<p>We shall investigate the inflation for the D-brane model, motivated by the modified gravity <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10714_2025_3448_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\(F(\phi ,T)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>F</mi> <mo stretchy="false">(</mo> <mi>ϕ</mi> <mo>,</mo> <mi>T</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>. This gravity has been recently introduced in the literature. The feasibility of the D-brane inflation theory in the <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10714_2025_3448_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\(F(\phi ,T)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>F</mi> <mo stretchy="false">(</mo> <mi>ϕ</mi> <mo>,</mo> <mi>T</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>-gravity has been studied in conjunction with the most recent Planck data. We shall analyze the slow-roll inflation in the context of the <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10714_2025_3448_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="50" /> </InlineMediaObject> <EquationSource Format="TEX">\(F(\phi )T\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>F</mi> <mo stretchy="false">(</mo> <mi>ϕ</mi> <mo stretchy="false">)</mo> <mi>T</mi> </mrow> </math></EquationSource> </InlineEquation>-gravity, via the D-brane model. Then, we shall calculate the inflation dynamics to obtain the scalar spectral index “<InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10714_2025_3448_Article_IEq6.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(n_s\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>n</mi> <mi>s</mi> </msub> </math></EquationSource> </InlineEquation>” and the tensor-to-scalar ratio “<i>r</i>”. Besides, we investigate the dynamics of the reheating for this model. Our model accurately covers the left-hand side of the Planck data and the D-brane inflation.</p>

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Observational restrictions and slow-roll D-brane inflation in the special \(F(\phi ,T)\) gravity

  • Feyzollah Younesizadeh,
  • Davoud Kamani

摘要

We shall investigate the inflation for the D-brane model, motivated by the modified gravity \(F(\phi ,T)\) F ( ϕ , T ) . This gravity has been recently introduced in the literature. The feasibility of the D-brane inflation theory in the \(F(\phi ,T)\) F ( ϕ , T ) -gravity has been studied in conjunction with the most recent Planck data. We shall analyze the slow-roll inflation in the context of the \(F(\phi )T\) F ( ϕ ) T -gravity, via the D-brane model. Then, we shall calculate the inflation dynamics to obtain the scalar spectral index “ \(n_s\) n s ” and the tensor-to-scalar ratio “r”. Besides, we investigate the dynamics of the reheating for this model. Our model accurately covers the left-hand side of the Planck data and the D-brane inflation.