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Gravitational lensing effects of supermassive black holes in cluster
environments: This study explores the gravitational lensing effects of supermassive black
holes (SMBHs) in galaxy clusters. While the presence of central SMBHs in
galaxies is firmly established, recent work from high-resolution simulations
predict t... | Anisotropic Distance Ladder in Pantheon+ Supernovae: We decompose Pantheon+ Type Ia supernovae (SN) in hemispheres on the sky
finding angular variations up to $4$ km/s/Mpc in the Hubble constant $H_0$ both
in the SH0ES redshift range $0.0233 < z < 0.15$ and in extended redshift
ranges. The variations are driven largely... |
The dusty heart of nearby active galaxies -- II. From clumpy torus
models to physical properties of dust around AGN: The dusty environments (= "dust tori'') of AGN are now in reach of
observations. Following our paper I on ground-based mid-IR spectro-photometry
(H\"onig et al. 2010), we present an upgrade to our radi... | Baryon Acoustic Oscillations in the Sloan Digital Sky Survey Data
Release 7 Galaxy Sample: The spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy
sample represents the final set of galaxies observed using the original SDSS
target selection criteria. We analyse the clustering of galaxies within ... |
GOODS-Herschel: radio-excess signature of hidden AGN activity in distant
star-forming galaxies: We present here a new spectral energy distribution (SED) fitting approach
that we adopt to select radio-excess sources amongst distant star-forming
galaxies in the GOODS-Herschel (North) field and to reveal the presence of... | Integral Field Spectroscopy surveys of nearby spiral and U-LIRG galaxies: We describe the observations and preliminary results of the gas-phase
analysis based on two ongoing, wide-field Integral Field Spectroscopy (IFS)
surveys: the PPAK IFS Nearby Galaxies Survey (PINGS), targeting disc galaxies;
and the VIMOS-IFU obs... |
Single parameter galaxy classification: The Principal Curve through the
multi-dimensional space of galaxy properties: We propose to describe the variety of galaxies from SDSS by using only one
affine parameter. To this aim, we build the Principal Curve (P-curve) passing
through the spine of the data point cloud, cons... | Toward Cosmological Standard Timers in Primordial Black Hole Binaries: We propose that primordial black hole (PBH) binary systems can lead to
standard timers in tracking the evolution of the Universe. Through
gravitational waves from monochromatic PBH binaries, the probability
distribution on major axis and eccentricit... |
The reach of next-to-leading-order perturbation theory for the matter
bispectrum: We provide a comparison between the matter bispectrum derived with different
flavours of perturbation theory at next-to-leading order and measurements from
an unprecedentedly large suite of $N$-body simulations. We use the $\chi^2$
good... | Modified Gravity: the CMB, Weak Lensing and General Parameterisations: We examine general physical parameterisations for viable gravitational models
in the $f(R)$ framework. This is related to the mass of an additional scalar
field, called the scalaron, that is introduced by the theories. Using a simple
parameterisatio... |
Flow Patterns around Dark Matter Halos: the Link between Halo Dynamical
Properties and Large Scale Tidal Field: We study how halo intrinsic dynamical properties are linked to their
formation processes for halos in two mass ranges, $10^{12}-10^{12.5}h^{-1}{\rm
M_\odot}$ and $\ge 10^{13}h^{-1}{\rm M_\odot}$, and how bo... | The LABOCA survey of the Extended Chandra Deep Field South: Two modes of
star formation in AGN hosts?: We study the co-existence of star formation and AGN activity in X-ray
selected AGN by analyzing stacked 870um submm emission from a deep and wide map
of the Extended Chandra Deep Field South, obtained with LABOCA at... |
Analysis of the impact of broad absorption lines on quasar redshift
measurements with synthetic observations: Accurate quasar classifications and redshift measurements are increasingly
important to precision cosmology experiments. Broad absorption line (BAL)
features are present in 15-20\% of all quasars, and these f... | A self-consistent phase-space distribution function for the anisotropic
Dark Matter halo of the Milky Way: Dark Matter (DM) direct detection experiments usually assume the simplest
possible 'Standard Halo Model' for the Milky Way (MW) halo in which the
velocity distribution is Maxwellian. This model assumes that the ... |
Prediction of the Cosmic Evolution of the CO-Luminosity Functions: We predict the emission line luminosity functions (LFs) of the first 10
rotational transitions of CO in galaxies at redshift z=0 to z=10. This
prediction relies on a recently presented simulation of the molecular cold gas
content in ~3e7 evolving galaxi... | Dark Matter annihilations in halos and high-redshift sources of
reionization of the universe: It is well known that annihilations in the homogeneous fluid of dark matter
(DM) can leave imprints in the cosmic microwave background (CMB) anisotropy
power spectrum. However, the relevance of DM annihilations in halos for
... |
The Swift short gamma-ray burst rate density: implications for binary
neutron star merger rates: Short gamma-ray bursts (SGRBs) observed by {\it Swift} are potentially
revealing the first insight into cataclysmic compact object mergers. To
ultimately acquire a fundamental understanding of these events requires
pan-sp... | The Subaru Ly-alpha blob survey: A sample of 100 kpc Ly-alpha blobs at
z=3: We present results of a survey for giant Ly-alpha nebulae (LABs) at z=3 with
Subaru/Suprime-Cam. We obtained Ly-alpha imaging at z=3.09+-0.03 around the
SSA22 protocluster and in several blank fields. The total survey area is 2.1
square degre... |
From the cosmological model to generation of the Hubble flow: We review different approaches to the problem of generating the observed
Hubble flow, whose discussion was pioneered by A.D. Sakharov. Extrapolating the
Cosmological Standard Model to the past makes it possible to determine physical
properties of and conditi... | On the EFT of Large Scale Structures in Redshift Space: We further develop the description of redshift space distortions within the
Effective Field Theory of Large Scale Structures. First, we generalize the
counterterms to include the effect of baryonic physics and primordial
non-Gaussianity. Second, we evaluate the IR... |
Evidence for departure from ΛCDM with LSS: We investigate the growth index parameter \gamma and the time variation of
the gravitational constant G_{eff} by using the currently available growth
function f(z) data at different redshifts, with and without scaling to the
fiducial \Lambda CDM model. We inquire the four diff... | Inflation and Early Dark Energy with a Stage II Hydrogen Intensity
Mapping Experiment: This white paper envisions a revolutionary post-DESI, post-LSST dark energy
program based on intensity mapping of the redshifted 21cm emission line from
neutral hydrogen at radio frequencies. The proposed intensity mapping survey
h... |
BBN And The CMB Constrain Neutrino Coupled Light WIMPs: (abridged) In the presence of a light WIMP (mass m_chi < 30 MeV), there are
degeneracies among the WIMP's nature, its couplings to standard model
particles, its mass, and the number of equivalent (additional) neutrinos, Delta
N_nu. These degeneracies cannot be bro... | Constraints on the Nature of CID-42: Recoil Kick or Supermassive Black
Hole Pair?: The galaxy CXOC J100043.1+020637, also known as CID-42, is a highly unusual
object. An apparent galaxy merger remnant, it displays signatures of both an
inspiraling, kiloparsec-scale active galactic nucleus (AGN) pair and of a
recoilin... |
The dust emission of high-redshift quasars: The detection of powerful near-infrared emission in high redshift (z>5)
quasars demonstrates that very hot dust is present close to the active nucleus
also in the very early universe. A number of high-redshift objects even show
significant excess emission in the rest frame NI... | CMB anisotropies generated by cosmic string loops: We investigate the contribution of cosmic string loops to the Cosmic
Microwave Background (CMB) anisotropies. This is done by extending the
Unconnected Segment Model (USM) to include the contribution of the cosmic
string loops created throughout the cosmological evolut... |
Circular Polarization of the CMB: A probe of the First stars: While it is revealed that the Cosmic Microwave Background (CMB) is linearly
polarized at 10 % level, it is predicted that there exists no significant
intrinsic source for circular polarization (CP) in the standard cosmology.
