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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Entropy

ISSN

1099-4300

e-ISSN

1099-4300

Svazek periodika

25

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

21

Strana od-do

—

Kód UT WoS článku

001116462400001

EID výsledku v databázi Scopus

2-s2.0-85178107827