Bayesian uncertainty quantification of perturbative QCD input to the neutron-star equation of state

Gorda, Tyler; Komoltsev, Oleg; Kurkela, Aleksi; Mazeliauskas, Aleksas

doi:10.1007/jhep06(2023)002

Cited by 14 publications

(2 citation statements)

References 78 publications

(134 reference statements)

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“…The pressure of cold and dense massless QM in beta equilibrium [54]. Shown are the NLO (blue band), NNLO (yellow), and NNNLO (green) perturbative orders, of which the last one is new and contains one single undetermined coefficient c 0 set to a value determined by a Bayesian estimation performed in [54] (see also [77]).…”

Section: Discussionmentioning

confidence: 99%

Detecting and mapping the induced seismicity of a planned EGS in Helsinki/Espoo, Finland

Vuorinen¹,

Hillers²,

Oinonen³

et al. 2023

Preprint

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<p align="justify">The company ST1 Oy planned to construct an Enhanced Geothermal System (EGS) with two boreholes drilled down to ca. 6 km depth beneath the Aalto University campus in Otaniemi, Espoo, on the border of Helsinki. The company performed two stimulations, in June&#8211;July 2018 and in May 2020, with a goal of opening up a water reservoir and achieving water circulation between the boreholes. The stimulation periods, which induced thousands of earthquakes, and their immediate surroundings were monitored by both permanent and temporary seismic networks with over 100 stations located within a few tens of kilometers of the site. Between and after the stimulations, the site was and is still being monitored by a relatively dense, consisting in total of ca. 20 stations, regional surface station and company installed borehole station networks.</p> <p align="justify">We have developed a cross-correlation based event detector which uses the existing ISUH manually analysed catalogues primarily of the 2018 and 2020 stimulation period seismicity, complemented by automatically picked catalogues from IMS, to detect events from the collected continuous waveform database. The 4-step detector &#8211; templating, detecting, event filtering & relocating &#8211; can run on varying station configuration and is able to detect events down to ML -0.5 &#8211; -1.0 with the station-event geometry around the EGS. We present here the results of the detector run from the beginning of the dense stimulation monitoring in May 2018 to the end of 2022 providing a comprehensive anatomy of the EGS induced seismicity.</p>

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Section: Discussionmentioning

confidence: 99%

Detecting and mapping the induced seismicity of a planned EGS in Helsinki/Espoo, Finland

Vuorinen¹,

Hillers²,

Oinonen³

et al. 2023

Preprint

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show abstract

“…At the same time, a growing number of recent works have explored the possibility of building very large sets of EOSs that satisfy all known theoretical and observational constraints and cover the physically allowed space of EOSs (Landry & Essick 2019;Annala et al 2020) and of related quantities, such as the sound speed (Altiparmak et al 2022;Gorda et al 2023a; or the conformal anomaly (Annala et al 2023;Brandes et al 2023;Marczenko et al 2023). These EOSs are built using either generic piecewise polytropes (see, e.g., Read et al 2009;Kurkela et al 2014;Lattimer & Steiner 2014;Tews et al 2018aTews et al , 2018bMost et al 2018;Steiner et al 2018), a parameterization of the sound speed (see, e.g., Annala et al 2020;Altiparmak et al 2022; or nonparametric Gaussian process regression (see, e.g., Landry & Essick 2019;Gorda et al 2023aGorda et al , 2023b.…”

Section: Introductionmentioning

confidence: 99%

On the Maximum Mass and Oblateness of Rotating Neutron Stars with Generic Equations of State

Musolino,

Ecker,

Rezzolla

2024

ApJ

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A considerable effort has been dedicated recently to the construction of generic equations of state (EOSs) for matter in neutron stars. The advantage of these approaches is that they can provide model-independent information on the interior structure and global properties of neutron stars. Making use of more than 106 generic EOSs, we assess the validity of quasi-universal relations of neutron-star properties for a broad range of rotation rates, from slow rotation up to the mass-shedding limit. In this way, we are able to determine with unprecedented accuracy the quasi-universal maximum-mass ratio between rotating and nonrotating stars and reveal the existence of a new relation for the surface oblateness, i.e., the ratio between the polar and equatorial proper radii. We discuss the impact that our findings have on the imminent detection of new binary neutron-star mergers and how they can be used to set new and more stringent limits on the maximum mass of nonrotating neutron stars, as well as to improve the modeling of the X-ray emission from the surface of rotating stars.

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Integrating by parts at finite density

Österman,

Schicho,

Vuorinen

2023

J. High Energ. Phys.

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Both nonzero temperature and chemical potentials break the Lorentz symmetry present in vacuum quantum field theory by singling out the rest frame of the heat bath. This leads to complications in the application of thermal perturbation theory, including the appearance of novel infrared divergences in loop integrals and an apparent absence of four-dimensional integration-by-parts (IBP) identities, vital for high-order computations. Here, we propose a new strategy that enables the use of IBP techniques in the evaluation of Feynman integrals, in particular vacuum or bubble diagrams, in the limit of vanishing temperature T but nonzero chemical potentials μ. The central elements of the new setup include a contour representation for the temporal momentum integral, the use of a small but nonzero T as an IR regulator, and the systematic application of both temporal and spatial differential operators in the generation of linear relations among the loop integrals of interest. The relations we derive contain novel inhomogeneous terms featuring differentiated Fermi-Dirac distribution functions, which severely complicate calculations at nonzero temperature, but are shown to reduce to solvable lower-dimensional objects as T tends to zero. Pedagogical example computations are kept at the one- and two-loop levels, but the application of the new method to higher-order calculations is discussed in some detail.

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Bayesian uncertainty quantification of perturbative QCD input to the neutron-star equation of state

Cited by 14 publications

References 78 publications

Detecting and mapping the induced seismicity of a planned EGS in Helsinki/Espoo, Finland

Detecting and mapping the induced seismicity of a planned EGS in Helsinki/Espoo, Finland

On the Maximum Mass and Oblateness of Rotating Neutron Stars with Generic Equations of State

Integrating by parts at finite density

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