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I discuss the implications of spontaneously broken spacetime symmetries in context of Condensed Matter Physics (CMP) and High Energy Physics (HEP). Startingwith a minimal set of assumptions, a lot can be learned about complicated many body quantum systems using the ideas from Coset Construction and Eff ective Field theories (EFT). The fact that any symmetry of the full theory must be realized, linearly or non-linearly, in the infra red (IR) limit puts strong constraints on the low energy dynamics of any EFT. In this work, I have mainly focused on the Fermiliquid theory (FLT), which in some sense is the simplest CMP system. Even though the phenomenology of FLT has been worked out extensively, its analysis from thepoint of view of spacetime symmetry breaking has shed some new light on the theory and led to the development of a novel idea the so-called Dynamical Inverse Higgs Mechanism, which is a new way of non-linear realization of broken spacetime symmetries. This technique is developed in this work in great detail. I also worked on a diff erent, yet more intuitive method of understanding broken spacetime symmetries by using the spacetime symmetry algebra. This is related to a well known concept in EFTs, called the Reparametrization Invariance (RPI). I work out several examples of the constraints that arise in HEP EFTs from RPI and how they can also be derived from the symmetry algebra. Lastly in the appendix, I also provide some detailed calculations related to the main body of my thesis anda few other applications of Coset Construction besides Fermi liquids.

The purpose of this paper is to explore cooperative ETD efforts in USA, U.K, India and China that have larger education systems and larger number of higher education graduates. Also to analysis ETD movement of India in comparison. This paper starts with introduction of cooperative ETD movement in countries in four countries, namely USA, U.K, India, China then proceed with an effort to discuss comparative analysis of findings. ETD movement has been adopted by various countries around the world. This study found that there is a requirement of national level ETD service in each country for the swift growth of ETDs around the world. The authors found that universities level ETD programs are the key factors to promote national level ETD service. This paper gives the recommendation for further analysis to explore the solutions to excel cooperative ETD movement in various countries around the world.ETD development in various countries has been explored by various studies but comparative analysis of cooperative ETD service of various nations have not been done. It will be an effort to explore national electronic thesis service of USA, U.K, India and China.