Cosmological Phase transitions from Lattice Field Theory

The Quark-Hadron Transition in the Early Universe

We use recent lattice QCD outputs to work out the expansion law of the Universe during the cosmological quark--hadron transition. To do so, a suitable technique to exploit both pressure and energy density data, with the related error bars, is introduced. We also implement suitable techniques to relate the T range where lattice outputs are available with lower and higher T's, for which we test suitable expressions. We finally compare the cosmological behavior found using lattice data with the one obtainable in the case the transition were first order, although not so far from the crossover tran…

无气泡的宇宙学一阶相变

Cosmological first-order phase transitions without bubbles

本研究通过格点模拟证明真空涨落可使畴壁失稳并形成真真空畴沟，从而在无气泡成核情况下完成宇宙学一阶相变，并以 Z2-odd singlet 模型展示其新参数空间。

Gravitational waves from cosmological first order phase transitions

First order phase transitions in the early Universe generate gravitational waves, which may be observable in future space-based gravitational wave observatiories, e.g. the European eLISA satellite constellation. The gravitational waves provide an unprecedented direct view of the Universe at the time of their creation. We study the generation of the gravitational waves during a first order phase transition using large-scale simulations of a model consisting of relativistic fluid and an order parameter field. We observe that the dominant source of gravitational waves is the sound generated by th…

SO中可能没有相变（3）双时间格点上的格点规范理论

A Possible Lack of Phase Transition in SO(3) Lattice Gauge Theory on Lattices with Two Temporal Sites

这篇论文正在撤回，因为其主要结果已经包含在论文hep-lat/9901006的第2节中。

D=4弱一级相变的晶格研究

Lattice study of Weak First Order Phase Transitions in D=4

研究了与量子场论的晶格研究有关的几种相变的性质。

Baryon number transfer could delay Quark-Hadron transition in cosmology

In the early Universe, strongly interacting matter was a quark-gluon plasma. Both lattice computations and heavy ion collision experiments however tell us that, in the absence of chemical potentials, no plasma survives at $T <\sim 150$ MeV. The cosmological Quark-Hadron transition, however, seems to have been a crossover; cosmological consequences envisaged when it was believed to be a phase transition no longer hold. In this paper we discuss whether even a crossover transition can leave an imprint that cosmological observations can seek or, viceversa, there are questions cosmology should addr…