PhysBERT
Collection
7 items • Updated • 1
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Implications of Planck2015 for inflationary, ekpyrotic and anamorphic
bouncing cosmologies: The results from Planck2015, when combined with earlier observations from
WMAP, ACT, SPT and other experiments, were the first observations to disfavor
the "classic" inflationary paradigm. To satisfy the observational constrai... | astro-ph_CO |
The spectacular cluster chain Abell 781 as observed with LOFAR, GMRT,
and XMM-Newton: A number of merging galaxy clusters show the presence of large-scale radio
emission associated with the intra-cluster medium (ICM). These synchrotron
sources are generally classified as radio haloes and radio relics. Whilst it is
co... | astro-ph_CO |
Sound velocity effects on the phase transition gravitational wave
spectrum in the sound shell model: A cosmological first-order phase transition gravitational wave could provide
a novel approach to studying the early Universe. In most cases, the acoustic
gravitational wave from the sound wave mechanism is dominant. C... | astro-ph_CO |
Spinning primordial black holes formed during a matter-dominated era: We study the formation of spinning primordial black holes during an early
matter-dominated era. Using non-linear 3+1D general relativistic simulations,
we compute the efficiency of mass and angular momentum transfer in the process
-- which we find to... | astro-ph_CO |
Detectability of Gravitational Waves from High-Redshift Binaries: Recent non-detection of gravitational-wave backgrounds from pulsar timing
arrays casts further uncertainty on the evolution of supermassive black hole
binaries. We study the capabilities of current gravitational-wave observatories
to detect individual bi... | astro-ph_CO |
Thermal Fluctuations of Dark Matter in Bouncing Cosmology: We investigate the statistical nature of the dark matter particles produced
in bouncing cosmology, especially, the evolution of its thermal fluctuations.
By explicitly deriving and solving the equation of motion of super-horizon
mode, we fully determine the evo... | astro-ph_CO |
Precision growth index using the clustering of cosmic structures and
growth data: We use the clustering properties of Luminous Red Galaxies (LRGs) and the
growth rate data provided by the various galaxy surveys in order to constrain
the growth index ($\gamma$) of the linear matter fluctuations. We perform a
standard ... | astro-ph_CO |
The Atlas3D project - XV. Benchmark for early-type galaxies scaling
relations from 260 dynamical models: mass-to-light ratio, dark matter,
Fundamental Plane and Mass Plane: We study the volume-limited and nearly mass selected (stellar mass M>6*10^9
Msun) Atlas3D sample of 260 early-type galaxies. We construct detai... | astro-ph_CO |
Dark energy, integrated Sachs-Wolfe effect and large-scale magnetic
fields: The impact of large-scale magnetic fields on the interplay between the
ordinary and integrated Sachs-Wolfe effects is investigated in the presence of
a fluctuating dark energy component. The modified initial conditions of the
Einstein-Boltzma... | astro-ph_CO |
Exacerbating the cosmological constant problem with interacting dark
energy: Future cosmological surveys will probe the expansion history of the universe
and constrain phenomenological models of dark energy. Such models do not
address the fine-tuning problem of the vacuum energy, i.e. the cosmological
constant proble... | astro-ph_CO |
Galaxy Zoo and ALFALFA: Atomic Gas and the Regulation of Star Formation
in Barred Disc Galaxies: We study the observed correlation between atomic gas content and the
likelihood of hosting a large scale bar in a sample of 2090 disc galaxies. Such
a test has never been done before on this scale. We use data on morpholo... | astro-ph_CO |
[FeII] as a tracer supernova rate: Supernovae play an integral role in the feedback of processed material into
the ISMof galaxies and are responsible for most of the chemical enrichment of
the universe. The rate of supernovae can also reveal the star formation
histories. Supernova rate is usually measured through the n... | astro-ph_CO |
Haro15: Is it actually a low metallicity galaxy?: We present a detailed study of the physical properties of the nebular
