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Constraining the properties of neutron-star matter with observations / Annala, Eemeli (U. Helsinki (main)) ; Gorda, Tyler (Virginia U. (main)) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Nättilä, Joonas (Royal Inst. Tech., Stockholm ; Stockholm U. (main)) ; Vuorinen, Aleksi (U. Helsinki (main))
In this conference-proceedings contribution, we review recent advances in placing model-independent constraints on the properties of cold and dense QCD matter inside neutron stars. In addition to introducing new bounds for the Equation of State, we explain how these results may be used to make robust statements about the physical phase of strongly interacting matter in the centers of neutron stars of different masses. [...]
arXiv:1904.01354; HIP-2019-13/TH; NORDITA 2019-031.- 2019 - 6 p. - Published in : Mem. Soc. Astron. Ital.: 90 (2019) , no. 1-2, pp. 81 Fulltext: PDF; External link: Preprint
In : 12th INTEGRAL Conference and 1st AHEAD Gamma-Ray Workshop : INTEGRAL Looks AHEAD to Multi-Messenger Astrophysics, Geneva, Switzerland, 11 - 15 Feb 2019, pp.81

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Evidence for quark-matter cores in massive neutron stars / Annala, Eemeli (Helsinki U. ; Helsinki Inst. of Phys.) ; Gorda, Tyler (Virginia U.) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Nättilä, Joonas (Nordita ; Royal Inst. Tech., Stockholm) ; Vuorinen, Aleksi (Helsinki U. ; Helsinki Inst. of Phys.)
The theory governing the strong nuclear force, Quantum Chromodynamics, predicts that at sufficiently high energy densities hadronic nuclear matter undergoes a deconfinement transition to a new phase of quarks and gluons. Although this has been observed in ultrarelativistic heavy-ion collisions, it is currently an open question whether quark matter exists inside neutron stars. [...]
arXiv:1903.09121; CERN-TH-2019-031; HIP-2019-7/TH.- 2020-06-01 - 34 p. - Published in : Nature Phys. 16 (2020) 907-910 Fulltext: PDF; Fulltext from Publisher: PDF;

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NNNLO pressure of cold quark matter: leading logarithm / Gorda, Tyler (Helsinki Inst. of Phys. ; Virginia U.) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Romatschke, Paul (Colorado U.) ; Säppi, Saga (Helsinki Inst. of Phys.) ; Vuorinen, Aleksi (Helsinki Inst. of Phys.)
At high baryon chemical potential $\mu_B$, the equation of state of QCD allows a weak-coupling expansion in the QCD coupling $\alpha_s$. The result is currently known up to and including the full next-to-next-to-leading order (NNLO) $\alpha_s^2$. [...]
arXiv:1807.04120; CERN-TH-2018-230; HIP-2018-13/TH.- 2018-11-13 - 6 p. - Published in : Phys. Rev. Lett. 121 (2018) 202701 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;

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Gravitational-wave constraints on the neutron-star-matter Equation of State / Annala, Eemeli (Helsinki U. ; Helsinki Inst. of Phys.) ; Gorda, Tyler (Helsinki U. ; Helsinki Inst. of Phys.) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Vuorinen, Aleksi (Helsinki U. ; Helsinki Inst. of Phys.)
The LIGO/Virgo detection of gravitational waves originating from a neutron-star merger, GW170817, has recently provided new stringent limits on the tidal deformabilities of the stars involved in the collision. Combining this measurement with the existence of two-solar-mass stars, we generate a generic family of neutron-star-matter Equations of State (EoSs) that interpolate between state-of-the-art theoretical results at low and high baryon density. [...]
arXiv:1711.02644; CERN-TH-2017-236.- 2018-04-26 - 5 p. - Published in : Phys. Rev. Lett. 120 (2018) 172703 Fulltext: PDF; Fulltext from Publisher: PDF;

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On high-order perturbative calculations at finite density / Ghisoiu, Ioan (Helsinki Inst. of Phys. ; Helsinki U.) ; Gorda, Tyler (Helsinki Inst. of Phys. ; Colorado U. ; Helsinki U.) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Romatschke, Paul (Colorado U. ; U. Colorado, Boulder) ; Säppi, Saga (Helsinki U. ; Helsinki Inst. of Phys.) ; Vuorinen, Aleksi (Helsinki Inst. of Phys. ; Helsinki U.)
We discuss the prospects of performing high-order perturbative calculations in systems characterized by a vanishing temperature but finite density. In particular, we show that the determination of generic Feynman integrals containing fermionic chemical potentials can be reduced to the evaluation of three-dimensional phase space integrals over vacuum on-shell amplitudes - a result reminiscent of a previously proposed "naive real-time formalism" for vacuum diagrams. [...]
arXiv:1609.04339; HIP-2016-25-TH; CERN-TH-2016-207; CERN-TH-2016-207.- 2017-02 - 17 p. - Published in : Nucl. Phys. B 915 (2017) 102-118 Article from SCOAP3: PDF; Fulltext: PDF; External link: Preprint

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