V H Satheeshkumar

Total Page:16

File Type:pdf, Size:1020Kb

V H Satheeshkumar V H SATHEESHKUMAR Departamento de F´ısicaTe´orica,Instituto de F´ısica,Universidade do Estado do Rio de Janeiro, Rua S~aoFrancisco Xavier 524, Maracan~a,Rio de Janeiro, RJ 20550-900, Brazil ? +55-21-96947-0095 [email protected] https://sites.baylor.edu/vh satheeshkumar/ RESEARCH INTERESTS • Black hole entropy and Hawking radiation • Singularities, black holes and gravitational collapse • Fundamental symmetries of nature and their interconnection • Very early universe, trans-Planckian cosmology and inflation • Heat kernel techniques in general relativity, quantum field theory and quantum gravity EDUCATION Ph.D. (Theoretical Physics) Baylor University, Waco, Texas, USA. [May 2015] - Dissertation: Aspects of Black Holes in Gravitational Theories with Broken Lorentz and Diffeomorphism Symmetries - Advisor: Dr. Anzhong Wang M.Phil. (Physics) University of Hyderabad, Hyderabad, India. [2006] - Thesis: Gravity, Extra Dimensions and Supernovae - Advisor: Dr. P. K. Suresh M.Sc. (Astronomy) Osmania University, Hyderabad, India. [2004] B.Sc. (Physics, Mathematics & Computer Science) Yuvaraja's College, Mysore, India. [2001] EMPLOYMENT Postdoctoral Fellow - Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil. [July 2015 { Present] Graduate Teaching Assistant - Baylor University, Waco, TX, USA. [August 2009 { May 2015] Graduate Research Assistant - Baylor University, Waco, TX, USA. [Summer 2012, Summer 2013] Lecturer - SBM Jain College of Engineering, Bangalore, India. [April 2008 { August 2009] Physics Teacher - Jain International Residential School, Bangalore, India. [June 2006 { August 2009] Lecturer (part-time) - Tej Academy for IIT-JEE, Hyderabad, India. [June 2004 { May 2006] ACADEMIC DISTINCTIONS 1. CAPES Postdoctoral Fellowship at Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil, 2015-16. 2. Outstanding Dissertation of the Year 2014{15 among all STEM departments at Baylor University. 3. Outstanding Physics Dissertation of the Year 2014{15 at Baylor University. 4. Elected by Baylor University to Who's Who Among Students in American Universities & Colleges 2014. 1 5. Nominated four times by Baylor Graduate School for the Outstanding Graduate Student Instructor Award for Fall 2011, Fall 2012, Fall 2013 and Spring 2014. 6. Honorable Mention in the Gravity Research Foundation Essay Competition 2013. 7. Summer Research Fellowship at Institute of Mathematical Sciences (IMSc), Chennai, jointly awarded by the Indian Academy of Sciences, the Indian National Academy of Sciences and the National Science Academy, India during April{June 2007. - Mentor: Dr. Romesh K. Kaul 8. Vacation Students' Program at Inter University Center for Astronomy and Astrophysics (IUCAA), Pune during May{June 2003 - Supervisor: Dr. Naresh K. Dadhich PUBLICATIONS Refereed Journals 1. \Static and rotating universal horizons and black holes in gravitational theories with broken Lorentz invariance" (K Lin and A Wang) submitted for publication [arXiv:1603.05708] 2. \Null dust solution in Hoˇrava-Lifshitz gravity" (with O Goldoni, M F A da Silva, R Chan, and J F Villas da Rocha) submitted for publication [arXiv:1603.00782] 3. \Quantization of 2D Hoˇrava gravity: non-projectable case" (with B-F Li and A Wang) Physical Review D 93, 064043 (2016) [arXiv:1511.06780] 4. \Spectral dimension of bosonic string theory" (with D G Moore) Physical Review D 90, 024075 (2014) [arXiv:1407.3002] 5. \The fate of Lorentz frame in the vicinity of black hole singularity"∗ (with D G Moore) International Journal of Modern Physics D 22, 1342026 (2013) [arXiv:1305.7221] * Received Honorable Mention in the Gravity Research Foundation Essay Competition 2013 6. \Gravitational collapse in Hoˇrava-Lifshitz theory" (with J Greenwald, J