Luminosity distance
View article: Science with the space-based interferometer LISA. V. Extreme mass-ratio inspirals
Science with the space-based interferometer LISA. V. Extreme mass-ratio inspirals Open
The space-based Laser Interferometer Space Antenna (LISA) will be able to observe the gravitational-wave signals from systems comprised of a massive black hole and a stellar-mass compact object. These systems are known as extreme-mass-rati…
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Scalar-tensor theories and modified gravity in the wake of GW170817 Open
Theories of dark energy and modified gravity can be strongly constrained by astrophysical or cosmological observations, as illustrated by the recent observation of the gravitational wave event GW170817 and of its electromagnetic counterpar…
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Testing modified gravity at cosmological distances with LISA standard sirens Open
Modifications of General Relativity leave their imprint both on the cosmic expansion history through a non-trivial dark energy equation of state, and on the evolution of cosmological perturbations in the scalar and in the tensor sectors. S…
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Gravitational-wave luminosity distance in modified gravity theories Open
In modified gravity the propagation of gravitational waves (GWs) is in general different from that in general relativity. As a result, the luminosity distance for GWs can differ from that for electromagnetic signals, and is affected both b…
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The Distance to NGC 4993: The Host Galaxy of the Gravitational-wave Event GW170817 Open
The historic detection of gravitational waves from a binary neutron star merger (GW170817) and its electromagnetic counterpart led to the first accurate (sub-arcsecond) localization of a gravitational-wave event. The transient was found to…
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Localization accuracy of compact binary coalescences detected by the third-generation gravitational-wave detectors and implication for cosmology Open
We use the Fisher information matrix to investigate the angular resolution\nand luminosity distance uncertainty for coalescing binary neutron stars (BNSs)\nand neutron star-black hole binaries (NSBHs) detected by the third-generation\n(3G)…
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Local resolution of the Hubble tension: The impact of screened fifth forces on the cosmic distance ladder Open
The discrepancy between the values of the Hubble constant $H_0$ derived from\nthe local distance ladder and the cosmic microwave background provides a\ntantalising hint of new physics. We explore a potential resolution involving\nscreened …
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A new method to build the (inverse) distance ladder Open
The cosmic distance ladder is the succession of techniques by which it is possible to determine distances to astronomical objects. Here, we present a new method to build the cosmic distance ladder, going from local astrophysical measuremen…
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Measuring the speed of light with ultra-compact radio quasars Open
In this paper, based on a 2.29 GHz VLBI all-sky survey of 613 milliarcsecond\nultra-compact radio sources with $0.0035<z<3.787$, we describe a method of\nidentifying the sub-sample which can serve as individual standard rulers in\ncosmolog…
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Testing the general theory of relativity using gravitational wave propagation from dark standard sirens Open
Alternative theories of gravity predict modifications in the propagation of gravitational waves (GW) through space–time. One of the smoking-gun predictions of such theories is the change in the GW luminosity distance to GW sources as a fun…
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ΛCDM Cosmology for Astronomers Open
The homogeneous, isotropic, and flat $\\Lambda$CDM universe favored by\nobservations of the cosmic microwave background can be described using only\nEuclidean geometry, locally correct Newtonian mechanics, and the basic\npostulates of spec…
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FRB event rate counts – II. Fluence, redshift, and dispersion measure distributions Open
We examine how the various observable statistical properties of the FRB\npopulation relate back to their fundamental physical properties in a model\nindependent manner. We analyse the flux density and fluence distributions of\nFast Radio B…
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Comparison of thawing and freezing dark energy parametrizations Open
Dark energy equation of state $w(z)$ parametrizations with two parameters and\ngiven monotonicity are generically either convex or concave functions. This\nmakes them suitable for fitting either freezing or thawing quintessence models\nbut…
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Is cosmic acceleration proven by local cosmological probes? Open
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Constraining the time variation of Newton's constant<i>G</i>with gravitational-wave standard sirens and supernovae Open
The intrinsic peak luminosity of Type Ia supernovae (SNIa) depends on the value of Newton's gravitational constant G, through the Chandrasekhar mass MCh∝ G−3/2. If the luminosity distance can be independently determined, the SNIa can be tr…
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What can machine learning tell us about the background expansion of the Universe? Open
