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Comparing the scalar-field dark energy models with recent observations: We investigate the general properties of a class of scalar-field dark energy
models (i.e., $\phi$CDM models) which behave like cosmological trackers at
early times. Particularly, we choose three $\phi$CDM models with typical
potentials, i.e., $V(\p... | Possible discrimination of black hole origins from the lensing rate of
DECIGO and B-DECIGO sources: In this paper, we forecast the expected detection rates and redshift
distributions of gravitationally lensed gravitational waves (GWs) from three
different mass distributions of primordial black holes (PBHs) and two st... |
Dark Matter as a Possible New Energy Source for Future Rocket Technology: Current rocket technology can not send the spaceship very far, because the
amount of the chemical fuel it can take is limited. We try to use dark matter
(DM) as fuel to solve this problem. In this work, we give an example of DM
engine using dark ... | SPHS: Smoothed Particle Hydrodynamics with a higher order dissipation
switch: We present a novel implementation of Smoothed Particle Hydrodynamics (SPHS)
that uses the spatial derivative of the velocity divergence as a higher order
dissipation switch. Our switch -- which is second order accurate -- detects
flow conve... |
A New Probe of Gaussianity and Isotropy applied to the CMB Maps: We introduce a new mathematical tool (a direction-dependent probe) to analyse
the randomness of purported isotropic Gaussian random fields on the sphere. We
apply the probe to assess the full-sky cosmic microwave background (CMB)
temperature maps produced... | Optimizing spectral stacking for 21-cm observations of galaxies:
accuracy assessment and symmetrized stacking: We present an assessment of the accuracy of common operations performed in
$21$-cm spectral line stacking experiments. To this end, we generate mock
interferometric data surveying the 21-cm emission at frequ... |
Do cosmological observations allow a negative $Λ$?: In view of the recent measurement of $H_{0}$ from HST and SH0ES team, we
explore the possibility of existence of a negative cosmological constant (AdS
vacua in the dark energy sector) in the Universe. In this regard, we consider
quintessence fields on top of a negativ... | Running Vacuum Cosmological Models: Linear Scalar Perturbations: In cosmology, phenomenologically motivated expressions for running vacuum are
commonly parametrized as linear functions $\Lambda(H^2)$ or $\Lambda(R)$. Such
kind of models assume an equation of state for vacuum given by $\,\overline
P_\Lambda=-\,\overline... |
Direct Dark Matter Search with the CRESST-II Experiment: The quest for the particle nature of dark matter is one of the big open
questions of modern physics. The CRESST-II experiment, located at the Gran
Sasso laboratory in Italy, is optimised for the detection of the elastic
scattering of dark matter particles with or... | Faraday scaling and the Bicep2 observations: As repeatedly speculated in the past, the linear polarization of the Cosmic
Microwave Background can be rotated via the Faraday effect. An economic
explanation of the recent Bicep2 observations, not relying on long-wavelength
tensor modes of the geometry, would stipulate tha... |
An analytic implementation of the IR-resummation for the BAO peak: We develop an analytic method for implementing the IR-resummation of
arXiv:1404.5954, which allows one to correctly and consistently describe the
imprint of baryon acoustic oscillations (BAO) on statistical observables in
large-scale structure. We show ... | Cosmological constraints from line intensity mapping with interlopers: Understanding the formation and evolution of the Universe is crucial for
cosmological studies, and the line intensity mapping provides a powerful tool
for this kind of study. We propose to make use of multipole moments of
redshift-space line intensi... |
Inner cusps of the first dark matter haloes: Formation and survival in a
cosmological context: We use very high resolution cosmological zoom simulations to follow the early
evolution of twelve first-generation haloes formed from gaussian initial
conditions with scale-free power spectra truncated on small scales by a
... | The Atacama Cosmology Telescope: Delensed Power Spectra and Parameters: We present LCDM cosmological parameter constraints obtained from delensed
microwave background power spectra. Lensing maps from a subset of DR4 data from
the Atacama Cosmology Telescope (ACT) are used to undo the lensing effect in
ACT spectra obser... |
Tachyonic fields in cosmology: The possibility of explanation of accelerated expansion of the Universe by
tachyonic scalar fields which homogeneously fill the world is discussed. The
dependences of potential and kinetic term on scale factor are deduced for the
case of quintessential and phantom dark energy with general... | Halo mass distribution reconstruction across the cosmic web: We study the relation between halo mass and its environment from a
probabilistic perspective. We find that halo mass depends not only on local
dark matter density, but also on non-local quantities such as the cosmic web
environment and the halo-exclusion effe... |
Resolving the timing problem of the globular clusters orbiting the
Fornax dwarf galaxy: We re-investigate the old problem of the survival of the five globular
clusters orbiting the Fornax dwarf galaxy in both standard and modified
Newtonian dynamics. For the first time in the history of the topic, we use
accurate mas... | X-ray and Sunyaev-Zeldovich properties of the WHIM: We use numerical simulations to predict the soft X-ray ([0.4-0.6] keV) and
Sunyaev-Zeldovich signal (at 150 GHz) from the large scale structure in the
Universe and then compute 2-point statistics to study the spatial distribution
and time evolution of the signals. The... |
Effects of superstructure environment on galaxy groups: We analyse properties of galaxy groups and their dependence on the large
scale environment as defined by superstructures. We find that group galaxy
cross correlations depend only on group properties regardless the groups reside
in superstructures. This indicates t... | Importance of high-frequency bands for thermal dust removal in ECHO: The Indian Consortium of Cosmologists has proposed a cosmic microwave
background (CMB) space mission, Exploring Cosmic History and Origin (ECHO). A
major scientific goal of the mission is to detect the primordial B-mode signal
of CMB polarization. The... |
The Linear Point: A cleaner cosmological standard ruler: We show how a characteristic length scale imprinted in the galaxy two-point
correlation function, dubbed the "linear point", can serve as a comoving
cosmological standard ruler. In contrast to the Baryon Acoustic Oscillation
peak location, this scale is constant ... | Dynamical cluster masses from photometric surveys: The masses of galaxy clusters can be measured using data obtained exclusively
from wide photometric surveys in one of two ways: directly from the amplitude
of the weak lensing signal or, indirectly, through the use of scaling relations
calibrated using binned lensing m... |
Dark Radiation in extended cosmological scenarios: Recent cosmological data have provided evidence for a "dark" relativistic
background at high statistical significance. Parameterized in terms of the
number of relativistic degrees of freedom Neff, however, the current data seems
to indicate a higher value than the one ... | Testing one-loop galaxy bias: Power spectrum: We test the regime of validity of one-loop galaxy bias for a wide variety of
biased tracers. Our most stringent test asks the bias model to simultaneously
match the galaxy-galaxy and galaxy-mass spectrum, using the measured nonlinear
matter spectrum from the simulations to ... |
Extremely rapid star cluster disruption in high-shear circumnuclear
starburst rings: the unusual case of NGC 7742: All known mass distributions of recently formed star cluster populations
