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Canonical transformations and squeezing formalism in cosmology: Canonical transformations are ubiquitous in Hamiltonian mechanics, since they
not only describe the fundamental invariance of the theory under phase-space
reparameterisations, but also generate the dynamics of the system. In the first
part of this work we ... | astro-ph_CO |
Active Galactic Nuclei Selected from GALEX Spectroscopy: The Ionizing
Source Spectrum at z~1: We use a complete sample of Lya emission-line selected AGNs obtained from
nine deep blank fields observed with the grism spectrographs on the Galaxy
Evolution Explorer (GALEX) satellite to measure the normalization and spect... | astro-ph_CO |
Re-examining the case for neutral gas near the redshift 7 quasar ULAS
J1120+0641: Signs of damping wing absorption attenuating the Lyman-$\alpha$ emission line
of the first known $z \sim 7$ quasar, ULAS J1120+0641, recently provided
exciting evidence of a significantly neutral IGM. This long-awaited signature
of reio... | astro-ph_CO |
The Effect of Modified Gravity on the Odds of the Bound Violations of
the Turn-Around Radii: The turn-around radii of the galaxy groups show the imprint of a long battle
between their self-gravitational forces and the accelerating space. The
standard $\Lambda$CDM cosmology based on the general relativity (GR) predict... | astro-ph_CO |
Constraining the mass of light bosonic dark matter using SDSS
Lyman-$α$ forest: If a significant fraction of the dark matter in the Universe is made of an
ultra-light scalar field, named fuzzy dark matter (FDM) with a mass $m_a$ of
the order of $10^{-22}-10^{-21}$ eV, then its de Broglie wavelength is large
enough to... | astro-ph_CO |
Redshift-weighted constraints on primordial non-Gaussianity from the
clustering of the eBOSS DR14 quasars in Fourier space: We present constraints on local primordial non-Gaussianity (PNG),
parametrized through $f^{\rm loc}_{\rm NL}$, using the Sloan Digital Sky Survey
IV extended Baryon Oscillation Spectroscopic Sur... | astro-ph_CO |
Ultra-steep spectrum emission in the merging galaxy cluster Abell 1914: A number of radio observations have revealed the presence of large
synchrotron-emitting sources associated with the intra-cluster medium. There is
strong observational evidence that the emitting particles have been
(re-)accelerated by shocks and tu... | astro-ph_CO |
[CII] and 12CO(1-0) Emission Maps in HLSJ091828.6+514223: A Strongly
Lensed Interacting System at z=5.24: We present Submillimeter Array (SMA) [CII] 158um and Jansky Very Large Array
(JVLA) $^{12}$CO(1-0) line emission maps for the bright, lensed, submillimeter
source at $z=5.2430$ behind Abell 773: HLSJ091828.6+5142... | astro-ph_CO |
Analyzing the 21-cm signal brightness temperature in the Universe with
inhomogeneities: We explore the 21-cm signal in our Universe containing inhomogeneous matter
distribution at considerably large scales. Employing Buchert's averaging
procedure in the context of a model of spacetime with multiple inhomogeneous
doma... | astro-ph_CO |
Radio Band Observations of Blazar Variability: The properties of blazar variability in the radio band are studied using the
unique combination of temporal resolution from single dish monitoring and
spatial resolution from VLBA imaging; such measurements, now available in all
four Stokes parameters, together with theore... | astro-ph_CO |
The incidence of cool gas in ~ 1e13 Msun halos: We present the first results of an ongoing spectroscopic follow-up of close
luminous red galaxy (LRGs) and MgII {\lambda}{\lambda} 2796,2803 absorber pairs
for an initial sample of 15 photometrically selected LRGs at physical projected
separations {\rho} \le 350 kpc/h fro... | astro-ph_CO |
Dynamical processes in galaxy centers: How does the gas get in nuclear regions to fuel black holes? How efficient is
