How We Got to QCD Matter from the Hadron Side: 1984

Hagedorn, Rolf

doi:10.1007/978-3-319-17545-4_25

Cited by 19 publications

(29 citation statements)

References 107 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We find a smooth transformation, a position clearly taken by Hagedorn as of the early 1980s, see for example Ref. [10]. We can say that hadrons dissolve into their constituents, quarks, and that this phase transformation has been established near T H = 145 + −7 MeV [11,12].…”

Section: Hot Hagedorn Universesupporting

confidence: 66%

The hot Hagedorn Universe. Presented at the ICFNP2015 meeting, August 2015

Rafelski

Birrell

2016

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. In the context of the half-centenary of Hagedorn temperature and the statistical bootstrap model (SBM) we present a short account of how these insights coincided with the establishment of the hot big-bang model (BBM) and helped resolve some of the early philosophical difficulties. We then turn attention to the present day context and show the dominance of strong interaction quark and gluon degrees of freedom in the early stage, helping to characterize the properties of the hot Universe. We focus attention on the current experimental insights about cosmic microwave background (CMB) temperature fluctuation, and develop a much improved understanding of the neutrino freeze-out, in this way paving the path to the opening of a direct connection of quark-gluon plasma (QGP) physics in the early Universe with the QCD-lattice, and the study of the properties of QGP formed in the laboratory. The big-bang model establishedWho today can remember that before 1965 the big-bang model (BBM) was challenged by those who had difficulty accepting that there is a beginning of time? And, even after the discovery of the cosmic microwave background (CMB) radiation, announced May 1965, the idea that the primordial Universe had to be hot generated an additional challenge: how could all the energy in the Universe come from an initial space-time singularity? Such conceptual difficulties were exploited by those who did not like the hot BBM model. One of us can remember the scientific disputes.A literature search shows that Hagedorn's statistical bootstrap model (SBM) was an inadvertent solution to many conceptual difficulties. In fact, a who's who of cosmology of this period cites Hagedorn's work [1]. While it could sound presumptuous to claim that Hagedorn was the one who turned the corner in establishing the hot BBM as the standard cosmological model, at the least his contribution was very important.The Hagedorn SBM had a built-in feature that was needed, a divergence in the energy content even for a initial singular point volume. The way this works is rather easy to explain. It is convenient to introduce the hadron mass spectrum ρ(m), where ρ(m)dm = number of hadron states in {m, m+dm} .In Hagedorn's SBM, an exponentially growing mass spectrum ρ(m) ∝ m −a exp(m/T H ), is a natural solution. Thus we have within the partition function of a hadron gas comprising many different

show abstract

Section: Hot Hagedorn Universesupporting

confidence: 66%

The hot Hagedorn Universe. Presented at the ICFNP2015 meeting, August 2015

Rafelski

Birrell

2016

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

“…and, substituting it into Equations (26) and (27), one can calculate the beta function in the one loop approximation. By considering the asymptotic limit (q − 1)µ λ 0 /ε i , one obtains…”

Section: Effective Coupling and β-Functionmentioning

confidence: 99%

Fractal Structures of Yang–Mills Fields and Non-Extensive Statistics: Applications to High Energy Physics

Deppman

Megías

Menezes

2020

Physics

View full text Add to dashboard Cite

In this work, we provide an overview of the recent investigations on the non-extensive Tsallis statistics and its applications to high energy physics and astrophysics, including physics at the Large Hadron Collider (LHC), hadron physics, and neutron stars. We review some recent investigations on the power-law distributions arising in high energy physics experiments focusing on a thermodynamic description of the system formed, which could explain the power-law behavior. The possible connections with a fractal structure of hadrons is also discussed. The main objective of the present work is to delineate the state-of-the-art of those studies and show some open issues that deserve more careful investigation. We propose several possibilities to test the theory through analyses of experimental data.

show abstract

“…The Hadron Resonance Gas (HRG) model describes the confined phase of the QCD equation of state (EoS) at finite temperature below ∼ 150 MeV as a multicomponent gas of non-interacting massive stable and point-like particles [1,2], which are usually taken as the conventional hadrons listed in the review by the Particle Data Group (PDG) [3]. One of the greatest achievements of this approach has been the study of the trace anomaly, ( − 3P )/T 4 with energy density and P the pressure.…”

Section: Introductionmentioning

confidence: 99%

Quark-diquark string tension, excited baryonic resonances and thermal fluctuations

Megías¹,

Arriola²,

Salcedo³

2020

Phys. Scr.

View full text Add to dashboard Cite

We study the baryonic fluctuations from second to eighth order involving electric charge, baryon number and strangeness below the quark-gluon plasma crossover and numerically known from lattice QCD calculations. By considering a particular realization of the Hadron Resonance Gas model, we provide evidence on the dominant role of quark-diquark degrees of freedom to describe excited baryonic resonances.After proving by means of suitable Polyakov loop correlators that the quark-diquark and the quark-antiquark forces coincide, Vq q (r) = Vq D (r) + const, we find that the corresponding susceptibilities can be saturated with excited baryonic states in a quarkdiquark model picture.

show abstract

How We Got to QCD Matter from the Hadron Side: 1984

Cited by 19 publications

References 107 publications

The hot Hagedorn Universe. Presented at the ICFNP2015 meeting, August 2015

The hot Hagedorn Universe. Presented at the ICFNP2015 meeting, August 2015

Fractal Structures of Yang–Mills Fields and Non-Extensive Statistics: Applications to High Energy Physics

Quark-diquark string tension, excited baryonic resonances and thermal fluctuations

Contact Info

Product

Resources

About