using type Ia supernovae (SNIa) to provide the luminosity distance (LD)
directly, which depends on the value of the Hubble constant $H_0= 100 h\; {\rm
km\; s^{-1}\; Mpc^{-1}}$, and the angular diameter distance from galaxy
clusters or baryon acoustic oscillations (... |
CMB statistical anisotropies of classical and quantum origins: We examine the impact of different anisotropic relics on inflation, in
particular the predictions on the density perturbations. These relics can be
the source of the large scale anomalies in the cosmic microwave background.
There are two different types of ... | Local Luminous Infrared Galaxies: Spatially resolved mid-infrared
observations with Spitzer/IRS: Luminous Infrared (IR) Galaxies (LIRGs) are an important cosmological class
of galaxies as they are the main contributors to the co-moving star formation
rate density of the universe at z=1. In this paper we present a GTO... |
Spatial Curvature Falsifies Eternal Inflation: Inflation creates large-scale cosmological density perturbations that are
characterized by an isotropic, homogeneous, and Gaussian random distribution
about a locally flat background. Even in a flat universe, the spatial curvature
measured within one Hubble volume receives... | Limits on primordial magnetic fields from primordial black hole
abundance: Primordial magnetic field (PMF) is one of the feasible candidates to explain
observed large-scale magnetic fields, for example, intergalactic magnetic
fields. We present a new mechanism that brings us information about PMFs on
small scales bas... |
A Dark Matter Superfluid: In this talk we present a novel framework that unifies the stunning success
of MOND on galactic scales with the triumph of the LambdaCDM model on
cosmological scales. This is achieved through the rich and well-studied physics
of superfluidity. The dark matter and MOND components have a common ... | Direct detection of WIMPs : Implications of a self-consistent truncated
isothermal model of the Milky Way's dark matter halo: Direct detection of Weakly Interacting Massive Particle (WIMP) candidates of
Dark Matter (DM) is studied within the context of a self-consistent truncated
isothermal model of the finite-size d... |
The Balmer decrement of SDSS galaxies: High resolution spectra are necessary to distinguish and correctly measure
the Balmer emission lines due to the presence of strong metal and Balmer
absorption features in the stellar continuum. This accurate measurement is
necessary for use in emission line diagnostics, such as th... | Testing spherical evolution for modelling void abundances: We compare analytical predictions of void volume functions to those measured
from N-body simulations, detecting voids with the zobov void finder. We push to
very small, nonlinear voids, below few Mpc radius, by considering the unsampled
DM density field. We als... |
From galactic bars to the Hubble tension: weighing up the astrophysical
evidence for Milgromian gravity: Astronomical observations reveal a major deficiency in our understanding of
physics $-$ the detectable mass is insufficient to explain the observed motions
in a huge variety of systems given our current understand... | The evolution of clustering length, large-scale bias and host halo mass
at 2<z<5 in the VIMOS Ultra Deep Survey (VUDS): We investigate the evolution of galaxy clustering for galaxies in the
redshift range 2.0<$z$<5.0 using the VIMOS Ultra Deep Survey (VUDS). We present
the projected (real-space) two-point correlation... |
Ly alpha escape during cosmological hydrogen recombination: the 3d-1s
and 3s-1s two-photon processes: We give a formulation of the radiative transfer equation for Lyman alpha
photons which allows us to include the two-photon corrections for the 3s-1s and
3d-1s decay channels during cosmological hydrogen recombination... | Statistical effects of the observer's peculiar velocity on source number
counts: The velocity of the Sun with respect to the cosmic microwave background (CMB)
can be extracted from the CMB dipole, provided its intrinsic dipole is assumed
to be small in comparison. This interpretation is consistent, within fairly
larg... |
On the Radio and Optical Luminosity Evolution of Quasars: We calculate simultaneously the radio and optical luminosity evolutions of
quasars, and the distribution in radio loudness R defined as the ratio of radio