However, during the propagation t... | Interacting dark energy from the joint analysis of the power spectrum
and bispectrum multipoles with the EFTofLSS: Interacting dark energy models have been suggested as alternatives to the
standard cosmological model, $\Lambda$CDM. We focus on a phenomenologically
interesting class of dark scattering models that is c... |
Beyond dark energy Fisher forecasts: how DESI will constrain LCDM and
quintessence models: We baseline with current cosmological observations to forecast the power of
the Dark Energy Spectroscopic Instrument (DESI) in two ways: 1. the gain in
constraining power of parameter combinations in the standard $\Lambda$CDM
m... | Adaptively refined large eddy simulations of clusters: We present a numerical scheme for modelling unresolved turbulence in
cosmological adaptive mesh refinement codes. As a first application, we study
the evolution of turbulence in the intra-cluster medium and in the core of a
galaxy cluster. Simulations with and with... |
Constraints on primordial black holes as dark matter candidates from
capture by neutron stars: We investigate constraints on primordial black holes (PBHs) as dark matter
candidates that arise from their capture by neutron stars (NSs). If a PBH is
captured by a NS, the star is accreted onto the PBH and gets destroyed ... | The Yukawa-Coupled Dark Sector Model and Cosmological Tensions: In this paper, we investigate the interaction between early dark energy (EDE)
and cold dark matter, proposing a Yukawa-coupled dark sector model to mitigate
cosmological tensions. We utilize the EDE component in the coupled model to
relieve the Hubble tens... |
A Detection of $z$~2.3 Cosmic Voids from 3D Lyman-$α$ Forest
Tomography in the COSMOS Field: We present the most distant detection of cosmic voids ($z \sim 2.3$) and the
first detection of three-dimensional voids in the Lyman-$\alpha$ forest. We
used a 3D tomographic map of the absorption with effective comoving spat... | Loops abound in the cosmic microwave background: A $4σ$ anomaly on
super-horizon scales: We present a topological analysis of the temperature fluctuation maps from
the \emph{Planck 2020} Data release 4 (DR4) based on the \texttt{NPIPE} data
processing pipeline. For comparison, we also present the topological
characte... |
Understanding caustic crossings in giant arcs: characteristic scales,
event rates, and constraints on compact dark matter: The recent discovery of fast transient events near critical curves of massive
galaxy clusters, which are interpreted as highly magnified individual stars in
giant arcs due to caustic crossing, op... | New Light on Dark Extended Lenses with the Roman Space Telescope: The Roman Space Telescope's Galactic Bulge Time Domain Survey will constitute
the most sensitive microlensing survey of the Galactic Bulge to date, opening
up new opportunities to search for dark matter (DM). Many extensions of the
Standard Model predict... |
When Is Secular Evolution Important?: This abstract has been withdrawn. The proper replacement is arXiv:0909.3306 | Statistical hierarchy of varying speed of light cosmologies: Variation of the speed of light is quite a debated issue in cosmology with
some benefits, but also with some controversial concerns. Many approaches to
develop a consistent varying speed of light (VSL) theory have been developed
recently. Although a lot of th... |
Subhaloes in Self-Interacting Galactic Dark Matter Haloes: We present N-body simulations of a new class of self-interacting dark matter
models, which do not violate any astrophysical constraints due to a
non-power-law velocity dependence of the transfer cross section which is
motivated by a Yukawa-like new gauge boson ... | Precise limits on cosmological variability of the fine-structure
constant with zinc and chromium quasar absorption lines: The strongest transitions of Zn and CrII are the most sensitive to relative
variations in the fine-structure constant ($\Delta\alpha/\alpha$) among the
transitions commonly observed in quasar abso... |
Probing the Dawn of Galaxies at z~9-12: New Constraints from HUDF12/XDF
and CANDELS Data: We present a comprehensive analysis of z>8 galaxies based on ultra-deep
WFC3/IR data. We constrain the evolution of the UV luminosity function (LF) and
luminosity densities from z~11 to z~8 by exploiting all the WFC3/IR data ove... | The Mid-IR Contribution Of Dust Enshrouded Stars In Six Nearby Galaxies: We measure the integrated contributions of dusty AGB stars and other luminous
red mid-IR sources to the mid-IR luminosities of 6 galaxies (M81, NGC 2403, NGC
300, M33 and the Magellanic Clouds). We find the dusty AGB stars whose mid-IR
fluxes are ... |
Observational Constraints on Monomial Warm Inflation: Warm inflation is, as of today, one of the best motivated mechanisms for
explaining an early inflationary period. In this paper, we derive and analyze
the current bounds on warm inflation with a monomial potential $U\propto
\phi^p$, using the constraints from the PL... | Solar Mass Primordial Black Holes in Moduli Dominated Universe: We explore the prospect of producing primordial black holes around the solar
mass region during an early matter domination epoch. The early matter-dominated
epoch can arise when a moduli field comes to dominate the energy density of the
Universe prior to b... |
Warm dark matter signatures on the 21cm power spectrum: Intensity
mapping forecasts for SKA: We investigate the impact that warm dark matter (WDM) has in terms of 21cm
intensity mapping in the post-reionization Universe at z = 3 - 5. We perform
hydrodynamic simulations for 5 different models: cold dark matter and WDM... | By Dawn's Early Light: CMB Polarization Impact on Cosmological
Constraints: Cosmic microwave background polarization encodes information not only on the
early universe but also dark energy, neutrino mass, and gravity in the late
universe through CMB lensing. Ground based surveys such as ACTpol, PolarBear,
SPTpol sign... |
Large-scale magnetic fields, non-Gaussianity, and gravitational waves
from inflation: We explore the generation of large-scale magnetic fields in the so-called
moduli inflation. The hypercharge electromagnetic fields couple to not only a
scalar field but also a pseudoscalar one, so that the conformal invariance of
th... | Dark energy by natural evolution: Constraining dark energy using
Approximate Bayesian Computation: We look at dark energy from a biology inspired viewpoint by means of the
Approximate Bayesian Computation (ABC) and late time cosmological observations.