the feedback? The different processes to cause rapid gas inflow (or outflow) in
galaxy centers are reviewed. Non axisymmetries can be created or maintained by
internal disk instabilities, or galaxy inter... | astro-ph_CO |
Inflation with an extra light scalar field after Planck: Bayesian inference techniques are used to investigate situations where an
additional light scalar field is present during inflation and reheating. This
includes (but is not limited to) curvaton-type models. We design a numerical
pipeline where $\simeq 200$ inflat... | astro-ph_CO |
Semi-blind Bayesian inference of CMB map and power spectrum: We present a new blind formulation of the Cosmic Microwave Background (CMB)
inference problem. The approach relies on a phenomenological model of the
multi-frequency microwave sky without the need for physical models of the
individual components. For all-sky ... | astro-ph_CO |
The Entrainment-Limited Evolution of FR II Sources: Maximum Sizes and A
Possible Connection to FR Is: We construct a simple theoretical model to investigate how entrainment
gradually erodes high-speed FR II jets. This process is described by embedding
a mixing-layer model developed originally to describe FR I objects... | astro-ph_CO |
The spectral index of polarized diffuse Galactic emission between 30 and
44 GHz: We present an estimate of the polarized spectral index between the Planck 30
and 44 GHz surveys in $3.7^\circ$ pixels across the entire sky. We use an
objective reference prior that maximises the impact of the data on the
posterior and m... | astro-ph_CO |
Microwave Spectro-Polarimetry of Matter and Radiation across Space and
Time: This paper discusses the science case for a sensitive spectro-polarimetric
survey of the microwave sky. Such a survey would provide a tomographic and
dynamic census of the three-dimensional distribution of hot gas, velocity
flows, early meta... | astro-ph_CO |
Prospects for Detecting Dark Matter Halo Substructure with Pulsar Timing: One of the open questions of modern cosmology is the nature and properties of
the Dark Matter halo and its substructures. In this work we study the
gravitational effect of dark matter substructures on pulsar timing
observations. Since millisecond... | astro-ph_CO |
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... | astro-ph_CO |
VIPERS: An Unprecedented View of Galaxies and Large-Scale Structure
Halfway Back in the Life of the Universe: The VIMOS Public Extragalactic Redshift Survey (VIPERS) is an ongoing ESO
Large Programme to map in detail the large-scale distribution of galaxies at
0.5 < z <1.2. With a combination of volume and sampling d... | astro-ph_CO |
Dust-to-metal ratios in damped Lyman-alpha absorbers: Fresh clues to the
origins of dust and optical extinction towards gamma-ray bursts: Motivated by the anomalous dust-to-metal ratios derived in the literature for
gamma-ray burst (GRB) damped Lyman-alpha absorbers (DLAs), we measure these
ratios using the dust-depl... | astro-ph_CO |
Clusters, Groups, and Filaments in the Chandra Deep Field-South up to
Redshift 1: We present a comprehensive structure detection analysis of the 0.3 square
degree area of the MUSYC-ACES field which covers the Chandra Deep Field-South
(CDFS). Using a density-based clustering algorithm on the MUSYC and ACES
photometric... | astro-ph_CO |
Symbolic Implementation of Extensions of the $\texttt{PyCosmo}$
Boltzmann Solver: $\texttt{PyCosmo}$ is a Python-based framework for the fast computation of
cosmological model predictions. One of its core features is the symbolic
representation of the Einstein-Boltzmann system of equations. Efficient
$\texttt{C/C++}$... | astro-ph_CO |
Reconstructing Redshift Distributions with Cross-Correlations: Tests and
an Optimized Recipe: Many of the cosmological tests to be performed by planned dark energy
experiments will require extremely well-characterized photometric redshift
measurements. Current estimates are that the true mean redshift of the objects