and optical luminosities, using a flux limited data set containing 636 quasars
with radio and optical fluxe... | Disentangling the gamma-ray emission of NGC1275 and that of the Perseus
cluster: (Abridged). The gamma-ray emission from galaxy clusters hosting active
galaxies is a complex combination of diffuse and point-like emission with
different spectral and spatial properties. We discuss the case of the Perseus
cluster contai... |
Precision Tests of CO and [CII] Power Spectra Models against Simulated
Intensity Maps: Line intensity mapping (LIM) is an emerging technique with a unique potential
to probe a wide range of scales and redshifts. Realizing the full potential of
LIM, however, relies on accurate modeling of the signal. We introduce an
e... | Constraining the role of star cluster mergers in nuclear cluster
formation: Simulations confront integral-field data: We present observations and dynamical models of the stellar nuclear clusters
(NCs) at the centres of NGC 4244 and M33. We then compare these to an extensive
set of simulations testing the importance o... |
Carbon Detection in Early-Time Optical Spectra of Type Ia Supernovae: While O is often seen in spectra of Type Ia supernovae (SNe Ia) as both
unburned fuel and a product of C burning, C is only occasionally seen at the
earliest times, and it represents the most direct way of investigating
primordial white dwarf materia... | Pulsar Timing Array Constraints on Primordial Black Holes with NANOGrav
11-Year Data Set: The detection of binary black hole coalescences by LIGO/Virgo has aroused the
interest in primordial black holes (PBHs), because they could be both the
progenitors of these black holes and a compelling candidate of dark matter
(... |
Toward unbiased estimations of the statefinder parameters: With the use of simulated supernova catalogs, we show that the statefinder
parameters turn out to be poorly and biased estimated by standard cosmography.
To this end, we compute their standard deviations and several bias statistics
on cosmologies near the conco... | Testing for a large local void by investigating the Near-Infrared Galaxy
Luminosity Function: Recent cosmological modeling efforts have shown that a local underdensity on
scales of a few hundred Mpc (out to z ~ 0.1), could produce the apparent
acceleration of the expansion of the universe observed via type Ia superno... |
X-raying the Winds of Luminous Active Galaxies: We briefly describe some recent observational results, mainly at X-ray
wavelengths, on the winds of luminous active galactic nuclei (AGNs). These
winds likely play a significant role in galaxy feedback. Topics covered include
(1) Relations between X-ray and UV absorption ... | On the relation between Seyfert 2 accretion rate and environment at z <
0.1: We analyse different properties of the small scale environment of Seyfert 2
for two samples selected according to the accretion rate parameter, R, from the
DR7-SDSS survey. We compare the results with two control samples of non-active
galaxi... |
The Araucaria Project. Determination of the LMC Distance from Late-Type
Eclipsing Binary Systems: I. OGLE-051019.64-685812.3: We have analyzed the double-lined eclipsing binary system
OGLE-051019.64-685812.3 in the LMC which consists of two G4 giant components
with very similar effective temperatures. A detailed anal... | The metal-enriched host of an energetic gamma-ray burst at z ~ 1.6: (Abridged) Long gamma-ray burst (GRB) host galaxies might open a short-cut to
the characteristics of typical star-forming galaxies throughout the history of
the Universe. Due to the absence of near-infrared (NIR) spectroscopy, however,
detailed investi... |
Validating estimates of the growth rate of structure with modified
gravity simulations: We perform a validation of estimates of the growth rate of structure,
described by the parameter combination $f\sigma_8$, in modified gravity
cosmologies. We consider an analysis pipeline based on the redshift-space
distortion mod... | Hubble Space Telescope Observations of Mira Variables in the Type Ia
Supernova Host NGC 1559: An Alternative Candle to Measure the Hubble Constant: We present year-long, near-infrared Hubble Space Telescope WFC3 observations
used to search for Mira variables in NGC 1559, the host galaxy of the Type Ia
supernova (SN I... |
