Search Publications
Constraining the stochastic gravitational wave background with photometric surveys
Doré, Olivier; Wang, Yijun; Pardo, Kris +1 more
The detection of the stochastic gravitational wave background (SGWB) is essential for understanding black hole populations, especially for supermassive black hole binaries. The recent promising results from various pulsar timing array (PTA) collaborations allude to an imminent detection. In this paper, we investigate the relative astrometric gravi…
Can high-redshift Hubble diagrams rule out the standard model of cosmology in the context of cosmography?
Pourojaghi, S.; Zabihi, N. F.; Malekjani, M.
Using mock data for the Hubble diagrams of type Ia supernovae (SNIa) and quasars (QSOs) generated based on the standard model of cosmology, and using the least-squares method based on the Markov-Chain-Monte-Carlo (MCMC) algorithm, we first put constraints on the cosmographic parameters in the context of the various model-independent cosmographic m…
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
Mendes, L.; Russano, G.; Nofrarias, M. +79 more
We present an in depth analysis of the transient events, or glitches, detected at a rate of about one per day in the differential acceleration data of LISA Pathfinder. We show that these glitches fall in two rather distinct categories: fast transients in the interferometric motion readout on one side, and true force transient events on the other. …
511 keV line constraints on feebly interacting particles from supernovae
Calore, Francesca; Carenza, Pierluca; Giannotti, Maurizio +4 more
Feebly interacting particles with masses with O (10 - 100 ) MeV can be copiously produced by core-collapse supernovae (SNe). In this paper we consider the case of MeV-ish sterile neutrinos and dark photons mixed with ordinary neutrinos and photons, respectively. Furthermore, both sterile neutrinos and dark photons may decay into positrons on their…
Sensor noise in LISA Pathfinder: An extensive in-flight review of the angular and longitudinal interferometric measurement system
Mendes, L.; Russano, G.; Sanjuan, J. +84 more
In a previous article [1], we have reported on the first subpicometer interferometer flown in space as part of ESA's LISA Pathfinder mission, and have shown the residual sensor noise to be on the level of 32.0-1.7+2.4 fm /√{Hz } . This review provides a deeper and more complete overview of the full system and its interferomet…
Modeling intrinsic galaxy alignment in the MICE simulation
Carretero, Jorge; Castander, Francisco J.; DES Collaboration +9 more
The intrinsic alignment (IA) of galaxies is potentially a major limitation in deriving cosmological constraints from weak lensing surveys. In order to investigate this effect, we assign intrinsic shapes and orientations to galaxies in the light-cone output of the MICE simulation, spanning ∼5000 deg2 and reaching redshift z =1.4 . This a…
Future constraints on primordial black holes from XGIS-THESEUS
Ghosh, Diptimoy; Sachdeva, Divya; Singh, Praniti
Current observations allow primordial black holes (PBHs) in asteroid mass range 1017- 1022 g to constitute the entire dark matter energy density (barring a small mass range constrained by 21-cm observations). In this work, we explore the possibility of probing PBHs with masses 1017- 1019 g via the upcomi…
Primordial black hole dark matter in the context of extra dimensions
Vincent, Aaron C.; Song, Ningqiang; Friedlander, Avi +2 more
Theories of large extra dimensions (LEDs) such as the Arkani-Hamed, Dimopoulos and Dvali scenario predict a "true" Planck scale M⋆ near the TeV scale, while the observed Mp l is due to the geometric effect of compact extra dimensions. These theories allow for the creation of primordial black holes (PBHs) in the early Universe…
Shining ALP dark radiation
Jaeckel, Joerg; Yin, Wen
String scenarios typically not only predict axionlike particles (ALPs) but also significant amounts of ALP dark radiation originating from the decay of the inflaton or a more general modulus. In this paper, we study the decay of such nonthermally produced relativistic (but massive) ALPs to photons. If the ALPs are sufficiently highly energetic, co…
Sensitivity of future gamma-ray telescopes to primordial black holes
Linden, Tim; Hooper, Dan; Keith, Celeste +1 more
The strongest existing constraints on primordial black holes with masses in the range of mBH∼1015- 1017 g have been derived from measurements of the local cosmic-ray electron-positron flux by Voyager 1, and MeV-scale gamma-ray observations of the inner Galaxy by COMPTEL and INTEGRAL. In this paper, we evaluate the …