... | astro-ph_CO |
On approximations of the redshift-space bispectrum and power spectrum
multipoles covariance matrix: We investigate, in dark matter and galaxy mocks, the effects of approximating
the galaxy power spectrum-bispectrum estimated covariance as a diagonal matrix,
for an analysis that aligns with the specifications of recen... | astro-ph_CO |
The Efficacy of Galaxy Shape Parameters in Photometric Redshift
Estimation: A Neural Network Approach: We present a determination of the effects of including galaxy morphological
parameters in photometric redshift estimation with an artificial neural network
method. Neural networks, which recognize patterns in the in... | astro-ph_CO |
Effect of low mass dark matter particles on the Sun: We study the effect of dark matter (DM) particles in the Sun, focusing in
particular on the possible reduction of the solar neutrinos flux due to the
energy carried away by DM particles from the innermost regions of the Sun, and
to the consequent reduction of the tem... | astro-ph_CO |
Forecasting Constraints on the Evolution of the Hubble Parameter and the
Growth Function by Future Weak Lensing Surveys: The cosmological information encapsulated within a weak lensing signal can be
accessed via the power spectrum of the so called convergence. We use the Fisher
information matrix formalism with the c... | astro-ph_CO |
Relativistic Electron Scattering and Big Bang Nucleosynthesis: This paper is superseded by Arxiv:1911.07334. Big-bang nucleosynthesis (BBN)
is a valuable tool to constrain the physics of the early universe and is the
only probe of the radiation-dominated epoch. A fundamental assumption in BBN is
that the nuclear veloci... | astro-ph_CO |
Recovery of 21 cm intensity maps with sparse component separation: 21 cm intensity mapping has emerged as a promising technique to map the
large-scale structure of the Universe. However, the presence of foregrounds
with amplitudes orders of magnitude larger than the cosmological signal
constitutes a critical challenge.... | astro-ph_CO |
Orthogonal BipoSH measures : Scrutinizing sources of isotropy violation: The two point correlation function of the CMB temperature anisotropies is
generally assumed to be statistically isotropic (SI). Deviations from this
assumption could be traced to physical or observational artefacts and
systematic effects. Measurem... | astro-ph_CO |
Dark energy and dark matter perturbations in singular universes: We discuss the evolution of density perturbations of dark matter and dark
energy in cosmological models which admit future singularities in a finite
time. Up to now geometrical tests of the evolution of the universe do not
differentiate between singular u... | astro-ph_CO |
Turbulent formation of protogalaxies at the plasma to gas transition: The standard model of gravitational structure formation is based on the Jeans
1902 acoustic theory, neglecting crucial effects of viscosity, turbulence and
diffusion. A Jeans length scale L_J emerges that exceeds the scale of causal
connection ct dur... | astro-ph_CO |
Redshifted 21-cm bispectrum II: Impact of the spin temperature
fluctuations and redshift space distortions on the signal from the Cosmic
Dawn: We present a study of the 21-cm signal bispectrum (which quantifies the
non-Gaussianity in the signal) from the Cosmic Dawn (CD). For our analysis, we
have simulated the 21-... | astro-ph_CO |
Magnetic fields from cosmological bulk flows: We explore the possibility that matter bulk flows could generate the required
vorticity in the electron-proton-photon plasma to source cosmic magnetic fields
through the Harrison mechanism. We analyze the coupled set of perturbed Maxwell
and Boltzmann equations for a plasma... | astro-ph_CO |
Signatures of Modified Gravity on the 21-cm Power Spectrum at
Reionisation: Scalar modifications of gravity have an impact on the growth of structure.