The Herschel Stripe 82 Survey (HerS): Maps and Early Catalog: We present the first set of maps and band-merged catalog from the Herschel
Stripe 82 Survey (HerS). Observations at 250, 350, and 500 micron were taken
with the Spectral and Photometric Imaging Receiver (SPIRE) instrument aboard
the Herschel Space Observator... | Scattered Emission from z~1 Galactic Outflows: Mapping Mg II resonance emission scattered by galactic winds offers a means
to determine the spatial extent and density of the warm outflow. Using
Keck/LRIS spectroscopy, we have resolved scattered Mg II emission to the east
of 32016857, a star-forming galaxy at z =0.9392 ... |
Unscreening Modified Gravity in the Matter Power Spectrum: Viable modifications of gravity that may produce cosmic acceleration need to
be screened in high-density regions such as the Solar System, where general
relativity is well tested. Screening mechanisms also prevent strong anomalies
in the large-scale structure a... | The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX
II) V. Exploring a local underdensity in the Southern Sky: Several claims have been made that we are located in a locally underdense
region of the Universe based on observations of supernovae and galaxy density
distributions. Two recent studies o... |
Time-Delay Cosmography: Measuring the Hubble Constant and other
cosmological parameters with strong gravitational lensing: Multiply lensed sources experience a relative time delay in the arrival of
photons. This effect can be used to measure absolute distances and the Hubble
constant ($H_0$) and is known as time-dela... | How cold is Dark Matter? Constraints from Milky Way Satellites: We test the luminosity function of Milky Way satellites as a constraint for
the nature of Dark Matter particles. We perform dissipationless high-resolution
N-body simulations of the evolution of Galaxy-sized halo in the standard Cold
Dark Matter (CDM) mode... |
ALFALFA HI Data Stacking II. HI content of the host galaxies of AGN: We use a stacking technique to measure the average HI content of a
volume-limited sample of 1871 AGN host galaxies from a parent sample of
galaxies selected from the SDSS and GALEX imaging surveys with stellar masses
greater than 10^10 M_sun and redsh... | Potential signature of a quadrupolar Hubble expansion in Pantheon+
supernovae: The assumption of isotropy -- that the Universe looks the same in all
directions on large scales -- is fundamental to the standard cosmological
model. This model forms the building blocks of essentially all of our
cosmological knowledge to... |
The Evolution and Mass Dependence of Galaxy Cluster Pressure Profiles at
0.05 $\le z \le$ 0.60 and $4 \times 10^{14}$ M$_{\odot}$ $\le
\textrm{M}_{500} \le 30 \times 10^{14}$ M$_{\odot}$: We have combined X-ray observations from Chandra with Sunyaev-Zel'dovich (SZ)
effect data from Planck and Bolocam to measure int... | The LyA-LyC Connection: Evidence for an Enhanced Contribution of
UV-faint Galaxies to Cosmic Reionization: The escape of ionizing Lyman Continuum (LyC) photons requires the existence
of low-N_HI sightlines, which also promote escape of Lyman-Alpha (Lya). We use
a suite of 2500 Lya Monte-Carlo radiative transfer simul... |
Evidence for spin alignment of spiral and elliptical/S0 galaxies in
filaments: Galaxies are not distributed randomly in the cosmic web but are instead
arranged in filaments and sheets surrounding cosmic voids. Observationally
there is still no convincing evidence of a link between the properties of
galaxies and their... | Optical emission line properties of a sample of the broad-line AGNs: the
Baldwin effect and eigenvector 1: We divide a sample of 302 type-1 AGNs into two subsamples based on the narrow
line [OIII]/Hbeta_{NLR} ratio, since we expect that there will be a stronger
starburst (HII region) contribution to the narrow line e... |
3D-MHD simulations of the evolution of magnetic fields in FR II radio
sources: 3D-MHD numerical simulations of bipolar, hypersonic, weakly magnetized jets
and synthetic synchrotron observations are presented to study the structure and
evolution of magnetic fields in FR II radio sources. The magnetic field setup
in th... | CMB Angular Power Spectrum from Correlated Primordial Fluctuation: The usual inflationary scenario predicts a Gaussian random primordial density
fluctuation, different Fourier modes of which do not correlate with each other.