resemble a "universal" power-law function. Here we assess the impact of the
extremely disruptive environment in NGC 7742's circumn... | X-ray Properties of SPT Selected Galaxy Clusters at 0.2<z<1.5 Observed
with XMM-Newton: We present measurements of the X-ray observables of the intra-cluster medium
(ICM), including luminosity $L_X$, ICM mass $M_{ICM}$, emission-weighted mean
temperature $T_X$, and integrated pressure $Y_X$, that are derived from
XMM... |
The nature of non-Gaussianity and statistical isotropy of the 408 MHz
Haslam synchrotron map: Accurate component separation of full-sky maps in the radio and microwave
frequencies, such as the cosmic microwave background (CMB), relies on a
thorough understanding of the statistical properties of the Galactic foregroun... | Escape from the swamp with spectator: In the context of string theory, several conjectural conditions have been
proposed for low energy effective field theories not to be in swampland, the
UV-incomplete class. The recent ones represented by the de Sitter and
trans-Planckian censorship conjectures in particular seem to ... |
The mass of first stars: We perform a three dimensional radiation hydrodynamics simulation to
investigate the formation of first stars from initial collapse of a primordial
gas cloud to formation and growth of protostars. The simulation is integrated
until 0.1 Myrs after the formation of the primary protostar by which ... | Faraday Rotation Measure due to the Intergalactic Magnetic Field: Studying the nature and origin of the intergalactic magnetic field (IGMF) is
an outstanding problem of cosmology. Measuring Faraday rotation would be a
promising method to explore the IGMF in the large-scale structure (LSS) of the
universe. We investigat... |
The Snapshot Hubble U-Band Cluster Survey (SHUCS). I. Survey Description
and First Application to the Mixed Star Cluster Population of NGC 4041: We present the Snapshot Hubble U-band Cluster Survey (SHUCS), a project aimed
at characterizing the star cluster populations of ten nearby galaxies (d<23
Mpc, half within 12... | Post-$Planck$ constraints on interacting vacuum energy: We present improved constraints on an interacting vacuum model using updated
astronomical observations including the first data release from Planck. We
consider a model with one dimensionless parameter, $\alpha$, describing the
interaction between dark matter and ... |
Resolving primordial physics through correlated signatures: We discuss correlations among spectral observables as a new tool for
differentiating between models for the primordial perturbation. We show that if
generated in the isocurvature sector, a running of the scalar spectral index is
correlated with the statistical... | Tomographic analyses of the CMB lensing and galaxy clustering to probe
the linear structure growth: In a tomographic approach, we measure the cross-correlation between the CMB
lensing reconstructed from the Planck satellite and the galaxies of the
photometric redshift catalogue based on the combination of the South G... |
On the absence of radio halos in clusters with double relics: Pairs of radio relics are believed to form during cluster mergers, and are
best observed when the merger occurs in the plane of the sky. Mergers can also
produce radio halos, through complex processes likely linked to turbulent
re-acceleration of cosmic-ray ... | Lenticular galaxy IC 719: current building of the counterrotating
large-scale stellar disk: We have obtained and analyzed long-slit spectral data for the lenticular
galaxy IC 719. In this gas-rich S0 galaxy, its large-scale gaseous disk
counterrotates the global stellar disk. Moreover in the IC 719 disk we have
detec... |
Linear cosmological constraints on 2-body decaying dark matter scenarios
and the $S_8$ tension: The '$S_8$ tension' is a longstanding discrepancy between the cosmic
microwave background (CMB) and weak gravitational lensing determination of the
amplitude of matter fluctuations, parametrized as
$S_8\equiv\sigma_8(\Omeg... | The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation
schemes: Boltzmann codes are used extensively by several groups for constraining
cosmological parameters with Cosmic Microwave Background and Large Scale
Structure data. This activity is computationally expensive, since a typical
project requires f... |
First direct metallicity measurement of a lensed star-forming galaxy at
z=1.7: We present the rest-frame optical spectrum of a strongly lensed galaxy at
redshift z =1.7 behind the cluster Abell 1689. We detect the temperature
sensitive auroral line [O III] 4363, which allows the first direct metallicity
measurement f... | KiDS-1000 Methodology: Modelling and inference for joint weak
gravitational lensing and spectroscopic galaxy clustering analysis: We present the methodology for a joint cosmological analysis of weak
gravitational lensing from the fourth data release of the ESO Kilo-Degree
Survey (KiDS-1000) and galaxy clustering from... |
Cosmic evolution of radio selected active galactic nuclei in the COSMOS
field: We explore the cosmic evolution of radio AGN with low radio powers (L_1.4GHz
< 5\times10^25 W/Hz) out to z=1.3 using to-date the largest sample of ~600 low
luminosity radio AGN at intermediate redshift drawn from the VLA-COSMOS survey.
We ... | The Araucaria Project. The Distance to the Small Magellanic Cloud from
Near-Infrared Photometry of RR Lyrae Variables: We have obtained deep infrared J and K band observations of nine 4.9x4.9
arcmin fields in the Small Magellanic Cloud (SMC) with the ESO New Technology
Telescope equipped with the SOFI infrared camera... |
Quasar Ionization Front Lyα Emission in an Inhomogeneous
Intergalactic Medium: The conditions within the ionization front of a quasar during reionization (T
~ 30,000 K, neutral hydrogen fraction ~ 0.5) are ideal for producing
Lyman-alpha emission via collisional excitation of hydrogen atoms. Observations
of this emis... | The Integrated Sachs-Wolfe Effect in Time Varying Vacuum Model: The integrated Sachs-Wolfe (ISW) effect is an important implication for dark
energy. In this paper, we have calculated the power spectrum of the ISW effect
in the time varying vacuum cosmological model, where the model parameter
$\beta=4.407$ is obtained b... |
Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN
J0948+0022: There is growing evidence of relativistic jets in radio-loud narrow-line
Seyfert 1 (RL-NLS1) galaxies. We constrain the observational properties of the
radio emission in the first RL-NLS1 galaxy ever detected in gamma-rays, PMN
J0948+00... | Observations of a nearby filament of galaxy clusters with the Sardinia
Radio Telescope: We report the detection of diffuse radio emission which might be connected to
a large-scale filament of the cosmic web covering a 8deg x 8deg area in the
sky, likely associated with a z~0.1 over-density traced by nine massive gala... |
Baryon number transfer could delay Quark-Hadron transition in cosmology: In the early Universe, strongly interacting matter was a quark-gluon plasma.
Both lattice computations and heavy ion collision experiments however tell us
that, in the absence of chemical potentials, no plasma survives at $T <\sim
150$ MeV. The co... | Inflation Wars: A New Hope: We explore a class of primordial power spectra that can fit the observed
anisotropies in the cosmic microwave background well and that predicts a value
for the Hubble parameter consistent with the local measurement of $H_0 = 74$
km/s/Mpc. This class of primordial power spectrum consists of a... |
Fine structure constant measurements in quasar absorption systems: Detecting any evolution of dimensionless in the ratios of physical
quantities, such as the fine structure constant, would prove that the Weak
Equivalence Principle is violated and lead to a paradigm shift in physics. High
resolution spectroscopy of quas... | A Strange Mènage Á Trois: The Magellanic Clouds may have joined our Milky Way system quite recently.