Baryon and Cold Dark Matter (CDM) perturbations grow anomalously for scales
within the Compton wavelength of the scalar field. In the late time Universe
when reionisat... | astro-ph_CO |
$γ$ gravity: Steepness control: We investigate a simple generalization of the metric exponential $f(R)$
gravity theory that is cosmologically viable and compatible with solar system
tests of gravity. We show that, as compared to other viable $f(R)$ theories,
its steep dependence on the Ricci scalar $R$ facilitates agre... | astro-ph_CO |
Turnaround radius in $Λ$CDM, and dark matter cosmologies II: the
role of dynamical friction: This paper is an extension of the paper by Del Popolo, Chan, and Mota (2020)
to take account the effect of dynamical friction. We show how dynamical
friction changes the threshold of collapse, $\delta_c$, and the turn-around
... | astro-ph_CO |
Filament Hunting: Integrated HI 21cm Emission From Filaments Inferred by
Galaxy Surveys: Large scale filaments, with lengths that can reach tens of Mpc, are the most
prominent features in the cosmic web. These filaments have only been observed
indirectly through the positions of galaxies in large galaxy surveys or th... | astro-ph_CO |
RXJ 0921+4529: a binary quasar or gravitational lens?: We report the new spectroscopic observations of the gravitational lens RXJ
021+4529 with the multi-mode focal reducer SCORPIO of the SAO RAS 6-m
telescope. The new spectral observations were compared with the previously
observed spectra of components A and B of RXJ... | astro-ph_CO |
The contribution of star-forming galaxies to the cosmic radio background: Recent measurements of the temperature of the sky in the radio band, combined
with literature data, have convincingly shown the existence of a cosmic radio
background with an amplitude of $\sim 1$ K at 1 GHz and a spectral energy
distribution tha... | astro-ph_CO |
Millennium Simulation Dark Matter Haloes: Multi-fractal and Lacunarity
Analysis with Homogeneity Transition: We investigate from the fractal viewpoint the way in which the dark matter is
grouped at z = 0 in the Millennium dark matter cosmological simulation. The
determination of the cross to homogeneity in the Millen... | astro-ph_CO |
The effects of peculiar velocities on the morphological properties of
large-scale structure: It is known that the large-scale structure (LSS) mapped by a galaxy redshift
survey is subject to distortions by galaxies' peculiar velocities. Besides the
signatures generated in common N-point statistics, such as the anisot... | astro-ph_CO |
MC^2: A deeper look at ZwCl 2341.1+0000 with Bayesian galaxy clustering
and weak lensing analyses: ZwCl 2341.1+0000, a merging galaxy cluster with disturbed X-ray morphology
and widely separated ($\sim$3 Mpc) double radio relics, was thought to be an
extremely massive ($10-30 \times 10^{14} M_\odot$) and complex syst... | astro-ph_CO |
Extrasolar planets as a probe of modified gravity: We propose a new method to test modified gravity theories, taking advantage
of the available data on extrasolar planets. We computed the deviations from
the Kepler third law and use that to constrain gravity theories beyond General
Relativity. We investigate gravity mo... | astro-ph_CO |
Bayesian angular power spectrum analysis of interferometric data: We present a Bayesian angular power spectrum and signal map inference engine
which can be adapted to interferometric observations of anisotropies inthe
cosmic microwave background, 21 cm emission line mapping of galactic brightness
fluctuations, or 21 cm... | astro-ph_CO |
Features in single field slow-roll inflation: We compare the effects of local features (LF) and branch features (BF) of the
inflaton potential on the spectrum of primordial perturbations. We show that LF
affect the spectrum in a narrow range of scales while BF produce a step between
large and small scales with respect ... | astro-ph_CO |
Primordial feature constraints from BOSS+eBOSS: Understanding the universe in its pristine epoch is crucial in order to
obtain a concise comprehension of the late-time universe. Although current data
in cosmology are compatible with Gaussian primordial perturbations whose power
spectrum follows a nearly scale-invariant... | astro-ph_CO |
Morphological quenching of star formation: making early-type galaxies
red: We point out a natural mechanism for quenching of star formation in
early-type galaxies. It automatically links the color of a galaxy with its
morphology and does not require gas consumption, removal or termination of gas
supply. Given that st... | astro-ph_CO |
Probing high-redshift galaxies with Ly$α$ intensity mapping: We present a study of the cosmological Ly$\alpha$ emission signal at $z > 4$.
