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View article: The NANOGrav 15 yr Data Set: Search for Gravitational-wave Memory
The NANOGrav 15 yr Data Set: Search for Gravitational-wave Memory Open
We present the results of a search for nonlinear gravitational-wave (GW) memory in the NANOGrav 15 yr data set. We find no significant evidence for memory signals in the data set, with a maximum Bayes factor of 3.1 in favor of a model incl…
View article: The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations
The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations Open
Pulsar timing array observations have found evidence for an isotropic gravitational-wave background with the Hellings–Downs angular correlations between pulsar pairs. This interpretation hinges on the measured shape of the angular correlat…
View article: Searching beyond the fiducial stochastic gravitational wave background in pulsar timing array data using likelihood reweighting
Searching beyond the fiducial stochastic gravitational wave background in pulsar timing array data using likelihood reweighting Open
Since the recent announcements of evidence for a stochastic gravitational wave background from several pulsar timing array collaborations, much effort has been devoted to explore features beyond the fiducial Hellings-Downs background inclu…
View article: Sound waves from primordial black hole formations
Sound waves from primordial black hole formations Open
We present a numerical investigation of primordial black hole (PBH) formation from super-horizon curvature perturbations and the subsequent generation and propagation of sound waves, which can serve as a new source of stochastic gravitatio…
View article: Relic gravitational waves from primordial gravitational collapses
Relic gravitational waves from primordial gravitational collapses Open
A large primordial density perturbation of the Hubble scale will gravitationally collapse, generating an outgoing sound shell whether or not a primordial black hole (PBH) is formed. In this Letter, we report a new source of the stochastic …
View article: The NANOGrav 15-year Data Set: Search for Gravitational Wave Memory
The NANOGrav 15-year Data Set: Search for Gravitational Wave Memory Open
We present the results of a search for nonlinear gravitational wave memory in the NANOGrav 15-year data set. We find no significant evidence for memory signals in the dataset, with a maximum Bayes factor of 3.1 in favor of a model includin…
View article: The NANOGrav 15 yr Data Set: Running of the Spectral Index
The NANOGrav 15 yr Data Set: Running of the Spectral Index Open
The NANOGrav 15 yr data provide compelling evidence for a stochastic gravitational-wave (GW) background at nanohertz frequencies. The simplest model-independent approach to characterizing the frequency spectrum of this signal consists of a…
View article: The NANOGrav 15 Yr Data Set: Removing Pulsars One by One from the Pulsar Timing Array
The NANOGrav 15 Yr Data Set: Removing Pulsars One by One from the Pulsar Timing Array Open
Evidence has emerged for a stochastic signal correlated among 67 pulsars within the 15 yr pulsar-timing data set compiled by the NANOGrav collaboration. Similar signals have been found in data from the European, Indian, Parkes, and Chinese…
View article: The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the Gravitational-wave Background
The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the Gravitational-wave Background Open
The cosmic merger history of supermassive black hole binaries (SMBHBs) is expected to produce a low-frequency gravitational wave background (GWB). Here we investigate how signs of the discrete nature of this GWB can manifest in pulsar timi…
View article: The NANOGrav 15 Yr Data Set: Removing Pulsars One by One from the Pulsar Timing Array
The NANOGrav 15 Yr Data Set: Removing Pulsars One by One from the Pulsar Timing Array Open
Evidence has emerged for a stochastic signal correlated among 67 pulsars within the 15-year pulsar-timing data set compiled by the NANOGrav collaboration. Similar signals have been found in data from the European, Indian, Parkes, and Chine…
View article: The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations
The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations Open
Pulsar timing array observations have found evidence for an isotropic gravitational wave background with the Hellings-Downs angular correlations, expected from general relativity. This interpretation hinges on the measured shape of the ang…
View article: Galaxy Tomography with the Gravitational Wave Background from Supermassive Black Hole Binaries
Galaxy Tomography with the Gravitational Wave Background from Supermassive Black Hole Binaries Open
The detection of a stochastic gravitational wave background by pulsar timing arrays suggests the presence of a supermassive black hole binary population. Although the observed spectrum generally matches predictions for orbital evolution dr…
View article: The NANOGrav 15 yr Data Set: Running of the Spectral Index
The NANOGrav 15 yr Data Set: Running of the Spectral Index Open
The NANOGrav 15-year data provides compelling evidence for a stochastic gravitational-wave (GW) background at nanohertz frequencies. The simplest model-independent approach to characterizing the frequency spectrum of this signal consists i…
View article: Erratum: “The NANOGrav 15 yr Data Set: Search for Signals from New Physics” (2023, ApJL 951 L11)
Erratum: “The NANOGrav 15 yr Data Set: Search for Signals from New Physics” (2023, ApJL 951 L11) Open
Erratum: "The NANOGrav 15 yr Data Set: Search for Signals from New Physics" (2023, ApJL 951 L11), Adeela Afzal, Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald, Zaven Arzoumanian, Paul T. Baker, Bence Bécsy, Jose Juan Blanco-Pillad…
View article: The NANOGrav 15 yr data set: Posterior predictive checks for gravitational-wave detection with pulsar timing arrays
The NANOGrav 15 yr data set: Posterior predictive checks for gravitational-wave detection with pulsar timing arrays Open
