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Beyond ΛCDM

Exploring Alternatives to the Standard Cosmological Paradigm

  • Book
  • © 2018

Overview

Authors:
  1. Sownak Bose

    1. Harvard–Smithsonian Center for Astrophysics, Cambridge, USA

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  • Nominated as an outstanding PhD thesis by the University of Durham, England
  • Employs state-of-the-art, high-resolution cosmological simulations
  • Confronts the predictions of theoretical models with observations using a sophisticated semi-analytic model of galaxy formation
  • Provides an in-depth study of two of the most central problems in modern cosmology—the nature of dark matter (DM) and dark energy (DE)

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (7 chapters)

  1. Front Matter

    Pages i-xxxiv
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  2. Introduction

    • Sownak Bose
    Pages 1-11

  3. Cosmology with Sterile Neutrinos

    1. Front Matter

      Pages 13-13
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    2. Statistical Properties of Warm Dark Matter Haloes

      • Sownak Bose
      Pages 15-50

    3. Substructure and Galaxy Formation in Warm Dark Matter Simulations

      • Sownak Bose
      Pages 51-75

    4. Reionisation in Sterile Neutrino Cosmologies

      • Sownak Bose
      Pages 77-100

  4. Numerical Simulations of f(R) Gravity

    1. Front Matter

      Pages 101-101
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    2. Testing the Quasi-static Approximation in f(R) Gravity Simulations

      • Sownak Bose
      Pages 103-138

    3. Speeding up N-Body Simulations of Modified Gravity: Chameleon Screening Models

      • Sownak Bose
      Pages 139-159

  5. Conclusions and Future Work

    1. Front Matter

      Pages 161-161
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    2. Conclusions and Future Work

      • Sownak Bose
      Pages 163-172

  6. Back Matter

    Pages 173-181
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Keywords

About this book

This book employs computer simulations of ‘artificial’ Universes to investigate the properties of two popular alternatives to the standard candidates for dark matter (DM) and dark energy (DE). It confronts the predictions of theoretical models with observations using a sophisticated semi-analytic model of galaxy formation. Understanding the nature of dark matter (DM) and dark energy (DE) are two of the most central problems in modern cosmology. While their important role in the evolution of the Universe has been well established—namely, that DM serves as the building blocks of galaxies, and that DE accelerates the expansion of the Universe—their true nature remains elusive. In the first half, the authors consider ‘sterile neutrino’ DM, motivated by recent claims that these particles may have finally been detected. Using sophisticated models of galaxy formation, the authors find that future observations of the high redshift Universe and faint dwarf galaxies in the Local Group can placestrong constraints on the sterile neutrino scenario. In the second half, the authors propose and test novel numerical algorithms for simulating Universes with a ‘modified’ theory of gravity, as an alternative explanation to accelerated expansion. The authors’ techniques improve the efficiency of these simulations by more than a factor of 20 compared to previous methods, inviting the readers into a new era for precision cosmological tests of gravity.

Authors and Affiliations

  • Harvard–Smithsonian Center for Astrophysics, Cambridge, USA

    Sownak Bose

About the author

Originally from Kolkata, India, the author completed his undergraduate Masters degree in Physics from the University of Oxford in 2013. Following this, he obtained a PhD in Astrophysics from Durham University, under the supervision of Prof. Carlos Frenk, Dr. Baojiu Li and Prof. Adrian Jenkins. Currently, he is a ITC Postdoctoral Fellow at the Harvard-Smithsonian Center for Astrophysics in Cambridge, MA (USA).

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