Our goal is to predict the power spectrum of the spatial fluctuations that
could be observed by an intensity mapping survey. The model uses the latest
data from the HST legacy field... | astro-ph_CO |
The connection between gamma-ray emission and millimeter flares in
Fermi/LAT blazars: We compare the gamma-ray photon flux variability of northern blazars in the
Fermi/LAT First Source Catalog with 37 GHz radio flux density curves from the
Metsahovi quasar monitoring program. We find that the relationship between
sim... | astro-ph_CO |
On the Primordial Black Hole Mass Function for Broad Spectra: We elaborate on the mass function of primordial black holes in the case in
which the power spectrum of the curvature perturbation is broad. For the case
of a broad and flat spectrum, we argue that such a mass function is peaked at
the smallest primordial bla... | astro-ph_CO |
Nonsingular bouncing cosmologies in light of BICEP2: We confront various nonsingular bouncing cosmologies with the recently
released BICEP2 data and investigate the observational constraints on their
parameter space. In particular, within the context of the effective field
approach, we analyze the constraints on the ma... | astro-ph_CO |
The radial and azimuthal profiles of Mg II absorption around 0.5 < z <
0.9 zCOSMOS galaxies of different colors, masses and environments: We map the radial and azimuthal distribution of Mg II gas within 200 kpc
(physical) of 4000 galaxies at redshifts 0.5 < z < 0.9 using co-added spectra
of more than 5000 background ... | astro-ph_CO |
Optical and HI properties of isolated galaxies in the 2MIG catalog. I.
General relationships: We analyze empirical relationships between the optical, near infrared, and HI
characteristics of isolated galaxies from the 2MIG Catalog covering the entire
sky. Data on morphological types, K_S-, and B-magnitudes, linear di... | astro-ph_CO |
Relativistic effects in the power spectrum of the large scale structure: The forthcoming Stage-IV experiments aim to map the large scale structure of
the Universe at high precision. The scales explored require a relativistic
description, in addition to statistical tools for their analysis. In this
thesis, we study the ... | astro-ph_CO |
Deep Chandra observation of the galaxy cluster WARPJ1415.1+3612 at z=1:
an evolved cool-core cluster at high-redshift: Using the deepest (370 ksec) Chandra observation of a high-redshift galaxy
cluster, we perform a detailed characterization of the intra-cluster medium
(ICM) of WARPJ1415.1+3612 at z=1.03. We also exp... | astro-ph_CO |
HerMES: dust attenuation and star formation activity in UV-selected
samples from z~4 to z~1.5: We study the link between observed ultraviolet luminosity, stellar mass, and
dust attenuation within rest-frame UV-selected samples at z~ 4, 3, and 1.5. We
measure by stacking at 250, 350, and 500 um in the Herschel/SPIRE i... | astro-ph_CO |
A nearby GRB host prototype for z~7 Lyman-break galaxies: Spitzer-IRS
and X-shooter spectroscopy of the host galaxy of GRB031203: Gamma-ray burst (GRB) host galaxies have been studied extensively in optical
photometry and spectroscopy. Here we present the first mid-infrared spectrum of
a GRB host, HG031203. It is one... | astro-ph_CO |
CNN photometric redshifts in the SDSS at $r\leq 20$: We release photometric redshifts, reaching $\sim$0.7, for $\sim$14M galaxies
at $r\leq 20$ in the 11,500 deg$^2$ of the SDSS north and south galactic caps.