We find that dynamical dark energy comes out on top, or in the ABC... |
The star cluster frequency throughout the Large Magellanic Cloud: We address the issue about the variation of the star cluster frequency (CF)
in the Large Magellanic Cloud (LMC) in terms of the cluster spatial
distribution. We adopted the LMC regions traced by Harris & Zaritsky (2009) and
used an updated version of the... | What is the physical origin of strong Lya emission? II. Gas Kinematics
and Distribution of Lya Emitters: We present a statistical study of velocities of Lya, interstellar (IS)
absorption, and nebular lines and gas covering fraction for Lya emitters (LAEs)
at z~2. We make a sample of 22 LAEs with a large Lya equivalen... |
Potentialities of Hubble parameter and expansion rate function data to
alleviate Hubble tension: Taking advantage of Gaussian process (GP), we obtain an improved estimate of
the Hubble constant, $H_0=70.41\pm1.58$ km s$^{-1}$ Mpc$^{-1}$, using Hubble
parameter [$H(z)$] from cosmic chronometers (CCH) and expansion rat... | Radial derivatives as a test of pre-Big-Bang events on the Planck data: Although the search for azimutal patterns in cosmological surveys is useful
to characterise some effects depending exclusively on an angular distance
within the standard model, they are considered as a key distinguishing feature
of some exotic scen... |
Intensity mapping of the 21cm emission: lensing: In this paper, we study lensing of 21cm intensity mapping (IM). Like in the
cosmic microwave background (CMB), there is no first order lensing in intensity
mapping. The first effects in the power spectrum are therefore of second and
third order. Despite this, lensing of ... | A Search for Optical Variability of Type 2 Quasars in SDSS Stripe 82: Hundreds of Type 2 quasars have been identified in Sloan Digital Sky Survey
(SDSS) data, and there is substantial evidence that they are generally galaxies
with highly obscured central engines, in accord with unified models for active
galactic nuclei... |
Impact of Image Persistence in the Roman Space Telescope High-Latitude
Survey: The High Latitude Survey of the Nancy Grace Roman Space Telescope is expected
to measure the positions and shapes of hundreds of millions of galaxies in an
area of 2220 deg$^2$. This survey will provide high-quality weak lensing data
with ... | Bayesian large-scale structure inference and cosmic web analysis: Surveys of the cosmic large-scale structure carry opportunities for building
and testing cosmological theories about the origin and evolution of the
Universe. This endeavor requires appropriate data assimilation tools, for
establishing the contact betwee... |
Parity violation of primordial magnetic fields in the CMB bispectrum: We study the parity violation in the cosmic microwave background (CMB)
bispectrum induced by primordial magnetic fields (PMFs). Deriving a general
formula for the CMB bispectrum generated from not only non-helical but also
helical PMFs, we find that ... | Moving mesh cosmology: properties of neutral hydrogen in absorption: We examine the distribution of neutral hydrogen in cosmological simulations
carried out with the new moving-mesh code AREPO and compare it with the
corresponding GADGET simulations based on the smoothed particle hydrodynamics
(SPH) technique. The two ... |
Baryon Acoustic Oscillations in the Lyman Alpha Forest: We use hydrodynamic cosmological simulations in a (600 Mpc)^3 volume to study
the observability of baryon acoustic oscillations (BAO) in the intergalactic
medium as probed by Lyman alpha forest (LAF) absorption. The large scale
separation between the wavelength of... | Cosmological forecast of the 21-cm power spectrum using the halo model
of reionization: The 21-cm power spectrum of reionization is a promising probe for cosmology
and fundamental physics. Exploiting this new observable, however, requires fast
predictors capable of efficiently scanning the very large parameter space ... |
The PAU Survey: narrowband photometric redshifts using Gaussian
processes: We study the performance of the hybrid template-machine-learning photometric
redshift (photo-$z$) algorithm Delight, which uses Gaussian processes, on a
subset of the early data release of the Physics of the Accelerating Universe
Survey (PAUS)... | Stellar Populations of Lyman Alpha Emitters at z~6-7: Constraints on the
Escape Fraction of Ionizing Photons from Galaxy Building Blocks: We investigate the stellar populations of Lyman alpha emitters (LAEs) at
z=5.7 and 6.6 in a 0.65 deg^2 sky of the Subaru/XMM-Newton Deep Survey (SXDS)
Field, using deep images take... |
O-V-S-Z and friends: Non-Gaussianity from inhomogeneous reionization: We calculate the cosmic microwave background (CMB) bispectrum due to
inhomogeneous reionization. We calculate all the terms that can contribute to
the bispectrum that are products of first order terms on all scales in
conformal Newtonian gauge. We al... | Scalar-Tensor Gravity Cosmology: Noether symmetries and analytical
solutions: In this paper, we present a complete Noether Symmetry analysis in the
framework of scalar-tensor cosmology. Specifically, we consider a non-minimally
coupled scalar field action embedded in the FLRW spacetime and provide a full
set of Noeth... |
The Diversity of Core Halo Structure in the Fuzzy Dark Matter Model: In the fuzzy dark matter (FDM) model, gravitationally collapsed objects
always consist of a solitonic core located within a virialised halo. Although
various numerical simulations have confirmed that the collapsed structure can
be described by a cored... | Modified gravity in Arnowitt-Deser-Misner formalism: Motivated by Horava-Lifshitz gravity theory, we propose and investigate two
kinds of modified gravity theories, the f(R) kind and the K-essence kind, in
the Arnowitt-Deser-Misner (ADM) formalism. The f(R) kind includes one
ultraviolet (UV) term and one infrared (IR) ... |
Evolution of the Sizes of Galaxies over 7<z<12 Revealed by the 2012
Hubble Ultra Deep Field Campaign: We analyze the redshift- and luminosity-dependent sizes of dropout galaxy
candidates in the redshift range z~7-12 using deep images from the UDF12
campaign, data which offers two distinct advantages over that used in... | Insights into neutrino decoupling gleaned from considerations of the
role of electron mass: We present calculations showing how electron rest mass influences entropy
flow, neutrino decoupling, and Big Bang Nucleosynthesis (BBN) in the early
universe. To elucidate this physics and especially the sensitivity of BBN and... |
Constraining the distance to inspiralling NS-NS with Einstein Telescope: Einstein Telescope (ET) is a planned third generation gravitational waves
detector located in Europe. Its design will be different from currently build
interferometers, because ET will consist of three interferometers rotated by a
60 deg with resp... | On the Use of Ly-alpha Emitters as Probes of Reionization: We use numerical simulations to study the effects of the patchiness of a
partly reionized intergalactic medium (IGM) on the observability of Ly-alpha
emitters (LAEs) at high redshifts (z ~ 6). We present a new model that divides
the Ly-alpha radiative transfer ... |
Determining accurate measurements of the growth rate from the galaxy
correlation function in simulations: We use high-resolution N-body simulations to develop a new, flexible,
empirical approach for measuring the growth rate from redshift-space
distortions (RSD) in the 2-point galaxy correlation function. We quantify... | Viscous Self Interacting Dark Matter and Cosmic Acceleration: Self interacting dark matter (SIDM) provides us with a consistent solution to
certain astrophysical observations in conflict with collision-less cold DM
paradigm. In this work we estimate the shear viscosity $(\eta)$ and bulk
viscosity $(\zeta)$ of SIDM, wit... |
A "Light," Centrally-Concentrated Milky Way Halo?: We discuss a novel approach to "weighing" the Milky Way dark matter halo, one
that combines the latest samples of halo stars selected from the Sloan Digital
Sky Survey (SDSS) with state-of-the-art numerical simulations of Milky Way
analogs. The fully cosmological runs ... | Thermal blocking of preheating: The parametric resonance responsible for preheating after inflation will end
when self-interactions of the resonating field and interactions of this field
with secondary degrees of freedom become important. In many cases, the effect
may be quantified in terms of an effective mass and the... |
Cosmological Constraints from the double source plane lens
SDSSJ0946+1006: We present constraints on the equation of state of dark energy, $w$, and the
total matter density, $\Omega_{\mathrm{M}}$, derived from the
double-source-plane strong lens SDSSJ0946+1006, the first cosmological