Lenells & A Wang) Physical Review D 88, 024044 (2013) [arXiv:1304.1167] 7. \Black holes and global structures of spherical spacetimes in Hoˇrava-Lifshitz theory" (with J Greenwald, J Lenells, J.X. Lu, & A Wang) Physical Review D 84 084040 (2011) [arXiv:1105.4259] 8. \Black holes, compact objects and solar system tests in non-relativistic general covariant theory of gravity" (with J Greenwald & A Wang) Journal of Cosmology and Astroparticle Physics 1012 007 (2010) [arXiv:1010.3794] 9. \Understanding gravity: some extra dimensional perspectives" (with P K Suresh) ISRN Astronomy and Astrophysics Volume 2011 (2011), Article ID 131473 [gr-qc/0605152] 10. \Gravity and Large Extra Dimensions" (with P K Suresh) Advances in Astronomy 189379 (2011) [hep-th/0606194] 11. \Bounds on large extra dimensions from photon fusion process in SN1987A" (with P K Suresh) Journal of Cosmology and Astroparticle Physics 02, 011 (2008) [arXiv:0805.3429] 12. \Plasmon annihilation into Kaluza-Klein graviton: new astrophysical constraints on Large Extra Di- mensions?" (with P K Das & P K Suresh) Physical Review D 78, 063011 (2008) [arXiv:0801.1269] Conference Proceedings 1. \Supernovae as Probes of Extra Dimensions" (with P K Suresh & P K Das) American Institute of Physics Conference Proceedings 939: 258{262 (2007) [arXiv:0706.3551]. 2 TALKS (outside home institution) 1. \A new metric for a radiating star in General Relativity" at the Third Argentinian-Brazilian Meeting on Gravitation, Astrophysics, and Cosmology (GrACo III) at the Centro Brasileiro de Pesquisas F´ısicas (CBPF), Rio de Janeiro, Brazil, from April 26{29, 2016. 2. \Some surprises in General Relativity" at IV Oficina Carioca de Cosmologia e Gravita¸c~ao organized by Observat´orioNacional, Rio de Janeiro, Brazil during April 18{20, 2016. 3. \Gravitational collapse in Hoˇrava-Lifshitz theory" at XXVII Texas Symposium on Relativistic Astro- physics organized by University of Texas at Dallas, Dallas, TX during December 8{13, 2013. 4. \Theoretical limits on the (non-)existence of Lorentz frame near black hole singularity" at 7th Gulf Coast Gravity Meeting organized by University of Mississippi (Ole Miss), Oxford, MS during April 19{20, 2013. 5. \Non-Gaussianity from HL gravity" [poster] at Inflationary Theory and Its Confrontation with Data in the Planck Era organized by Aspen Center for Physics, Aspen, CO during January 30 { February 4, 2012. 6. \Black holes in general covariant theory of quantum gravity" at 27th Pacific Coast Gravity Meeting organized by California Institute of Technology (Caltech), Pasadena, CA during January 18{19, 2011. 7. \Gravity and large extra dimensions" at International Symposium Experimental Gravitation organized by Tata Institute of Fundamental Research, Mumbai at Cochin during January 5{9, 2009. 8. \Supernovae as probes of extra dimensions" at International Workshop on Theoretical High Energy Physics organized by Indian Institute of Technology (IIT), Roorkee during March 15{20, 2007. 9. \Supernovae and extra dimensions" at Young Astronomer's Meet 2005 organized by Inter-University Center for Astronomy and Astrophysics (IUCAA) and National Center of Radio Astrophysics (NCRA), Pune, during November 29 { December 2, 2005. CONFERENCES, SCHOOLS and WORKSHOPS 1. Third Argentinian-Brazilian Meeting on Gravitation, Astrophysics, and Cosmology (GrACo III) at the Centro Brasileiro de Pesquisas F´ısicas (CBPF), Rio de Janeiro, Brazil, from April 26{29, 2016. 2. IV Oficina Carioca de Cosmologia e Gravita¸c~aoat Observat´orioNacional, Rio de Janeiro, Brazil during April 18{20, 2016. 3. Strings 2014 at Princeton University and the Institute for Advanced Study, Princeton, NJ during June 23{27, 2014. 4. Prospects in Theoretical Physics (PiTP) 2014 on String Theory at the Institute for Advanced Study, Princeton, NJ during June 16{20, 2014. 