material in multiple knots of the blue compact dwarf galaxy Haro 15. Using long
slit and echelle spectroscopy, obtained at Las Campanas Observatory, we study
the physical conditions (electron density ... | astro-ph_CO |
Constraints on primordial black holes and curvature perturbations from
the global 21cm signal: The recent observations of the global 21cm signal by EDGES and gravitational
waves by LIGO/VIGO have revived interest in PBHs. Different from previous
works, we investigate the influence of PBHs on the evolution of the IGM ... | astro-ph_CO |
Constraining the Black Hole Mass Spectrum with LISA Observations II:
Direct comparison of detailed models: A number of scenarios have been proposed for the origin of the supermassive
black holes (SMBHs) that are found in the centres of most galaxies. Many such
scenarios predict a high-redshift population of massive b... | astro-ph_CO |
Detecting Baryon Acoustic Oscillations in Dark Matter from Kinematic
Weak Lensing Surveys: We investigate the feasibility of extracting Baryon Acoustic Oscillations
(BAO) from cosmic shear tomography. We particularly focus on the BAO scale
precision that can be achieved by future spectroscopy-based, kinematic weak
le... | astro-ph_CO |
Revisiting Primordial Black Holes Constraints from Ionization History: Much attention has been drawn to the recent discoveries by the Advanced Laser
Interferometer Gravitational-Wave Observatory (LIGO) of merging intermediate
mass black holes. Of particular interest is the possibility that the merger
events detected co... | astro-ph_CO |
Energy-conservation constraints on cosmic string loop production and
distribution functions: A network of cosmic strings would lead to gravitational waves which may be
detected by pulsar timing or future interferometers. The details of the
gravitational wave signal depend on the distribution of cosmic string loops,
w... | astro-ph_CO |
Observations of flat-spectrum radio sources at 850 microns from the
James Clerk Maxwell Telescope II. April 2000 to June 2005: Calibrated data for 143 flat-spectrum extragalactic radio sources are
presented at a wavelength of 850 microns covering a five-year period from April
2000. The data, obtained at the James Cle... | astro-ph_CO |
The accretion of dark matter subhaloes within the cosmic web: primordial
anisotropic distribution and its universality: The distribution of galaxies displays anisotropy on different scales and it
is often referred as galaxy alignment. To understand the origin of galaxy
alignments on small scales, one must investigate... | astro-ph_CO |
Non-parametric Lagrangian biasing from the insights of neural nets: We present a Lagrangian model of galaxy clustering bias in which we train a
neural net using the local properties of the smoothed initial density field to
predict the late-time mass-weighted halo field. By fitting the mass-weighted
halo field in the Ab... | astro-ph_CO |
On the Sunyaev-Zel'dovich effect from dark matter annihilation or decay
in galaxy clusters: We revisit the prospects for detecting the Sunyaev Zel'dovich (SZ) effect
induced by dark matter (DM) annihilation or decay. We show that with standard
(or even extreme) assumptions for DM properties, the optical depth associa... | astro-ph_CO |
Multi-scale initial conditions for cosmological simulations: We discuss a new algorithm to generate multi-scale initial conditions with
multiple levels of refinements for cosmological "zoom-in" simulations. The
method uses an adaptive convolution of Gaussian white noise with a real space
transfer function kernel togeth... | astro-ph_CO |
Primordial non-Gaussianity and Bispectrum Measurements in the Cosmic
Microwave Background and Large-Scale Structure: The most direct probe of non-Gaussian initial conditions has come from
bispectrum measurements of temperature fluctuations in the Cosmic Microwave
Background and of the matter and galaxy distribution a... | astro-ph_CO |
Galaxy-galaxy weak gravitational lensing in $f(R)$ gravity: We present an analysis of galaxy-galaxy weak gravitational lensing (GGL) in
chameleon $f(R)$ gravity - a leading candidate of non-standard gravity models.