measurement with a galaxy-scale d... | Do blue galaxy-clusters have hot intracluster gas?: We present herein a systematic X-ray analysis of blue galaxy-clusters at
$z=0.84$ discovered by the Subaru telescope. The sample consisted of 43
clusters identified by combining red-sequence and blue-cloud surveys, covering
a wide range of emitter fractions (i.e., 0.3... |
The puzzling radio source in the cool core cluster A 2626: We report on new VLA radio observations performed at 1.4 GHz and 4.8 GHz with
unprecedented sensitivity and angular resolution (~1 arcsec) of the cool core
cluster A 2626, which is known to possess a radio mini-halo at its center. The
most unusual features of A... | Scale dependence of the power spectrum of the curvature perturbation
determined using a numerical method in slow-roll inflation: The Taylor expansion method has been used to investigate the scale dependence
of the power spectrum of the curvature perturbation. In the present study, an
alternative numerical method is u... |
Cosmic Microwave Background Spectral Distortions from Cosmic String
Loops: Cosmic string loops contain cusps which decay by emitting bursts of
particles. A significant fraction of the released energy is in the form of
photons. These photons are injected non-thermally and can hence cause spectral
distortions of the Co... | Characterizing EoR foregrounds: A study of the Lockman Hole Region at
325 MHz: One of the key science goals for the most sensitive telescopes, both current
and upcoming, is the detection of the redshifted 21-cm signal from the Cosmic
Dawn and Epoch of Reionization. The success of detection relies on accurate
foregrou... |
Cross-tests of CMB features in the primordial spectra: The recent Planck data on the power spectrum of temperature anisotropies of
the cosmic microwave background marginally support deviations from the
$\Lambda$CDM model at several multipoles. With a view towards current and
forthcoming observational surveys, we trace ... | Possibility of realizing weak gravity in redshift space distortion
measurements: We study the possibility of realizing a growth rate of matter density
perturbations lower than that in General Relativity. Using the approach of the
effective field theory of modified gravity encompassing theories beyond
Horndeski, we de... |
The angular power spectrum measurement of the Galactic synchrotron
emission in two fields of the TGSS survey: Characterizing the diffuse Galactic synchrotron emission at arcminute angular
scales is needed to reliably remove foregrounds in cosmological 21-cm
measurements. The study of this emission is also interesting... | High-redshift JWST Observations and Primordial Non-Gaussianity: Several bright and massive galaxy candidates at high redshifts have been
recently observed by the James Webb Space Telescope. Such early massive
galaxies seem difficult to reconcile with standard $\Lambda$ Cold Dark Matter
model predictions. We discuss und... |
Component separation for future CMB B-mode satellites: Next-generation CMB satellite concepts (LiteBIRD, CORE, PIXIE, PICO) are
being proposed to detect the primordial CMB B-mode polarization at large
angular scales in the sky for tensor-to-scalar ratio values of ${r \lesssim
10^{-3}}$. Yet undetected, primordial CMB B... | AGN feedback works both ways: Simulations of galaxy growth need to invoke strong negative feedback from
active galactic nuclei (AGN) to suppress the formation of stars and thus
prevent the over-production of very massive systems. While some observations
provide evidence for such negative feedback, other studies find ei... |
Using peculiar velocity surveys to constrain the growth rate of
structure with the wide-angle effect: Amongst the most popular explanations for dark energy are modified theories
of gravity. The galaxy overdensity and peculiar velocity fields help us to
constrain the growth rate of structure and distinguish different ... | Interacting modified holographic Ricci dark energy model and statefinder
diagnosis in flat universe: In this work we have considered the modified holographic Ricci dark energy
interacting with dark matter through a non-gravitational coupling. We took
three phenomenological forms for the interaction term $Q$ in the mo... |
DEMNUni: Massive neutrinos and the bispectrum of large scale structures: The main effect of massive neutrinos on the large-scale structure consists in
a few percent suppression of matter perturbations on all scales below their
free-streaming scale. Such effect is of particular importance as it allows to
constraint the ... | Variability in Quasar Broad Absorption Line Outflows: Broad absorption lines (BALs) in quasar spectra identify high velocity
outflows that likely exist in all quasars and could play a major role in
feedback to galaxy evolution. Studying the variability in these BALs can help
us understand the structure, evolution, and ... |
Polarization of the Cosmic Infrared Background Fluctuations: The cosmic infrared background (CIB) is slightly polarized. Polarization
directions of individual galaxies could be aligned with tidal fields around
galaxies, resulting in nonzero CIB polarization. We use a linear intrinsic
alignment model to theoretically pr... | Probing the First Stars and Black Holes in the Early Universe with the
Dark Ages Radio Explorer (DARE): A concept for a new space-based cosmology mission called the Dark Ages Radio
Explore (DARE) is presented in this paper. DARE's science objectives include
(1) When did the first stars form? (2) When did the first ac... |
KAT-7 Science Verification: Using HI Observations of NGC 3109 to
Understand its Kinematics and Mass Distribution: HI observations of the Magellanic-type spiral NGC 3109, obtained with the
seven dish Karoo Array Telescope (KAT-7), are used to analyze its mass
distribution. Our results are compared to what is obtained ... | Predicted properties of multiple images of the strongly lensed supernova
SN Refsdal: We construct a mass model of the cluster MACS J1149.6+2223 to study the
expected properties of multiple images of SN Refsdal, the first example of a
gravitationally lensed supernova with resolved multiple images recently
reported by ... |
Hybrid SBI or How I Learned to Stop Worrying and Learn the Likelihood: We propose a new framework for the analysis of current and future
cosmological surveys, which combines perturbative methods (PT) on large scales
with conditional simulation-based implicit inference (SBI) on small scales.
This enables modeling of a w... | Evidence of Gunn-Peterson damping wings in high-z quasar spectra:
strengthening the case for incomplete reionization: The spectra of several high-redshift (z>6) quasars have shown evidence for a
Gunn-Peterson (GP) damping wing, indicating a substantial mean neutral hydrogen
fraction (x_HI > 0.03) in the z ~ 6 interga... |
A comparison of the excess mass around CFHTLenS galaxy-pairs to
predictions from a semi-analytic model using galaxy-galaxy-galaxy lensing: The matter environment of galaxies is connected to the physics of galaxy
formation and evolution. Utilising galaxy-galaxy-galaxy lensing as a direct
probe, we map out the distribu... | On Separate Universes: (abridged version) The separate universe conjecture states that in General
Relativity a density perturbation behaves locally (i.e. on scales much smaller
than the wavelength of the mode) as a separate universe with different
background density and curvature. We prove this conjecture for a spheric... |
Subaru medium-resolution spectra of a QSO at z=6.62: Three reionization
tests: Investigating the Gunn-Peterson trough of high redshift quasars (QSOs) is a
powerful way to reveal the cosmic reionization. As one of such attempts, we
perform a series of analyses to examine the absorption lines observed with one
of the h... | The physical scale of the far-infrared emission in the most luminous
submillimetre galaxies II: evidence for merger-driven star formation: We present high-resolution 345 GHz interferometric observations of two
extreme luminous (L_{IR}>10^{13} L_sun), submillimetre-selected galaxies (SMGs)
in the COSMOS field with the... |
Unlocking the secrets of stellar haloes using combined star counts and
surface photometry: The stellar haloes of galaxies can currently be studied either through
observations of resolved halo stars or through surface photometry. Curiously,
the two methods appear to give conflicting results, as a number of surface
pho... | Dust-obscured star-formation in the outskirts of XMMU J2235.3-2557, a
massive galaxy cluster at z=1.4: Star-formation in the galaxy populations of local massive clusters is reduced
with respect to field galaxies, and tends to be suppressed in the core region.
