Constraints on Tsallis Cosmology from Big Bang Nucleosynthesis and the Relic Abundance of Cold Dark Matter Particles

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F23%3A00370377" target="_blank" >RIV/68407700:21340/23:00370377 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3390/e25111495" target="_blank" >https://doi.org/10.3390/e25111495</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/e25111495" target="_blank" >10.3390/e25111495</a>

Result language

angličtina

Original language name

Constraints on Tsallis Cosmology from Big Bang Nucleosynthesis and the Relic Abundance of Cold Dark Matter Particles

Original language description

By employing Tsallis' extensive but non-additive delta-entropy, we formulate the first two laws of thermodynamics for gravitating systems. By invoking Carath & eacute;odory's principle, we pay particular attention to the integrating factor for the heat one-form. We show that the latter factorizes into the product of thermal and entropic parts, where the entropic part cannot be reduced to a constant, as is the case in conventional thermodynamics, due to the non-additive nature of S-delta. The ensuing two laws of thermodynamics imply a Tsallis cosmology, which is then applied to a radiation-dominated universe to address the Big Bang nucleosynthesis and the relic abundance of cold dark matter particles. It is demonstrated that the Tsallis cosmology with the scaling exponent delta similar to 1.499 (or equivalently, the anomalous dimension Delta similar to 0.0013) consistently describes both the abundance of cold dark matter particles and the formation of primordial light elements, such as deuterium H-2 and helium He-4. Salient issues, including the zeroth law of thermodynamics for the delta-entropy and the lithium Li-7 problem, are also briefly discussed.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Entropy

ISSN

1099-4300

e-ISSN

1099-4300

Volume of the periodical

25

Issue of the periodical within the volume

11

Country of publishing house

CH - SWITZERLAND

Number of pages

21

Pages from-to

—

UT code for WoS article

001116462400001

EID of the result in the Scopus database

2-s2.0-85178107827