Machine learning (ML) algorithms have revolutionized the way we interpret data in astronomy, particle physics, biology, and even economics, since they can remove biases due to a priori chosen models. Here we apply a particular ML method, t…
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Testing Brans-Dicke gravity using the Einstein telescope Open
Gravitational radiation is an excellent field for testing theories of gravity in strong gravitational fields. The current observations on the gravitational-wave (GW) bursts by LIGO have already placed various constraints on the alternative…
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Cosmology-independent Estimate of the Fraction of Baryon Mass in the IGM from Fast Radio Burst Observations Open
The excessive dispersion measure (DM) of fast radio bursts (FRBs) has been proposed to be a powerful tool to study intergalactic medium (IGM) and to perform cosmography. One issue is that the fraction of baryons in the IGM, f IGM , is not …
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Measuring cosmological parameters with a luminosity–time correlation of gamma-ray bursts Open
Gamma-ray bursts (GRBs), as a possible probe to extend the Hubble diagram to high redshifts, have attracted much attention recently. In this paper, we select two samples of GRBs that have a plateau phase in X-ray afterglow. One is short GR…
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Unbiased Hubble constant estimation from binary neutron star mergers Open
Gravitational wave (GW) observations of binary neutron star (BNS) mergers can\nbe used to measure luminosity distances and hence, when coupled with estimates\nfor the mergers' host redshifts, infer the Hubble constant, $H_0$. These\nobserv…
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New observational constraints on f(T) cosmology from radio quasars Open
\n Using a new recently compiled milliarcsecond compact radio data set of 120 intermediate-luminosity quasars in the redshift range $$0.46< z <2.76$$, whose statistical linear sizes show negligible dependence on redshifts and intrinsic lum…
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Improving cosmological parameter estimation with the future gravitational-wave standard siren observation from the Einstein Telescope Open
Detection of gravitational waves produced by merger of binary compact objects could provide an independent way for measuring the luminosity distance to the gravitational-wave burst source, indicating that gravitational-wave observation, co…
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MUSE deep-fields: the Ly α luminosity function in the Hubble Deep Field-South at 2.91 < z < 6.64 Open
We present the first estimate of the Ly{\\alpha} luminosity function using\nblind spectroscopy from the Multi Unit Spectroscopic Explorer, MUSE, in the\nHubble Deep Field South. Using automatic source-detection software, we assemble\na hom…
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Gravitational-wave cosmography with LISA and the Hubble tension Open
We propose that stellar-mass binary black holes like GW150914 will become a\ntool to explore the local Universe within ~100Mpc in the era of the Laser\nInterferometer Space Antenna (LISA). High calibration accuracy and annual\nmotion of LI…
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Anisotropies of Gravitational-Wave Standard Sirens as a New Cosmological Probe without Redshift Information Open
Gravitational waves (GWs) from compact binary stars at cosmological distances are promising and powerful cosmological probes, referred to as the GW standard sirens. With future GW detectors, we will be able to precisely measure source lumi…
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Multipole decomposition of the general luminosity distance Hubble law — a new framework for observational cosmology Open
We present the luminosity distance series expansion to third order in redshift for a general space-time with no assumption on the metric tensor or the field equations prescribing it. It turns out that the coefficients of this general Hubbl…
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Cosmology-insensitive estimate of IGM baryon mass fraction from five localized fast radio bursts Open
Five fast radio bursts (FRBs), including three apparently non-repeating ones, FRB 180924, FRB 181112, and FRB 190523, and two repeaters, FRB 121102 and FRB 180916.J0158+65, have already been localized so far. We apply a method developed re…
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Gaussian processes reconstruction of modified gravitational wave propagation Open
Recent work has shown that modified gravitational wave (GW) propagation can\nbe a powerful probe of dark energy and modified gravity, specific to GW\nobservations. We use the technique of Gaussian processes, that allows the\nreconstruction…
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Probing the cosmic distance duality with strong gravitational lensing and supernovae Ia data Open
We propose and perform a new test of the cosmic distance-duality relation (CDDR), $D_L(z) / D_A(z) (1 + z)^{2} = 1$, where $D_A$ is the angular diameter distance and $D_L$ is the luminosity distance to a given source at redshift $z$, using…
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Cosmological memory effect Open
The "memory effect" is the permanent change in the relative separation of test particles resulting from the passage of gravitational radiation. We investigate the memory effect for a general, spatially flat FLRW cosmology by considering th…