Glenn D. Starkman
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View article: Cosmic topology. Part IIb. Eigenmodes, correlation matrices, and detectability of non-orientable Euclidean manifolds
Cosmic topology. Part IIb. Eigenmodes, correlation matrices, and detectability of non-orientable Euclidean manifolds Open
If the Universe has non-trivial spatial topology, observables depend on both the parameters of the spatial manifold and the position and orientation of the observer. In infinite Euclidean space, most cosmological observables arise from the…
View article: Cosmic topology. Part IIIb. Eigenmodes and correlation matrices of spin-2 perturbations in orientable Euclidean manifolds
Cosmic topology. Part IIIb. Eigenmodes and correlation matrices of spin-2 perturbations in orientable Euclidean manifolds Open
We study the eigenmodes of the spin-2 Laplacian in orientable Euclidean manifolds and their implications for the tensor-induced part of the cosmic microwave background (CMB) temperature and polarization anisotropies. We provide analytic ex…
View article: To CPL, or not to CPL? What we have not learned about the dark energy equation of state
To CPL, or not to CPL? What we have not learned about the dark energy equation of state Open
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-Linder (CPL) parametrization, instead of allowing for higher…
View article: Gravitational Wave Scattering From the Sun and Planets
Gravitational Wave Scattering From the Sun and Planets Open
General relativity predicts that massless waves should scatter from the Riemann curvature of their backgrounds. These scattered waves are sometimes called $\textit{tails}$ and have never been directly observed. Here we calculate the gravit…
View article: Cosmological constraints on anisotropic Thurston geometries
Cosmological constraints on anisotropic Thurston geometries Open
Much of modern cosmology relies on the Cosmological Principle, the assumption that the Universe is isotropic and homogeneous on sufficiently large scales, but it remains worthwhile to examine cosmological models that violate this principle…
View article: Cosmic topology. Part Ic. Limits on lens spaces from circle searches
Cosmic topology. Part Ic. Limits on lens spaces from circle searches Open
Cosmic microwave background (CMB) temperature and polarization observations indicate that in the best-fit Λ Cold Dark Matter model of the Universe, the local geometry is consistent with at most a small amount of positive or negative curvat…
View article: Cosmic topology. Part IIIa. Microwave background parity violation without parity-violating microphysics
Cosmic topology. Part IIIa. Microwave background parity violation without parity-violating microphysics Open
The standard cosmological model, which assumes statistical isotropy and parity invariance, predicts the absence of correlations between even-parity and odd-parity observables of the cosmic microwave background (CMB). Contrary to these pred…
View article: Cosmological constraints on anisotropic Thurston geometries
Cosmological constraints on anisotropic Thurston geometries Open
Much of modern cosmology relies on the Cosmological Principle, the assumption that the Universe is isotropic and homogeneous on sufficiently large scales, but it remains worthwhile to examine cosmological models that violate this principle…
View article: Cosmic topology. Part Ic. Limits on lens spaces from circle searches
Cosmic topology. Part Ic. Limits on lens spaces from circle searches Open
Cosmic microwave background (CMB) temperature and polarization observations indicate that in the best-fit $Λ$ Cold Dark Matter model of the Universe, the local geometry is consistent with at most a small amount of positive or negative curv…
View article: Cosmic topology. Part IVa. Classification of manifolds using machine learning: a case study with small toroidal universes
Cosmic topology. Part IVa. Classification of manifolds using machine learning: a case study with small toroidal universes Open
Non-trivial spatial topology of the Universe may give rise to potentially measurable signatures in the cosmic microwave background. We explore different machine learning approaches to classify harmonic-space realizations of the microwave b…
View article: Extremal Kerr black hole dark matter from Hawking evaporation
Extremal Kerr black hole dark matter from Hawking evaporation Open
International audience
View article: Promise of Future Searches for Cosmic Topology
Promise of Future Searches for Cosmic Topology Open
The shortest distance around the Universe through us is unlikely to be much larger than the horizon diameter if microwave background anomalies are due to cosmic topology. We show that observational constraints from the lack of matched temp…
View article: Erratum: Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches
Erratum: Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches Open
Erratum: Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches, Deyan P. Mihaylov, Yashar Akrami, Craig J. Copi, Andrew H. Jaffe, Arthur Kosowsky, Pip Petersen, Glenn D. Starkman, Andrius Tamosiunas, Johann…
View article: Angular correlations of cosmic microwave background spectrum distortions from photon diffusion
Angular correlations of cosmic microwave background spectrum distortions from photon diffusion Open
During cosmic recombination, charged particles bind into neutral atoms and the mean free path of photons rapidly increases, resulting in the familiar diffusion damping of primordial radiation temperature variations. An additional effect is…
View article: Extremal Kerr Black Hole Dark Matter from Hawking Evaporation
Extremal Kerr Black Hole Dark Matter from Hawking Evaporation Open
The Hawking process results in a monotonic decrease of the black hole mass, but a biased random walk of the black hole angular momentum. We demonstrate that this stochastic process leads to a significant fraction of primordial black holes …
View article: Cosmic topology. Part IIa. Eigenmodes, correlation matrices, and detectability of orientable Euclidean manifolds
