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Taiji Program: Gravitational-Wave Sources
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We review potential low-frequency gravitational-wave sources, which are expected to be detected by Taiji, a Chinese space-based gravitational-wave detector, estimate the detection rates of these gravitational-wave sources and present the parameter estimation of massive black hole binaries.
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Cited by 56 Pith papers
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Hot news on the phase structure of the SMEFT
A full O(g^4) dimensional reduction of the dimension-six SMEFT shows that the top-Higgs operator O_tphi can trigger a first-order electroweak phase transition with zero (phi-dagger phi)^3 coupling at zero temperature.
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An Effective Sphaleron Awakens
A consistent 3D EFT computation of the Higgs phase sphaleron rate yields universal baryon preservation bounds x ≈ 0.025 (strong) and x ≈ 0.036 (weak), and shows two-loop corrections eliminate strong one-step transitio...
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Phase Transitions in Dimensional Reduction up to Three Loops
In a toy complex-scalar model, 1-loop dimension-6 matching corrections compete with 2-loop quartic corrections and dominate 3-loop thermal-mass corrections for strong phase transitions.
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Cosmic superstrings in large volume compactifications: PTAs, LISA and time-varying tension
Cosmic superstrings with a time-varying tension in large-volume string compactifications generically predict a LISA-band spectral drop and a high-frequency f^4 boost, encoding the mass and decay of the volume modulus.
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Gravitational Waves of GUT Phase Transition during Inflation
A general deformation function maps gravitational wave spectra from phase transitions during inflation into today's spectrum; for GUT-scale transitions the peak can appear near 10 Hz or mHz.
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Say Hello, Wave Goodbye: Gravitational Waves from Hyperbolic PBH-SMBH Interactions
Hyperbolic encounters between primordial black holes and the central supermassive black holes of the Milky Way, M31, and M87 produce gravitational wave bursts and popcorn backgrounds that are far below the sensitivity...
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Primordial black holes forming during kination: the trapped, the overdense, and the void
In one non-attractor inflation model, initially similar field fluctuations produce three distinct black-hole formation channels—trapped, overdense, void—with collapse thresholds determined by the full density profile,...
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Extreme mass-ratio inspirals into Newtonian Proca stars
For Newtonian Proca stars, a perturbing object on a circular orbit loses nearly the same energy in the vector ground state as in the scalar boson-star ground state (within ~20%), while the spherical excited Proca stat...
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Theoretical uncertainties in reconstructing model parameters with gravitational waves from supercooled phase transitions
In the conformal U(1)_X model, the daisy-resummed nucleation scheme shifts LISA-reconstructed gauge couplings by O(10%) relative to the NLO effective-field-theory result, an order of magnitude above the Fisher-matrix ...
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Magnetically assisted primordial scalar perturbations: Scalar-Induced Gravitational Waves
PMF-sourced scalar perturbations during a kination-like reheating can induce a gravitational-wave background that dominates over the direct PMF tensor signal and may be detectable at mHz-kHz frequencies.
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Reconstruction of Primordial Power Spectrum from Gravitational Waves of High-Redshift Black Hole Binaries
Gradient-descent inversion of redshifted BBH mass distributions recovers the PBH mass function and, via regularized Press-Schechter, a candidate O(10^{-2}) bump in the small-scale primordial power spectrum.
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One-Dimensional Simulations of the Topological Defects in a 3:1 $U(1)$ Model
In a 3:1 U(1) model, the Z3 domain wall develops a growing bias angle beta as v1/v2 is lowered, and no static wall exists below R12 ≈ 0.768.
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Identifying lensed gravitational waves with physics-informed posterior learning
Fusing a simulation-trained common-source mass posterior with waveform features raises lensed-event detection efficiency from 20.8% to 35.2% at 1% false-positive rate and lowers the SNR for 50% efficiency from 45.3 to 33.5.
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Circularly polarized gravitational waves from parity-violating scalar-tensor theory
In the "Qi-Xiu" parity-violating scalar-tensor theory, the L3 and L4 interactions leave linear gravitational-wave propagation GR-like but still generate circularly polarized scalar-induced gravitational waves.
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Hard thermal contributions to phase transition observables at NNLO
Three-loop thermal masses and two-loop quartic couplings complete the O(g^6) high-temperature EFT of U(1) and SU(N) gauge-Higgs models, with a missing contribution identified in a known three-loop master integral.
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Simulating first-order phase transition during inflation
A GUT-scale first-order phase transition embedded in Starobinsky inflation completes near the end of inflation, and lattice simulations confirm the predicted oscillatory gravitational-wave signal.
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Inferring the stochastic gravitational-wave background from eccentric stellar-mass binary black holes with spaceborne detectors
Eccentric black-hole-binary backgrounds from globular clusters and isolated evolution would look like power-law noise for TianQin/LISA/Taiji, but AGN-formed binaries produce a turnover that LISA and Taiji can distinguish.
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Extreme mass-ratio inspiral within an ultralight scalar cloud I. Scalar radiation
Scalar radiation from an EMRI in an ultralight scalar cloud is computed semi-analytically, showing dipole clouds decelerate and quadrupole clouds accelerate the inspiral, with up to about 100 rad dephasing after 18 months.