In this paper we propose a correlation between these different modes. A simple
case is that the... |
Polarizations of CMB and the Hubble tension: Future precision measurements of CMB polarizations can shed new light on the
problem so called Hubble tension. The Hubble tension comes from the difference
of the evolutions of the Hubble parameter which are determined with two
different distance ladders. The standard distan... | What can the spatial distribution of galaxy clusters tell about their
scaling relations?: We aim to quantify the capability of the inhomogeneous distribution of galaxy
clusters, represented by the two-point statistics in Fourier space, to retrieve
information on the underlying scaling relations. We make a case study ... |
Three-Dimensional Simulations of Bi-Directed Magnetohydrodynamic Jets
Interacting with Cluster Environments: We report on a series of three-dimensional magnetohydrodynamic simulations of
active galactic nucleus (AGN) jet propagation in realistic models of magnetized
galaxy clusters. We are primarily interested in the... | Intensity Mapping of the [CII] Fine Structure Line during the Epoch of
Reionization: The atomic CII fine-structure line is one of the brightest lines in a typical
star-forming galaxy spectrum with a luminosity ~ 0.1% to 1% of the bolometric
luminosity. It is potentially a reliable tracer of the dense gas distribution... |
NECOLA: Towards a Universal Field-level Cosmological Emulator: We train convolutional neural networks to correct the output of fast and
approximate N-body simulations at the field level. Our model, Neural Enhanced
COLA --NECOLA--, takes as input a snapshot generated by the computationally
efficient COLA code and correc... | A common explanation of the Hubble tension and anomalous cold spots in
the CMB: The standard cosmological paradigm narrates a reassuring story of a universe
currently dominated by an enigmatic dark energy component. Disquietingly, its
universal explaining power has recently been challenged by, above all, the
$\sim4\s... |
Solution for cosmological observables in the Starobinsky model of
inflation: This paper focuses on the Starobinsky model of inflation. We derive solutions
for various cosmological observables, such as the scalar spectral index $n_s$,
the tensor-to-scalar ratio $r$ and their runnings, as well as the number of
$e$-fold... | Photo-zSNthesis: Converting Type Ia Supernova Lightcurves to Redshift
Estimates via Deep Learning: Upcoming photometric surveys will discover tens of thousands of Type Ia
supernovae (SNe Ia), vastly outpacing the capacity of our spectroscopic
resources. In order to maximize the science return of these observations in... |
The Delay of Population III Star Formation by Supersonic Streaming
Velocities: It has recently been demonstrated that coherent relative streaming velocities
of order 30 km / s between dark matter and gas permeated the universe on scales
below a few Mpc directly after recombination. We here use a series of
high-resolu... | Diffuse Radio Emission in Abell 754: We present a low frequency study of the diffuse radio emission in the galaxy
cluster A754. We present new 150 MHz image of the galaxy cluster A754 made with
the Giant Metrewave Radio Telescope (GMRT) and discuss the detection of 4
diffuse features. We compare the 150 MHz image with ... |
Opening the reheating box in multifield inflation: The robustness of multi-field inflation to the physics of reheating is
investigated. In order to carry out this study, reheating is described in
detail by means of a formalism which tracks the evolution of scalar fields and
perfect fluids in interaction (the inflatons ... | Inferring the IGM thermal history during reionisation with the
Lyman-$α$ forest power spectrum at redshift $z \simeq 5$: We use cosmological hydrodynamical simulations to assess the feasibility of
constraining the thermal history of the intergalactic medium during
reionisation with the Ly$\alpha$ forest at $z\simeq5$... |
On the power spectrum generated during inflation: Recently there have been differing viewpoints on how to evaluate the
curvature power spectrum generated during inflation. Since the primordial
curvature power spectrum is the seed for structure formation and provides a
link between observations and inflationary paramete... | Mid-IR Luminosities and UV/Optical Star Formation Rates at z<1.4: UV continuum and mid-IR emission constitute two widely used star formation
indicators at intermediate and high redshifts. We study 2430 galaxies with
z<1.4 in the Extended Groth Strip with MIPS 24 mic observations from FIDEL,
spectroscopy from DEEP2, and... |
Spectral Energy Distribution Models for Low-luminosity Active Galactic
Nuclei in LINERs: Low-luminosity active galactic nuclei (LLAGNs) represent the bulk of the AGN
population in the present-day universe and they trace the low-level accreting
supermassive black holes. In order to probe the accretion and jet physical... | Toward A Consistent Picture For CRESST, CoGeNT and DAMA: Three dark matter direct detection experiments (DAMA/LIBRA, CoGeNT, and
CRESST-II) have each reported signals which are not consistent with known
