6.3k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kyoto UniversityJP16 papers
- Tokyo Institute of TechnologyJP10 papers
- Inter-University Centre for Astronomy and AstrophysicsIN9 papers
- The University of TokyoJP9 papers
- Jamia Millia IslamiaIN8 papers
- Özyeğin UniversityTR8 papers
- Yukawa Institute for Theoretical PhysicsJP8 papers
- Advanced Science Research CenterJP7 papers
- Japan Atomic Energy AgencyJP7 papers
- Astronomical Observatory of RomeIT6 papers
- The University of OsakaJP5 papers
- Jožef Stefan InstituteSI4 papers
12 papers · 1 filter
Inflation and dark energy arising from geometrical tachyons
Sudhakar Panda, M. Sami, Shinji Tsujikawa
We study the motion of a BPS D3-brane in the NS5-brane ring background. The radion field becomes tachyonic in this geometrical set up. We investigate the potential of this geometri…
Reconstruction of general scalar-field dark energy models
Shinji Tsujikawa
The reconstruction of scalar-field dark energy models is studied for a general Lagrangian density , where is a kinematic term of a scalar field . We implement the c…
Dynamics of assisted quintessence
Soo A Kim, Andrew R Liddle, Shinji Tsujikawa
We explore the dynamics of assisted quintessence, where more than one scalar field is present with the same potential. For potentials with tracking solutions, the fields naturally…
Tetraquark and Pentaquark Systems in Lattice QCD
F. Okiharu, T. Doi, H. Ichie +5
Motivated by the recent experimental discoveries of multi-quark candidates, e.g., the , we study multi-quark systems in lattice QCD. First, we perform accurate mass meas…
de Sitter thermodynamics and the braneworld
Gianluca Calcagni
The de Sitter thermodynamics of cosmological models with a modified Friedmann equation is considered, with particular reference to high-energy Randall-Sundrum and Gauss-Bonnet bran…
Inflation Dynamics and Reheating
Bruce A. Bassett, Shinji Tsujikawa, David Wands
We review the theory of inflation with single and multiple fields paying particular attention to the dynamics of adiabatic and entropy/isocurvature perturbations which provide the…
Phantom damping of matter perturbations
Luca Amendola, Shinji Tsujikawa, M. Sami
Cosmological scaling solutions are particularly important in solving the coincidence problem of dark energy. We derive the equations of sub-Hubble linear matter perturbations for a…
Flow equations in generalized braneworld scenarios
Gianluca Calcagni, Andrew R. Liddle, Erandy Ramirez
We discuss the flow equations in the context of general braneworld cosmologies with a modified Friedmann equation, for either an ordinary scalar field or a Dirac-Born-Infeld tachyo…
Dark energy and cosmological solutions in second-order string gravity
Gianluca Calcagni, Shinji Tsujikawa, M Sami
We study the cosmological evolution based upon a -dimensional action in low-energy effective string theory in the presence of second-order curvature corrections and a modulus sc…
The fate of (phantom) dark energy universe with string curvature corrections
M. Sami, Alexey Toporensky, Peter V. Tretjakov +1
We study the evolution of (phantom) dark energy universe by taking into account the higher-order string corrections to Einstein-Hilbert action with a fixed dilaton. While the prese…
Coupled dark energy: Towards a general description of the dynamics
Burin Gumjudpai, Tapan Naskar, M. Sami +1
In dark energy models of scalar-field coupled to a barotropic perfect fluid, the existence of cosmological scaling solutions restricts the Lagrangian of the field $\vp$ to $p=X g(X…
Properties of singularities in (phantom) dark energy universe
Shin'ichi Nojiri, Sergei D. Odintsov, Shinji Tsujikawa
The properties of future singularities are investigated in the universe dominated by dark energy including the phantom-type fluid. We classify the finite-time singularities into fo…