For the analysis we have created mock galaxy catalogues based on dark matter
haloes from two sets of nume... | astro-ph_CO |
Evolution of gaseous disk viscosity driven by supernova explosion in
star-forming galaxies at high redshift: Motivated by Genzel et al.'s observations of high-redshift star-forming
galaxies, containing clumpy and turbulent rings or disks, we build a set of
equations describing the dynamical evolution of gaseous disks... | astro-ph_CO |
Extensions to models of the galaxy-halo connection: We explore two widely used empirical models for the galaxy-halo connection,
subhalo abundance matching (SHAM) and the halo occupation distribution (HOD)
and compare their predictions with the hydrodynamical simulation IllustrisTNG
(TNG) for a range of statistics that ... | astro-ph_CO |
GRB Probes of the Early Universe with EXIST: With the Swift detection of GRB090423 at z = 8.2, it was confirmed that GRBs
are now detectable at (significantly) larger redshifts than AGN, and so can
indeed be used as probes of the Early Universe. The proposed Energetic X-ray
Imaging Survey Telescope (EXIST) mission has ... | astro-ph_CO |
Imprint of Scalar Dark Energy on Cosmic Microwave Background
Polarization: We study the imprint of a coupling of scalar dark energy to photon on the
cosmic microwave background (CMB) polarization. The time-evolving field value
as well as the perturbation of the scalar generically induce $B$-mode
polarization. Future ... | astro-ph_CO |
The Herschel Virgo Cluster Survey: I. Luminosity functions: We describe the Herschel Virgo Cluster Survey (HeViCS) and the first data
obtained as part of the Science Demonstration Phase (SDP). The data cover a
central 4x4 sq deg region of the cluster. We use SPIRE and PACS photometry data
to produce 100, 160, 250, 350 ... | astro-ph_CO |
Simulations of primary beam effects on the cosmic bispectrum phase
observed with the Hydrogen Epoch of Reionization Array: The 21~cm transition from neutral Hydrogen promises to be the best
observational probe of the Epoch of Reionisation. The main difficulty in
measuring the 21 cm signal is the presence of bright fo... | astro-ph_CO |
The Clowes-Campusano Large Quasar Group Survey: I. GALEX selected sample
of LBGs at z$\sim$1: The nature of galaxy structures on large scales is a key observational
prediction for current models of galaxy formation. The SDSS and 2dF galaxy
surveys have revealed a number of structures on 40-150 h^-1 Mpc scales at low
... | astro-ph_CO |
The (relative) size does not matter in inflation: We show that a tiny correction to the inflaton potential can make critical
changes in the inflationary observables for some types of inflation models. | astro-ph_CO |
Constraining Dark-Matter Ensembles with Supernova Data: The constraints on non-minimal dark sectors involving ensembles of unstable
dark-matter species are well established and quite stringent in cases in which
these species decay to visible-sector particles. However, in cases in which
these ensembles decay exclusively... | astro-ph_CO |
The chemical evolution of IC10: Dwarf irregular galaxies are relatively simple unevolved objects where it is
easy to test models of galactic chemical evolution. We attempt to determine the
star formation and gas accretion history of IC10, a local dwarf irregular for
which abundance, gas, and mass determinations are ava... | astro-ph_CO |
The formation of CDM haloes I: Collapse thresholds and the ellipsoidal
collapse model: In the excursion set approach to structure formation initially spherical
regions of the linear density field collapse to form haloes of mass $M$ at
redshift $z_{\rm id}$ if their linearly extrapolated density contrast, averaged
on ... | astro-ph_CO |
Circular Polarization of the Astrophysical Gravitational Wave Background: The circular polarization of gravitational waves is a powerful observable to
test parity violation in gravity and to distinguish between the primordial or
the astrophysical origin of the stochastic background. This property comes from
the expecte... | astro-ph_CO |
Going beyond the Kaiser redshift-space distortion formula: a full
general relativistic account of the effects and their detectability in galaxy
clustering: Kaiser redshift-space distortion formula describes well the clustering of
galaxies in redshift surveys on small scales, but there are numerous additional
terms ... | astro-ph_CO |
Mass-radius relation of Newtonian self-gravitating Bose-Einstein
condensates with short-range interactions: II. Numerical results: We develop the suggestion that dark matter could be a Bose-Einstein
condensate. We determine the mass-radius relation of a Newtonian