The Large Magellanic Cloud turns out to be a remarkably luminous object that is
close to the upper luminosity limit of the class of magellanic irregular
galaxies. |
Short Review of the main achievements of the Scalar Field, Fuzzy,
Ultralight, Wave, BEC Dark Matter model: The Scalar Field Dark Matter model has been known in various ways throughout
its history; Fuzzy, BEC, Wave, Ultralight, Axion-like Dark Matter, etc. All of
them consist in proposing that the dark matter of the u... | The impact of extragalactic foregrounds on internal delensing of CMB
B-mode polarization: The search for primordial $B$-mode polarization of the CMB is limited by the
sample variance of $B$-modes produced at later times by gravitational lensing.
Constraints can be improved by `delensing': using some proxy of the matt... |
Evolution of the Red Sequence Giant to Dwarf Ratio in Galaxy Clusters
out to z ~ 0.5: We analyze deep g' and r' band data of 97 galaxy clusters imaged with MegaCam
on the Canada-France-Hawaii telescope. We compute the number of luminous
(giant) and faint (dwarf) galaxies using criteria based on the definitions of
de ... | The R_h = ct Universe: The backbone of standard cosmology is the Friedmann-Robertson-Walker solution
to Einstein's equations of general relativity (GR). In recent years,
observations have largely confirmed many of the properties of this model, which
is based on a partitioning of the universe's energy density into three... |
Novel null tests for the spatial curvature and homogeneity of the
Universe and their machine learning reconstructions: A plethora of observational data obtained over the last couple of decades has
allowed cosmology to enter into a precision era and has led to the foundation
of the standard cosmological constant and c... | Efficiently evaluating loop integrals in the EFTofLSS using QFT
integrals with massive propagators: We develop a new way to analytically calculate loop integrals in the
Effective Field Theory of Large Scale-Structure. Previous available methods
show severe limitations beyond the one-loop power spectrum due to analyti... |
NH and Mg Index Trends in Elliptical Galaxies: We examine the spectrum in the vicinity of the NH3360 index of Davidge &
Clark (1994), which was defined to measure the NH absorption around 3360 \AA
and which shows almost no trend with velocity dispersion (Toloba et al. 2009),
unlike other N- sensitive indices, which sho... | Gravitational waves at interferometer scales and primordial black holes
in axion inflation: We study the prospects of detection at terrestrial and space interferometers,
as well as at pulsar timing array experiments, of a stochastic gravitational
wave background which can be produced in models of axion inflation. Thi... |
Halo abundances within the cosmic web: We investigate the dependence of the mass function of dark-matter haloes on
their environment within the cosmic web of large-scale structure. A dependence
of the halo mass function on large-scale mean density is a standard element of
cosmological theory, allowing mass-dependent bi... | The evolution of the star formation activity per halo mass up to
redshift ~ 1.6 as seen by Herschel: Star formation in massive galaxies is quenched at some point during
hierarchical mass assembly. To understand where and when the quenching
processes takes place, we study the evolution of the total star formation rate... |
Averaging the AGN X-ray spectra from deep Chandra fields: The X-ray spectra of Active Galactic Nuclei (AGN) carry the signatures of the
emission from the central region, close to the Super Massive Black Hole (SMBH).
For this reason, the study of deep X-ray spectra is a powerful instrument to
investigate the origin of t... | SPT 0538-50: Physical conditions in the ISM of a strongly lensed dusty
star-forming galaxy at z=2.8: We present observations of SPT-S J053816-5030.8, a gravitationally-lensed
dusty star forming galaxy (DSFG) at z = 2.7817, first discovered at millimeter
wavelengths by the South Pole Telescope. SPT 0538-50 is typical ... |
Growth rate of cosmological perturbations at z ~ 0.1 from a new
observational test: Spatial variations in the distribution of galaxy luminosities, estimated from
redshifts as distance proxies, are correlated with the peculiar velocity field.
Comparing these variations with the peculiar velocities inferred from galaxy... | Magnified or multiply imaged? - Search strategies for gravitationally
lensed supernovae in wide-field surveys: Strongly lensed supernovae can be detected as multiply imaged or highly
magnified transients. In order to compare the performances of these two
observational strategies, we calculate expected discovery rates... |
Extending and Calibrating the Velocity dependent One-Scale model for
Cosmic Strings with One Thousand Field Theory Simulations: Understanding the evolution and cosmological consequences of topological
defect networks requires a combination of analytic modeling and numerical
simulations. The canonical analytic model f... | Black Holes in our Galactic Halo: Compatibility with FGST and PAMELA
Data and Constraints on the First Stars: 10 to 10^5 solar mass black holes with dark matter spikes that formed in
early minihalos and still exist in our Milky Way Galaxy today are examined in
light of recent data from the Fermi Gamma-Ray Space Teles... |
A Revised Broad-Line Region Radius and Black Hole Mass for the
Narrow-Line Seyfert 1 NGC 4051: We present the first results from a high sampling rate, multi-month
reverberation mapping campaign undertaken primarily at MDM Observatory with
supporting observations from telescopes around the world. The primary goal of
t... | Pioneer Anomaly in Perturbed FRW Metric: In this manuscript, it is shown that the Pioneer anomaly is the local
evidence for an expanding universe. In other words, its value is a direct
measure of the Hubble constant while its sign shows the expanding behavior of
the dynamics of the universe. This analysis is obtained b... |
HI Lyman-alpha equivalent widths of stellar populations: We have compiled a library of stellar Lyman-alpha equivalent widths in O and
B stars using the model atmosphere codes CMFGEN and TLUSTY, respectively. The
equivalent widths range from about 0 to 30 \AA in absorption for early-O to
mid-B stars. The purpose of this... | Enhanced Nitrogen in Morphologically Disturbed Blue Compact Galaxies at
0.20 < z < 0.35: Probing Galaxy Merging Features: We present a study of correlations between the elemental abundances and
galaxy morphologies of 91 blue compact galaxies (BCGs) at z=0.20-0.35 with
Sloan Digital Sky Survey (SDSS) DR7 data. We clas... |
Two-Field quintessential Higgs Inflation: We study a two-field quintessential Higgs inflation model in which a
quintessence field with an exponential potential $e^{-\beta\phi/M_P}$ is
coupled to the Higgs field from the beginning of inflation. The Higgs field
itself is also non-minimally coupled to gravity. The inflati... | Flux and Photon Spectral Index Distributions of Fermi-LAT Blazars And
Contribution To The Extragalactic Gamma-ray Background: We present a determination of the distributions of photon spectral index and
gamma-ray flux - the so called LogN-LogS relation - for the 352 blazars
detected with a greater than approximately ... |
Multiwavelength investigations of co-evolution of bright custer galaxies: We report a systematic multi-wavelength investigation of environments of the
brightest cluster galaxies (BCGs), using the X-ray data from the Chandra
archive, and optical images taken with 34'x 27' field-of-view Subaru
Suprime-Cam. Our goal is to... | A mid-IR study of Hickson Compact Groups II. Multi-wavelength analysis
of the complete GALEX-Spitzer Sample: We present a comprehensive study on the impact of the environment of compact
galaxy groups on the evolution of their members using a multi-wavelength
analysis, from the UV to the infrared, for a sample of 32 H... |
Constraining the Variation of the Fine Structure Constant with
Observations of Narrow Quasar Absorption Lines: Attempts to measure the variability of the fine structure constant alpha over
cosmological time, using spectra of high redshift quasars have produced
conflicting results. We use the Many Multiplet (MM) metho... | Unknowns and unknown unknowns: from dark sky to dark matter and dark
energy: Answering well-known fundamental questions is usually regarded as the major
goal of science. Discovery of other unknown and fundamental questions is,
however, even more important. Recognition that "we didn't know anything" is the
basic scien... |
The core fundamental plane of B2 radio galaxies: The photometric, structural and kinematical properties of the centers of
elliptical galaxies, harbor important information of the formation history of
the galaxies. In the case of non active elliptical galaxies these properties
are linked in a way that surface brightness... | Nonlinear Structure Formation with the Environmentally Dependent Dilaton: We have studied the nonlinear structure formation of the environmentally
dependent dilaton model using $N$-body simulations. We find that the mechanism
of suppressing the scalar fifth force in high-density regions works very well.