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A Multimessenger Strategy for Downselecting the Orientations of Galactic Close White Dwarf Binaries
Using EM-determined orbital phases, the fourfold degeneracy in the transverse projection of a close white dwarf binary's angular momentum from LISA data can be reduced to a twofold degeneracy.
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Likelihoods for Stochastic Gravitational Wave Background Data Analysis
Gaussian likelihood approximations used in stochastic gravitational-wave background searches can bias parameter estimates when the number of data segments is small, and for LISA and pulsar timing arrays the bias can e...
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The Dual Primordial Black Hole Formation Scenario
A single small-scale perturbation can form ultralight black holes during a break in inflation and heavier black holes after inflation, linking reheating to dark matter.
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Enhancement of primordial curvature perturbations in $R^3$-corrected Starobinsky-Higgs inflation
Adding a negative R^3 term to Starobinsky-Higgs inflation raises the CMB spectral index from about 0.94 to 0.965, making the model consistent with Planck while preserving the small-scale curvature enhancement needed f...
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Complementary Probes of Warped Extra Dimension: Colliders, Gravitational Waves and Primordial Black Holes from Phase Transitions
In Randall-Sundrum warped extra dimension models, the supercooled radion phase transition can form primordial black holes that account for all of dark matter for IR scales 10 TeV to 10^4 TeV, with correlated gravitati...
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Supercooled Phase Transitions: Why Thermal History of Hidden Sector Matters in Analysis of Pulsar Timing Array Signals
Tracking the evolving temperature ratio between hidden and visible sectors can change a supercooled hidden-sector phase transition's gravitational wave spectrum by up to four orders of magnitude, reviving it as an exp...
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Collapsing domain walls with $\mathbb{Z}_2$-violating coupling to thermalized fermions and their impact on gravitational wave detections
Thermal corrections from a Z2-violating Yukawa coupling alter domain-wall annihilation temperatures and can change predicted gravitational wave spectra by orders of magnitude.
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Probing the Merger Rates of Supermassive Black Holes and Galaxies with Gravitational Waves
A mock-data forecast shows that roughly forty LISA-detected SMBH merger events, combined with PTA background constraints, can recover galaxy and SMBH merger rates, while twelve events cannot.
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Alternative LISA-TAIJI networks: Detectability of the Parity Violation in Stochastic Gravitational Wave Background
The LISA-TAIJIm configuration, with TAIJI's constellation inclined opposite to LISA's, is about an order of magnitude more sensitive to a circularly polarized stochastic gravitational wave background at low frequencie...
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Gravitational memory and Ward identities in the local detector frame
Gravitational memory in TT gauge is encoded in large residual diffeomorphisms that equal BMS transformations, and their Ward identities yield soft graviton theorems and flat-space consistency relations.
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Estimating the gravitational wave background anisotropy: a Bayesian approach boosted by cross-correlation angular power spectrum
A new likelihood function estimates GWB anisotropy angular power spectra directly from detector data, and cross-correlation with the CMB can make the quadrupole measurable with four years of LISA data.
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A New LISA-Detectable Type Ia Supernova Progenitor in the Southern Sky: SMSS J1138-5139
SMSS J1138-5139 is an eclipsing ultra-compact binary with a 0.99 solar-mass white dwarf accreting from a 0.24 solar-mass donor, expected to merge in 5.7 million years and likely produce a Type Ia supernova.
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Post-Newtonian templates for phase evolution of spherical extreme mass ratio inspirals
A 12PN analytic phase model for quasi-spherical inclined EMRIs in Kerr spacetime is presented, and TaylorT1 is found to converge fastest among the time-domain approximants.
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Primordial Black Holes from Cosmic Domain Walls
A two-field inflationary model with time-dependent domain wall tension produces primordial black holes with a narrow, spike-like mass function, potentially explaining all dark matter or LIGO merger events.
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Scalar-induced gravitational waves from a box-shaped curvature power spectrum
Analytic SIGW spectra for a log-box curvature power spectrum: narrow-box geometric overlap factor turning IR slope k^{3}ln^{2}k into k^{2}ln^{2}k, plus broad-box product of universal edge functions.
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Probing strange quark matter objects with future space-based gravitational wave detectors DECIGO and BBO
DECIGO and BBO could detect continuous gravitational waves from strange star - strange planet systems across a broad mass, distance, and eccentricity parameter space.
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Electroweak Baryogenesis: Advances in Sphaleron Rate Calculations and Implications of Thermal Phase Transitions
Sphaleron rates can be computed gauge-invariantly in 3D thermal EFT, yielding a new baryon-washout criterion x = lambda3/g3^2 that replaces v_c/T_c > 1 for electroweak baryogenesis.
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PBH formation and Gravitational Waves as Multi-messenger Signals of First-order Phase Transitions
False-vacuum collapse during first-order phase transitions can form PBHs and emit GWs across a broad parameter range, and MeV-scale classically conformal U(1)_{B-L} symmetry breaking has the largest region where both ...
