10 papers
No persuasive evidence yet of gravitational-wave tails from perturbers along the line of sight in LVK observations
Kuba Kopczuk, Ethan Blake, Matthew F. Carney +7
The authors search LIGO‑Virgo‑KAGRA data for gravitational‑wave tail signals, called "glints," using Bayesian model comparison and find no convincing evidence, setting upper limits…
The Topology of the Universe
Craig J. Copi, Deyan P. Mihaylov, Anna Negro +14
Is the Universe infinite in all directions? The only way to know is to look. A non-trivial cosmic topology would imprint subtle signatures on the cosmic microwave background (CMB)…
To CPL, or not to CPL? What we have not learned about the dark energy equation of state
Savvas Nesseris, Yashar Akrami, Glenn D. Starkman
We show that using a Taylor expansion for the dark energy equation-of-state parameter and limiting it to the zeroth and first-order terms, i.e., the so-called Chevallier-Polarski-L…
Strong Evidence Against a Statistically Isotropic Universe
Joann Jones, Craig J. Copi, Glenn D. Starkman +1
The standard cosmological model predicts statistically isotropic cosmic microwave background (CMB) fluctuations characterized by the CMB temperature coefficients being…
Quantum Signatures of Cosmic Topology: How Casimir Backreaction Transmits Isotropy Violation
Anna Negro, Kurt Hinterbichler, Glenn D. Starkman +17
A finite, scheme-independent Casimir contribution to the stress-energy tensor arises naturally for quantum fields in universes with non-trivial spatial topology. We compute this Ca…
Cosmic topology. Part IIc. Detectability with non-standard primordial power spectrum
Joline Noltmann, Andrius Tamosiunas, Deyan P. Mihaylov +13
Non-trivial spatial topology of the Universe can imprint potentially observable signatures on the cosmic microwave background (CMB). In this study, we investigate how deviations fr…