Within the para... |
Infrared 3-4 Micron Spectroscopy of Nearby PG QSOs and AGN-Nuclear
Starburst Connections in High-luminosity AGN Populations: We present the results of infrared L-band (3-4 micron) slit spectroscopy of
30 PG QSOs at z < 0.17, the representative sample of local high-luminosity,
optically selected AGNs. The 3.3 micron p... | The influence of galaxy mergers on the mass dispersion of brightest
cluster galaxies: The absolute magnitude of the brightest galaxy of clusters varies remarkably
little and is nearly independent of all other physical properties of the
cluster as, e.g., its spatial extension or its richness. The question arises
wheth... |
Flows For The Masses: A multi-fluid non-linear perturbation theory for
massive neutrinos: Velocity dispersion of the massive neutrinos presents a daunting challenge
for non-linear cosmological perturbation theory. We consider the neutrino
population as a collection of non-linear fluids, each with uniform initial
mome... | Probing cosmic acceleration by strong gravitational lensing systems: Recently, some divergent conclusions about cosmic acceleration were obtained
using type Ia supernovae (SNe Ia), with opposite assumptions on the intrinsic
luminosity evolution. In this paper, we use strong gravitational lensing
systems to probe the co... |
Absolute calibration of the polarisation angle for future CMB B-mode
experiments from current and future measurements of the Crab nebula: A tremendous international effort is currently dedicated to observing the
so-called primordial B modes of the Cosmic Microwave Background (CMB)
polarisation. If measured, this fain... | Emulation of the Cosmic Dawn 21-cm Power Spectrum and Classification of
Excess Radio Models Using an Artificial Neural Network: The cosmic 21-cm line of hydrogen is expected to be measured in detail by the
next generation of radio telescopes. The enormous dataset from future 21-cm
surveys will revolutionize our under... |
Spectral distortions from the dissipation of tensor perturbations: Spectral distortions of the cosmic microwave background (CMB) may become a
powerful probe of primordial perturbations at small scales. Existing studies of
spectral distortions focus almost exclusively on primordial scalar metric
perturbations. Similarly... | Cosmic microwave background limits on accreting primordial black holes: Interest in the idea that primordial black holes (PBHs) might comprise some
or all of the dark matter has recently been rekindled following LIGO's first
direct detection of a binary-black-hole merger. Here we revisit the effect of
accreting PBHs on... |
Anisotropies in the stochastic gravitational-wave background: Formalism
and the cosmic string case: We develop a powerful analytical formalism for calculating the energy density
of the stochastic gravitational wave background, including a full description
of its anisotropies. This is completely general, and can be ap... | Quantifying cosmic variance: We determine an expression for the cosmic variance of any "normal" galaxy
survey based on examination of M* +/- 1 mag galaxies in the SDSS DR7 data cube.
We find that cosmic variance will depend on a number of factors principally:
total survey volume, survey aspect ratio, and whether the ar... |
Partially Cooled Shocks: Detectable Precursors in the Warm/Hot
Intergalactic Medium: I present computations of the integrated column densities produced in the
post-shock cooling layers and in the radiative precursors of partially-cooled
fast shocks as a function of the shock age. The results are applicable to the
sho... | Testing and selecting cosmological models with ultra-compact radio
quasars: In this paper, we place constraints on four alternative cosmological models
under the assumption of the spatial flatness of the Universe: CPL, EDE, GCG and
MPC. A new compilation of 120 compact radio quasars observed by
very-long-baseline int... |
IGM Constraints from the SDSS-III/BOSS DR9 Ly-alpha Forest Flux
Probability Distribution Function: The Ly$\alpha$ forest transmission probability distribution function (PDF) is
an established probe of the intergalactic medium (IGM) astrophysics, especially
the temperature-density relationship of the IGM. We measure t... | Shaken, Not Stirred: The Disrupted Disk of the Starburst Galaxy NGC 253: Near-infrared images obtained with the CFHT WIRCam are used to investigate
the recent history of the nearby Sculptor Group spiral NGC 253. The
distribution of stars in the disk is lop-sided, in the sense that the projected
density of AGB stars in ... |
Multiple Dark Matter as a self-regulating mechanism for dark sector
interactions: (Abridged) Present cosmological constraints and the absence of a direct
detection and identification of any dark matter particle candidate leave room
to the possibility that the dark sector of the Universe be actually more
complex than ... | The effect of pressure-anisotropy-driven kinetic instabilities on
magnetic field amplification in galaxy clusters: The intracluster medium (ICM) is the low-density diffuse magnetized plasma in
galaxy clusters, which reaches virial temperatures of up to 10^8 K. Under these
conditions, the plasma is weakly collisional ... |
The transition from population III to population II-I star formation: We present results from the first cosmological simulations which study the
onset of primordial, metal-free (population III), cosmic star formation and the
transition to the present-day, metal-rich star formation (population II-I),
including molecular... | Building models of the Universe with hydrodynamic simulations: Hydrodynamic simulations have become irreplaceable in modern cosmology for
exploring complex systems and making predictions to steer future observations.
In Chapter 1, we begin with a philosophical discussion on the role of
simulations in science. We argue ... |
Euclid preparation. TBD. The effect of linear redshift-space distortions
in photometric galaxy clustering and its cross-correlation with cosmic shear: Cosmological surveys planned for the current decade will provide us with
unparalleled observations of the distribution of galaxies on cosmic scales, by
means of which ... | Radio and Mid-Infrared Properties of Compact Starbursts: Distancing
Themselves from the Main Sequence: We investigate the relationship between 8.44\,GHz brightness temperatures and
1.4 to 8.44\,GHz radio spectral indices with 6.2\,$\mu$m polycyclic aromatic
hydrocarbon (PAH) emission and 9.7\,$\mu$m silicate absorpti... |
Evolution of the equation of state parameters of cosmological tachyonic
field components through mutual interaction: We study the perturbed equation of state (EOS) parameters of the cosmological
tachyonic scalar field components and their mutual time-dependent interaction.
It is shown that the discrete temperature-... | Constraining cosmic reionization with quasar, gamma ray burst, and Lya
emitter observations: We investigate the cosmic reionization history by comparing semi-analytical
models of the Lya forest with observations of high-z quasars and gamma ray
bursts absorption spectra. In order to constrain the reionization epoch z_... |
Early star-forming galaxies and the reionization of the Universe: Star forming galaxies represent a valuable tracer of cosmic history. Recent
observational progress with Hubble Space Telescope has led to the discovery and
study of the earliest-known galaxies corresponding to a period when the
Universe was only ~800 mil... | Reconstruction of inflationary scenarios in non-conservative unimodular
gravity: Unimodular gravity is an alternative theory of gravity to general relativity.
