Search Publications
Primordial black holes and scalar-induced gravitational waves from the polynomial attractor model
Wang, Yue; Gong, Yungui; Wang, Zhongkai +1 more
Primordial black holes (PBHs) generated in the early Universe are considered as one of the candidates for dark matter. To produce PBHs with sufficient abundance, the primordial scalar power spectrum needs to be enhanced to the order of 0.01. Considering the third-order polynomial potential with polynomial attractors, we show that PBHs with a mass …
Constraints on the fuzzy dark matter mass window from high-redshift observables
Kovetz, Ely D.; Lazare, Hovav; Flitter, Jordan
We use a combination of high-redshift observables to extract the strongest constraints to date on the fraction of axion fuzzy dark matter (FDM) in the mass window
Probing a scale dependent gravitational slip with galaxy strong lensing systems
Mörtsell, Edvard; Guerrini, Sacha
Observations of galaxy-scale strong gravitational lensing systems enable unique tests of departures from general relativity at the kilo- to megaparsec scale. In this work, the gravitational slip parameter γPN, measuring the amplitude of a hypothetical fifth force, is constrained using 130 elliptical galaxy lens systems. We implement a l…
Detection of gravitational waves in circular particle accelerators II. Response analysis and parameter estimation using synthetic data
Brüggen, Marcus; Rao, Suvrat; Baumgarten, Julia +1 more
We simulate the response of a Storage Ring Gravitational Wave Observatory (SRGO) to astrophysical millihertz (mHz) gravitational waves (GWs), numerically obtaining its sensitivity curve and optimal choices for some controllable experiment parameters. We also generate synthetic noisy GW data and use Markov Chain Monte Carlo methods to perform param…
Tilt-to-length coupling in LISA Pathfinder: Long-term stability
Mendes, L.; Russano, G.; Sanjuan, J. +75 more
The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We show that they drifted slowly (by
Weak equivalence principle and nonrelativistic limit of general dispersion relations
Hohmann, Manuel; Pfeifer, Christian; Wagner, Fabian
We study the weak equivalence principle in the context of modified dispersion relations, a prevalent approach to quantum gravity phenomenology. We find that generic modified dispersion relations violate the weak equivalence principle. The acceleration in general depends on the mass of the test body, unless the Hamiltonian is either 2-homogeneous i…
Dark matter limits from the tip of the red giant branch of globular clusters
Hong, Haozhi; Vincent, Aaron C.
Capture and annihilation of weakly interacting massive particle (WIMP)-like dark matter in red giant stars can lead to faster-than-expected ignition of the helium core, and thus a lower tip of the red giant branch (TRGB) luminosity. We use Gaia data to place constraints on the dark matter-nucleon cross section using 22 globular clusters with measu…
Constraining the low-energy cosmic ray flux in the center molecular zone from MeV nuclear deexcitation line observations
Liu, Bing; Yang, Ruizhi
Low-energy cosmic rays (LECRs) dominate the ionization in dense regions of molecular clouds in which other ionizers such as UV or x-ray photons are effectively shielded. Thus, it was argued that the high ionization rate at the central molecular zone (CMZ) of our Galaxy is mainly caused by LECRs. However, the required LECR flux is orders of magnitu…
No evidence for gamma-ray emission from the Sagittarius dwarf spheroidal galaxy
Calore, Francesca; Eckner, Christopher; Manconi, Silvia
More than a decade ago, the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope unveiled the existence of two gigantic gamma-ray lobes known as the Fermi bubbles. While their origin is still unknown, various studies identified intricate spectral and morphological structures within the bubbles. One peculiar region, the cocoon, has recen…
Cosmological constraints from type-I radio-loud quasars
Chang, N.; Huang, L.; Tu, Z. Y. +3 more
We obtain a sample of 1192 type-I quasars with the UV-optical, radio, and x-ray waveband coverage, which combined with the data from Huang and Chang [Mon. Not. R. Astron. Soc. 515, 1358 (2022), 10.1093/mnras/stac1451] and other matching objects of SDSS-DR16 with FIRST, XMM-Newton, and Chandra Source Catalog, and a sample of 407 flat-spectrum radio…