Indications of a reversal of the star-formation--density r... |
Low-mass stars within dense dark matter halos: We studied the formation and evolution of low-mass stars within halos with
high concentration of dark matter (DM) particles, using a highly sophisticated
expression to calculate the rate at which DM particles are captured inside the
star. For very high DM densities in the ... | Testing isotropy in the Two Micron All-Sky redshift survey with
information entropy: We use information entropy to test the isotropy in the nearby galaxy
distribution mapped by the Two Micron All-Sky redshift survey (2MRS). We find
that the galaxy distribution is highly anisotropic on small scales. The radial
anisotr... |
Can residuals of the Solar system foreground explain low multipole
anomalies of the CMB ?: The low multipole anomalies of the Cosmic Microwave Background has received
much attention during the last few years. It is still not ascertained whether
these anomalies are indeed primordial or the result of systematics or
for... | Testing Dark Energy Models with Gamma-Ray Bursts Calibrated from the
Observational $H(z)$ Data through a Gaussian Process: We use a cosmology-independent method to calibrate gamma-ray burst (GRB) from
the observational Hubble data (OHD) with the cosmic chronometers method. By
using Gaussian Process to reconstruct OHD... |
Even Lighter Particle Dark Matter: We report on recent progress in the search for dark matter particles with
masses from 1 MeV to 1 GeV. Several dark matter candidates in this mass range
are expected to generate measurable electronic-recoil signals in
direct-detection experiments. We focus on dark matter particles scat... | The cosmology dependence of the concentration-mass-redshift relation: The concentrations of dark matter haloes provide crucial information about
their internal structure and how it depends on mass and redshift -- the
so-called concentration-mass-redshift relation, denoted $c(M,z)$. We present
here an extensive study of... |
An Oxygen Abundance Gradient into the Outer Disk of M81: The extended HI disk and tidal tails of M81 present an interesting
environment to study the effects of galaxy interaction on star formation and
chemical evolution of the outer disk of a large spiral galaxy. We present
H{\alpha} imaging of the outer disk of M81 an... | Cosmic Filament Spin from Dark Matter Vortices: The recent observational evidence for cosmic filament spin on megaparsec
scales (Wang et al, Nature Astronomy 5, 839-845 (2021)) demands an explanation
in the physics of dark matter. Conventional collisionless cold particle dark
matter is conjectured to generate cosmic fi... |
Can Light Dark Matter Solve the Core-Cusp Problem?: Recently there has been much interest in light dark matter, especially
ultra-light axions, as they may provide a solution to the core-cusp problem at
the center of galaxies. Since very light bosons can have a de Broglie
wavelength that is of astrophysical size, they c... | Are Scalar and Tensor Deviations Related in Modified Gravity?: Modified gravity theories on cosmic scales have three key deviations from
general relativity. They can cause cosmic acceleration without a physical,
highly negative pressure fluid, can cause a gravitational slip between the two
metric potentials, and can ca... |
Modeling quasar accretion disc temperature profiles: Microlensing observations indicate that quasar accretion discs have
half-light radii larger than expected from standard theoretical predictions
based on quasar fluxes or black hole masses. Blackburne and colleagues have
also found a very weak wavelength dependence of... | Constraining gravity with synergies between radio and optical
cosmological surveys: In this work we present updated forecasts on parameterised modifications of
gravity that can capture deviations of the behaviour of cosmological density
perturbations beyond $\Lambda$CDM. For these forecasts we adopt the SKA
Observato... |
SN 2003bg: The First Type IIb Hypernova: Optical and near-infrared photometry and optical spectroscopy are reported
for SN 2003bg, starting a few days after explosion and extending for a period
of more than 300 days. Our early-time spectra reveal the presence of broad,
high-velocity Balmer lines. The nebular-phase spec... | Inhomogeneous cosmological models and $H_0$ observations: We address some recent erroneous claim that $H_0$ observations are difficult
to accommodate with LTB cosmological models, showing how to construct solutions
in agreement with an arbitrary value of $H_0$ by re-writing the exact solution
in terms of dimensionless ... |
Standard candles and sirens rescue $H_0$: We show that future observations of binary neutron star systems with
electromagnetic counterparts together with the traditional probes of low- and
high-redshift Type Ia supernovae (SNe Ia) can help resolve the Hubble tension.
The luminosity distance inferred from these probes a... | Weak lensing in non-statistically isotropic universes: The Bipolar Spherical Harmonics (BipoSH) form a natural basis to study the
CMB two point correlation function in a non-statistically isotropic (non-SI)
universe. The coefficients of expansion in this basis are a generalisation of
the well known CMB angular power sp... |
On the Stellar Populations and Evolution of Star-Forming Galaxies at 6.3
< z < 8.6: We study the physical characteristics of galaxies at 6.3 < z < 8.6, selected
from deep near-infrared imaging with the Wide Field Camera 3 (WFC3) on board
the Hubble Space Telescope. Accounting for the photometric scatter using
simulat... | Graviton non-Gaussianities and Parity Violation in the EFT of Inflation: We study graviton non-Gaussianities in the EFT of Inflation. At leading
(second) order in derivatives, the graviton bispectrum is fixed by Einstein
gravity. There are only two contributions at third order. One of them breaks
parity. They come from... |
Galaxy clustering in the NEWFIRM Medium Band Survey: the relationship
between stellar mass and dark matter halo mass at 1 < z < 2: We present an analysis of the clustering of galaxies as a function of their
stellar mass at 1 < z < 2 using data from the NEWFIRM Medium Band Survey
(NMBS). The precise photometric redshi... | The massive elliptical galaxy NGC 4649 from the perspective of extended
gravity: Elliptical galaxies are systems where dark matter is usually less necessary
to explain observed dynamics than in the case of spiral galaxies, however there
are some instances where Newtonian gravity and the observable mass are
insufficie... |
Improving initialization and evolution accuracy of cosmological neutrino
simulations: Neutrino mass constraints are a primary focus of current and future
large-scale structure (LSS) surveys. Non-linear LSS models rely heavily on
cosmological simulations -- the impact of massive neutrinos should therefore be
included ... | Connecting stellar mass and star-formation rate to dark matter halo mass
out to z ~ 2: We have constructed an extended halo model (EHM) which relates the total
stellar mass and star-formation rate (SFR) to halo mass (M_h). An empirical
relation between the distribution functions of total stellar mass of galaxies
and ... |
The Survey of Extragalactic Nuclear Spectral Energies: We present the first results from the new Survey of Extragalactic Nuclear
Spectral Energies (SENSE) sample of "blazars". The sample has been chosen with
minimal selection effects and is therefore ideal to probe the intrinsic
properties of the blazar population. We ... | Holographic Ricci dark energy: Current observational constraints,
quintom feature, and the reconstruction of scalar-field dark energy: In this work, we consider the cosmological constraints on the holographic
Ricci dark energy proposed by Gao et al. [Phys. Rev. D 79, 043511 (2009)], by
using the observational data cu... |
A measurement of galaxy halo mass from the surrounding HI Lyα
absorption: We measure the dark matter halo masses of z~2.36 UV color-selected
star-forming galaxies by matching the observed median HI Ly{\alpha} absorption
around them, as observed in the spectra of background QSOs, to the absorption
around haloes above ... | Constraining high-redshift stellar-mass primordial black holes with
next-generation ground-based gravitational-wave detectors: The possible existence of primordial black holes in the stellar mass window
has received considerable attention because their mergers may contribute to
current and future gravitational-wave d... |
The angular momentum of baryons and dark matter halos revisited: Recent theoretical studies have shown that galaxies at high redshift are fed
by cold, dense gas filaments, suggesting angular momentum transport by gas
differs from that by dark matter. Revisiting this issue using high-resolution
cosmological hydrodynamic... | Evolution of the Fundamental Plane of 0.2<z<1.2 Early-type galaxies in
the EGS: The Fundamental Plane relates the structural properties of early-type
galaxies such as its surface brightness and effective radius with its dynamics.