The gravitational field equations are given by the trace-free version of
Einstein's field equations. Due to the structure of the theory, unimodular
gravity adm... |
The KBC Void: Consistency with Supernovae Type Ia and the Kinematic SZ
Effect in a $Λ$LTB Model: There is substantial and growing observational evidence from the normalized
luminosity density in the near-infrared that the local universe is under-dense
on scales of several hundred Megaparsecs. We test whether our para... | Probing cosmic homogeneity in the Local Universe: We investigate the transition scale to homogeneity, $R_H$, using as cosmic
tracer the spectroscopic sample of blue galaxies from the Sloan Digital Sky
Survey (SDSS). Considering the spatial distribution of the galaxy sample we
compute the two point correlation function ... |
Precious Metals in SDSS Quasar Spectra II: Tracking the Evolution of
Strong, 0.4 < z < 2.3 MgII Absorbers with Thousands of Systems: We have performed an analysis of over 34,000 MgII doublets at 0.36 < z < 2.29
in Sloan Digital Sky Survey (SDSS) Data-Release 7 quasar spectra; the catalog,
advanced data products, and ... | Cosmology with Planck T-E correlation coefficient: Tensions in cosmological parameters measurement motivate a revisit of the
effects of instrumental systematics. In this article, we focus on the Pearson's
correlation coefficient of the cosmic microwave background temperature and
polarization E modes $\mathcal{R}_\ell^{... |
A novel approach to quantifying the sensitivity of current and future
cosmological datasets to the neutrino mass ordering through Bayesian
hierarchical modeling: We present a novel approach to derive constraints on neutrino masses from
cosmological data, while taking into account our ignorance of the neutrino mass
... | The SDSS Coadd: 275 deg^2 of Deep SDSS Imaging on Stripe 82: We present details of the construction and characterization of the coaddition
of the Sloan Digital Sky Survey Stripe 82 \ugriz\ imaging data. This survey
consists of 275 deg$^2$ of repeated scanning by the SDSS camera of $2.5\arcdeg$
of $\delta$ over $-50\arc... |
Towards Cosmography of the Local Universe: Anisotropies in the distance-redshift relation of cosmological sources are
expected due to large-scale inhomogeneities in the local Universe. When the
observed sources are tracing a large-scale matter flow in a general spacetime
geometry, the distance-redshift relation with it... | Probing Dark Matter Clumps, Strings and Domain Walls with Gravitational
Wave Detectors: Gravitational wave astronomy has recently emerged as a new way to study our
Universe. In this work, we survey the potential of gravitational wave
interferometers to detect macroscopic astrophysical objects comprising the dark
matt... |
Bayes-X: a Bayesian inference tool for the analysis of X-ray
observations of galaxy clusters: We present the first public release of our Bayesian inference tool, Bayes-X,
for the analysis of X-ray observations of galaxy clusters. We illustrate the
use of Bayes-X by analysing a set of four simulated clusters at z=0.2-... | On the filamentary environment of galaxies: The correlation between the large-scale distribution of galaxies and their
spectroscopic properties at z=1.5 is investigated using the Horizon MareNostrum
cosmological run.
We have extracted a large sample of 10^5 galaxies from this large
hydrodynamical simulation featuring... |
Revisiting progenitor-age dependence of type Ia supernova luminosity
standardization process: Much of the research in supernova cosmology is based on an assumption that
the peak luminosity of type Ia supernovae (SNe Ia), after a standardization
process, is independent of the galactic environment. A series of recent s... | Optimal Weighting in Galaxy Surveys: Application to Redshift-Space
Distortions: Using multiple tracers of large-scale structure allows to evade the
limitations imposed by sampling variance for some parameters of interest in
cosmology. We demonstrate the optimal way of carrying out a multitracer
analysis in a galaxy r... |
Cosmography of the Local Universe by Multipole Analysis of the Expansion
Rate Fluctuation Field: We explore the possibility of characterizing the expansion rate on local
cosmic scales $(z \lesssim 0.1)$, where the cosmological principle is violated,
in a model-independent manner, i.e. in a more meaningful and compreh... | Annihilation Signatures of Hidden Sector Dark Matter Within
Early-Forming Microhalos: If the dark matter is part of a hidden sector with only very feeble couplings
to the Standard Model, the lightest particle in the hidden sector will
generically be long-lived and could come to dominate the energy density of the
univ... |
A new probe of the small-scale primordial power spectrum: astrometric
microlensing by ultracompact minihalos: The dark matter enclosed in a density perturbation with a large initial
amplitude (delta-rho/rho > 1e-3) collapses shortly after recombination and
forms an ultracompact minihalo (UCMH). Their high central den... | From Hubble to Snap Parameters: A Gaussian Process Reconstruction: By using recent $H(z)$ and SNe Ia data, we reconstruct the evolution of
kinematic parameters $H(z)$, $q(z)$, jerk and snap, using a model-independent,
non-parametric method, namely, the Gaussian Processes. Throughout the present
analysis, we have allowe... |
Discovery of large-scale diffuse radio emission and of a new galaxy
cluster in the surroundings of MACSJ0520.7-1328: We report the discovery of large-scale diffuse radio emission South-East of
the galaxy cluster MACS J0520.7-1328, detected through high sensitivity Giant
Metrewave Radio Telescope 323 MHz observations.... | Samples and statistics of CSS and GPS sources: Several samples have been proposed in the last years in order to study the
properties of intrinsically small sources. In this paper, we review the
properties of the main samples that are currently available, both selected on
the basis of spectral index and of morphology. A... |
Fuzzy Dark Matter and the 21cm Power Spectrum: We model the 21cm power spectrum across the Cosmic Dawn and the Epoch of
Reionization (EoR) in fuzzy dark matter (FDM) cosmologies. The suppression of
small mass halos in FDM models leads to a delay in the onset redshift of these
epochs relative to cold dark matter (CDM) s... | The Effect of the Peculiar Motions of the Lens, Source and the Observer
on the Gravitational Lensing Time Delay: An intervening galaxy acts as a gravitational lens and produces multiple
images of a single source such as a remote galaxy. Galaxies have peculiar
speeds in addition to the bulk motion arising due to the e... |
Renormalization-Group Running Induced Cosmic Inflation: As a contribution to a viable candidate for a standard model of cosmology, we
here show that pre-inflationary quantum fluctuations can provide a scenario for
the long-sought initial conditions for the inflaton field. Our proposal is
based on the assumption that at... | Mergers, AGN, and 'Normal' Galaxies: Contributions to the Distribution
of Star Formation Rates and Infrared Luminosity Functions: We use a novel method to predict the contribution of normal star-forming
galaxies, merger-induced bursts, and obscured AGN, to IR luminosity functions
(LFs) and global SFR densities. We us... |
Dark energy and matter interacting scenario can relieve $H_0$ and $S_8$
tensions: We consider a new cosmological model (named $\tilde\Lambda$CDM) in which the
vacuum energy interacts with matter and radiation, and test this model using
the current cosmological observations. Using the CMB+BAO+SN (CBS) data set to
cons... | The virialization density of peaks with general density profiles under
spherical collapse: We calculate the non-linear virialization density, $\Delta_c$, of halos under
spherical collapse from peaks with an arbitrary initial and final density
profile. This is in contrast to the standard calculation of $\Delta_c$ whic... |
The H alpha Galaxy Survey. VIII. Close companions and interactions, and
