---
title: "New Solutions for Evolution of the Scale Factor with a Variable Cosmological Term • CBPF Index"
description: "CBPF INDEX is the system that tracks the scientific and technological output of CBPF. It lists the articles, books, technical reports and other publications of the whole CBPF community."
canonical_url: "https://index.cbpf.br/en/publicacoes/6ad2a767639f62b11adbb3c0"
locale: en
meta:
  "og:description": "CBPF INDEX is the system that tracks the scientific and technological output of CBPF. It lists the articles, books, technical reports and other publications of the whole CBPF community."
  "og:image": "https://index.cbpf.br/_og/d/c_Item%2Ctitulo_New%2BSolutions%2Bfor%2BEvolution%2Bof%2Bthe%2BScale%2BFactor%2Bwith%2Ba%2BVariable%2BCosmological%2BTerm%2Ctipo_Physics%2BNote%2Ccor_~I2E4MmMwMA%2Cautores_~Q2FybG9zIFBpbmhlaXJvOyBGLkMuIEtoYW5uYQ%2Cdetalhe_2000%2Csecao_Publications%2Cp_Ii9lbi9wdWJsaWNhY29lcy82YWQyYTc2NzYzOWY2MmIxMWFkYmIzYzAi%2Cs_fv-eB3Kb2pOUWm3V.png"
  "og:image:height": "600"
  "og:image:type": image/png
  "og:image:width": "1200"
  "og:title": "New Solutions for Evolution of the Scale Factor with a Variable Cosmological Term • CBPF Index"
  "twitter:image": "https://index.cbpf.br/_og/d/c_Item%2Ctitulo_New%2BSolutions%2Bfor%2BEvolution%2Bof%2Bthe%2BScale%2BFactor%2Bwith%2Ba%2BVariable%2BCosmological%2BTerm%2Ctipo_Physics%2BNote%2Ccor_~I2E4MmMwMA%2Cautores_~Q2FybG9zIFBpbmhlaXJvOyBGLkMuIEtoYW5uYQ%2Cdetalhe_2000%2Csecao_Publications%2Cp_Ii9lbi9wdWJsaWNhY29lcy82YWQyYTc2NzYzOWY2MmIxMWFkYmIzYzAi%2Cs_fv-eB3Kb2pOUWm3V.png"
---

> Index of every page on this site: [llms.txt](https://index.cbpf.br/llms.txt)

**Physics Note****Published**

# **New Solutions for Evolution of the Scale Factor with a Variable Cosmological Term**

**Carlos Pinheiro; F.C. Khanna**

2000

[**Download PDF **0.1 MB](https://index.cbpf.br/files/publicacao/6ad2a767639f62b11adbb3c0/pdf) [**Contact owner**](mailto:apub@cbpf.br?subject=New%20Solutions%20for%20Evolution%20of%20the%20Scale%20Factor%20with%20a%20Variable%20Cosmological%20Term)

## **Publication details**

<dl>

<dt>Authors</dt>
<dd>Carlos Pinheiro; F.C. Khanna</dd>

<dt>Type</dt>
<dd>Physics Note</dd>

<dt>Status</dt>
<dd>Published</dd>

<dt>Publication date</dt>
<dd>2000</dd>

<dt>Description</dt>
<dd>The cosmological term is assumed to be a function of time such as &lt;math&gt;\Lambda =Ba^{-2}&lt;/math&gt; where &lt;math&gt;a(t)&lt;/math&gt; means the scale factor of standard cosmology. Analytical solutions for radiation dominated epoch and open universe are found. For closed universe, &lt;math&gt;k=+1&lt;/math&gt;, and for flat universe, &lt;math&gt;k=0&lt;/math&gt;, we show a numerical solution. In general the scenario of Big Bang is preserved in our case for the Friedmann-Robertson-Walker cosmology.</dd>

<dt>Year</dt>
<dd>2000</dd>

<dt>Number</dt>
<dd>CBPF-NF-046/00</dd>

<dt>Linked to a thesis</dt>
<dd>No</dd>

<dt>Linked to a grant</dt>
<dd>No</dd>

</dl>

```json
{"@context":"https://schema.org","@graph":[{"@id":"https://index.cbpf.br/en#website","@type":"WebSite","description":"O CBPF INDEX é o sistema de acompanhamento da produção científica e tecnológica do CBPF. Nele é possível obter a lista de publicações de artigos, livros, relatórios técnicos, etc de toda a comunidade do CBPF.","inLanguage":"en-US","name":"CBPF Index","url":"https://index.cbpf.br/en","publisher":{"@id":"https://index.cbpf.br/#identity"},"translationOfWork":{"@id":"https://index.cbpf.br/#website"}},{"@id":"https://index.cbpf.br/en/publicacoes/6ad2a767639f62b11adbb3c0#webpage","@type":"WebPage","description":"CBPF INDEX is the system that tracks the scientific and technological output of CBPF. It lists the articles, books, technical reports and other publications of the whole CBPF community.","name":"New Solutions for Evolution of the Scale Factor with a Variable Cosmological Term","url":"https://index.cbpf.br/en/publicacoes/6ad2a767639f62b11adbb3c0","isPartOf":{"@id":"https://index.cbpf.br/en#website"},"potentialAction":[{"@type":"ReadAction","target":["https://index.cbpf.br/en/publicacoes/6ad2a767639f62b11adbb3c0"]}],"primaryImageOfPage":{"@id":"https://index.cbpf.br/#logo"}},{"@id":"https://index.cbpf.br/#identity","@type":"Organization","alternateName":"CBPF","description":"Unidade de pesquisa do Ministério da Ciência, Tecnologia e Inovação dedicada à pesquisa básica em Física, suas aplicações e à formação científica.","email":"web@cbpf.br","legalName":"Centro Brasileiro de Pesquisas Físicas/CBPF","name":"Centro Brasileiro de Pesquisas Físicas","taxID":"04.044.443/0001-35","telephone":"+55-21-2141-7100","url":"https://cbpf.br","address":{"@type":"PostalAddress","streetAddress":"Rua Dr. Xavier Sigaud, 150","addressLocality":"Rio de Janeiro","addressRegion":"RJ","postalCode":"22290-180","addressCountry":"BR"},"logo":{"@id":"https://index.cbpf.br/#logo"},"sameAs":["https://twitter.com/cbpf_mcti"]},{"@id":"https://index.cbpf.br/#logo","@type":"ImageObject","caption":"Centro Brasileiro de Pesquisas Físicas","contentUrl":"https://index.cbpf.br/icon-512x512-light.png","inLanguage":"en-US","url":"https://index.cbpf.br/icon-512x512-light.png"}]}
```

## Sitemap

See the full [sitemap](https://index.cbpf.br/sitemap.md) for all pages.