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Probing near-zone magnetic fields with extreme mass-ratio inspirals
A magnetized Schwarzschild background shifts EMRI orbital dynamics and GW waveforms, with B~10^9 G producing ~1.3 rad dephasing over one year for a 10^6 M_sun system.
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Rational Orbits and Gravitational Waves in Static Spherical Spacetimes: An Open-Source Numerical Framework
Open-source numerical package for rational orbits and gravitational waves in static spherically symmetric spacetimes, validated on Schwarzschild and applied to an IMBH-Sgr A* EMRI.
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Inflationary phase transitions in the early Universe: A Bayesian study with space-based gravitational-wave detectors
With a Taiji-like detector, inflationary phase-transition gravitational-wave backgrounds are detectable at SNR≳10, but reliable parameter reconstruction needs SNR≳33 and degrades with astrophysical foregrounds.
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Inspiral tests of general relativity and waveform geometry
The power of ppE-style GR tests comes from waveform geometry: GR parameter biases absorb most of any smooth phase deviation, and SVD finds the few orthogonal directions that remain.
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Bayesian analysis of the complex singlet model with phase transition gravitational waves
Bayesian forecasts for the Taiji detector constrain complex singlet model parameters through electroweak phase transition gravitational wave signals.
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Measuring gravitational wave spectrum from electroweak phase transition and Higgs self-couplings
Using simulated Taiji data, the authors show that a stochastic gravitational-wave signal from an electroweak phase transition in the singlet-extended Standard Model can constrain the Higgs cubic and quartic self-couplings.
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Constraints on parity and Lorentz violations from gravitational waves: a comparison between single-parameter and multi-parameter analysis
Multi-parameter and single-parameter gravitational-wave analyses yield comparable parity and Lorentz violation constraints for three models, but degeneracies weaken the multi-parameter result when two parameters modif...
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Little Red Dots from Small-Scale Primordial Black Hole Clustering
Densely clustered 30-solar-mass primordial black holes can sequentially merge into ~10^6 solar-mass seeds by redshift 6, possibly explaining JWST little red dots, with high spin from tidal torques and a two-peak gravi...
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Detecting Cosmological Phase Transitions with Taiji: Sensitivity Analysis and Parameter Estimation
A Bayesian injection-recovery study forecasts that Taiji can detect phase-transition gravitational wave backgrounds with peak energy density above about 1.4e-11 over most of its band.
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Gravitational waves from metastable cosmic strings in the delayed scaling scenario
Metastable cosmic strings with delayed scaling can explain the PTA gravitational wave background with tension up to Gmu ~ 3e-5 while evading LVK bounds, producing a plateau and an f^-1/3 tail detectable by future inte...
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Enhancement of small-scale induced gravitational waves from the soliton/oscillon domination
Soliton or oscillon domination generates detectable induced gravitational waves, with spectra that constrain the lumps' lifetime, abundance, and separation.
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Gravitational wave and dark matter from Axion-Higgs string
Lattice simulations show axion and axion-Higgs strings produce gravitational waves too weak for current pulsar timing arrays once dark matter overproduction is taken into account.
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Full-Covariance Bayesian Inference of Stochastic Gravitational Wave Backgrounds with Time-Domain Simulations for Taiji-like Missions
A full-covariance Bayesian pipeline that combines time-domain TDI simulations with a frequency-domain likelihood recovers injected stochastic gravitational-wave backgrounds for a Taiji-like mission, though its detecto...
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Chaotic imprints of dark matter in extreme mass-ratio inspirals
A toy model shows that adding a hand-made angle-dependent force to dark-matter spacetimes produces visual chaos and irregular numerical-Kludge waveforms, but the force is not a realistic dark-matter perturbation.
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Constraining Lorentz and parity violations in gravity with multiband gravitational wave observations
Future multiband GW networks could tighten Lorentz- and parity-violation energy-scale bounds by up to several orders of magnitude, with massive binaries best for low-frequency and loud binaries for high-frequency effects.
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Fixed-Time Voltage Regulation for Boost Converters via Unit-Safe Saturating Functions
A fixed-time feedback controller for boost converters uses a new class of saturating functions, observers, and adaptive gains to regulate output voltage within a bounded settling time under unknown load resistance.
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Constraining parity and Lorentz violations in gravity with future ground- and space-based gravitational wave detectors
Future gravitational wave detectors could tighten constraints on parity- and Lorentz-violating energy scales by one to three orders of magnitude, with space-based detectors winning for certain frequency dependencies.
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Gravitational waves and dark matter with Witten effect
A dark SU(2) phase transition can produce monopole dark matter, make the axion heavy via the Witten effect, and generate nanohertz gravitational waves matching PTA hints.
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Constraining the Galactic Structure using Time Domain Gravitational Wave Signal from Double White Dwarfs Detected by Space Gravitational Wave Detectors
A new time-domain method using the annual modulation of the unresolved and resolved double white dwarf gravitational wave foreground constrains the Galactic thin disk scale height and length and bulge scale radius to ...
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Gravitational wave astronomy and the expansion history of the Universe
A single-author review of how relic gravitational wave backgrounds could probe the post-inflationary expansion history, highlighting high-frequency signals and the quantum nature of the gravitons.
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