These estimates were inferred from a convolution neural network (CNN) trained
on $ugriz$ stamp images of galaxi... | astro-ph_CO |
Time variation of the Equation of State for Dark Energy: The time variation of the equation of state ($w_Q$) for the dark energy is
analyzed by the current values of parameters $\Omega_Q $, $w_Q $ and their time
derivatives. In the future, detailed feature of the dark energy could be
observed, so we have considered the... | astro-ph_CO |
Studying the Dynamical Properties of 20 Nearby Galaxy Clusters: Using SDSS-DR7, we construct a sample of 42382 galaxies with redshifts in the
region of 20 galaxy clusters. Using two successive iterative methods, the
adaptive kernel method and the spherical infall model, we obtained 3396
galaxies as members belonging to... | astro-ph_CO |
Precision cosmology from large-scale structure of the Universe: Large scale structure of the Universe becomes a leading source of precision
cosmological information. We present two particular tools that can be used in
cosmological analyses of the redshift space galaxy clustering data: a new
open-source code CLASS-PT an... | astro-ph_CO |
Observational constraints on K-inflation models: We extend the ModeCode software of Mortonson, Peiris and Easther to enable
numerical computation of perturbations in K-inflation models, where the scalar
field no longer has a canonical kinetic term. Focussing on models where the
kinetic and potential terms can be separa... | astro-ph_CO |
Large Scale Anomalies in the Microwave Background: Causation and
Correlation: Most treatments of large scale anomalies in the microwave sky are a
posteriori, with unquantified look-elsewhere effects. We contrast these with
physical models of specific inhomogeneities in the early universe which then
generate apparent ... | astro-ph_CO |
Sample variance, source clustering and their influence on the counts of
faint radio sources: The shape of the curves defined by the counts of radio sources per unit area
as a function of their flux density was one of the earliest cosmological
probes. Radio source counts continue to be an area of interest, used to stu... | astro-ph_CO |
There was movement that was stationary, for the four-velocity had passed
around: Is the Doppler interpretation of galaxy redshifts in a
Friedmann-Lemaitre-Robertson-Walker (FLRW) model valid in the context of the
approach to comoving spatial sections pioneered by de Sitter, Friedmann,
Lemaitre and Robertson, i.e. acc... | astro-ph_CO |
The lack of star formation gradients in galaxy groups up to z~1.6: In the local Universe, galaxy properties show a strong dependence on
environment. In cluster cores, early type galaxies dominate, whereas
star-forming galaxies are more and more common in the outskirts. At higher
redshifts and in somewhat less dense env... | astro-ph_CO |
Multiple scattering Sunyaev-Zeldovich signal II: relativistic effects: We study the multiple scattering Sunyaev-Zeldovich (SZ) signature, extending
our previous analysis to high-temperature clusters. We consistently treat the
anisotropy of the ambient radiation field caused by the first scattering and
also consider low... | astro-ph_CO |
On the ISW-cluster cross-correlation in future surveys: We investigate the cosmological information contained in the
cross-correlation between the Integrated Sachs-Wolfe (ISW) of the Cosmic
Microwave Background (CMB) anisotropy pattern and galaxy clusters from future
wide surveys. Future surveys will provide cluster ca... | astro-ph_CO |
Constraint on $f(R)$ Gravity through the Redshift Space Distortion: In this paper, a specific family of $f(R)$ models that can produce the
$\Lambda$CDM background expansion history is constrained by using the currently
available geometric and dynamic probes. The scale dependence of the growth rate
$f(z,k)$ in this spec... | astro-ph_CO |
Cross identification between X-ray and Optical Clusters of Galaxies in
the SDSS DR7 Field: We use the ROSAT all sky survey X-ray cluster catalogs and the optical SDSS
DR7 galaxy and group catalogs to cross-identify X-ray clusters with their
optical counterparts, resulting in a sample of 201 X-ray clusters in the sky
... | astro-ph_CO |
Constraint on noncommutative spacetime from PLANCK data: We constrain the energy scale of noncommutativity of spacetime using CMB data
from PLANCK. We find that PLANCK data puts the lower bound on the
noncommutativity energy scale to about 20 TeV, which is about a factor of two