the definition of starbursts: (Shortened) We consider the massive star formation properties, radial
profiles, and atomic gas masses of those galaxies in our H alpha Galaxy Survey,
a representative sample of the local Universe of 327 disk galaxies... | Three-dimensional Keplerian orbit-superposition models of the nucleus of
M31: We present three-dimensional eccentric disc models of the nucleus of M31,
modelling the disc as a linear combination of thick rings of massless stars
orbiting in the potential of a central black hole. Our models are nonparametric
generalisa... |
Polarimetric imaging with the GMRT: We present the first set of polarimetric images made with the GMRT. These
were obtained as part of the program to commission the polarization mode at the
telescope. We find that the instrumental polarization leakage at the GMRT
varies with frequency. It is hence necessary to solve fo... | The Gemini Cluster Astrophysics Spectroscopic Survey (GCLASS): The Role
of Environment and Self-Regulation in Galaxy Evolution at z ~ 1: We evaluate the effects of environment and stellar mass on galaxy properties
at 0.85 < z < 1.20 using a 3.6um-selected spectroscopic sample of 797 cluster
and field galaxies drawn f... |
Studying Inflation with Future Space-Based Gravitational Wave Detectors: Motivated by recent progress in our understanding of the $B$-mode
polarization of cosmic microwave background (CMB), which provides important
information about the inflationary gravitational waves (IGWs), we study the
possibility to acquire inform... | Radio Planetary Nebulae in the Magellanic Clouds: We report the extragalactic radio-continuum detection of 15 planetary nebulae
(PNe) in the Magellanic Clouds (MCs) from recent Australia Telescope Compact
Array+Parkes mosaic surveys. These detections were supplemented by new and high
resolution radio, optical and IR ob... |
Death and Serious Injury by Dark Matter: Macroscopic dark matter refers to a variety of dark matter candidates that
would be expected to (elastically) scatter off of ordinary matter with a large
geometric cross-section. A wide range of macro masses $M_X$ and cross-sections
$\sigma_X$ remain unprobed. We show that over ... | The Contribution from Scattered Light to Quasar Galaxy Hosts: We present models representing the scattering of quasar radiation off free
electrons and dust grains in geometries that approximate the structure of
quasar host galaxies. We show that, for reasonable assumptions, scattering
alone can easily produce ratios of... |
Extragalactic millimeter-wave sources in South Pole Telescope survey
data: source counts, catalog, and statistics for an 87 square-degree field: We report the results of an 87 square-degree point-source survey centered at
R.A. 5h30m, decl. -55 deg. taken with the South Pole Telescope (SPT) at 1.4 and
2.0 mm wavelengt... | Revealing the galaxy-halo connection in IllustrisTNG: We use the IllustrisTNG (TNG) simulations to explore the galaxy-halo
connection as inferred from state-of-the-art cosmological,
magnetohydrodynamical simulations. With the high mass resolution and large
volume achieved by combining the 100 Mpc (TNG100) and 300 Mpc (... |
Self-Similar Dynamical Relaxation of Dark Matter Halos in an Expanding
Universe: We investigate the structure of cold dark matter halos using advanced models
of spherical collapse and accretion in an expanding Universe. These base on
solving time-dependent equations for the moments of the phase-space
distribution fun... | KiDS-1000 catalogue: Weak gravitational lensing shear measurements: We present weak lensing shear catalogues from the fourth data release of the
Kilo-Degree Survey, KiDS-1000, spanning 1006 square degrees of deep and
high-resolution imaging. Our `gold-sample' of galaxies, with well-calibrated
photometric redshift distr... |
Consistent and simultaneous modelling of galaxy clustering and
galaxy-galaxy lensing with Subhalo Abundance Matching: The spatial distribution of galaxies and their gravitational lensing signal
offer complementary tests of galaxy formation physics and cosmology. However,
their synergy can only be fully exploited if b... | CosmicNet I: Physics-driven implementation of neural networks within
Boltzmann-Einstein solvers: Einstein-Boltzmann Solvers (EBSs) are run on a massive scale by the cosmology
community when fitting cosmological models to data. We present a new concept
for speeding up such codes with neural networks. The originality o... |
A tale of dark matter capture, sub-dominant WIMPs, and neutrino
observatories: Weakly Interacting Massive Particles (WIMPs), which are among the best
motivated dark matter (DM) candidates, could make up all or only a fraction of
the total DM budget. We consider a scenario in which WIMPs are a sub-dominant
DM componen... | Long-term variability of extragalactic radio sources in the Planck Early
Release Compact Source Catalogue: Combining measurements taken using the Wilkinson Microwave Anisotropy Probe
(WMAP) from 2001 to 2008 with measurements taken using Planck from 2009 to
2010, we investigate the long-term flux density variability ... |
Platonic topology and CMB fluctuations: Homotopy, anisotropy, and
multipole selection rules: The Cosmic Microwave Background CMB originates from an early stage in the
history of the universe. Observed low multipole contributions of CMB
fluctuations have motivated the search for selection rules from the underlying
top... | The stellar mass structure of massive galaxies from z=0 to z=2.5;
surface density profiles and half-mass radii: We present stellar mass surface density profiles of a mass-selected sample of
177 galaxies at 0.5 < z < 2.5, obtained using very deep HST optical and
near-infrared data over the GOODS-South field, including... |
ScamPy -- A sub-halo clustering & abundance matching based Python
interface for painting galaxies on the dark matter halo/sub-halo hierarchy: We present a computational framework for "painting" galaxies on top of the
Dark Matter Halo/Sub-Halo hierarchy obtained from N-body simulations. The
method we use is based on t... | Hyperluminous infrared galaxies from IIFSCz: We present a catalogue of 179 hyperluminous infrared galaxies (HLIRGs) from
the Imperial IRAS-FSS Redshift (IIFSCz) Catalogue. Of the 92 with detections in
at least two far infrared bands, 62 are dominated by an M82-like starburst, 22
by an Arp220-like starburst and 8 by an ... |
Gravitational redshift in the void-galaxy cross-correlation function in
redshift space: We construct an analytic model for the void-galaxy cross-correlation function
that enables theoretical predictions of the dipole signal produced dominantly
by the gravitational redshift within voids for the first time. By extendin... | Radiation and energy release in a background field of axion-like dark
matter: We find that a fuzzy dark matter background and the mG scale magnetic field
in the galactic center can give rise to a radiation with a very large energy
release. The frequency of the radiation field is the same as the frequency of
the oscil... |
Density profiles and voids in modified gravity models: We study the formation of voids in a modified gravity model in which gravity
is generically stronger or weaker on large scales. We show that void abundances
provide complementary information to halo abundances: if normalized to the CMB,
models with weaker large-sca... | A 22-year Southern Sky Survey for Transient and Variable Radio Sources
using the Molonglo Observatory Synthesis Telescope: We describe a 22-year survey for variable and transient radio sources,
performed with archival images taken with the Molonglo Observatory Synthesis
Telescope (MOST). This survey covers $2775 \uni... |
Secular evolution of galaxies and galaxy clusters in decaying dark
matter cosmology: If the dark matter sector in the universe is composed by metastable
particles, galaxies and galaxy clusters are expected to undergo significant
secular evolution from high to low redshift. We show that the decay of dark
