این هفته آقای شانت باغرام دربارهٔ موضوع زیر سمینار خواهند داد:
LCDM as privileged state of parameter space in generic f(R) gravity
Absract:
CONTEXT: In this work we propose a generic modified gravity action with two free parameters and derive the dynamics of universe through this action in Palatini formalism. We noted that in special case the action resembles to ΛCDM as a special case of this generic action in the parameter space.
AIM: We do cosmological comparison of this model with observed data to find the best parameters of model in flat universe.
METHOD: To constraint the free parameters of model we use the SNIa type Ia two data sets of Gold and Union Sample, CMB-shift parameter, Baryon Acoustic oscillation, gas mass fraction in cluster of galaxies and large scale structure data.
RESULT: The best parameters from observational data shows that LCDM as a special point in the parameter space is privileged by the observation.
این سمینار مانند نیمسال گذشته در ساعت ۱۵ روز سهشنبه ۱۳ اسفند ۱۳۸۷ در اتاق ۵۱۷ دانشکدهٔ فیزیک برگزار خواهد شد.