backgrounds, but resemble that predicted for a dark matter particle with a mass
of roughly $\sim$10 GeV and an elasti... |
Spatial Distribution of Intracluster Light versus Dark Matter in Horizon
Run 5: One intriguing approach for studying the dynamical evolution of galaxy
clusters is to compare the spatial distributions among various components, such
as dark matter, member galaxies, gas, and intracluster light (ICL). Utilizing
the recen... | Cosmological test of local position invariance from the asymmetric
galaxy clustering: The local position invariance (LPI) is one of the three major pillars of
Einstein equivalence principle, ensuring the space-time independence on the
outcomes of local experiments. The LPI has been tested by measuring the
gravitation... |
Testing the cosmic conservation of photon number with type Ia supernovae
and ages of old objects: In this paper, we obtain luminosity distances by using ages of 32 old passive
galaxies distributed over the redshift interval $0.11 < z < 1.84$ and test the
cosmic conservation of photon number by comparing them with 580... | Understanding the nature of luminous red galaxies (LRGs): Connecting
LRGs to central and satellite subhalos: We develop a novel abundance matching method to construct a mock catalog of
luminous red galaxies (LRGs) in SDSS, using catalogs of halos and subhalos in
N-body simulations for a LCDM model. Motivated by obser... |
Constraining holographic inflation with WMAP: In a class of recently proposed models, the early universe is strongly
coupled and described holographically by a three-dimensional, weakly coupled,
super-renormalizable quantum field theory. This scenario leads to a power
spectrum of scalar perturbations that differs from ... | Test of the Einstein equivalence principle with spectral distortions in
the cosmic microwave background: The Einstein Equivalence Principle~(EEP) can be verified by the measurement
of the spectral distortions of the Cosmic Microwave Background (CMB). The
existence of energy-dependency in the cosmological redshift eff... |
Type-Ia supernova rates and the progenitor problem, a review: The identity of the progenitor systems of type-Ia supernovae (SNe Ia) is a
major unsolved problem in astrophysics. SN Ia rates are providing some striking
clues. We review the basics of SN rate measurement, preach about some sins of
SN rate measurement and a... | How the Dark Energy Can Reconcile \textit{Planck} with Local
Determination of the Hubble Constant: We try to reconcile the tension between the local 2.4\% determination of
Hubble constant and its global determination by $\textit{Planck}$ CMB data and
BAO data through modeling the dark energy variously. We find that t... |
PICS: Simulations of Strong Gravitational Lensing in Galaxy Clusters: Gravitational lensing has become one of the most powerful tools available for
investigating the 'dark side' of the universe. Cosmological strong
gravitational lensing, in particular, probes the properties of the dense cores
of dark matter halos over ... | Modeling the reconstructed BAO in Fourier space: The density field reconstruction technique, which was developed to partially
reverse the nonlinear degradation of the Baryon Acoustic Oscillation (BAO)
feature in the galaxy redshift surveys, has been successful in substantially
improving the cosmology constraints from r... |
Effect of primordial non-Gaussianities on the far-UV luminosity function
of high-redshift galaxies: implications for cosmic reionization: [Abridged] Understanding how the intergalactic medium (IGM) was reionized at
z > 6 is one of the big challenges of current high redshift astronomy. It
requires modelling the collap... | Noiseless Gravitational Lensing Simulations: The microphysical properties of the DM particle can, in principle, be
constrained by the properties and abundance of substructures in DM halos, as
measured through strong gravitational lensing. Unfortunately, there is a lack
of accurate theoretical predictions for the lensin... |
A 21-cm power spectrum at 48 MHz, using the Owens Valley Long Wavelength
Array: The Large-aperture Experiment to detect the Dark Age (LEDA) was designed to
measure the 21-cm signal from neutral hydrogen at Cosmic Dawn, $z \approx
$15-30. Using observations made with the $\approx $ 200 m diameter core of the
Owens Val... | The thermal history of the intergalactic medium at $3.9 \leq z \leq 4.3$: A new determination of the temperature of the intergalactic medium over $3.9
\leq z \leq 4.3$ is presented. We applied the curvature method on a sample of
10 high resolution quasar spectra from the Ultraviolet and Visual Echelle
Spectrograph on t... |
Probing ionizing radiation of L<~0.1L* star-forming galaxies at z>~3
with strong lensing: We show the effectiveness of strong lensing in the characterisation of Lyman
continuum emission from faint L<~0.1L* star-forming galaxies at redshift >~ 3.
Past observations of L>~L* galaxies at redshift >~3 have provided upper ... | Observed Scaling Relations for Strong Lensing Clusters: Consequences for
Cosmology and Cluster Assembly: Scaling relations of observed galaxy cluster properties are useful tools for
constraining cosmological parameters as well as cluster formation histories.