matter, with ... | A simulation-based inference pipeline for cosmic shear with the
Kilo-Degree Survey: The standard approach to inference from cosmic large-scale structure data
employs summary statistics that are compared to analytic models in a Gaussian
likelihood with pre-computed covariance. To overcome the idealising assumptions
ab... |
Statistics of cosmic density profiles from perturbation theory: The joint probability distribution function (PDF) of the density within
multiple concentric spherical cells is considered. It is shown how its cumulant
generating function can be obtained at tree order in perturbation theory as the
Legendre transform of a ... | Correlation and time delays of the X-ray and optical emission of the
Seyfert Galaxy NGC3783: We present simultaneous X-ray and optical B and V band light curves of the
Seyfert Galaxy NGC3783 spanning 2 years. The flux in all bands is highly
variable and the fluctuations are significantly correlated. As shown before b... |
The Rethermalizing Bose-Einstein Condensate of Dark Matter Axions: The axions produced during the QCD phase transition by vacuum realignment,
string decay and domain wall decay thermalize as a result of their
gravitational self-interactions when the photon temperature is approximately
500 eV. They then form a Bose-Eins... | How much a galaxy knows about its large-scale environment?: An
information theoretic perspective: The small-scale environment characterized by the local density is known to
play a crucial role in deciding the galaxy properties but the role of
large-scale environment on galaxy formation and evolution still remain a le... |
Constraints on neutrino masses from Lyman-alpha forest power spectrum
with BOSS and XQ-100: We present constraints on masses of active and sterile neutrinos. We use the
one-dimensional Ly$\alpha$-forest power spectrum from the Baryon Oscillation
Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey (SDSS-III) a... | Searching for axion-like particles through CMB birefringence from
string-wall networks: Axion-like particles (ALPs) can form a network of cosmic strings and domain
walls that survives after recombination and leads to anisotropic birefringence
of the cosmic microwave background (CMB). In addition to studying cosmic
st... |
Towards distinguishing variants of non-minimal inflation: We study models of inflation where the scalar field $\phi$ that drives
inflation is coupled non-minimally to gravity via $\xi \phi^2 R$, or where the
gravity sector is enlarged by an $R^2$ term. We consider the original Higgs
inflation, Starobinsky inflation, an... | The Faint End of the Luminosity Function and Low Surface Brightness
Galaxies: SHELS (Smithsonian Hectospec Lensing Survey) is a dense redshift survey
covering a 4 square degree region to a limiting R = 20.6. In the construction
of the galaxy catalog and in the acquisition of spectroscopic targets, we paid
careful att... |
Testing the coincidence problem with strong gravitational lens, Type Ia
supernovae and Hubble parameter observational data: In this paper, we use three different kinds of observational data, including
130 strong gravitational lensing (SGL) systems, type Ia supernovae (SNeIa:
Pantheon and Union2.1) and 31 Hubble param... | Cosmological constraints from HSC survey first-year data using deep
learning: We present cosmological constraints from the Subaru Hyper Suprime-Cam (HSC)
first-year weak lensing shear catalogue using convolutional neural networks
(CNNs) and conventional summary statistics. We crop 19
$3\times3\,\mathrm{{deg}^2}$ sub-... |
Deep learning reconstruction of the large scale structure of the
Universe from luminosity distance observations: Supernovae Ia (SNe) can provide a unique window on the large scale structure
(LSS) of the Universe at redshifts where few other observations are available,
by solving the inversion problem (IP) consisting ... | Premature Black Hole Death of Population III Stars by Dark Matter: Population III stars were the first generation of stars, formed in minihalos
of roughly primordial element abundances, and therefore metal-free. They are
thought to have formed at the cores of dense dark matter clouds. Interactions
between baryons and d... |
Machine Learning Classification to Identify Catastrophic Outlier
Photometric Redshift Estimates: We present results of using a basic binary classification neural network
model to identify likely catastrophic outlier photometric redshift estimates of
individual galaxies, based only on the galaxies' measured photometri... | The 21-cm bispectrum from neutral hydrogen islands at z < 6: Spatial variations in the Lyman-$\alpha$ forest opacity at $z<6$ seem to
require a late end to cosmic reionization. In this picture, the universe
contains neutral hydrogen 'islands' of up to 100 cMpc$/h$ in extent down to
redshifts as low as $z\sim 5.3$. This... |
Structure formation simulations with momentum exchange: alleviating
tensions between high-redshift and low-redshift cosmological probes: Persisting tensions between the cosmological constraints derived from
low-redshift probes and the ones obtained from temperature and polarisation
anisotropies of the Cosmic Microwav... | Science with the space-based interferometer eLISA. III: Probing the
expansion of the Universe using gravitational wave standard sirens: We investigate the capability of various configurations of the space
interferometer eLISA to probe the late-time background expansion of the
universe using gravitational wave standar... |
Gravitational Wave signatures of inflationary models from Primordial
Black Hole Dark Matter: Primordial Black Holes (PBH) could be the cold dark matter of the universe.
They could have arisen from large (order one) curvature fluctuations produced
during inflation that reentered the horizon in the radiation era. At re... | Gravitational Lensing Signatures of Axion Dark Matter Minihalos in
Highly Magnified Stars: Axions are a viable candidate for Cold Dark Matter (CDM) which should
generically form minihalos of sub-planetary masses from white-noise
isocurvature density fluctuations if the Peccei-Quinn phase transition occurs
after infla... |
Constraints of the equation of state of dark energy from current and
future observational data by piecewise parametrizations: The model-independent piecewise parametrizations (0-spline, linear-spline and
cubic-spline) are used to estimate constraints of equation of state of dark
energy ($w_{de}$) from current observa... | A major galaxy cluster merger caught by eROSITA: weak lensing mass
distribution and kinematic description: We present the weak lensing mass distribution of a triple merging cluster
candidate at $z_{\rm photo}\sim 0.36$ belonging to a supercluster recently
discovered during the eROSITA Performance Verification phase. ... |
The Absolute Magnitudes of Type Ia Supernovae in the Ultraviolet: We examine the absolute magnitudes and light-curve shapes of 14
nearby(redshift z = 0.004--0.027) Type Ia supernovae (SNe~Ia) observed in the
ultraviolet (UV) with the Swift Ultraviolet/Optical Telescope. Colors and
absolute magnitudes are calculated usi... | Resolving the problem of galaxy clustering on small scales: any new
physics needed?: Galaxy clustering sets strong constraints on the physics governing galaxy
formation and evolution. However, most current models fail to reproduce the
clustering of low-mass galaxies on small scales ($r<1Mpc/h$). In this paper we
stud... |
Science with CMB spectral distortions: The measurements of COBE/FIRAS have shown that the CMB spectrum is extremely
close to a perfect blackbody. There are, however, a number of processes in the
early Universe that should create spectral distortions at a level which is
within reach of present day technology. In this ta... | Constraints on the Hubble constant from Supernova Refsdal's reappearance: The gravitationally lensed Supernova Refsdal appeared in multiple images,
produced through gravitational lensing by a massive foreground galaxy cluster.