The study of its evolution has therefore important implications for models of
galaxy for... |
The Linear Growth of Structure in the R_h=ct Universe: We use recently published redshift space distortion measurements of the
cosmological growth rate, f sigma_8(z), to examine whether the linear evolution
of perturbations in the R_h=ct cosmology is consistent with the observed
development of large scale structure. We... | Oscillon formation from preheating in asymmetric inflationary potentials: We investigate the possibility of oscillon formation during the preheating
phase of asymmetric inflationary potentials. We analytically establish the
existence of oscillon-like solutions for the Klein-Gordon equation for a
polynomial potential of... |
The source counts of submillimetre galaxies detected at 1.1 mm: The source counts of galaxies discovered at sub-millimetre and millimetre
wavelengths provide important information on the evolution of infrared-bright
galaxies. We combine the data from six blank-field surveys carried out at 1.1
mm with AzTEC, totalling 1... | A hydrodynamical halo model for weak-lensing cross correlations: On the scale of galactic haloes, the distribution of matter in the cosmos is
affected by energetic, non-gravitational processes; so-called baryonic
feedback. A lack of knowledge about the details of how feedback processes
redistribute matter is a source o... |
Observational constraints on dark matter scattering with electrons: We present new observational constraints on the elastic scattering of dark
matter with electrons for dark matter masses between 10 keV and 1 TeV. We
consider scenarios in which the momentum-transfer cross section has a power-law
dependence on the relat... | A practical guide to the massive black hole cosmic history: I review our current understanding of massive black hole (MBH) formation and
evolution along the cosmic history. After a brief introductory overview of the
relevance of MBHs in the hierarchical structure formation paradigm, I discuss
the main viable channels f... |
Continuous matter creation and the acceleration of the universe: a
replay: In a recent note (arXiv:1012.5069), the investigation performed by the
present authors on the evolution of density fluctuations in an accelerated
universe including matter creation was criticized. The criticism is based on
the fact that the Ne... | Double inflation via non-minimally coupled spectator: We argue that double inflation may occur when a spectator field is
non-minimally coupled to gravity. As a concrete example, we study a two-field
inflationary model where the initial spectator field is non-minimally coupled
to gravity while the initial inflaton field... |
Gravitational Stability of Vortices in Bose-Einstein Condensate Dark
Matter: We investigate a simple model for a galactic halo under the assumption that
it is dominated by a dark matter component in the form of a Bose-Einstein
condensate involving an ultra-light scalar particle. In particular we discuss
the possibili... | Galaxy power spectrum and biasing results from the LOFAR Two-metre Sky
Survey (first data release): The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing survey aiming to observe
the entire Northern sky, providing an excellent opportunity to study the
distribution and evolution of the large-scale structure of the Univ... |
Helical magnetic fields in the M87 jet at arc-second scales: We investigate the magnetic field configuration of the M87 jet at arc-second
scales by using archival polarimetric VLA data at 8, 15, 22 and 43 GHz. By
stacking images over three years in order to enhance the sensitivity, we
reveal, for the first time, system... | WEAVE-QSO: A Massive Intergalactic Medium Survey for the William
Herschel Telescope: In these proceedings we describe the WEAVE-QSO survey, which will observe
around 400,000 high redshift quasars starting in 2018. This survey is part of a
broader WEAVE survey to be conducted at the 4.2m William Herschel Telescope. We... |
The Dark Energy Survey 5-year photometrically identified Type Ia
Supernovae: As part of the cosmology analysis using Type Ia Supernovae (SN Ia) in the
Dark Energy Survey (DES), we present photometrically identified SN Ia samples
using multi-band light-curves and host galaxy redshifts. For this analysis, we
use the ph... | Cosmological parameter estimation with future gravitational wave
standard siren observation from the Einstein Telescope: In this work, we use the simulated gravitational wave (GW) standard siren
data from the future observation of the Einstein Telescope (ET) to constrain
various dark energy cosmological models, inclu... |
Prospects for measuring the relative velocities of galaxy clusters in
photometric surveys using the kinetic Sunyaev-Zel'dovich Effect: We consider the prospects for measuring the pairwise kinetic
Sunyaev-Zel'dovich (kSZ) signal from galaxy clusters discovered in large
photometric surveys such as the Dark Energy Surve... | COSMOS: Stochastic bias from measurements of weak lensing and galaxy
clustering: In the theory of structure formation, galaxies are biased tracers of the
underlying matter density field. The statistical relation between galaxy and
matter density field is commonly referred as galaxy bias. In this paper, we
test the li... |
Localised HI 21-cm absorption towards a double-lobed z=0.24 radio galaxy: We present the results of a mini-survey for associated HI 21-cm absorption at
z < 0.42 with the Giant Metrewave Radio Telescope. Our targets are radio
galaxies, selected on the basis that the 1216 Angstrom luminosities are below
10^23 W/Hz, above... | Gas Sloshing and Radio Galaxy Dynamics in the Core of the 3C449 Group: We present results from a 140 ks Chandra/ACIS-S observation of the hot gas
around the canonical FR I radio galaxy 3C 449. An earlier, shorter 30 ks
Chandra observation of the group gas showed an unusual entropy distribution and
a surface brightness ... |
Generic inference of inflation models by non-Gaussianity and primordial
power spectrum reconstruction: We present a generic inference method for inflation models from observational
data by the usage of higher-order statistics of the curvature perturbation on
uniform density hypersurfaces. This method is based on the ... | Integrated Cosmological Probes: Extended Analysis: Recent progress in cosmology has relied on combining different cosmological
probes. In earlier work, we implemented an integrated approach to cosmology
where the probes are combined into a common framework at the map level. This
has the advantage of taking full account... |
Flat-Sky Pseudo-Cls Analysis for Weak Gravitational Lensing: We investigate the use of estimators of weak lensing power spectra based on a
flat-sky implementation of the Pseudo-Cl (PCl) technique, where the masked
shear field is transformed without regard for masked regions of sky. This
masking mixes power, and E-conve... | DBI Galileon and Late time acceleration of the universe: We consider 1+3 dimensional maximally symmetric Minkowski brane embedded in a
1+4 dimensional maximally symmetric Minkowski background. The resulting 1+3
dimensional effective field theory is of DBI (Dirac-Born-Infeld) Galileon type.
