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DTSTART:20240101T000000
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DTSTART;TZID=Asia/Kolkata:20250214T070000
DTEND;TZID=Asia/Kolkata:20250216T230000
DTSTAMP:20241009T023314Z
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SUMMARY:Agneepath - Ashoka Annual Sports Fest
DESCRIPTION:
URL:https://www.ashoka.edu.in/event/agneepath-ashoka-annual-sports-fest/
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DTSTART;TZID=Asia/Kolkata:20250214T133000
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DTSTAMP:20250204T064653Z
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LAST-MODIFIED:20250204T064653Z
UID:72917-1739539800-1739545200@www.ashoka.edu.in
SUMMARY:Physics Seminar
DESCRIPTION:Abstract: One of the key predictions of the standard inflationary paradigm is the quantum mechanical generation of tensor fluctuations due to the rapid accelerated expansion of space\, which later constitute a stochastic background of primordial Gravitational Waves (GWs). The amplitude of the (nearly) scale-invariant inflationary tensor power spectrum at large cosmological scales provides us with crucial information about the energy scale of inflation. Furthermore\, the spectral energy density of the GWs at sufficiently small scales (or\, large frequencies) serves as an important observational probe of the post-inflationary primordial dynamics. In fact\, the small-scale spectral tilt of the GWs is sensitive to the (unknown) post-inflationary equation of state (EoS) of the universe: with a softer (than radiation) EoS resulting in red-tilted GWs\, while a stiffer EoS resulting in blue-tilted GWs. The post-inflationary dynamics of the Universe\, however\, is generically expected to be quite complex\, potentially involving a number of distinct cosmic epochs. In this talk\, the speaker will discuss the possibility of multiple sharp transitions in the EoS of the post-inflationary universe and compute the corresponding spectral energy density of the inflationary GWs. The region of the parameter space which leads to a potentially detectable signal in the upcoming GW detectors\, without violating the current constraints\, will be explicitly presented.     \n  \nAbout the Speaker: Dr. Swagat Mishra did his PhD from IUCAA\, Pune under the supervision of Prof. Varun Sahni in the year 2020. His doctoral thesis\, "Some aspects of accelerating Universe: from Inflation to Dark energy" received the Justice Oak Outstanding Thesis Award in 2021 awarded by ASI India. He is presently a postdoctoral fellow at the Center for Astronomy and Particle Theory\, University of Nottingham. His research interests are Theoretical Cosmology\, Early Universe Physics\, QFT in curved spacetime and Effective Field Theories. 
URL:https://www.ashoka.edu.in/event/physics-seminar/
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