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A simple model of quintessential inflation with the modified exponential potential exp(-alpha phi) [A + (phi-phi_0)^2] is analyzed in the braneworld context. Considering reheating via instant preheating, it is shown that the evolution of the scalar field phi from inflation to the present epoch is consistent with the observational constraints in a wide region of the parameter space. The model exhibits transient acceleration at late times for 0.96 < A alpha^2 < 1.26 and 271 < phi_0 alpha < 273, while permanent acceleration is obtained for 2.3 10^{-8} < A alpha^2 < 0.98 and 255 < phi_0 alpha < 273. The steep parameter alpha is constrained to be in the range 5.3 < alpha < 10.8.
We explore the possibility of baryogenesis in the framework of quintessential inflation. We focus on the model independent features of the underlying paradigm and demonstrate that the required baryon asymmetry can successfully be generated in this sc
We illustrate a framework for constructing models of chaotic inflation where the inflaton is the position of a D3 brane along the universal cover of a string compactification. In our scenario, a brane rolls many times around a non-trivial one-cycle,
We show that brane inflation is very sensitive to tiny sharp features in extra dimensions, including those in the potential and in the warp factor. This can show up as observational signatures in the power spectrum and/or non-Gaussianities of the cos
We discuss supergravity inflation in braneworld cosmology for the class of potentials $V(phi)=alpha phi^nrm{exp}(-beta^m phi^m)$ with $m=1,~2$. These minimal SUGRA models evade the $eta$ problem due to a broken shift symmetry and can easily accommoda
We investigate the primordial phase of the Universe in the context of brane inflation modeled by Bogomolnyi-Prasad-Sommerfield (BPS) domain walls solutions of a bosonic sector of a 5D supergravity inspired theory. The solutions are embedded into five