Orientador: Prof. Dr. Ever Aldo Arroyo Montero / Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2015. / Nesta dissertação vamos utilizar da teoria de campos de cordas abertas para estudar a conjectura de Sen a partir do cálculo do potencial do táquion, que será obtido através do método numérico Level Truncation. Para isso, será feita uma introdução sobre teoria de cordas, passando por teoria de campos conforme em duas dimensões, a quantização BRST, as interações entre cordas abertas, e por fim estudar o formalismo da teoria de Witten de campos de cordas, desde a construção da ação cubica, até sua aplicação ao calcular o potencial do táquion "off-shell"para testar a conjectura de Sen e encontrar a relação entre o vácuo instável e o estável, a chamada condensação do táquion. / In this dissertation, it will be used the open string eld theory to study Sen's conjecture. We will calculate the tachyon potential through the numerical method known as the Level Truncation. To this purpose, we will study the following topics: an introduction to string theory through two dimensional conformal eld theory, BRST quantization, interactions between open strings and nally Witten's open cubic string eld theory together with its application which includes the calculation of the tachyon potential and the numerical test of Sen's conjecture. We are also going to analyze the relation between unstable and stable vacuum, namely, the tachyon condensation.

Doctor of Philosophy / This thesis analyses the concept of indigenous peoples’ right to self–determination within the international human rights system and explores viable avenues for the fulfilment of indigenous claims to self–determination through the design, implementation and evaluation of development policies. The thesis argues that development policy plays a crucial role in determining the level of enjoyment of self–determination for indigenous peoples. Development policy can offer an avenue to bypass nation states’ political unwillingness to recognize and promote indigenous peoples’ right to self–determination, when adequate principles and criteria are embedded in the whole policy process. The theoretical foundations of the thesis are drawn from two different areas of scholarship: indigenous human rights discourse and development economics. The indigenous human rights discourse provides the articulation of the debate concerning the concept of indigenous self–determination, whereas development economics is the field within which Amartya Sen’s capability approach is adopted as a theoretical framework of thought to explore the interface between indigenous rights and development policy. Foundational concepts of the capability approach will be adopted to construct a normative system and a practical methodological approach to interpret and implement indigenous peoples’ right to self–determination. In brief, the thesis brings together two bodies of knowledge and amalgamates foundational theoretical underpinnings of both to construct a normative and practical framework. At the normative level, the thesis offers a conceptual apparatus that allows us to identify an indigenous capability rights–based normative framework that encapsulates the essence of the principle of indigenous self–determination. At the practical level, the normative framework enables a methodological approach to indigenous development policies that serves as a vehicle for the fulfilment of indigenous aspirations for self–determination. This thesis analyses Australia’s health policy for Aboriginal and Torres Strait Islander peoples as an example to explore the application of the proposed normative and practical framework. The assessment of Australia’s health policy for Indigenous Australians against the proposed normative framework and methodological approach to development policy, allows us to identify a significant vacuum: the omission of Aboriginal traditional medicine in national health policy frameworks and, as a result, the devaluing and relative demise of Aboriginal traditional healing practices and traditional healers.

Doctor of Philosophy / This thesis analyses the concept of indigenous peoples’ right to self–determination within the international human rights system and explores viable avenues for the fulfilment of indigenous claims to self–determination through the design, implementation and evaluation of development policies. The thesis argues that development policy plays a crucial role in determining the level of enjoyment of self–determination for indigenous peoples. Development policy can offer an avenue to bypass nation states’ political unwillingness to recognize and promote indigenous peoples’ right to self–determination, when adequate principles and criteria are embedded in the whole policy process. The theoretical foundations of the thesis are drawn from two different areas of scholarship: indigenous human rights discourse and development economics. The indigenous human rights discourse provides the articulation of the debate concerning the concept of indigenous self–determination, whereas development economics is the field within which Amartya Sen’s capability approach is adopted as a theoretical framework of thought to explore the interface between indigenous rights and development policy. Foundational concepts of the capability approach will be adopted to construct a normative system and a practical methodological approach to interpret and implement indigenous peoples’ right to self–determination. In brief, the thesis brings together two bodies of knowledge and amalgamates foundational theoretical underpinnings of both to construct a normative and practical framework. At the normative level, the thesis offers a conceptual apparatus that allows us to identify an indigenous capability rights–based normative framework that encapsulates the essence of the principle of indigenous self–determination. At the practical level, the normative framework enables a methodological approach to indigenous development policies that serves as a vehicle for the fulfilment of indigenous aspirations for self–determination. This thesis analyses Australia’s health policy for Aboriginal and Torres Strait Islander peoples as an example to explore the application of the proposed normative and practical framework. The assessment of Australia’s health policy for Indigenous Australians against the proposed normative framework and methodological approach to development policy, allows us to identify a significant vacuum: the omission of Aboriginal traditional medicine in national health policy frameworks and, as a result, the devaluing and relative demise of Aboriginal traditional healing practices and traditional healers.