Pulsar-timing-array experiments have reported evidence for a stochastic background of nanohertz gravitational waves consistent with the signal expected from a population of supermassive--black-hole binaries. Their analyses assume power-law…
View article: The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the Gravitational-wave Background
The NANOGrav 15 yr Data Set: Looking for Signs of Discreteness in the Gravitational-wave Background Open
The cosmic merger history of supermassive black hole binaries (SMBHBs) is expected to produce a low-frequency gravitational wave background (GWB). Here we investigate how signs of the discrete nature of this GWB can manifest in pulsar timi…
View article: Implications of GWTC-3 on primordial black holes from vacuum bubbles
Implications of GWTC-3 on primordial black holes from vacuum bubbles Open
The population of black holes inferred from the detection of gravitational waves by the LIGO-Virgo-KAGRA Collaboration has revealed interesting features in the properties of black holes in the Universe. We analyze the GWTC-3 dataset assumi…
View article: The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background
The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background Open
The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source such low-frequency gravitational waves, here we analyze the signal as coming from …
View article: The NANOGrav 15 yr Data Set: Search for Signals from New Physics
The NANOGrav 15 yr Data Set: Search for Signals from New Physics Open
The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) shows positive evidence for the presence of a low-frequency gravitational-wave (GW) background. In this paper, we inv…
View article: Searching for gravitational wave burst in PTA data with piecewise linear functions
Searching for gravitational wave burst in PTA data with piecewise linear functions Open
Transient gravitational waves (aka gravitational wave bursts) within the nanohertz frequency band could be generated by a variety of astrophysical phenomena such as the encounter of supermassive black holes, the kinks or cusps in cosmic st…
View article: The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background
The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background Open
We report multiple lines of evidence for a stochastic signal that is correlated among 67 pulsars from the 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves. The correlations follow t…
View article: The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background
The NANOGrav 15-year Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational Wave Background Open
The NANOGrav 15-year data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source such low-frequency gravitational waves, here we analyze the signal as coming fro…
View article: Implications of GWTC-3 on primordial black holes from vacuum bubbles
Implications of GWTC-3 on primordial black holes from vacuum bubbles Open
The population of black holes inferred from the detection of gravitational waves by the LIGO-Virgo-KAGRA Collaboration has revealed interesting features in the properties of black holes in the Universe. We analyze the GWTC-3 dataset assumi…
View article: Simulating cosmic string loop captured by a rotating black hole
Simulating cosmic string loop captured by a rotating black hole Open
We study the dynamics of a cosmic string loop captured by a rotating black hole, ignoring string reconnections. A loop is numerically evolved in Kerr spacetime, with the result that it turns into one or more growing or contracting double-l…
View article: Gravitational wave background from mergers of large primordial black holes
Gravitational wave background from mergers of large primordial black holes Open
The Peters formula, which tells how the coalescence time of a binary system emitting gravitational radiation is determined by the initial size and shape of the elliptic orbit, is often used in estimating the merger rate of primordial black…
View article: Gravitational wave background from mergers of large primordial black\n holes
Gravitational wave background from mergers of large primordial black\n holes Open
The Peters formula, which tells how the coalescence time of a binary system\nemitting gravitational radiation is determined by the initial size and shape of\nthe elliptic orbit, is often used in estimating the merger rate of primordial\nbl…
View article: $\mu$-distortion around stupendously large primordial black holes
$\mu$-distortion around stupendously large primordial black holes Open
In a variety of mechanisms generating primordial black holes, each black hole is expected to form along with a surrounding underdense region that roughly compensates the black hole mass. This region will propagate outwards and expand as a …
View article: A possible mass distribution of primordial black holes implied by LIGO-Virgo
A possible mass distribution of primordial black holes implied by LIGO-Virgo Open
The LIGO-Virgo Collaboration has so far detected around 90 black holes, some of which have masses larger than what were expected from the collapse of stars. The mass distribution of LIGO-Virgo black holes appears to have a peak at ∼ 30 M ☉…
View article: Primordial black hole formation by vacuum bubbles. Part II
Primordial black hole formation by vacuum bubbles. Part II Open
The discoveries of LIGO/Virgo black holes in recent years have revitalized the study of primordial black holes. In this work we investigate a mechanism where primordial black holes are formed by vacuum bubbles that randomly nucleate during…
View article: CMB spectral distortions from black holes formed by vacuum bubbles
CMB spectral distortions from black holes formed by vacuum bubbles Open
Vacuum bubbles may nucleate and expand during the cosmic inflation. When\ninflation ends, the bubbles run into the ambient plasma, producing strong\nshocks followed by underdensity waves, which propagate outwards. The bubbles\nthemselves e…