self-gravitating Bose-Einstein condensate with short-r... | astro-ph_CO |
Extended Light in E/S0 Galaxies and Implications for Disk Rebirth: The recent discovery of extended ultraviolet (XUV) disks around a large
fraction of late-type galaxies provides evidence for unexpectedly large-scale
disk building at recent epochs. Combining GALEX UV observations with deep
optical and Spitzer IR imagin... | astro-ph_CO |
The ATLAS Survey of the CDFS and ELAIS-S1 Fields: The first phase of the ATLAS (Australia Telescope Large Area Survey) project
surveyed a total 7 square degrees down to 30 micro Jy rms at 1.4 GHz and is the
largest sensitive radio survey ever attempted. We report on the scientific
achievements of ATLAS to date and plan... | astro-ph_CO |
Constraints on parity violation from ACTpol and forecasts for
forthcoming CMB experiments: We use the ACTpol published cosmic microwave background (CMB) polarization
data to constrain cosmological birefringence, a tracer of parity violation
beyond the standard model of particle physics. To this purpose, we employ all... | astro-ph_CO |
Cosmological evidence for leptonic asymmetry after Planck: Recently, the Planck satellite found a larger and most precise value of the
matter energy density, that impacts on the present values of other cosmological
parameters such as the Hubble constant, the present cluster abundances and the
age of the Universe. The e... | astro-ph_CO |
Intergalactic stellar populations in intermediate redshift clusters: A substantial fraction of the total stellar mass in rich clusters of galaxies
resides in a diffuse intergalactic component usually referred to as the
Intra-Cluster Light (ICL). Theoretical models indicate that these intergalactic
stars originate mostl... | astro-ph_CO |
The evolution of the star forming sequence in hierarchical galaxy
formation models: It has been argued that the specific star formation rates of star forming
galaxies inferred from observational data decline more rapidly below z = 2 than
is predicted by hierarchical galaxy formation models. We present a detailed
anal... | astro-ph_CO |
Probing primordial features with the primary CMB: CMB photons travel from the last scattering surface, when the primary CMB has
been generated, along the surface of the light cone to us. During their travel,
they are affected by many secondary effects such as the integrated Sachs-Wolfe
effect and CMB lensing. These CMB... | astro-ph_CO |
Halo/Galaxy Bispectrum with Primordial non-Gaussianity from integrated
Perturbation Theory (iPT): We derive a formula for the halo/galaxy bispectrum on the basis of the
integrated Perturbation Theory (iPT). In addition to the gravity-induced
non-Gaussianity, we consider the non-Gaussianity of the primordial curvature... | astro-ph_CO |
Power Spectra beyond the Slow Roll Approximation in Theories with
Non-Canonical Kinetic Terms: We derive analytical expressions for the power spectra at the end of
inflation in theories with two inflaton fields and non-canonical kinetic terms.
We find that going beyond the slow-roll approximation is necessary and tha... | astro-ph_CO |
Herschel-ATLAS/GAMA: a census of dust in optically selected galaxies
from stacking at submillimetre wavelengths: We use the Herschel-ATLAS survey to conduct the first large-scale statistical
study of the submm properties of optically selected galaxies. Using ~80,000
r-band selected galaxies from 126 deg^2 of the GAMA... | astro-ph_CO |
Constraints on the Redshift Evolution of the L_X-SFR Relation from the
Cosmic X-Ray Backgrounds: Observations of local star forming galaxies have revealed a correlation
between the rate at which galaxies form stars and their X-Ray luminosity. We
combine this correlation with the most recent observational constraints ... | astro-ph_CO |
Gamma rays from ultracompact primordial dark matter minihalos: Ultracompact minihalos have recently been proposed as a new class of dark
matter structure. These minihalos would be produced by phase transitions in the
early Universe or features in the inflaton potential, and constitute
non-baryonic massive compact halo ... | astro-ph_CO |
Reconstruction of high-resolution SZ maps from heterogeneous datasets
using needlets: The aim of this work is to propose a joint exploitation of heterogeneous
datasets from high-resolution/few-channel experiments and
low-resolution/many-channel experiments by using a multiscale needlet Internal
Linear Combination (IL... | astro-ph_CO |
Star Formation in Nearby Isolated Galaxies: We use the FUV fluxes measured with the GALEX to study the star formation
properties of galaxies collected in the "Local Orphan Galaxies" catalog (LOG).
