»ã±¨±êÌâ (Title)£ºCosmic Microwave Background constraints on Non-commutative spacetime

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»ã±¨ÈË (Speaker)£ºDr. Joby Kochappan£¨Ó¡¶ÈÂíÄáÅÁ¶ûÌìÈ»¿ÆѧÖÐÐÄ£©

»ã±¨¹¦·ò (Time)£º2025Äê9ÔÂ26ÈÕ(ÖÜÎå) 10:30-11:30

»ã±¨µØÖ· (Place)£ºÐ£±¾²¿ G313

Ô¼ÇëÈË (Inviter)£ºÒüè´

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ÌáÒª (Abstract)£º

String theory suggests that spacetime may be non-commutative at length scales close to the Planck length. If this is true, then inflation possibly stretches out such scales to detectable sizes in cosmological observations. In this talk, I will discuss our current efforts to search for the signature of non-commutative spacetime in Cosmic Microwave Background (CMB) data. Using the CMB data from Planck2018, we find a factor of three improvement compared to the previous constraints from Planck2013 data. I will also talk about the existing systematics and challenges that we face in this pursuit.