Precision cosmology with primordial GW backgrounds in presence of astrophysical foregrounds

Abstract

The era of Gravitational-Wave (GW) astronomy will grant the detection of the astrophysical GW background from unresolved mergers of binary black holes, and the prospect of probing the presence of primordial GW backgrounds. In particular, the low-frequency tail of the GW spectrum for causally-generated primordial signals (like a phase transition) offers an excellent opportunity to measure unambiguously cosmological parameters as the equation of state of the universe, or free-streaming particles at epochs well before recombination. We discuss whether this programme is jeopardised by the uncertainties on the astrophysical GW foregrounds that coexist with a primordial background. We detail the motivated assumptions under which the astrophysical foregrounds can be assumed to be known in shape, and only uncertain in their normalisation. In this case, the sensitivity to a primordial signal can be computed by a simple and numerically agile procedure, where the optimal filter function subtracts the components of the astrophysical foreground that are close in spectral shape to the signal. We show that the degradation of the sensitivity to the signal in presence of astrophysical foregrounds is limited to a factor of a few, and only around the frequencies where the signal is closer to the foregrounds. Our results highlight the importance of modelling the contributions of eccentric or intermediate-mass black hole binaries to the GW background, to consolidate the prospects to perform precision cosmology with primordial GW backgrounds.