Among 517 LOG galaxies having radial velocities V(LG) < 3500 km/s and Galactic
latitudes |b|> 15 degr, 428 objects have bee... | astro-ph_CO |
Supervoids in the WISE-2MASS catalogue imprinting Cold Spots in the
Cosmic Microwave Background: The Cold Spot (CS) is a clear feature in the Cosmic Microwave Background
(CMB); it could be of primordial origin, or caused by a intervening structure
along the line of sight. We identified a large projected underdensity ... | astro-ph_CO |
Warm Dark Matter as a solution to the small scale crisis: new
constraints from high redshift Lyman-alpha forest data: We present updated constraints on the free-streaming of warm dark matter
(WDM) particles derived from an analysis of the Lya flux power spectrum
measured from high-resolution spectra of 25 z > 4 quasa... | astro-ph_CO |
The strongest gravitational lenses: I. The statistical impact of cluster
mergers: For more than a decade now, it has been controversial whether or not the high
rate of giant gravitational arcs and the largest observed Einstein radii are
consistent with the standard cosmological model. Recent studies indicate that
mer... | astro-ph_CO |
Very High Energy Active Galactic Nuclei Synchrotron self-Compton
Modeling Tour: The current very high energy (VHE; E>100GeV) experiments have tremendously
increased the number of detected extragalactic sources. We present a
synchrotron self-Compton modeling tour of the active galactic nuclei currently
established as ... | astro-ph_CO |
Modeling the Alignment Profile of Satellite Galaxies in Clusters: Analyzing the halo and galaxy catalogs from the Millennium simulations at
redshifts $z=0,\ 0.5,\ 1$, we determine the alignment profiles of cluster
galaxies by measuring the average alignments between the major axes of the
pseudo inertia tensors from all... | astro-ph_CO |
Searching for Anisotropic Cosmic Birefringence with Polarization Data
from SPTpol: We present a search for anisotropic cosmic birefringence in 500 deg$^2$ of
southern sky observed at 150 GHz with the SPTpol camera on the South Pole
Telescope. We reconstruct a map of cosmic polarization rotation anisotropies
using hig... | astro-ph_CO |
Large Field Polynomial Inflation: Parameter Space, Predictions and
(Double) Eternal Nature: Simple monomial inflationary scenarios have been ruled out by recent
observations. In this work we revisit the next simplest scenario, a
single--field model where the scalar potential is a polynomial of degree four
which featu... | astro-ph_CO |
Supernova 2011fe from an Exploding Carbon-Oxygen White Dwarf Star: Type Ia supernovae (SNe Ia) have been used empirically as standardized
candles to reveal the accelerating universe even though fundamental details,
such as the nature of the progenitor system and how the star explodes, remained
a mystery. There is conse... | astro-ph_CO |
Results of optical monitoring of 5 SDSS double QSOs with the Nordic
Optical Telescope: We present optical R-band light curves of five SDSS double QSOs (SDSS
J0903+5028, SDSS J1001+5027, SDSS J1206+4332, SDSS J1353+1138, SDSS J1335+0118)
obtained from monitoring at the Nordic Optical Telescope (NOT) between
September ... | astro-ph_CO |
Mining the Herschel-ATLAS: submillimeter-selected blazars in equatorial
fields: The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) provides an
unprecedented opportunity to search for blazars at sub-mm wavelengths. We
cross-matched the FIRST radio source catalogue with the 11655 sources brighter
than 35 ... | astro-ph_CO |
Gödel-type universes and chronology protection in Horava-Lifshitz
gravity: In the attempts toward a quantum gravity theory, general relativity faces a
serious difficulty since it is non-renormalizable theory. Ho\v{r}ava-Lifshitz
gravity offers a framework to circumvent this difficulty, by sacrificing the
local Lorent... | astro-ph_CO |
The HBI in a quasi-global model of the intracluster medium: In this paper we investigate how convective instabilities influence heat