After the supernova appeared in 2014, lens models of the galaxy cluster
predicted an addition... |
Spin Alignment in Analogues of The Local Sheet: Tidal torque theory and simulations of large scale structure predict spin
vectors of massive galaxies should be coplanar with sheets in the cosmic web.
Recently demonstrated, the giants (K$_{s}$ $\leq$ -22.5 mag) in the Local
Volume beyond the Local Sheet have spin vector... | Stellar sources of dust in the high redshift Universe: With the aim of investigating whether stellar sources can account for the
>10^8 Msun dust masses inferred from mm/sub-mm observations of samples of
5<z<6.4 quasars,we develop a chemical evolution model which follows the
evolution of metals and dust on the stellar c... |
Mass bound for primordial black hole from trans-Planckian censorship
conjecture: The recently proposed trans-Planckian censorship conjecture (TCC) imposes a
strong constraint on the inflationary Hubble scale, of which the upper bound
could be largely relaxed by considering a noninstantaneous reheating history.
In thi... | Correcting for peculiar velocities of Type Ia Supernovae in clusters of
galaxies: Type Ia Supernovae (SNe Ia) are widely used to measure the expansion of the
Universe. To perform such measurements the luminosity and cosmological redshift
($z$) of the SNe Ia have to be determined. The uncertainty on $z$ includes an
un... |
Primordial black holes from sound speed resonance in the
inflaton-curvaton mixed scenario: We study sound speed resonance (SSR) mechanism for primordial black hole
(PBH) formation in an early universe scenario with inflaton and curvaton being
mixed. In this scenario, the total primordial density perturbations can be
... | Investigating the large-scale environment of wide-angle tailed radio
galaxies in the local Universe: We present a statistical analysis of the large-scale (up to 2 Mpc)
environment of an homogeneous and complete sample, both in radio and optical
selection, of wide-angle tailed radio galaxies (WATs) in the local Univer... |
Forty Years of Research on Isolated Galaxies: Isolated galaxies have not been a hot topic over the past four decades. This
is partly due to uncertainties about their existence. Are there galaxies
isolated enough to be interesting? Do they exist in sufficient numbers to be
statistically useful? Most attempts to compile ... | Exploring the inner region of Type 1 AGNs with the Keck interferometer: The exploration of extragalactic objects with long-baseline interferometers
in the near-infrared has been very limited. Here we report successful
observations with the Keck interferometer at K-band (2.2 um) for four Type 1
AGNs, namely NGC4151, Mrk... |
Cosmological Simulations for Combined-Probe Analyses: Covariance and
Neighbour-Exclusion Bias: We present a public suite of weak lensing mock data, extending the Scinet
Light Cone Simulations (SLICS) to simulate cross-correlation analyses with
different cosmological probes. These mocks include KiDS-450- and LSST-like... | Arc Statistics: The existence of an arc statistics problem was at the center of a strong
debate in the last fifteen years. With the aim to clarify if the optical depth
for giant gravitational arcs by galaxy clusters in the so called concordance
model is compatible with observations, several studies were carried out whi... |
BAO scale inference from biased tracers using the EFT likelihood: The physical scale corresponding to baryon acoustic oscillations (BAO), the
size of the sound horizon at recombination, is precisely determined by CMB
experiments. Measuring the apparent size of the BAO scale imprinted in the
clustering of galaxies gives... | The GALEX Arecibo SDSS Survey V: The Relation between the HI Content of
Galaxies and Metal Enrichment at their Outskirts: We have obtained long-slit spectra of 174 star-forming galaxies with stellar
masses greater than 10^10 M_\odot from the GALEX Arecibo SDSS (GASS) survey.
These galaxies have both HI and H_2 mass m... |
Exploring interacting holographic dark energy in a perturbed universe
with parameterized post-Friedmann approach: The model of holographic dark energy in which dark energy interacts with dark
matter is investigated in this paper. In particular, we consider the
interacting holographic dark energy model in the context ... | On primordial black holes from an inflection point: Recently, it has been claimed that inflationary models with an inflection
point in the scalar potential can produce a large resonance in the power
spectrum of curvature perturbation. In this paper however we show that the
previous analyses are incorrect. The reason is... |
Illuminating the Darkest Galaxies: Low luminosity dwarf galaxies provide stringent constraints on the nature of
dark matter. Establishing these constraints depends on precise kinematic
measurements of individual stars. In this overview for non-specialists, we
describe current and future prospects for three unique tests... | The Impact of Assuming Flatness in the Determination of Neutrino
Properties from Cosmological Data: Cosmological data have provided new constraints on the number of neutrino
species and the neutrino mass. However these constraints depend on assumptions
related to the underlying cosmology. Since a correlation is expec... |
Inflation with shallow dip and primordial black holes: Primordial black holes may arise through ultra slow-roll inflation. In this
work we study a toy model of ultra slow-roll inflation with a shallow dip. The
ultra slow-roll stage enhances the curvature perturbations and thus the
primordial scalar power spectrum. We a... | Dark Matter with N-Body Numerical Simulations: The development of numerical N -body simulations have allowed to study
formation process and evolution of galaxies at different scales. This paper
presents the fundamental concepts of N-body systems applied to the cosmological
evolution of the $\Lambda$-Cold Dark Matter ($... |
Could fresh lava be (warm) dark matter?: Dark matter models can be classified according to their impact on the
properties of galaxies, including cold dark matter (CDM), warm dark matter
(WDM), self-interacting dark matter (SIDM) and fuzzy dark matter (FDM). In
celebration of April Fool's Day, and also of the 1-year ann... | Separate Universe Simulations: The large-scale statistics of observables such as the galaxy density are
chiefly determined by their dependence on the local coarse-grained matter
density. This dependence can be measured directly and efficiently in N-body
simulations by using the fact that a uniform density perturbation ... |
Thermal abundance of non-relativistic relics with Sommerfeld enhancement: We propose an analytic treatment for computing the relic abundances of
non-relativistic particles whose annihilation rate at chemical decoupling is
increased by Sommerfeld enhancement. We find approximate rational functions
that closely fit the t... | The Zurich Environmental Study of Galaxies in Groups along the Cosmic
Web. III. Galaxy Photometric Measurements and the Spatially-Resolved Color
Properties of Early- and Late-Type Satellites in Diverse Environments: We present photometric measurements for the galaxies - and when possible
their bulges and disks - in... |
Inferring the redshift of more than 150 GRBs with a Machine Learning
Ensemble model: Gamma-Ray Bursts (GRBs), due to their high luminosities are detected up to
redshift 10, and thus have the potential to be vital cosmological probes of
early processes in the universe. Fulfilling this potential requires a large
sample... | Unbiased clustering estimates with the DESI fibre assignment: The Emission Line Galaxy survey made by the Dark Energy Spectroscopic
Instrument (DESI) survey will be created from five passes of the instrument on
the sky. On each pass, the constrained mobility of the ends of the fibres in
the DESI focal plane means that ... |
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