String gas cosmology

By T. Battefeld, S. Watson. 2005

285 citations recorded by the source corpus.

A critical review and summary of string gas cosmology is presented. A pedagogical derivation of the effective action starting from string theory, emphasizing the necessary approximations that must be invoked, is included. Working in the effective theory, that at late times it is not possible to stabilize the extra dimensions by a gas of massive string winding modes is demonstrated. Additional string gases are considered that contain so-called enhanced symmetry states. These string gases are very heavy initially, but drive the moduli to locations that minimize the energy and pressure of the gas. Both classical and quantum gas dynamics are considered, where in the former the validity of the theory is questionable and some fine-tuning is required, but in the latter a consistent and promising stabilization mechanism that is valid at late times is found. In addition, string gases provide a framework to explore dark matter, presenting alternatives to the cold dark matter model recently considered by Gubser and Peebles. Also quantum trapping with string gases as a method for including dynamics on the string landscape is discussed.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/fdbd24bcabadc2987091d86959a31589040acbb2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Robert Brandenberger
2. Yi-Fu Cai
3. P. Peter
4. C. Vafa
5. Jérôme Martin
6. Taotao Qiu
7. N. Yunes
8. S. Alexander

In Nuclear and High Energy Physics

1. Robert Brandenberger
2. Yi-Fu Cai
3. P. Peter
4. Jérôme Martin
5. C. Vafa
6. Taotao Qiu
7. N. Yunes
8. S. Alexander

Citations in the corpus

• The Matter Bounce Alternative to Inflationary Cosmology (2012, background): “the Ekpyrotic universe [15], “string gas cosmology” [16], the “Varying Speed of Light” proposal [17], the “Conformal Universe” [18], and the Matter Bounce scenario.”
• Chern-Simons Modified General Relativity (2009, background): “In fact, there are other models that suggest the CS correction could be enhanced, due to non-perturbative instanton corrections [5], interactions with fermions [6], large intrinsic curvatures [7] or small string couplings at late times [8,9,10,11,12,13,14,15,16,17].”
• Bouncing Cosmologies: Progress and Problems (2016, background): “The string gas cosmology mechanism of structure formation developed in [18] (see the reviews in [67]) is based on the assumption that our four-dimensional space-time begins in a quasi-static phase of thermal equilibrium.”
• Nonsingular cosmology with a scale-invariant spectrum of cosmological perturbations from Lee-Wick theory (2008, methodology): “As was done in the case of string gas cosmology [44, 45] (see [46] for a recent comprehensive review), we follow the matter perturbations up to Hubble radius crossing and then convert to metric fluctuations by making use of the perturbed Einstein constraint equation (the time-time component of the p”
• Trans-Planckian issues for inflationary cosmology (2012, background): “[61] for a recent review) is based on the realization that a gas of closed strings has a maximal temperature, the “Hagedorn temperature” [62] TH.”
• Modified Gravity and Cosmology (2011, unknown): “, [180, 116, 181]).”
• Non-Thermal Dark Matter and the Moduli Problem in String Frameworks (2008, background): “The evolution of the moduli in the presence of matter and/or radiation as in the case above, has been studied in [42–51].”
• String gas cosmology and structure formation (2006, background): “String gas cosmology (SGC) [1, 2] (see also [3] for early work, [4, 5] for recent overviews, and [6] for a critical review) is an approach to string cosmology, based on adding minimal but crucial inputs from string theory, namely new degrees of freedom - string oscillatory and winding modes - and ne”