12 research outputs found
BINGO: A code for the efficient computation of the scalar bi-spectrum
We present a new and accurate Fortran code, the BI-spectra and
Non-Gaussianity Operator (BINGO), for the efficient numerical computation of
the scalar bi-spectrum and the non-Gaussianity parameter f_{NL} in single field
inflationary models involving the canonical scalar field. The code can
calculate all the different contributions to the bi-spectrum and the parameter
f_{NL} for an arbitrary triangular configuration of the wavevectors. Focusing
firstly on the equilateral limit, we illustrate the accuracy of BINGO by
comparing the results from the code with the spectral dependence of the
bi-spectrum expected in power law inflation. Then, considering an arbitrary
triangular configuration, we contrast the numerical results with the analytical
expression available in the slow roll limit, for, say, the case of the
conventional quadratic potential. Considering a non-trivial scenario involving
deviations from slow roll, we compare the results from the code with the
analytical results that have recently been obtained in the case of the
Starobinsky model in the equilateral limit. As an immediate application, we
utilize BINGO to examine of the power of the non-Gaussianity parameter f_{NL}
to discriminate between various inflationary models that admit departures from
slow roll and lead to similar features in the scalar power spectrum. We close
with a summary and discussion on the implications of the results we obtain.Comment: v1: 5 pages, 5 figures; v2: 35 pages, 11 figures, title changed,
extensively revised; v3: 36 pages, 11 figures, to appear in JCAP. The BINGO
code is available online at
http://www.physics.iitm.ac.in/~sriram/bingo/bingo.htm
Exploring Cosmic Origins with CORE: Cosmological Parameters
We forecast the main cosmological parameter constraints achievable with theCORE space mission which is dedicated to mapping the polarisation of the CosmicMicrowave Background (CMB). CORE was recently submitted in response to ESA'sfifth call for medium-sized mission proposals (M5). Here we report the resultsfrom our pre-submission study of the impact of various instrumental options, inparticular the telescope size and sensitivity level, and review the great,transformative potential of the mission as proposed. Specifically, we assessthe impact on a broad range of fundamental parameters of our Universe as afunction of the expected CMB characteristics, with other papers in the seriesfocusing on controlling astrophysical and instrumental residual systematics. Inthis paper, we assume that only a few central CORE frequency channels areusable for our purpose, all others being devoted to the cleaning ofastrophysical contaminants. On the theoretical side, we assume LCDM as ourgeneral framework and quantify the improvement provided by CORE over thecurrent constraints from the Planck 2015 release. We also study the jointsensitivity of CORE and of future Baryon Acoustic Oscillation and Large ScaleStructure experiments like DESI and Euclid. Specific constraints on the physicsof inflation are presented in another paper of the series. In addition to thesix parameters of the base LCDM, which describe the matter content of aspatially flat universe with adiabatic and scalar primordial fluctuations frominflation, we derive the precision achievable on parameters like thosedescribing curvature, neutrino physics, extra light relics, primordial heliumabundance, dark matter annihilation, recombination physics, variation offundamental constants, dark energy, modified gravity, reionization and cosmicbirefringence. (ABRIDGED
Exploring cosmic origins with CORE: Cosmological parameters
We forecast the main cosmological parameter constraints achievable with the
CORE space mission which is dedicated to mapping the polarisation of the Cosmic Microwave
Background (CMB). CORE was recently submitted in response to ESAâs fifth call for mediumsized mission proposals (M5). Here we report the results from our pre-submission study of the
impact of various instrumental options, in particular the telescope size and sensitivity level,
and review the great, transformative potential of the mission as proposed. Specifically, we
assess the impact on a broad range of fundamental parameters of our Universe as a function
of the expected CMB characteristics, with other papers in the series focusing on controlling
astrophysical and instrumental residual systematics. In this paper, we assume that only a
few central CORE frequency channels are usable for our purpose, all others being devoted
to the cleaning of astrophysical contaminants. On the theoretical side, we assume ÎCDM as
our general framework and quantify the improvement provided by CORE over the current
constraints from the Planck 2015 release. We also study the joint sensitivity of CORE and
of future Baryon Acoustic Oscillation and Large Scale Structure experiments like DESI and
Euclid. Specific constraints on the physics of inflation are presented in another paper of the
series. In addition to the six parameters of the base ÎCDM, which describe the matter content
of a spatially flat universe with adiabatic and scalar primordial fluctuations from inflation, we
derive the precision achievable on parameters like those describing curvature, neutrino physics,
extra light relics, primordial helium abundance, dark matter annihilation, recombination
physics, variation of fundamental constants, dark energy, modified gravity, reionization and
cosmic birefringence. In addition to assessing the improvement on the precision of individual
parameters, we also forecast the post-CORE overall reduction of the allowed parameter space
with figures of merit for various models increasing by as much as ⌠107 as compared to Planck
2015, and 105 with respect to Planck 2015 + future BAO measurements
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
International audienceCosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probes give access to fundamental physics not available by any other means, helping elucidate the underlying theory that completes the Standard Model. The last decade has witnessed a revolution of exciting discoveries such as the detection of high-energy neutrinos and gravitational waves. The scope for major developments in the next decades is dramatic, as we detail in this report
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
International audienceCosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probes give access to fundamental physics not available by any other means, helping elucidate the underlying theory that completes the Standard Model. The last decade has witnessed a revolution of exciting discoveries such as the detection of high-energy neutrinos and gravitational waves. The scope for major developments in the next decades is dramatic, as we detail in this report
Report of the Topical Group on Cosmic Probes of Fundamental Physics for for Snowmass 2021
International audienceCosmic Probes of Fundamental Physics take two primary forms: Very high energy particles (cosmic rays, neutrinos, and gamma rays) and gravitational waves. Already today, these probes give access to fundamental physics not available by any other means, helping elucidate the underlying theory that completes the Standard Model. The last decade has witnessed a revolution of exciting discoveries such as the detection of high-energy neutrinos and gravitational waves. The scope for major developments in the next decades is dramatic, as we detail in this report