5. XXVII Texas Symposium on Relativistic Astrophysics organized by University of Texas, Dallas, TX during December 8{13, 2013. 6. 7th Gulf Coast Gravity Meeting at University of Mississippi (Ole Miss), Oxford, MS during April 19{20, 2013. 7. Inflationary Theory and Its Confrontation with Data in the Planck Era at Aspen Center for Physics, Aspen, CO during January 30 { February 4, 2012. 8. Aspects of Inflation at Texas A & M University, College Station, TX during April 8{10, 2011. 9. 27th Pacific Coast Gravity Meeting at California Institute of Technology (Caltech), Pasadena CA during March 18{19, 2011. 10. ADM-50: A Celebration of Current GR Innovation at Texas A & M University, College Station, TX during November 7{8, 2009. 11. Texas Cosmology Network Meeting - 2009 at University of Texas, Austin, TX during October 29{30, 2009. 3 12. XXVII Meeting of Astronomical Society of India at Indian Institute of Astrophysics, Bangalore during February 18{20, 2009. 13. International Symposium on Experimental Gravitation organized by Tata Institute of Fundamental Research, Mumbai at Cochin during January 5{9, 2009. 14. X Workshop in High Energy Physics Phenomenology (WHEPP-X) at the Institute of Mathematical Sciences (IMSc), Chennai during January 2{3, 2008. 15. SERC Preparatory School in Theoretical High Energy Physics at the Banaras Hindu University, Varanasi during November 26 { December 15, 2007. 16. International Workshop on Theoretical High Energy Physics at Indian Institute of Technology (IIT), Roorkee during March 15{20, 2007. 17. XXV Meeting of Astronomical Society of India at Osmania University, Hyderabad during February 7{9, 2007. 18. Young Astronomers' Meet 2005 organized by Inter University Center for Astronomy and Astrophysics (IUCAA) and National Center of Radio Astrophysics (NCRA), Pune during November 29 { December 2, 2005. 19. Einstein's Legacy jointly organized by Indian Institute of Science (IISc), Bangalore and St. Pois College, Hyderabad during October
Recommended publications
  • ABSTRACT Investigation Into Compactified Dimensions: Casimir
    ABSTRACT Investigation into Compactified Dimensions: Casimir Energies and Phenomenological Aspects Richard K. Obousy, Ph.D. Chairperson: Gerald B. Cleaver, Ph.D. The primary focus of this dissertation is the study of the Casimir effect and the possibility that this phenomenon may serve as a mechanism to mediate higher dimensional stability, and also as a possible mechanism for creating a small but non- zero vacuum energy density. In chapter one we review the nature of the quantum vacuum and discuss the different contributions to the vacuum energy density arising from different sectors of the standard model. Next, in chapter two, we discuss cosmology and the introduction of the cosmological constant into Einstein's field equations. In chapter three we explore the Casimir effect and study a number of mathematical techniques used to obtain a finite physical result for the Casimir energy. We also review the experiments that have verified the Casimir force. In chapter four we discuss the introduction of extra dimensions into physics. We begin by reviewing Kaluza Klein theory, and then discuss three popular higher dimensional models: bosonic string theory, large extra dimensions and warped extra dimensions. Chapter five is devoted to an original derivation of the Casimir energy we derived for the scenario of a higher dimensional vector field coupled to a scalar field in the fifth dimension. In chapter six we explore a range of vacuum scenarios and discuss research we have performed regarding moduli stability. Chapter seven explores a novel approach to spacecraft propulsion we have proposed based on the idea of manipulating the extra dimensions of string/M theory.