larger than a previous constraint that wa... | astro-ph_CO |
Outflowing Galactic Winds in Post-starburst and AGN Host Galaxies at
0.2<z<0.8: We present Keck/LRIS-B spectra for a sample of ten AEGIS X-ray AGN host
galaxies and thirteen post-starburst galaxies from SDSS and DEEP2 at 0.2<z<0.8
in order to investigate the presence, properties, and influence of outflowing
galactic ... | astro-ph_CO |
Constraining primordial magnetic fields with distortions of the
black-body spectrum of the cosmic microwave background: pre- and
post-decoupling contributions: Observational limits on $y$- and $\mu$-type distortions can constrain
properties of magnetic fields in the early universe. For a Gaussian, random,
and non-h... | astro-ph_CO |
Orbiting Circum-galactic Gas as a Signature of Cosmological Accretion: We use cosmological SPH simulations to study the kinematic signatures of cool
gas accretion onto a pair of well-resolved galaxy halos. Cold-flow streams and
gas-rich mergers produce a circum-galactic component of cool gas that generally
orbits with ... | astro-ph_CO |
Fast radio bursts as a cosmic probe?: We discuss the possibility of using fast radio bursts (FRBs), if
cosmological, as a viable cosmic probe. We find out that the contribution of
the host galaxies to the detected dispersion measures can be inapparent for the
FRBs not from galaxy centers or star forming regions. The in... | astro-ph_CO |
Inhomogeneous initial conditions for inflation: A wibbly-wobbly
timey-wimey path to salvation: We use the 3+1 formalism of numerical relativity to investigate the
robustness of Starobinsky and Higgs inflation to inhomogeneous initial
conditions, in the form of either field gradient or kinetic energy density.
Sub-Hubb... | astro-ph_CO |
Multi-messenger constraints on dark matter annihilation into
electron-positron pairs: We investigate the production of electrons and positrons in the Milky Way
within the context of dark matter annihilation. Upper limits on the relevant
cross-section are obtained by combining observational data at different
wavelengt... | astro-ph_CO |
Analyzing the Hubble tension through hidden sector dynamics in the early
universe: The recent analysis from the SH0ES Collaboration has confirmed the existence
of a Hubble tension between measurements at high redshift ($z> 1000$) and at
low redshift ($z<1$) at the $5\sigma$ level with the low redshift measurement
giv... | astro-ph_CO |
The First Stars May Shed Light on Dark Matter: Recent observations of hydrogen absorption that occurred when the first stars
turned on may give insights into the nature of dark matter. | astro-ph_CO |
The smearing scale in Laguerre reconstructions of the correlation
function: To a good approximation, on large cosmological scales the evolved two-point
correlation function of biased tracers is related to the initial one by a
convolution. For Gaussian initial conditions, the smearing kernel is Gaussian,
so if the ini... | astro-ph_CO |
On the Masses of Galaxies in the Local Universe: We compare estimates of stellar mass, Mstar, and dynamical mass,Mdyn,for a
sample of galaxies from the Sloan Digital Sky Survey (SDSS). We assume
dynamical homology (i.e., Mdyn = dispersion**2 * Reff, and we find a tight but
strongly non-linear relation: the best fit rel... | astro-ph_CO |
Low Masses and High Redshifts: The Evolution of the Mass-Metallicity
Relation: We present the first robust measurement of the high redshift mass-metallicity
(MZ) relation at 10^{8}< M/M_{\sun} < 10^{10}, obtained by stacking spectra of
83 emission-line galaxies with secure redshifts between 1.3 < z < 2.3. For
these r... | astro-ph_CO |
The Effective Theory of Inflation and the Dark Matter Status in the
Standard Model of the Universe: We present here the effective theory of inflation `a la Ginsburg-Landau in
which the inflaton potential is a polynomial. The slow-roll expansion becomes a
systematic 1/N expansion where N ~ 60. The spectral index and t... | astro-ph_CO |
Euclid Preparation. XXVIII. Forecasts for ten different higher-order
weak lensing statistics: Recent cosmic shear studies have shown that higher-order statistics (HOS)
developed by independent teams now outperform standard two-point estimators in
terms of statistical precision thanks to their sensitivity to the non-G... | astro-ph_CO |
Environmental dependence of bulge-dominated galaxy sizes in hierarchical
