28 research outputs found
Dark sectors 2016 Workshop: community report
This report, based on the Dark Sectors workshop at SLAC in April 2016,
summarizes the scientific importance of searches for dark sector dark matter
and forces at masses beneath the weak-scale, the status of this broad
international field, the important milestones motivating future exploration,
and promising experimental opportunities to reach these milestones over the
next 5-10 years
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
CMB-S4---the next-generation ground-based cosmic microwave background (CMB)
experiment---is set to significantly advance the sensitivity of CMB
measurements and enhance our understanding of the origin and evolution of the
Universe, from the highest energies at the dawn of time through the growth of
structure to the present day. Among the science cases pursued with CMB-S4, the
quest for detecting primordial gravitational waves is a central driver of the
experimental design. This work details the development of a forecasting
framework that includes a power-spectrum-based semi-analytic projection tool,
targeted explicitly towards optimizing constraints on the tensor-to-scalar
ratio, , in the presence of Galactic foregrounds and gravitational lensing
of the CMB. This framework is unique in its direct use of information from the
achieved performance of current Stage 2--3 CMB experiments to robustly forecast
the science reach of upcoming CMB-polarization endeavors. The methodology
allows for rapid iteration over experimental configurations and offers a
flexible way to optimize the design of future experiments given a desired
scientific goal. To form a closed-loop process, we couple this semi-analytic
tool with map-based validation studies, which allow for the injection of
additional complexity and verification of our forecasts with several
independent analysis methods. We document multiple rounds of forecasts for
CMB-S4 using this process and the resulting establishment of the current
reference design of the primordial gravitational-wave component of the Stage-4
experiment, optimized to achieve our science goals of detecting primordial
gravitational waves for at greater than , or, in the
absence of a detection, of reaching an upper limit of at CL.Comment: 24 pages, 8 figures, 9 tables, submitted to ApJ. arXiv admin note:
text overlap with arXiv:1907.0447
CMB-S4
We describe the stage 4 cosmic microwave background ground-based experiment CMB-S4
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
Abstract: CMB-S4âthe next-generation ground-based cosmic microwave background (CMB) experimentâis set to significantly advance the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe. Among the science cases pursued with CMB-S4, the quest for detecting primordial gravitational waves is a central driver of the experimental design. This work details the development of a forecasting framework that includes a power-spectrum-based semianalytic projection tool, targeted explicitly toward optimizing constraints on the tensor-to-scalar ratio, r, in the presence of Galactic foregrounds and gravitational lensing of the CMB. This framework is unique in its direct use of information from the achieved performance of current Stage 2â3 CMB experiments to robustly forecast the science reach of upcoming CMB-polarization endeavors. The methodology allows for rapid iteration over experimental configurations and offers a flexible way to optimize the design of future experiments, given a desired scientific goal. To form a closed-loop process, we couple this semianalytic tool with map-based validation studies, which allow for the injection of additional complexity and verification of our forecasts with several independent analysis methods. We document multiple rounds of forecasts for CMB-S4 using this process and the resulting establishment of the current reference design of the primordial gravitational-wave component of the Stage-4 experiment, optimized to achieve our science goals of detecting primordial gravitational waves for r > 0.003 at greater than 5Ï, or in the absence of a detection, of reaching an upper limit of r < 0.001 at 95% CL
Recommended from our members
Dark Sectors 2016 Workshop: Community Report
This report, based on the Dark Sectors workshop at SLAC in April 2016,
summarizes the scientific importance of searches for dark sector dark matter
and forces at masses beneath the weak-scale, the status of this broad
international field, the important milestones motivating future exploration,
and promising experimental opportunities to reach these milestones over the
next 5-10 years
Recommended from our members
The Simons Observatory: Astro2020 Decadal Project Whitepaper
The Simons Observatory (SO) is a ground-based cosmic microwave background
(CMB) experiment sited on Cerro Toco in the Atacama Desert in Chile that
promises to provide breakthrough discoveries in fundamental physics, cosmology,
and astrophysics. Supported by the Simons Foundation, the Heising-Simons
Foundation, and with contributions from collaborating institutions, SO will see
first light in 2021 and start a five year survey in 2022. SO has 287
collaborators from 12 countries and 53 institutions, including 85 students and
90 postdocs.
The SO experiment in its currently funded form ('SO-Nominal') consists of
three 0.4 m Small Aperture Telescopes (SATs) and one 6 m Large Aperture
Telescope (LAT). Optimized for minimizing systematic errors in polarization
measurements at large angular scales, the SATs will perform a deep,
degree-scale survey of 10% of the sky to search for the signature of primordial
gravitational waves. The LAT will survey 40% of the sky with arc-minute
resolution. These observations will measure (or limit) the sum of neutrino
masses, search for light relics, measure the early behavior of Dark Energy, and
refine our understanding of the intergalactic medium, clusters and the role of
feedback in galaxy formation.
With up to ten times the sensitivity and five times the angular resolution of
the Planck satellite, and roughly an order of magnitude increase in mapping
speed over currently operating ("Stage 3") experiments, SO will measure the CMB
temperature and polarization fluctuations to exquisite precision in six
frequency bands from 27 to 280 GHz. SO will rapidly advance CMB science while
informing the design of future observatories such as CMB-S4
Recommended from our members
CMB-S4 Decadal Survey APC White Paper
We provide an overview of the science case, instrument configuration and
project plan for the next-generation ground-based cosmic microwave background
experiment CMB-S4, for consideration by the 2020 Decadal Survey
Recommended from our members
CMB-S4 Science Case, Reference Design, and Project Plan
We present the science case, reference design, and project plan for the
Stage-4 ground-based cosmic microwave background experiment CMB-S4
Recommended from our members
CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
CMB-S4---the next-generation ground-based cosmic microwave background (CMB)
experiment---is set to significantly advance the sensitivity of CMB
measurements and enhance our understanding of the origin and evolution of the
Universe, from the highest energies at the dawn of time through the growth of
structure to the present day. Among the science cases pursued with CMB-S4, the
quest for detecting primordial gravitational waves is a central driver of the
experimental design. This work details the development of a forecasting
framework that includes a power-spectrum-based semi-analytic projection tool,
targeted explicitly towards optimizing constraints on the tensor-to-scalar
ratio, , in the presence of Galactic foregrounds and gravitational lensing
of the CMB. This framework is unique in its direct use of information from the
achieved performance of current Stage 2--3 CMB experiments to robustly forecast
the science reach of upcoming CMB-polarization endeavors. The methodology
allows for rapid iteration over experimental configurations and offers a
flexible way to optimize the design of future experiments given a desired
scientific goal. To form a closed-loop process, we couple this semi-analytic
tool with map-based validation studies, which allow for the injection of
additional complexity and verification of our forecasts with several
independent analysis methods. We document multiple rounds of forecasts for
CMB-S4 using this process and the resulting establishment of the current
reference design of the primordial gravitational-wave component of the Stage-4
experiment, optimized to achieve our science goals of detecting primordial
gravitational waves for r > 0.003 at greater than , or, in the
absence of a detection, of reaching an upper limit of r < 0.001 at CL