One of the key cosmological parameters, sigma8, is constrai... |
Interaction between collisionless galactic discs and nonaxissymmetric
dark matter haloes: Using $N$-body simulations ($N\sim 10^6 - 10^7$), we examine how a
non-axisymmetric dark halo affects the dynamical evolution of the structure in
collisionless (stellar) discs. We demonstrate how the model parameters such as
mas... | A numerical model of resistive generation of intergalactic magnetic
field at cosmic dawn: Miniati and Bell (2011) proposed a mechanism for the generation of magnetic
seeds that is based the finite resistivity of the low temperature IGM in the
high redshift universe. In this model, cosmic-ray protons generated by the
... |
Dark Energy Survey Year 1 Results: Methods for Cluster Cosmology and
Application to the SDSS: We perform the first blind analysis of cluster abundance data. Specifically,
we derive cosmological constraints from the abundance and weak-lensing signal
of \redmapper\ clusters of richness $\lambda\geq 20$ in the redshift ... | Early-type galaxies at z~1.3. II. Masses and ages of early-type galaxies
in different environments and their dependence on stellar population model
assumptions: We have derived masses and ages for 79 early-type galaxies (ETGs) in
different environments at z~1.3 in the Lynx supercluster and in the GOODS/CDF-S
field ... |
Formation rates of Dark Matter Haloes: We derive an estimate of the rate of formation of dark matter halos per unit
volume as a function of the halo mass and redshift of formation. Analytical
estimates of the number density of dark matter halos are useful in modeling
several cosmological phenomena. We use the excursion... | Exact nonlinear inhomogeneities in $Λ$CDM cosmology: At a time when galaxy surveys and other observations are reaching
unprecedented sky coverage and precision it seems timely to investigate the
effects of general relativistic nonlinear dynamics on the growth of structures
and on observations. Analytic inhomogeneous co... |
The Kinematic Sunyaev-Zel'dovich Effect with Projected Fields: A Novel
Probe of the Baryon Distribution with Planck, WMAP, and WISE Data: The kinematic Sunyaev-Zel'dovich (kSZ) effect --- the Doppler boosting of
cosmic microwave background (CMB) photons due to Compton-scattering off free
electrons with non-zero bulk ... | 2MASS photometry and age estimate of globular clusters in the outer halo
of M31: We present the first photometric results in J, H, and K_s from 2MASS imaging
of 10 classical globular clusters in the far outer regions of M31. Combined
with the V and I photometric data from previous literature, we constructed the
color... |
On the Spin Bias of Satellite Galaxies in the Local Group-like
Environment: We utilize the Millennium-II simulation databases to study the spin bias of
dark subhalos in the Local Group-like systems which have two prominent
satellites with comparable masses. Selecting the group-size halos with total
mass similar to th... | Fossil Groups Origins: I. RX J105453.3+552102 a very massive and relaxed
system at z~0.5: The most accepted scenario for the origin of fossil groups (FGs) is that they
are galaxy associations in which the merging rate was fast and efficient. These
systems have assembled half of their mass at early epoch of the Univer... |
Aspects of Dark Matter Annihilation in Cosmology: Cosmic microwave background (CMB) constraints on dark matter annihilation are
a uniquely powerful tool in the quest to understand the nature of dark matter.