conduction in the intracluster medium (ICM) of cool-core galaxy clusters. The
ICM is a high-beta, weakly collisional plasma in which the transport of
momentum and heat is aligned with the... | astro-ph_CO |
The Case for Standard Irradiated Accretion Disks in Active Galactic
Nuclei: We analyze the broadband photometric light curves of Seyfert 1 galaxies from
the Sergeev et al. (2005) sample and find that a) perturbations propagating
across the continuum emitting region are a general phenomenon securely detected
in most c... | astro-ph_CO |
Are there cool-core clusters at high-redshift? Chandra results and
prospects with WFXT: In this contribution we trace the evolution of cool-core clusters out to
z~1.3 using high-resolution Chandra data of three representative cluster
samples spanning different redshift ranges. Our analysis is based on the
measurement... | astro-ph_CO |
Research Update on Extreme-Mass-Ratio Inspirals: The inspirals of stellar-mass mass compact objects into massive black holes
in the centres of galaxies are one of the most important sources of
gravitational radiation for space-based detectors like LISA or eLISA. These
extreme-mass-ratio inspirals (EMRIs) will enable an... | astro-ph_CO |
Cosmological consequences of a scalar field with oscillating equation of
state: A possible solution to the fine-tuning and coincidence problems: We propose a new dark energy model for solving the cosmological fine-tuning
and coincidence problems. A default assumption is that the fine-tuning problem
disappears if we d... | astro-ph_CO |
Bogoliubov Excited States and the Lyth Bound: We show that Bogoliubov excited scalar and tensor modes do not alleviate
Planckian evolution during inflation if one assumes that $r$ and the Bogoliubov
coefficients are approximately scale invariant. We constrain the excitation
parameter for the scalar fluctuations, $\beta... | astro-ph_CO |
Formation of disk galaxies in preheated media: a preventative feedback
model: We introduce a semi-analytic galaxy formation model implementing a
self-consistent treatment for the hot halo gas configuration and the assembly
of central disks. Using the model, we explore a preventative feedback model, in
which the circu... | astro-ph_CO |
Kinematic consistency relations of large-scale structures: We describe how the kinematic consistency relations satisfied by density
correlations of the large-scale structures of the Universe can be derived
within the usual Newtonian framework. These relations express a kinematic
effect and show how the $(\ell+n)$-densi... | astro-ph_CO |
Perturbative Resonance in WIMP paradigm and its Cosmological
Implications on Cosmic Reheating and Primordial Gravitational Wave Detection: We investigate the co-evolution of dark matter (DM) density perturbation and
metric perturbation in the WIMP paradigm. Instead of adopting the conventional
assumption that DM star... | astro-ph_CO |
Preparing old and recent radio source tables for the VO age: Current
status: Independent of established data centers, and partly for my own research, I
have been collecting the tabular data from nearly 1500 articles concerned with
radio sources. Optical character recognition (OCR) was used to recover tables
from near... | astro-ph_CO |
Detecting Baryon Acoustic Oscillations in Dark Matter from Kinematic
Weak Lensing Surveys: We investigate the feasibility of extracting Baryon Acoustic Oscillations
(BAO) from cosmic shear tomography. We particularly focus on the BAO scale
precision that can be achieved by future spectroscopy-based, kinematic weak
le... | astro-ph_CO |
Galaxy and Mass Assembly (GAMA): Dust obscuration in galaxies and their
recent star formation histories: We present self-consistent star formation rates derived through pan-spectral
analysis of galaxies drawn from the Galaxy and Mass Assembly (GAMA) survey. We
determine the most appropriate form of dust obscuration c... | astro-ph_CO |
Far-Infrared Properties of Spitzer-selected Luminous Starbursts: We present SHARC-2 350 micron data on 20 luminous z ~ 2 starbursts with