Cosmic topology. Part IIa. Eigenmodes, correlation matrices, and detectability of orientable Euclidean manifolds Open
If the Universe has non-trivial spatial topology, observables depend on both the parameters of the spatial manifold and the position and orientation of the observer. In infinite Euclidean space, most cosmological observables arise from the…
View article: The Universe is not statistically isotropic
The Universe is not statistically isotropic Open
The standard cosmological model predicts statistically isotropic cosmic microwave background (CMB) fluctuations. However, several summary statistics of CMB isotropy have anomalous values, including: the low level of large-angle temperature…
View article: Angular Correlations of Cosmic Microwave Background Spectrum Distortions from Photon Diffusion
Angular Correlations of Cosmic Microwave Background Spectrum Distortions from Photon Diffusion Open
During cosmic recombination, charged particles bind into neutral atoms and the mean free path of photons rapidly increases, resulting in the familiar diffusion damping of primordial radiation temperature variations. An additional effect is…
View article: Status of the DIMS project for macroscopic dark matter search using ultra-high sensitivity CMOS cameras at the Telescope Array UHECR observatory
Status of the DIMS project for macroscopic dark matter search using ultra-high sensitivity CMOS cameras at the Telescope Array UHECR observatory Open
The nature of dark matter has been the subject of ongoing investigation in fields such as particle physics, cosmology, and astrophysics. One hypothetical form of dark matter is nuggets of strange quark matter, also known as nuclearites. Th…
View article: Cosmic topology. Part IIa. Eigenmodes, correlation matrices, and detectability of orientable Euclidean manifolds
Cosmic topology. Part IIa. Eigenmodes, correlation matrices, and detectability of orientable Euclidean manifolds Open
If the Universe has non-trivial spatial topology, observables depend on both the parameters of the spatial manifold and the position and orientation of the observer. In infinite Euclidean space, most cosmological observables arise from the…
View article: Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology
Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology Open
The linear point (LP) standard ruler was identified as the basis of a purely geometric method for exploiting the baryon acoustic oscillations (BAO). The LP exploits the BAO feature imprinted in the galaxy two-point correlation function to …
View article: What is flat ΛCDM, and may we choose it?
What is flat ΛCDM, and may we choose it? Open
The Universe is neither homogeneous nor isotropic, but it is close enough that we can reasonably approximate it as such on suitably large scales. The inflationary-Λ-Cold Dark Matter (ΛCDM) concordance cosmology builds on these assumptions …
View article: Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches
Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches Open
The Einstein field equations of general relativity constrain the local curvature at every point in spacetime, but say nothing about the global topology of the Universe. Cosmic microwave background anisotropies have proven to be the most po…
View article: Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches
Cosmic topology. Part I. Limits on orientable Euclidean manifolds from circle searches Open
The Einstein field equations of general relativity constrain the local curvature at every point in spacetime, but say nothing about the global topology of the Universe. Cosmic microwave background anisotropies have proven to be the most po…
View article: Promise of Future Searches for Cosmic Topology
Promise of Future Searches for Cosmic Topology Open
The shortest distance around the Universe through us is unlikely to be much larger than the horizon diameter if microwave background anomalies are due to cosmic topology. We show that observational constraints from the lack of matched temp…
View article: What is flat ΛCDM, and may we choose it?
What is flat ΛCDM, and may we choose it? Open
The Universe is neither homogeneous nor isotropic, but it is close enough that we can reasonably approximate it as such on suitably large scales. The inflationary-$Λ$-Cold Dark Matter ($Λ$CDM) concordance cosmology builds on these assumpti…
View article: Gravitational Glint: Detectable Gravitational Wave Tails from Stars and Compact Objects
Gravitational Glint: Detectable Gravitational Wave Tails from Stars and Compact Objects Open
Observations of a merging neutron star binary in both gravitational waves, by the Laser Interferometer Gravitational-wave Observatory (LIGO), and across the spectrum of electromagnetic radiation, by myriad telescopes, have been used to sho…
View article: Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology
Cosmological forecasts for future galaxy surveys with the linear point standard ruler: Toward consistent BAO analyses far from a fiducial cosmology Open
The linear point (LP) standard ruler was identified as the basis of a purely geometric method for exploiting the Baryon Acoustic Oscillations (BAO). The LP exploits the BAO feature imprinted in the galaxy two-point correlation function to …
View article: Accurate relativistic observables from postprocessing light cone catalogs
Accurate relativistic observables from postprocessing light cone catalogs Open
We introduce and study a new scheme to construct relativistic observables\nfrom post-processing light cone data. This construction is based on a novel\napproach, LC-Metric, which takes general light cone or snapshot output\ngenerated by ar…
View article: A Straight Lightning Bolt?! Observation of a Predicted Macro Dark Matter Signature
A Straight Lightning Bolt?! Observation of a Predicted Macro Dark Matter Signature Open
Recently, four remarkably straight very brief flashes of light were captured on video in Perth, Australia within 0.5s of one another. Straight lightning was recently identified as a prediction of macroscopic dark matter (macros) -- a broad…