Expanding and contracting Bianchi type-I cosmologies in f(R, ϕ, X) theory

Kirezli P., ULU DOĞRU M., TAŞER D., Eraslan E.

Modern Physics Letters A, cilt.41, sa.11, 2026 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 41 Sayı: 11
  • Basım Tarihi: 2026
  • Doi Numarası: 10.1142/s0217732326500550
  • Dergi Adı: Modern Physics Letters A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, INSPEC, MathSciNet, zbMATH
  • Anahtar Kelimeler: Bianchi type-I, f(R, ϕ, X), perfect fluid
  • Çanakkale Onsekiz Mart Üniversitesi Adresli: Evet

Özet

f(R; ϕ; X) theory, a combination of scalar-tensor and f(R)-class gravity, is examined for perfect fluids in Bianchi Type-I spacetime. A hybrid model of Starobinsky-like and k-essence is used. Two different forms of solutions are obtained and discussed in Bianchi Type-I cosmology. Effective energy densities, effective pressures and necessary statements of energy conditions for both solutions are analyzed. It is discussed whether f(R; ϕ; X) theory allows expanding or contracting cosmologies for the obtained two forms of Bianchi Type-I spacetime.