Search Publications
Primordial black hole production during first-order phase transitions
Cai, Rong-Gen; Guo, Zong-Kuan; Liu, Jing +2 more
A novel mechanism for the primordial black hole (PBH) production is proposed as a natural and inevitable consequence of general first-order phase transitions without reference to specific underlying particle physics models. We obtain mutual predictions and constraints between primordial black holes and gravitational waves from phase transitions in…
Upper limit on the axion-photon coupling from magnetic white dwarf polarization
Safdi, Benjamin R.; Dessert, Christopher; Dunsky, David
Polarization measurements of thermal radiation from magnetic white dwarf (MWD) stars have been proposed as a probe of axion-photon mixing. The radiation leaving the surface of the MWD is unpolarized, but if low-mass axions exist then photons polarized parallel to the direction of the MWD's magnetic field may convert into axions, which induces a li…
Hunt for light primordial black hole dark matter with ultrahigh-frequency gravitational waves
Franciolini, Gabriele; Maharana, Anshuman; Muia, Francesco
Light primordial black holes may comprise a dominant fraction of the dark matter in our Universe. This paper critically assesses whether planned and future gravitational wave detectors in the ultrahigh-frequency band could constrain the fraction of dark matter composed of subsolar primordial black holes. Adopting the state-of-the-art description o…
Sensitivities on nonspinning and spinning primordial black hole dark matter with global 21-cm troughs
Laha, Ranjan; Saha, Akash Kumar
Detection of the global 21 cm signal arising from neutral hydrogen can revolutionize our understanding of the standard evolution of the Universe after recombination. In addition, it can also be an excellent probe of dark matter (DM). Among all the DM candidates, primordial black holes (PBHs) are one of the most well motivated. Hawking emission fro…
Asteroids for µ Hz gravitational-wave detection
Rajendran, Surjeet; Graham, Peter W.; Fedderke, Michael A.
A major challenge for gravitational-wave (GW) detection in the µ Hz band is engineering a test mass (TM) with sufficiently low acceleration noise. We propose a GW detection concept using asteroids located in the inner Solar System as TMs. Our main purpose is to evaluate the acceleration noise of asteroids in the µ Hz band. We show that…
Dark dimension, the swampland, and the dark matter fraction composed of primordial black holes
Anchordoqui, Luis A.; Antoniadis, Ignatios; Lüst, Dieter
Very recently, it was suggested that combining the swampland program with the smallness of the dark energy and confronting these ideas to experiment lead to the prediction of the existence of a single extra dimension (dubbed the dark dimension) with characteristic length scale in the micron range. We show that the rate of Hawking radiation slows d…
Testing gravity on cosmic scales: A case study of Jordan-Brans-Dicke theory
Joudaki, Shahab; Ferreira, Pedro G.; Lima, Nelson A. +1 more
We provide an end-to-end exploration of a distinct modified gravitational theory in Jordan-Brans-Dicke (JBD) gravity, from an analytical and numerical description of the background expansion and linear perturbations, to the nonlinear regime captured with a hybrid suite of N -body simulations, to the cosmological constraints from existing probes of…
Strong constraints on primordial black hole dark matter from 16 years of INTEGRAL/SPI observations
Calore, F.; Serpico, P. D.; Siegert, T. +2 more
We present a new analysis of the diffuse soft γ -ray emission toward the inner Galaxy as measured by the spectrometer aboard the INTEGRAL satellite (SPI) with 16 years of data taking. The analysis implements a spatial template fit of SPI data and an improved instrumental background model. We characterize the contribution of primordial black holes …
Detection and characterization of instrumental transients in LISA Pathfinder and their projection to LISA
Baghi, Quentin; Korsakova, Natalia; Slutsky, Jacob +3 more
The LISA Pathfinder (LPF) mission succeeded outstandingly in demonstrating key technological aspects of future space-borne gravitational-wave detectors, such as the Laser Interferometer Space Antenna (LISA). Specifically, LPF demonstrated with unprecedented sensitivity the measurement of the relative acceleration of two free-falling cubic test mas…
Galaxy luminosity function pipeline for cosmology and astrophysics
Muñoz, Julian B.; Sabti, Nashwan; Blas, Diego
Observations of high-redshift galaxies have provided us with a rich tool to study the physics at play during the epoch of reionization. The luminosity function (LF) of these objects is an indirect tracer of the complex processes that govern galaxy formation, including those of the first dark-matter structures. In this work, we present an extensive…