We use this model to study th... |
Galaxy Infall Kinematics as a Test of Modified Gravity: Infrared modifications of General Relativity (GR) can be revealed by
comparing the mass of galaxy clusters estimated from weak lensing to that from
infall kinematics. We measure the 2D galaxy velocity distribution in the
cluster infall region by applying the galax... | Flow-Based Likelihoods for Non-Gaussian Inference: We investigate the use of data-driven likelihoods to bypass a key assumption
made in many scientific analyses, which is that the true likelihood of the data
is Gaussian. In particular, we suggest using the optimization targets of
flow-based generative models, a class o... |
A Keck/DEIMOS spectroscopic survey of the faint M31 satellites And IX,
And XI, And XII, and And XIII: We present the first spectroscopic analysis of the faint M31 satellite
galaxies, AndXI and AndXIII, and a reanalysis of existing spectroscopic data
for two further faint companions, And IX and AndXII. By combining da... | Density perturbations for running vacuum: a successful approach to
structure formation and to the $σ_8$-tension: Recent studies suggest that dynamical dark energy (DDE) provides a better fit
to the rising affluence of modern cosmological observations than the
concordance model ($\Lambda$CDM) with a rigid cosmological... |
Accurate modelling of the Lyman-$α$ coupling for the 21-cm signal,
observability with NenuFAR and SKA: The measurement of the $21$ cm signal from the Cosmic Dawn is a major goal
for several existing and upcoming radio interferometers such as NenuFAR and the
SKA. During this era before the beginning of the Epoch of Re... | Long Gamma-Ray Burst Host Galaxies and their Environments: In this book-chapter we first briefly discuss some basic observational issues
related to what a GRB host galaxy is (whether they are operationally well
defined as a class) and sample completeness. We then describe some of the early
studies of GRB hosts starting... |
Determining dust temperatures and masses in the Herschel era: the
importance of observations longward of 200 micron: The properties of the dust grains (e.g., temperature and mass) can be derived
from fitting far-IR SEDs (>100 micron). Only with SPIRE on Herschel has it been
possible to get high spatial resolution at ... | Subhalo effective density slope measurements from HST strong lensing
data with neural likelihood-ratio estimation: Examining the properties of subhalos with strong gravitational lensing images
can shed light on the nature of dark matter. From upcoming large-scale surveys,
we expect to discover orders of magnitude mor... |
Multicolour-metallicity Relations from Globular Clusters in NGC 4486
(M87): We present Gemini griz photometry for 521 globular cluster (GC) candidates in
a 5.5 x 5.5 arcmin field centered 3.8 arcmin to the south and 0.9 arcmin to the
west of the center of the giant elliptical galaxy NGC 4486. All these objects
have p... | Does the Hubble constant tension call for new physics?: The $\Lambda$ Cold Dark Matter model ($\Lambda$CDM) represents the current
standard model in cosmology. Within this, there is a tension between the value
of the Hubble constant, $H_0$, inferred from local distance indicators and the
angular scale of fluctuations i... |
Small-scale systems of galaxies. IV. Searching for the faint galaxy
population associated with X-ray detected isolated E+S pairs: In hierarchical evolutionary scenarios, isolated, physical pairs may
represent an intermediate phase, or "way station", between collapsing groups
and isolated elliptical (E) galaxies (or f... | A novel variability-based method for quasar selection: evidence for a
rest frame ~54 day characteristic timescale: We compare quasar selection techniques based on their optical variability
using data from the Catalina Real-time Transient Survey (CRTS). We introduce a
new technique based on Slepian wavelet variance (S... |
Superdense Massive Galaxies in Wings Local Clusters: Massive quiescent galaxies at z>1 have been found to have small physical
sizes, hence to be superdense. Several mechanisms, including minor mergers,
have been proposed for increasing galaxy sizes from high- to low-z. We search
for superdense massive galaxies in the W... | Einstein's legacy in galaxy surveys: Non-Gaussianity in the primordial fluctuations that seeded structure
formation produces a signal in the galaxy power spectrum on very large scales.
This signal contains vital information about the primordial Universe, but it is
very challenging to extract, because of cosmic variance... |
Damped Lyman-alpha absorbers as a probe of stellar feedback: We examine the abundance, clustering and metallicity of Damped Lyman-alpha
Absorbers (DLAs) in a suite of hydrodynamic cosmological simulations using the
moving mesh code AREPO. We incorporate models of supernova and AGN feedback, as
well as molecular hydroge... | One-Dimensional Fuzzy Dark Matter Models: Structure Growth and
Asymptotic Dynamics: This paper investigates the feasibility of simulating Fuzzy Dark Matter (FDM)
with a reduced number of spatial dimensions. Our aim is to set up a realistic,
yet numerically inexpensive, toy model in $(1+1)$-dimensional space time, tha... |
Statistical Properties of Multi-epoch Spectral Variability of SDSS
Stripe82 Quasars: We investigate the UV-optical (longward of Ly$\alpha$ 1216\AA) spectral
variability of nearly 9000 quasars ($0<z<4$) using multi-epoch photometric data
within the SDSS Stripe 82 region. The regression slope in the flux-flux space
of ... | Gravitational waves from bubble collisions: analytic derivation: We consider gravitational wave production by bubble collisions during a
cosmological first-order phase transition. In the literature, such spectra have
been estimated by simulating the bubble dynamics, under so-called thin-wall and
envelope approximations... |
LBQS 0103-2753: A Binary Quasar in a Major Merger: We present HST and UKIRT spectra and images of the 2 kpc binary quasar LBQS
0103-2753 (z=0.858). The HST images (V- and I-band) show tidal features
demonstrating that this system is a major galaxy merger in progress. A
two-color composite image brings out knots of star... | $α$ attractors in Quintessential Inflation motivated by
Supergravity: An exponential kind of quintessential inflation potential motivated by
supergravity is studied. This type belongs to the class of {\alpha}-attractor
models. The model was studied for the first time by Dimopoulos and Owen in [J.
Cosmol. Astropart. P... |
Dynamics of Scalar Field Dark Matter With a Cosh-like Potential: The dynamics of a cosmological model fueled by scalar field dark matter with
a cosh-like potential plus a cosmological constant is investigated in detail.