    [Show full text]
  • Unification of the Maxwell- Einstein-Dirac Correspondence
    Unification of the Maxwell- Einstein-Dirac Correspondence The Origin of Mass, Electric Charge and Magnetic Spin Author: Wim Vegt Country: The Netherlands Website: http://wimvegt.topworld.center Email: [email protected] Calculations: All Calculations in Mathematica 11.0 have been printed in a PDF File Index 1 “Unified 4-Dimensional Hyperspace 5 Equilibrium” beyond Einstein 4-Dimensional, Kaluza-Klein 5-Dimensional and Superstring 10- and 11 Dimensional Curved Hyperspaces 1.2 The 4th term in the Unified 4-Dimensional 12 Hyperspace Equilibrium Equation 1.3 The Impact of Gravity on Light 15 2.1 EM Radiation within a Cartesian Coordinate 23 System in the absence of Gravity 2.1.1 Laser Beam with a Gaussian division in the x-y 25 plane within a Cartesian Coordinate System in the absence of Gravity 2.2 EM Radiation within a Cartesian Coordinate 27 System under the influence of a Longitudinal Gravitational Field g 2.3 The Real Light Intensity of the Sun, measured in 31 our Solar System, including Electromagnetic Gravitational Conversion (EMGC) 2.4 The Boundaries of our Universe 35 2.5 The Origin of Dark Matter 37 3 Electromagnetic Radiation within a Spherical 40 Coordinate System 4 Confined Electromagnetic Radiation within a 42 Spherical Coordinate System through Electromagnetic-Gravitational Interaction 5 The fundamental conflict between Causality and 48 Probability 6 Confined Electromagnetic Radiation within a 51 Toroidal Coordinate System 7 Confined Electromagnetic Radiation within a 54 Toroidal Coordinate System through Electromagnetic-Gravitational
    [Show full text]
  • Anzhong Wang Late Cosmic Acceleration of the Universe in Superstring/M Theory (Physics / Arts and Sciences)
    Anzhong Wang Late Cosmic Acceleration of the Universe in Superstring/M Theory (Physics / Arts and Sciences) One of the remarkable discoveries over the past decade is that currently our universe is in its accelerating expansion phase, first observed from Type Ia supernovae measurements [1]. Cross checks from the cosmic microwave background radiation (CMB) and large scale all confirm this [2]. While the late cosmic acceleration of the universe is now well established, the underlying physics remains a complete mystery [3]. Since the precise nature and origin of the acceleration have profound implications, understanding them is one of the biggest challenges of modern cosmology. As the Dark Energy Task Force (DETF) stated [4]: `` Most experts believe that nothing short of a revolution in our understanding of fundamental physics will be required to achieve a full understanding of the cosmic acceleration." Within the framework of general relativity (GR), a simple model is to re-introduce a tiny positive cosmological constant (CC), which was first introduced by Einstein in 1917 to construct a static universe. With the discovery of the expansion of the universe in 1929 by E. Hubble, the rationale for the CC evaporated. Fifty years later, Zel'dovich (1968) realized that the CC, mathematically equivalent to the vacuum energy, cannot simply be dismissed. In quantum field theory, the vacuum state is filled with virtual particles and their effects have been measured in many physical processes. However, estimates for the energy density associated with the quantum vacuum are at least 60 orders of magnitude too large, a major embarrassment known as the CC problem [5].
    [Show full text]
  • ABSTRACT Brane Cosmology in String/M-Theory And
    ABSTRACT Brane Cosmology in String/M-Theory and Cosmological Parameters Estimation Qiang Wu, Ph.D. Chairperson: Anzhong Wang, Ph.D. In this dissertation, I mainly focus on two subjects: (I) highly e®ective and e±cient parameter estimation algorithms and their applications to cosmology; and (II) the late cosmic acceleration of the universe in string/M theory. In Part I, after developing two highly successful numerical codes, I apply them to study the holographical dark energy model and ¤CMD model with curvature. By ¯tting these models with the most recent observations, I ¯nd various tight constraints on the parameters involved in the models. In part II, I develop the general formulas to describe orbifold branes in both string and M theories, and then systematical study the two most important issues: (1) the radion stability and radion mass; and (2) the localization of gravity, the e®ective 4D Newtonian potential. I ¯nd that the radion is stable and its mass is in the order of GeV, which is well above the current observational constraints. The gravity is localized on the TeV brane, and the spectra of the gravitational Kluza-Klein towers are discrete and have a mass gap of TeV. The contributions of high order Yukawa corrections to the Newtonian potential are negligible. Using the large extra dimensions, I also show that the cosmological constant can be lowered to its current observational value. Applying the formulas to cosmology, I study several models in the two theories, and ¯nd that a late transient acceleration of the universe is a generic feature of our setups.