Annihilation of dark matter to Standard Model particles between recombination
and reionization heats baryons, ion... | The insignificance of major mergers in driving star formation at z~2: We study the significance of major-merger-driven star formation in the early
Universe, by quantifying the contribution of this process to the total star
formation budget in 80 massive (M* > 10^10 MSun) galaxies at z~2. Employing
visually-classified m... |
Star formation efficiency in the Barred Spiral Galaxy NGC 4303: We present new $^{12}$CO(J=1-0) observations of the barred galaxy NGC 4303
using the Nobeyama 45m telescope (NRO45) and the Combined Array for Research in
Millimeter-wave Astronomy (CARMA). The H$\alpha$ images of barred spiral
galaxies often show active s... | The Progenitor of Supernova 2011dh/PTF11eon in Messier 51: We have identified a luminous star at the position of supernova (SN)
2011dh/PTF11eon, in pre-SN archival, multi-band images of the nearby, nearly
face-on galaxy Messier 51 (M51) obtained by the Hubble Space Telescope with the
Advanced Camera for Surveys. This i... |
Sensitivity of galaxy cluster dark energy constraints to halo modeling
uncertainties: We perform a sensitivity study of dark energy constraints from galaxy cluster
surveys to uncertainties in the halo mass function, bias and the
mass-observable relation. For a set of idealized surveys, we evaluate
cosmological constr... | Redshift Drift in LTB Void Universes: We study the redshift drift, i.e., the time derivative of the cosmological
redshift in the Lema\^itre-Tolman-Bondi (LTB) solution in which the observer is
assumed to be located at the symmetry center. This solution has often been
studied as an anti-Copernican universe model to expl... |
Toward a Measurement of the Transverse Peculiar Velocity of Galaxy Pairs: The transverse peculiar velocities caused by the mass distribution of
large-scale structure provide a test of the theoretical matter power spectrum
and the cosmological parameters that contribute to its shape. Typically, the
matter density distri... | A Bayesian method for combining theoretical and simulated covariance
matrices for large-scale structure surveys: Accurate and precise covariance matrices will be important in enabling
planned cosmological surveys to detect new physics. Standard methods imply
either the need for many N-body simulations in order to obt... |
TDCOSMO IV: Hierarchical time-delay cosmography -- joint inference of
the Hubble constant and galaxy density profiles: The H0LiCOW collaboration inferred via gravitational lensing time delays a
Hubble constant $H_0=73.3^{+1.7}_{-1.8}$ km s$^{-1}{\rm Mpc}^{-1}$, describing
deflector mass density profiles by either a p... | Astrophysical Distance Scale IV. Preliminary Zero-Point Calibration of
the JAGB Method in the HST/WFC3-IR Broad J-Band (F110W) Filter: We present an absolute calibration of the J-region Asymptotic Giant Branch
(JAGB) method using published photometry of resolved stars in 20 nearby
galaxies observed with HST using the... |
Resummed Perturbation Theory of Galaxy Clustering: The relationship between observed tracers such as galaxies and the underlying
dark matter distribution is crucial in extracting cosmological information. As
the linear bias model breaks down at quasi-linear scales, the standard
perturbative approach of the nonlinear Eu... | CSST WL preparation I: forecast the impact from non-Gaussian covariances
and requirements on systematics-control: The precise estimation of the statistical errors and accurate removal of the
systematical errors are the two major challenges for the stage IV cosmic shear
surveys. We explore their impact for the China S... |
Phenomenology of dark energy: general features of large-scale
perturbations: We present a systematic exploration of dark energy and modified gravity
models containing a single scalar field non-minimally coupled to the metric.
Even though the parameter space is large, by exploiting an effective field
theory (EFT) form... | Stability of cosmological detonation fronts: The steady state propagation of a phase transition front is classified,
according to hydrodynamics, as a deflagration or a detonation, depending on its
velocity with respect to the fluid. These propagation modes are further divided
into three types, namely, weak, Jouguet, an... |
Mind the gap: the power of combining photometric surveys with intensity
mapping: The long wavelength modes lost to bright foregrounds in the interferometric
21-cm surveys can partially be recovered using a forward modeling approach that
exploits the non-linear coupling between small and large scales induced by
gravit... | Combining galaxy and 21cm surveys: Acoustic waves traveling through the early Universe imprint a characteristic
scale in the clustering of galaxies, QSOs and inter-galactic gas. This scale
can be used as a standard ruler to map the expansion history of the Universe, a
technique known as Baryon Acoustic Oscillations (BA... |
Stochastic inflationary dynamics beyond slow-roll and consequences for
primordial black hole formation: We consider the impact of quantum diffusion on inflationary dynamics during
an ultra-slow-roll phase, which can be of particular significance for the
formation of primordial black holes. We show, by means of a full... | Sunyaev-Zel'dovich anisotropy due to Primordial black holes: We investigate the Sunyaev-Zel'dovich (SZ) effect caused by primordial black
holes (PBHs) on the cosmic microwave background (CMB) temperature fluctuations.
The gas accreting on a PBH heats up by the release of the gravitational energy.
As a result, the heate... |
A Bayesian Approach to Locating the Red Giant Branch Tip Magnitude (Part
I): We present a new approach for identifying the Tip of the Red Giant Branch
(TRGB) which, as we show, works robustly even on sparsely populated targets.