S(1.2mm) > 2 mJy from the Spitzer-selected samples of Lonsdale et al. and
Fiolet et al. All the sources were detected, with S(350um) > 25 mJy for 18 of
them. With the data, we determi... | astro-ph_CO |
Cosmological constraints from large-scale structure growth rate
measurements: We compile a list of $14$ independent measurements of large-scale structure
growth rate between redshifts $0.067 \leq z \leq 0.8$ and use this to place
constraints on model parameters of constant and time-evolving
general-relativistic dark ... | astro-ph_CO |
On the Contribution of Active Galactic Nuclei to the High-Redshift
Metagalactic Ionizing Background: Motivated by the claimed detection of a large population of faint active
galactic nuclei (AGN) at high redshift, recent studies have proposed models in
which AGN contribute significantly to the z > 4 H I ionizing back... | astro-ph_CO |
Baryonic effects for weak lensing. Part II. Combination with X-ray data
and extended cosmologies: An accurate modelling of baryonic feedback effects is required to exploit the
full potential of future weak-lensing surveys such as Euclid or LSST. In this
second paper in a series of two, we combine Euclid-like mock dat... | astro-ph_CO |
Quasi-evaporating black holes and cold dark matter: Vilkovisky has claimed to have solved the black hole backreaction problem and
finds that black holes lose only ten percent of their mass to Hawking radiation
before evaporation ceases. We examine the implications of this scenario for
cold dark matter, assuming that pr... | astro-ph_CO |
Doubling Strong Lensing as a Cosmological Probe: Strong gravitational lensing provides a geometric probe of cosmology in a
unique manner through distance ratios involving the source and lens. This is
well known for the time delay distance derived from measured delays between
lightcurves of the images of variable source... | astro-ph_CO |
Correlation of AGN Jet Power with the Entropy Profile in Cooling Flow
Clusters: We find that the power of jets that inflate bubble pairs in cooling flow
clusters of galaxies correlates with the size of the inner region where the
entropy profile is flat, as well as with the gas mass in that region and the
entropy floo... | astro-ph_CO |
Hubble parameter reconstruction from a principal component analysis:
minimizing the bias: A model-independent reconstruction of the cosmic expansion rate is essential
to a robust analysis of cosmological observations. Our goal is to demonstrate
that current data are able to provide reasonable constraints on the behav... | astro-ph_CO |
A new catalogue of polar-ring galaxies selected from the SDSS: (Abridged) Galaxies with polar rings (PRGs) are a unique class of
extragalactic objects allowing to investigate a wide range of problems, linked
with the formation and evolution of galaxies, and to study the properties of
their dark haloes. The progress in ... | astro-ph_CO |
Cosmic Radio Background from Primordial Black Holes at Cosmic Dawn: The presence of an extra radio background besides the cosmic microwave
background has important implications for the observation of the 21-cm signal
during the cosmic Dark Ages, Cosmic Dawn, and epoch of Reionization. The strong
absorption trough found... | astro-ph_CO |
HST Morphologies of z ~ 2 Dust-Obscured Galaxies II: Bump Sources: We present Hubble Space Telescope (HST) imaging of 22 ultra-luminous infrared
galaxies (ULIRGs) at z~2 with extremely red R-[24] colors (called dust-obscured
galaxies, or DOGs) which have a local maximum in their spectral energy
distribution (SED) at re... | astro-ph_CO |
Cosmological Evolution With Interaction Between Dark Energy And Dark
Matter: In this review we consider in detail different theoretical topics associated
with interaction in the dark sector. We study linear and nonlinear interactions
which depend on the dark matter and dark energy densities. We consider a number
of d... | astro-ph_CO |
A Density Independent Formulation of Smoothed Particle Hydrodynamics: The standard formulation of the smoothed particle hydrodynamics (SPH) assumes