    [Show full text]
  • Universe and MDPI Editorial Procedure 2019 CCNU - Cfa@USTC Junior Cosmology Symposium
    Universe and MDPI Editorial Procedure 2019 CCNU - cfa@USTC Junior Cosmology Symposium Miranda Song-宋茜 MDPI 27 April 2019 Outline 1. Universe Introduction - Journal Scope - Journal Statistics - Editorial Board - Special Issues - Journal Awards - Author Benefits 2. MDPI Editorial Process 2 Part 1: Universe Introduction 3 Universe is a peer-reviewed open access journal focused on gravitation, cosmology, particle physics, field theory and relativistic astrophysics, published monthly online by MDPI. Journal Scope • special and general relativity, quantum gravity, string theory and M-theory, modified theories of gravity, gravitational waves • physical cosmology, black hole physics, physical property of vacuum • foundations of quantum mechanics, classical field theory, quantum field theory • theoretical particle physics, fundamental interactions, standard model and beyond • mathematical physics, conservation laws, symmetry and symmetry breaking • physical constants • philosophy and history of physics 4 Journal Statistics Universe (ISSN: 2218-1997) ➢ Founded: 2015 (Volumes: 5) ➢ 373 articles published (to 31 March 2019) ➢ Cited in Astrophysics Data System: 3.6 ➢ From Submission to Publication: 46 days (median values for papers published in this journal in the second half of 2018) ➢ Indexing: SCIE-Science Citation Index Expanded (The journal will receive its first impact factor in June 2019); ADS-Astrophysics Data System (in it, Universe papers have been cited 3.6 times on average); Scopus (Elsevier) 5 Editorial Board Associate Editor-in-Chief
    [Show full text]
  • Orbifold Branes in String/M-Theory and Their Cosmological Applications
    Orbifold branes in string/M-Theory and their cosmological applications Anzhong Wang∗ GCAP-CASPER, Physics Department, Baylor University, Waco, TX 76798-7316 (Dated: November 21, 2018) In this brief report, we summarize our recent studies in brane cosmology in both string theory 1 and M-Theory on S /Z2. In such setups, we find that the radion is stable and its mass, with a very conservative estimation, can be of the order of 0.1 ∼ 0.01 GeV. The hierarchy problem can be addressed by combining the large extra dimension, warped factor, and tension coupling mechanisms. Gravity is localized on the visible brane, and the spectrum of the gravitational Kaluza-Klein (KK) modes is discrete and can have a mass gap of TeV. The corrections to the 4D Newtonian potential from the higher order gravitational KK modes are exponentially suppressed. Applying such setups to cosmology, we find that a late transient acceleration of the universe seems to be the generic feature of the theory, due to the interaction between branes and bulk. A bouncing early universe is also rather easily realized. PACS numbers: 98.80.Cq,11.25Mj,11.25.Y6 Introduction: A long-standing problem in physics is the nomena has been found [2]. More important, they are hierarchy problem, which has been one of the main driv- experimentally testable at high-energy particle colliders ing forces of physics beyond the Standard Model (SM) and in particular at the newly-built Large Hadron Col- during the last few decades [1]. The problem can be for- lider (LHC) [6]. mulated as the large difference in magnitudes between Another important problem is the late cosmic acceler- 16 the Planck and electroweak scales, Mpl/MEW ≃ 10 , ation of the universe, first observed from Type Ia super- 16 where Mpl(∼ 10 T eV ) denotes the four-dimensional novae measurements [7], and confirmed subsequently by Planck mass, and MEW (∼ T eV ) the electroweak scale.
    [Show full text]
  • ABSTRACT Classification of Cosmological Models in Einstein's
    ABSTRACT Classi¯cation of Cosmological Models in Einstein's General Theory of Gravity Te Ha, M.S. Chairperson: Anzhong Wang, Ph.D. In this thesis, I ¯rst review the fundamentals of Hot Big Bang cosmology, the observational cosmology and the late accelerating universe. Then I systematically study the evolution of the Friedmann-Robertson-Walker (FRW) universe with a cosmological constant ¤ and a perfect fluid that has the equation of state p = w½, and classify all the solutions into various cases, where p and ½ are the pressure and energy density of the fluid, and w is a constant. In each case the main properties of the evolution of the universe are studied in detail, including the periods of deceleration or acceleration, and the existence of big bang, big crunch, and big rip singularities. Finally, I mention some future work along the direction laid down in this thesis. Classi¯cation of Cosmological Models in Einstein's General Theory of Gravity by Te Ha, B.S. A Thesis Approved by the Department of Physics Gregory A. Benesh, Ph.D., Chairperson Submitted to the Graduate Faculty of Baylor University in Partial Ful¯llment of the Requirements for the Degree of Master of Science Approved by the Thesis Committee Anzhong Wang, Ph.D., Chairperson Lorin Swint Matthews, Ph.D. Klaus Kirsten, Ph.D. Accepted by the Graduate School August 2009 J. Larry Lyon, Ph.D., Dean Page bearing signatures is kept on ¯le in the Graduate School. Copyright °c 2009 by Te Ha All rights reserved TABLE OF CONTENTS LIST OF FIGURES v ACKNOWLEDGMENTS vii DEDICATION viii 1 Hot Big Bang Cosmology 1 1.1 Relativistic Cosmology .