models of galaxy formation. Comparison with the local Universe: We compare state-of-the-art semi-analytic models of galaxy formation as well
as advanced sub-halo abundance matching models with a large sample of
early-type galaxies from SDSS at z... | astro-ph_CO |
Pressure Support vs. Thermal Broadening in the Lyman-alpha Forest II:
Effects of the Equation of State on Transverse Structure: We examine the impact of gas pressure on the transverse coherence of
high-redshift (2 <= z <= 4) Lyman-alpha forest absorption along neighboring
lines of sight that probe the gas Jeans scale... | astro-ph_CO |
CMB Polarization Systematics, Cosmological Birefringence and the
Gravitational Waves Background: Cosmic Microwave Background experiments must achieve very accurate
calibration of their polarization reference frame to avoid biasing the
cosmological parameters. In particular, a wrong or inaccurate calibration might
mim... | astro-ph_CO |
Dark Sector to Restore Cosmological Concordance: We develop a new phenomenological model that addresses current tensions
between observations of the early and late Universe. Our scenario features: (i)
a decaying dark energy fluid (DDE), which undergoes a transition at $z \sim
5,000$, to raise today's value of the Hubbl... | astro-ph_CO |
AGN feedback in clusters: shock and sound heating: Observations support the view that feedback, in the form of radio outbursts
from active nuclei in central galaxies, prevents catastrophic cooling of gas
and rapid star formation in many groups and clusters of galaxies. Variations in
jet power drive a succession of weak... | astro-ph_CO |
A detailed study of the bridge of excess X-ray emission between the
galaxy clusters Abell 2029 and Abell 2033: We examine Suzaku, XMM-Newton, and Chandra observations of the Abell
2029/2033 system to investigate the nature of a bridge of X-ray emission
joining the two galaxy clusters. By modelling the contributions f... | astro-ph_CO |
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... | astro-ph_CO |
Velocity Bias from the Small Scale Clustering of SDSS-III BOSS Galaxies: We present the measurements and modelling of the projected and redshift-space
clustering of CMASS galaxies in the Sloan Digital Sky Survey-III Baryon
Oscillation Spectroscopic Survey Data Release 11. For a volume-limited luminous
red galaxy sample... | astro-ph_CO |
A New Era in Extragalactic Background Light Measurements: The Cosmic
History of Accretion, Nucleosynthesis and Reionization: (Brief Summary) What is the total radiative content of the Universe since the
epoch of recombination? The extragalactic background light (EBL) spectrum
captures the redshifted energy released f... | astro-ph_CO |
Probing X-ray irradiation in the nucleus of NGC 1068 with observations
of high-J lines of dense gas tracers: With the incorporation of high-J molecular lines, we aim to constrain the
physical conditions of the dense gas in the central region of the Seyfert 2
galaxy NGC 1068 and to determine signatures of the AGN or t... | astro-ph_CO |
The Large-scale Distribution of Cool Gas around Luminous Red Galaxies: We present a measurement of the correlation function between luminous red
galaxies and cool gas traced by Mg II \lambda \lambda 2796, 2803 absorption, on
scales ranging from about 30 kpc to 20 Mpc. The measurement is based on
cross-correlating the p... | astro-ph_CO |
Random versus holographic fluctuations of the background metric. II.
Note on the dark energies arising due to microstructure of space-time: Over the last few years a certain class of dark-energy models decaying
inversely proportional to the square of the horizon distance emerged on the
basis either of Heisenberg unce... | astro-ph_CO |
A detailed view of filaments and sheets in the warm-hot intergalactic
medium. I. Pancake formation: Numerical simulations predict a considerable fraction of the missing baryons
at redshift z ~ 0 resting in the so called warm-hot intergalactic medium
(WHIM). The filaments and sheets of the WHIM have high temperatures ... | astro-ph_CO |
Measuring lensing ratios with future cosmological surveys: The ratio between the CMB lensing/galaxy counts and the galaxy shear/galaxy
counts cross-correlations combines the information from different cosmological
probes to infer cosmographic measurements that are less dependent on
astrophysical uncertainties and can c... | astro-ph_CO |
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