Moreover, the approach is highly adaptable to the available data for the
stellar populatio... | Accounting for baryonic effects in cosmic shear tomography: Determining
a minimal set of nuisance parameters using PCA: Systematic uncertainties that have been subdominant in past large-scale
structure (LSS) surveys are likely to exceed statistical uncertainties of
current and future LSS data sets, potentially limiti... |
Constraints on the magnetic field in the inter-cluster bridge A399-A401: Galaxy cluster mergers are natural consequences of the structure formation in
the Universe. Such events involve a large amount of energy ($\sim 10^{63}$ erg)
dissipated during the process. Part of this energy can be channelled in
particle accelera... | Cosmological dynamics and observational constraints on a viable $f(Q)$
non-metric gravity model: Inspired by an exponential $f(R)$ gravity model studied in the literature, in
this work we introduce a new and viable $f(Q)$ gravity model, which can be
represented as a perturbation of $\Lambda$CDM. Typically, within the... |
The Central PNe Populations of External Galaxies with SAURON: Thanks to SAURON integral-field observations we uncovered the Planetary
Nebulae (PNe) populations inhabiting the central and nuclear regions of our
galactic neighbours M32 and M31, respectively, and discuss the significant
differences between their correspon... | Coming of Age of the Standard Model: Cosmology now has a standard model - a remarkably simple description of the
universe, its contents and its history. A symposium held last September in
Cambridge, UK, gave this model a 'health check' and discussed fascinating
questions that lie beyond it. |
The spatial and velocity bias of linear density peaks and proto-haloes
in the Lambda cold dark matter cosmology: We use high resolution N-body simulations to investigate the Lagrangian bias
of cold dark matter haloes within the LCDM cosmology. Our analysis focuses on
"proto-haloes", which we identify in the simulatio... | Simulating Calibration and Beam Systematics for a Future CMB Space
Mission with the TOAST Package: We address in this work the instrumental systematic errors that can
potentially affect the forthcoming and future Cosmic Microwave Background
experiments aimed at observing its polarized emission. In particular, we focu... |
Slow-roll Inflation with the Gauss-Bonnet and Chern-Simons Corrections: We study slow-roll inflation with the Gauss-Bonnet and Chern-Simons
corrections. We obtain general formulas for the observables: spectral indices,
tensor-to-scalar ratio and circular polarization of gravitational waves. The
Gauss-Bonnet term violat... | On Model Selection in Cosmology: We review some of the common methods for model selection: the goodness of
fit, the likelihood ratio test, Bayesian model selection using Bayes factors,
and the classical as well as the Bayesian information theoretic approaches. We
illustrate these different approaches by comparing model... |
Further understanding the interaction between dark energy and dark
matter: current status and future directions: The interaction between dark matter and dark energy can be incorporated into
field theory models of dark energy that have proved successful in alleviating
the coincidence problem. We review recent advances... | New Constraints On Cosmic Polarization Rotation Including SPTpol B-mode
Polarization Observations: We present an update of the cosmic polarization rotation (CPR) constraint
from the recent SPTpol measurements of sub-degree B-mode polarization in the
cosmic microwave background (CMB) of 100 square degrees of sky. Our ... |
Pahs, Ionized Gas, and Molecular Hydrogen in Brightest Cluster Galaxies
of Cool Core Clusters of Galaxies: We present measurements of 5-25 {\mu}m emission features of brightest cluster
galaxies (BCGs) with strong optical emission lines in a sample of 9 cool-core
clusters of galaxies observed with the Infrared Spectro... | A New Equation of State for Dark Energy Model: A new parameterization for the dark energy equation of state(EoS) is proposed
and some of its cosmological consequences are also investigated. This new
parameterization is the modification of Efstathiou' dark energy EoS
parameterization. $w (z)$ is a well behaved function ... |
Canonical single field slow-roll inflation with a non-monotonic
tensor-to-scalar ratio: We take a pragmatic, model independent approach to single field slow-roll
canonical inflation by imposing conditions, not on the potential, but on the
slow-roll parameter $\epsilon(\phi)$ and its derivatives $\epsilon^{\prime
}(\p... | Hill-climbing dark inflation: Within the framework of the scalar-tensor theory we consider a hill-climbing
inflation, in which the effective Planck mass increases in time. We obtain the
Einstein frame potential with infinitely long and flat plateau as we approach
towards the strong coupling regime, together with a run-... |
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