Cosmological gravitational waves from isocurvature fluctuations

G Domènech - AAPPS Bulletin, 2024‏ - Springer
Gravitational waves induced by large primordial curvature fluctuations may result in a
sizable stochastic gravitational wave background. Interestingly, curvature fluctuations are …

Probing primordial black hole scenarios with terrestrial gravitational wave detectors

G Domènech, M Sasaki - Classical and Quantum Gravity, 2024‏ - iopscience.iop.org
It is possible that primordial black holes (PBHs) constitute (or constituted) a significant
fraction of the energy budget of our Universe. Terrestrial gravitational wave detectors offer …

Footprints of the QCD crossover on cosmological gravitational waves at pulsar timing arrays

G Franciolini, D Racco, F Rompineve - Physical Review Letters, 2024‏ - APS
Pulsar timing arrays (PTAs) have reported evidence for a stochastic gravitational wave (GW)
background at nanohertz frequencies, possibly originating in the early Universe. We show …

Probing the equation of state of the early Universe with pulsar timing arrays

L Liu, ZC Chen, QG Huang - Journal of Cosmology and …, 2023‏ - iopscience.iop.org
The recently released data by pulsar timing array (PTA) collaborations have amassed
substantial evidence corroborating the existence of a stochastic signal consistent with a …

Scalar induced gravitational waves in light of Pulsar Timing Array data

Z Yi, Q Gao, Y Gong, Y Wang, F Zhang - Science China Physics …, 2023‏ - Springer
The power-law parametrization for the energy density spectrum of gravitational wave (GW)
background is a useful tool to study its physics and origin. While scalar induced secondary …

Constraints on primordial curvature power spectrum with pulsar timing arrays

ZQ You, Z Yi, Y Wu - Journal of Cosmology and Astroparticle …, 2023‏ - iopscience.iop.org
The stochastic signal detected by NANOGrav, PPTA, EPTA, and CPTA can be explained by
the scalar-induced gravitational waves. In order to determine the scalar-induced …

Implications for the supermassive black hole binaries from the NANOGrav 15-year data set

YC Bi, YM Wu, ZC Chen, QG Huang - Science China Physics, Mechanics …, 2023‏ - Springer
Several pulsar timing array (PTA) collaborations, including NANOGrav, EPTA, PPTA, and
CPTA, have announced the evidence for a stochastic signal consistent with a stochastic …

Primordial black holes from supercooled phase transitions

Y Gouttenoire, T Volansky - Physical Review D, 2024‏ - APS
Cosmological first-order phase transitions (1stOPTs) are said to be strongly supercooled
when the nucleation temperature is much smaller than the critical temperature. These are …

Singling out SO (10) GUT models using recent PTA results

S Antusch, K Hinze, S Saad, J Steiner - Physical Review D, 2023‏ - APS
In this work, we construct promising model-building routes towards SO (10) grand unified
theory inflation and examine their ability to explain the recent pulsar timing arrays (PTAs) …

Simultaneously probing the sound speed and equation of state of the early Universe with pulsar timing arrays

L Liu, Y Wu, ZC Chen - Journal of Cosmology and Astroparticle …, 2024‏ - iopscience.iop.org
Recently, several major pulsar timing array (PTA) collaborations have assembled strong
evidence for the existence of a gravitational-wave background at frequencies around the …