that the local density distribution is differentiable. This assumption is used
to derive the spatial derivatives of other quantities. However, this assumption
breaks down a... | astro-ph_CO |
Neutrino clustering around spherical dark matter halos: Cold dark matter halos form within a smoothly distributed background of relic
neutrinos -- at least some of which are massive and non-relativistic at late
times. We calculate the accumulation of massive neutrinos around spherically
collapsing cold dark matter halo... | astro-ph_CO |
zCOSMOS 20k: Satellite galaxies are the main drivers of environmental
effects in the galaxy population at least to z~0.7: We explore the role of environment in the evolution of galaxies over
0.1<z<0.7 using the final zCOSMOS-bright data set. Using the red fraction of
galaxies as a proxy for the quenched population, w... | astro-ph_CO |
Observability of lensing of gravitational waves from massive black hole
binaries with LISA: The gravitational waves emitted by massive black hole binaries in the LISA
band can be lensed. Wave-optics effects in the lensed signal are crucial when
the Schwarzschild radius of the lens is smaller than the wavelength of th... | astro-ph_CO |
Why a Windy Torus?: Mass ejection in the form of winds or jets appears to be as fundamental to
quasar activity as accretion, and can be directly observed in many objects with
broadened and blue-shifted UV absorption features. A convincing argument for
radiation pressure driving this ionized outflow can be made within t... | astro-ph_CO |
Generalised DBI-Quintessence: We investigate the phase space of a quintessence theory governed by a
generalised version of the DBI action, using a combination of numeric and
analytic methods. The additional degrees of freedom lead to a vastly richer
phase space structure, where the field covers the full equation of sta... | astro-ph_CO |
ALMA follows streaming of dense gas down to 40 pc from the supermassive
black hole in NGC1097: We present a kinematic analysis of the dense molecular gas in the central 200
parsecs of the nearby galaxy NGC1097, based on Cycle 0 observations with the
Atacama Large Millimeter/sub-millimeter Array (ALMA). We use the HCN... | astro-ph_CO |
Planck 2018 constraints on anisotropic birefringence and its
cross-correlation with CMB anisotropy: Parity-violating extensions of standard electromagnetism produce cosmic
birefringence, the in vacuo rotation of the linear polarisation direction of a
photon during propagation. We employ {\it Planck} 2018 CMB polarise... | astro-ph_CO |
Biased Tracers and Time Evolution: We study the effect of time evolution on galaxy bias. We argue that at any
order in perturbations, the galaxy density contrast can be expressed in terms
of a finite set of locally measurable operators made of spatial and temporal
derivatives of the Newtonian potential. This is checked... | astro-ph_CO |
Aemulus $ν$: Precise Predictions for Matter and Biased Tracer Power
Spectra in the Presence of Neutrinos: We present the Aemulus $\nu$ simulations: a suite of 150 $(1.05 h^{-1}\rm
Gpc)^3$ $N$-body simulations with a mass resolution of $3.51\times 10^{10}
\frac{\Omega_{cb}}{0.3} ~ h^{-1} M_{\odot}$ in a $w\nu$CDM cosm... | astro-ph_CO |
Detection of spatial correlations of fundamental plane residuals, and
cosmological implications: The fundamental plane (FP) is a widely used tool to investigate the
properties of early-type galaxies, and the tight relation between its
parameters has spawned several cosmological applications, including its use as
a di... | astro-ph_CO |
Cosmology of Single Species Hidden Dark Matter: Cosmology and astrophysics provide various ways to study the properties of
dark matter even if they have negligible non-gravitational interactions with
the Standard Model particles and remain hidden. We study a type of hidden dark
matter model in which the dark matter is ... | astro-ph_CO |
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