It is revealed that the late-time attractor is always the de Sitter solution,
and that, depending on... | Observational Evidence Against Long-Lived Spiral Arms in Galaxies: We test whether the spiral patterns apparent in many large disk galaxies
should be thought of as dynamical features that are stationary in a co-rotating
frame for > t_{dyn}, as implied by the density wave approach for explaining
spiral arms. If such spi... |
Capse.jl: efficient and auto-differentiable CMB power spectra emulation: We present Capse.jl, a novel neural network-based emulator designed for rapid
and accurate prediction of Cosmic Microwave Background (CMB) temperature,
polarization, and lensing angular power spectra. The emulator computes
predictions in just a fe... | An Atlas of Galaxy Spectral Energy Distributions from the Ultraviolet to
the Mid-Infrared: We present an atlas of 129 spectral energy distributions for nearby galaxies,
with wavelength coverage spanning from the UV to the mid-infrared. Our atlas
spans a broad range of galaxy types, including ellipticals, spirals, mer... |
Exploring the Galaxy Mass-Metallicity Relation at z~3-5: Long-duration gamma-ray bursts (GRBs) provide a premier tool for studying
high-redshift star-forming galaxies thanks to their extreme brightness and
association with massive stars. Here we use GRBs to study the galaxy stellar
mass-metallicity (M*-Z) relation at z... | Interplanetary Dust as a Foreground for the LiteBIRD CMB Satellite
Mission: As ever-more sensitive experiments are made in the quest for primordial CMB B
Modes, the number of potentially significant astrophysical contaminants becomes
larger as well. Thermal emission from interplanetary dust, for example, has
been det... |
Effects of thermal inflation on small scale density perturbations: In cosmological scenarios with thermal inflation, extra eras of moduli matter
domination, thermal inflation and flaton matter domination exist between
primordial inflation and the radiation domination of Big Bang nucleosynthesis.
During these eras, cosm... | Cosmic slowing down of acceleration for several dark energy
parametrizations: We further investigate slowing down of acceleration of the universe scenario
for five parametrizations of the equation of state of dark energy using four
sets of supernovae data. In a maximal probability analysis we also use the
baryon acou... |
Fast LiH destruction in reaction with H: quantum calculations and
astrophysical consequences: We present a quantum-mechanical study of the exothermic 7LiH reaction with H.
Accurate reactive probabilities and rate coefficients are obtained by solving
the Schrodinger equation for the motion of the three nuclei on a sin... | Comparative Analysis of TRGBs (CATs) from Unsupervised, Multi-Halo-Field
Measurements: Contrast is Key: The Tip of the Red Giant Branch (TRGB) is an apparent discontinuity in the
color-magnitude diagram (CMD) along the giant branch due to the end of the red
giant evolutionary phase and is used to measure distances in... |
Dark-ages Reionization and Galaxy Formation Simulation XX. The
Ly$α$ IGM transmission properties and environment of bright galaxies
during the Epoch of Reionization: The highly neutral inter-galactic medium (IGM) during the Epoch of
Reionization (EoR) is expected to suppress Ly$\alpha$ emission with
damping-wing ab... | Constraining the inflationary potential with spectral distortions: Measuring spectral distortions (SDs) of the cosmic microwave background (CMB)
will provide new constraints on previously unexplored scales of the primordial
power spectrum, allowing us to extend the probed parameter space by several
orders of magnitude ... |
Using galaxy pairs as cosmological tracers: The Alcock-Paczynski (AP) effect uses the fact that, when analyzed with the
correct geometry, we should observe structure that is statistically isotropic
in the Universe. For structure undergoing cosmological expansion with the
background, this constrains the product of the H... | Efficiency of pseudo-spectrum methods for estimation of Cosmic Microwave
Background B-mode power spectrum: Estimation of the B-mode angular power spectrum of polarized anisotropies of
the cosmic microwave background (CMB) is a key step towards a full exploitation
of the scientific potential of this probe. In the cont... |
Seeing in the dark -- II. Cosmic shear in the Sloan Digital Sky Survey: Statistical weak lensing by large-scale structure -- cosmic shear -- is a
promising cosmological tool, which has motivated the design of several large
upcoming surveys. Here, we present a measurement of cosmic shear using coadded
Sloan Digital Sky ... | Relativistic collapse and explosion of rotating supermassive stars with
thermonuclear effects: We present results of general relativistic simulations of collapsing
supermassive stars with and without rotation using the two-dimensional general
relativistic numerical code Nada, which solves the Einstein equations writt... |
Multi-Messenger Astrophysics with the Cosmic Neutrino Background: The massive neutrinos of the Cosmic Neutrino Background (C$\nu$B) are
fundamental ingredients of the radiation-dominated early universe and are
important non-relativistic probes of the large-scale structure formation in the
late universe. The dominant so... | Multi-Frequency Optical-Depth Maps and the Case for Free-Free Absorption
in Two Compact Symmetric Radio Sources: the CSO candidate J1324+4048 and the
CSO J0029+3457: We obtained dual-polarization VLBI observations at six frequencies of the
compact symmetric object J0029+3457 and the CSO candidate J1324+4048. By
com... |
Cosmological particle-in-cell simulations with ultralight axion dark
matter: We study cosmological structure formation with ultralight axion dark matter,
or "fuzzy dark matter (FDM), using a particle-mesh scheme to account for the
quantum pressure arising in the Madelung formulation of the
Schr\"odinger-Poisson equat... | Vibrationally excited HC3N in NGC 4418: We investigate the molecular gas properties of the deeply obscured luminous
infrared galaxy NGC 4418. We address the excitation of the complex molecule
HC3N to determine whether its unusually luminous emission is related to the
nature of the buried nuclear source. We use IRAM 30m... |
Primordial quantum nonequilibrium and large-scale cosmic anomalies: We study incomplete relaxation to quantum equilibrium at long wavelengths,
during a pre-inflationary phase, as a possible explanation for the reported
large-scale anomalies in the cosmic microwave background (CMB). Our scenario
makes use of the de Brog... | Emergence of the Temperature-Density Relation in the Low Density
Intergalactic Medium: We examine the evolution of the phase diagram of the low-density
intergalactic medium (IGM) during the Epoch of Reionization in simulation boxes
with varying reionization histories from the Cosmic Reionization on Computers
project.... |
Dynamical friction in cuspy galaxies: In this paper we treat the problem of the dynamical friction decay of a
massive object moving in an elliptical galaxy with a cuspidal inner
distribution of the mass density. We present results obtained by both
self-consistent, direct summation, N-body simulations, as well as by a n... | Test of the cosmic evolution using Gaussian processes: Much focus was on the possible slowing down of cosmic acceleration under the
dark energy parametrization. In the present paper, we investigate this subject
using the Gaussian processes (GP), without resorting to a particular template
of dark energy. The reconstruct... |
Constraints on Dark Matter-Photon Coupling in the Presence of
Time-Varying Dark Energy: In a recent work [Phys. Rev. D 98, 043521 (2018)], we have investigated a
dark matter (DM)-photon coupling model in which the DM decays into photons in
the presence of dark energy (DE) with the constant equation of state (EoS)
par... | On the Dynamics of Non-Relativistic Flavor-Mixed Particles: Evolution of a system of interacting non-relativistic quantum flavor-mixed
particles is considered both theoretically and numerically. It was shown that
collisions of mixed particles not only scatter them elastically, but can also
change their mass eigenstates... |
Time Variable Cosmological Constant from Renormalization Group Equations: In this paper, a time variable cosmological constant (CC) from
renormalization group equations (RGEs) is explored, where the renormalization
scale $\mu^2=R^{-2}_{CC}=Max(\dot{H}+2H^2,-\dot{H})$ is taken. The cosmological
parameters, such as dimen... | Image simulations for strong and weak gravitational lensing: Gravitational lensing has been identified as a powerful tool to address
fundamental problems in astrophysics at different scales, ranging from
exoplanet identification to dark energy and dark matter characterization in
cosmology. Image simulations have played... |
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