    [Show full text]
  • Arxiv:2105.14067V2 [Gr-Qc] 24 Jun 2021
    Phenomenological implications of modified loop cosmologies: an overview Bao-Fei Li 1;2∗, Parampreet Singh1y, and Anzhong Wang3z 1 Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803, USA 2 Institute for Theoretical Physics & Cosmology, Zhejiang University of Technology, Hangzhou, 310032, China 3 GCAP-CASPER, Department of Physics, Baylor University, Waco, TX, 76798-7316, USA (Dated: June 25, 2021) In this paper, we first provide a brief review of the effective dynamics of two recently well-studied models of modified loop quantum cosmologies (mLQCs), which arise from different regularizations of the Hamiltonian constraint and show the robustness of a generic resolution of the big bang singularity, replaced by a quantum bounce due to non-perturbative Planck scale effects. As in loop quantum cosmology (LQC), in these modified models the slow-roll inflation happens generically. We consider the cosmological perturbations following the dressed and hybrid approaches and clarify some subtle issues regarding the ambiguity of the extension of the effective potential of the scalar perturbations across the quantum bounce, and the choice of initial conditions. Both of the modified regularizations yield primordial power spectra that are consistent with current observations for the Starobinsky potential within the framework of either the dressed or the hybrid approach. But differences in primordial power spectra are also identified among the mLQCs and LQC. In particular, for mLQC-I, striking differences arise between the dressed and hybrid approaches in the infrared and oscillatory regimes. While the differences between the two modified models can be attributed to differences in the Planck scale physics, the permissible choices of the initial conditions and the differences between the two perturbation approaches have been reported for the first time.
    [Show full text]
  • Ho\V {R} Ava Gravity at a Lifshitz Point: a Progress Report
    Hoˇrava Gravity at a Lifshitz Point: A Progress Report Anzhong Wang∗ Institute for Advanced Physics & Mathematics, Zhejiang University of Technology, Hangzhou 310032, China GCAP-CASPER, Department of Physics, Baylor University, Waco, Texas 76798-7316, USA (Dated: April 5, 2017) Hoˇrava gravity at a Lifshitz point is a theory intended to quantize gravity by using techniques of traditional quantum field theories. To avoid Ostrogradsky's ghosts, a problem that has been plaguing quantization of general relativity since the middle of 1970's, Hoˇrava chose to break the Lorentz invariance by a Lifshitz-type of anisotropic scaling between space and time at the ultra- high energy, while recovering (approximately) the invariance at low energies. With the stringent observational constraints and self-consistency, it turns out that this is not an easy task, and various modifications have been proposed, since the first incarnation of the theory in 2009. In this review, we shall provide a progress report on the recent developments of Hoˇrava gravity. In particular, we first present four most-studied versions of Hoˇrava gravity, by focusing first on their self-consistency and then their consistency with experiments, including the solar system tests and cosmological observations. Then, we provide a general review on the recent developments of the theory in three different but also related areas: (i) universal horizons, black holes and their thermodynamics; (ii) non-relativistic gauge/gravity duality; and (iii) quantization of the theory. The studies in these areas can be generalized to other gravitational theories with broken Lorentz invariance. CONTENTS The last particle predicted by SM, the Higgs boson, was finally observed by Large Hadron Collider in 2012 I.