arXiv comment18 pages, 6 figures

References in corpus (110)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• GWTC-3: Compact Binary Coalescences Observed by LIGO and Virgo During the Second Part of the Third Observing Run
• Laser Interferometer Space Antenna
• Gravitational Wave Experiments and Early Universe Cosmology
• Science with the space-based interferometer eLISA. II: Gravitational waves from cosmological phase transitions
• Cosmological Backgrounds of Gravitational Waves
• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• Detecting a stochastic background of gravitational radiation: Signal processing strategies and sensitivities
• Black holes, gravitational waves and fundamental physics: a roadmap
• Detecting gravitational waves from cosmological phase transitions with LISA: an update
• Science with the space-based interferometer LISA. V: Extreme mass-ratio inspirals
• Second-Order Cosmological Perturbations from Inflation
• The construction and use of LISA sensitivity curves
• Semianalytic Calculation of Gravitational Wave Spectrum Nonlinearly Induced from Primordial Curvature Perturbations
• Detection methods for stochastic gravitational-wave backgrounds: a unified treatment
• Shape of the acoustic gravitational wave power spectrum from a first order phase transition
• Upper Limits on the Isotropic Gravitational-Wave Background from Advanced LIGO's and Advanced Virgo's Third Observing Run
• Science with the space-based interferometer LISA. IV: Probing inflation with gravitational waves
• Secular evolution of compact binaries near massive black holes: gravitational wave sources and other exotica
• A Cosmological Signature of the SM Higgs Instability: Gravitational Waves
• Relic gravitational waves produced after preheating
• Cosmology with the Laser Interferometer Space Antenna
• General Properties of the Gravitational Wave Spectrum from Phase Transitions
• Theory and Numerics of Gravitational Waves from Preheating after Inflation
• One Channel to Rule Them All? Constraining the Origins of Binary Black Holes using Multiple Formation Pathways
• Probing the early universe with inflationary gravitational waves
• Improved Calculation of the Primordial Gravitational Wave Spectrum in the Standard Model
• CMB polarization from secondary vector and tensor modes
• A Gravitational Wave Background from Reheating after Hybrid Inflation
• Probing the gravitational wave background from cosmic strings with LISA
• Short-period AM CVn systems as optical, X-ray and gravitational wave sources
• Gravitational Wave Production At The End Of Inflation
• Primordial gravitational waves, precisely: The role of thermodynamics in the Standard Model
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• A stochastic background of gravitational waves from hybrid preheating
• Reconstructing the spectral shape of a stochastic gravitational wave background with LISA
• Stochastic Gravitational Wave Production After Inflation
• Detectability of inflation-produced gravitational waves
• Theoretical uncertainties for cosmological first-order phase transitions
• Relating gravitational wave constraints from primordial nucleosynthesis, pulsar timing, laser interferometers, and the CMB: implications for the early universe
• Universal infrared scaling of gravitational wave background spectra
• LISA for Cosmologists: Calculating the Signal-to-Noise Ratio for Stochastic and Deterministic Sources
• Gravitational waves from first order cosmological phase transitions in the Sound Shell Model
• Induced gravitational waves in a general cosmological background
• Probing the pre-BBN universe with gravitational waves from cosmic strings
• Beyond the Standard Models with Cosmic Strings
• Induced gravitational waves as a probe of thermal history of the universe
• Phase Transitions in an Expanding Universe: Stochastic Gravitational Waves in Standard and Non-Standard Histories
• Phase transitions in the early universe
• Galactic binary science with the new LISA design
• Improved reconstruction of a stochastic gravitational wave background with LISA
• Updated predictions for gravitational waves produced in a strongly supercooled phase transition
• Characterizing the Galactic Gravitational Wave Background with LISA
• Anisotropy of the astrophysical gravitational wave background: analytic expression of the angular power spectrum and correlation with cosmological observations
• Characterization of the stochastic signal originating from compact binaries populations as measured by LISA
• The Cosmic Evolution of Binary Black Holes in Young, Globular and Nuclear Star Clusters: Rates, Masses, Spins and Mixing Fractions
• Probing the equation of state of the early universe with a space laser interferometer
• Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo's first three observing runs
• Probing Anisotropies of the Stochastic Gravitational Wave Background with LISA
• Ability of LIGO and LISA to probe the equation of state of the early Universe
• First predictions of the angular power spectrum of the astrophysical gravitational wave background
• Fingerprint of Low-Scale Leptogenesis in the Primordial Gravitational-Wave Spectrum
• Primordial Anisotropies in the Gravitational Wave Background from Cosmological Phase Transitions
• Characterizing the Cosmological Gravitational Wave Background Anisotropies and non-Gaussianity
• Wet Extreme Mass Ratio Inspirals May Be More Common For Spaceborne Gravitational Wave Detection
• Observationally driven Galactic double white dwarf population for LISA
• Building better spin models for merging binary black holes: Evidence for non-spinning and rapidly spinning nearly aligned sub-populations
• Subtracting compact binary foreground sources to reveal primordial gravitational-wave backgrounds
• Relic Gravitational Waves and Limits on Inflation
• Gravitational wave background from extreme mass ratio inspirals
• Mid-band gravitational wave detection with precision atomic sensors
• Causal gravitational waves as a probe of free streaming particles and the expansion of the Universe
• Stochastic gravitational-wave background as a tool to investigate multi-channel astrophysical and primordial black-hole mergers
• Formation channels of single and binary stellar-mass black holes
• Binary Black Hole Merger Rates in AGN Disks versus Nuclear Star Clusters: Loud beats Quiet
• Stochastic Gravitational Wave Background from Global Cosmic Strings
• Time-dependence of the astrophysical stochastic gravitational wave background
• Spectral separation of the stochastic gravitational-wave background for LISA: observing both cosmological and astrophysical backgrounds
• BSM with Cosmic Strings: Heavy, up to EeV mass, Unstable Particles
• Imprint of a scalar era on the primordial spectrum of gravitational waves
• Foreground cleaning and template-free stochastic background extraction for LISA
• StarTrack predictions of the stochastic gravitational-wave background from compact binary mergers
• Gravitational waves from first order phase transitions as a probe of an early matter domination era and its inverse problem
• Searching for cosmological gravitational-wave backgrounds with third-generation detectors in the presence of an astrophysical foreground
• Spectral separation of the stochastic gravitational-wave background for LISA in the context of a modulated Galactic foreground
• Ability of LISA to detect a gravitational-wave background of cosmological origin: the cosmic string case
• Using a Primordial Gravitational Wave Background to Illuminate New Physics
• Searching for mass-spin correlations in the population of gravitational-wave events: the GWTC-3 case study
• Subtracting Compact Binary Foregrounds to Search for Subdominant Gravitational-Wave Backgrounds in Next-Generation Ground-Based Observatories
• Extreme Gravity and Fundamental Physics
• Probing dark radiation with inflationary gravitational waves
• LISA Sensitivity to Gravitational Waves from Sound Waves
• Gravitational Waves from Double White Dwarfs as probes of the Milky Way
• Prospects for LISA to detect a gravitational-wave background from first order phase transitions
• Intensity and anisotropies of the stochastic Gravitational Wave background from merging compact binaries in galaxies
• Isolated and dynamical black hole mergers with \texttt{B-POP}: the role of star formation and dynamics, star cluster evolution, natal kicks, mass and spins, and hierarchical mergers
• Constraints on the contributions to the observed binary black hole population from individual evolutionary pathways in isolated binary evolution
• Precision Early Universe Cosmology from Stochastic Gravitational Waves
• Searching for Cross-Correlation Between Stochastic Gravitational Wave Background and Galaxy Number Counts
• Probing neutrino interactions and dark radiation with gravitational waves
• The Population of Eccentric Binary Black Holes: Implications for mHz Gravitational Wave Experiments
• Impact of LIGO-Virgo black hole binaries on gravitational wave background searches
• Fundamental physics using the temporal gravitational wave background
• Measuring the primordial gravitational wave background in the presence of other stochastic signals
• TASI Lectures on Gravitational Waves from the Early Universe
• Gravitational waves and fundamental physics

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• The Science of the Einstein Telescope
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• Ultrahigh frequency primordial gravitational waves beyond the kHz: The case of cosmic strings
• Complete analysis of the background and anisotropies of scalar-induced gravitational waves: primordial non-Gaussianity $f_{\mathrm{NL}}$ and $g_{\mathrm{NL}}$ considered
• Anisotropies in Scalar-Induced Gravitational-Wave Background from Inflaton-Curvaton Mixed Scenario with Sound Speed Resonance
• Unraveling Cosmological Anisotropies within Stochastic Gravitational Wave Backgrounds
• Scalar Co-SIMP Dark Matter: Models and Sensitivities
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• Microscopic primordial black holes as macroscopic dark matter from large extra dimensions