    [Show full text]
  • ABSTRACT Orbifold Branes in String Theory and Their Applications
    ABSTRACT Orbifold Branes in String Theory and Their Applications to Cosmology Michael J. Devin, Ph.D. Advisor: Anzhong Wang, Ph.D. This dissertation contains two distinct compactification schemes of 10-dimen- sional string theory, as well as some of the implications of one of these schemes for string cosmology. The first half of this work begins with a brief overview of cosmology and goes through constructing and then analyzing the first model, inspired by the work of Santos and Wang. The second part consists of an attempt to construct similar models using the the popular warped conifold compactification scheme, as well as an appendix with a variant of the first model and its derivation. The work concludes with the observation that the latter attempt does not admit solutions of the same form, and that the variant model in the appendix is degenerate to previously studied KK-type models. Orbifold Branes in String Theory and Their Applications to Cosmology by Michael J. Devin, B.S. A Dissertation Approved by the Department of Physics Gregory A. Benesh, Ph.D., Chairperson Submitted to the Graduate Faculty of Baylor University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Approved by the Dissertation Committee Anzhong Wang, Ph.D., Chairperson Gregory A. Benesh, Ph.D. Gerald B. Cleaver, Ph.D. Walter M. Wilcox, Ph.D. Jonatan C. Lenells, Ph.D. Accepted by the Graduate School August 2011 J. Larry Lyon, Ph.D., Dean Page bearing signatures is kept on file in the Graduate School. Copyright c 2011 by Michael J. Devin All rights reserved TABLE OF CONTENTS LIST OF FIGURES v LIST OF TABLES vi 1 Introduction to Modern Cosmology 1 1.1 Three Principles .
    [Show full text]
  • Spherically Symmetric Exact Vacuum Solutions in Einstein-Aether Theory
    universe Article Spherically Symmetric Exact Vacuum Solutions in Einstein-Aether Theory Jacob Oost 1,2, Shinji Mukohyama 3,4 and Anzhong Wang 1,5,* 1 GCAP-CASPER, Physics Department, Baylor University, Waco, TX 76798-7316, USA; [email protected] 2 Odyssey Space Research, 1120 NASA Parkway, Houston, TX 77058, USA 3 Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan; [email protected] 4 Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa 277-8583, Japan 5 Institute for Theoretical Physics & Cosmology, Zhejiang University of Technology, Hangzhou 310023, China * Correspondence: [email protected] Abstract: We study spherically symmetric spacetimes in Einstein-aether theory in three different coordinate systems, the isotropic, Painlevè-Gullstrand, and Schwarzschild coordinates, in which the aether is always comoving, and present both time-dependent and time-independent exact vacuum solutions. In particular, in the isotropic coordinates we find a class of exact static solutions characterized by a single parameter c14 in closed forms, which satisfies all the current observational constraints of the theory, and reduces to the Schwarzschild vacuum black hole solution in the decoupling limit (c14 = 0). However, as long as c14 6= 0, a marginally trapped throat with a finite non-zero radius always exists, and on one side of it the spacetime is asymptotically flat, while on the other side the spacetime becomes singular within a finite proper distance from the throat, although the geometric area is infinitely large at the singularity.
    [Show full text]
  • CASPER Newsletterwinter2003
    Astrophysics & Space Science Theory Group Astrophysics & Space Science Theory Group Early Universe Cosmology & Strings Group Early Universe Cosmology & Strings Group Hypervelocity Impacts & Dusty Plasmas Lab Hypervelocity Impacts & Dusty Plasmas Lab Space Science Lab Space Science Lab CASPER Adds Anzhong Wang, Meihong Sun, and Tibra Ali CASPER Promotional Video and Brochure Three new scholars join the CASPER faculty, bringing with represents an outgrowth of his thesis entitled “M-theory on seven them such diverse research interests as critical phenomena, black holes, manifolds with fluxes.” The first of Dr. Ali’s two current research projects string theory, turbulent boundary layers, and Contour Dynamics. is in collaboration with Dr. Gerald Cleaver. Dr. Ali and Dr. Cleaver are The long-awaited CASPER video is now available in several formats for Newest to Baylor is Anzhong Wang who holds his doctorate from the attempting to find an M-theoretic formulation of the heterotic free informational and recruiting purposes. CASPER contracted with KWBU University of Ioannina in Greece. His extensive teaching and research fermionic string theory that Dr. Cleaver and his collaborators have to produce the digital promotional video with footage from all areas of experience includes appointments in Brazil, Greece and China. He is been working on for a number of years. currently working on three different research topics. Dr. Wang’s first Additionally, Dr. Ali is working on M-theory as it relates to the CASPER endeavor. The video was distributed to every high school area of interest concerns critical phenomena, the phenomena exhibited the seven manifolds of G2 holonomy. In recent years String/M-theorists within a six country area and highlights CASPER research, REU, RET, near the threshold of black hole formation during gravitational collapse.
    [Show full text]