Results 61 to 70 of about 2,291,734 (314)

Decoupling in an expanding universe: boundary RG-flow affects initial conditions for inflation

, 2004
We study decoupling in FRW spacetimes, emphasizing a Lagrangian description throughout. To account for the vacuum choice ambiguity in cosmological settings, we introduce an arbitrary boundary action representing the initial conditions.
A. Strominger, A.A. Starobinsky, A.J. Hamilton, C. Grosse-Knetter, C.P. Burgess, C.P. Burgess, C.P. Burgess, C.P. Burgess, D. Deutsch, D.J.H. Chung, E. Witten, F. Larsen, F. Larsen, G. Barton, Gary Shiu, H. Collins, H. Collins, J. Martin, J. Martin, J.P. van der Schaar, Jan Pieter van der Schaar, K. Goldstein, K. Goldstein, K. Graham, Koenraad Schalm, M. Bastero-Gil, M.B. Einhorn, M.B. Einhorn, N. Kaloper, N.D. Birrell, O. Aharony, P. Candelas, R. Easther, R.G. Leigh, R.H. Brandenberger, R.L. Jaffe, S. Shankaranarayanan, T. Banks, T. Tanaka, U.H. Danielsson, V. Bozza, Y. Aghababaie   +41 more
core   +2 more sources

String Theory on Thin Semiconductors : Holographic Realization of Fermi Points and Surfaces(30 Years of Mathematical Methods in High Energy Physics-In Honor of Professor Tohru Eguchi's 60th Birthday-) [PDF]

, 2009
I make a novel contact between string theory and degenerate fermion dynamics in thin semiconductors. Utilizing AdS/CFT correspondence in string theory and tunability of coupling parameters in condensed matter systems, I focus on the possibilities testing
S. Rey
semanticscholar   +1 more source

Consistent effective description of nucleonic resonances in an unitary relativistic field-theoretic way [PDF]

, 1998
High energy strong interaction physics is successfully described by the local renormalizable gauge theory called Quantum-Chromo-Dynamics (QCD) with quarks and gluons as ``elementary'' degrees of freedom, while intermediate energy strong interaction ...
Kleefeld, F.
core   +2 more sources

Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies [PDF]

Journal of Cosmology and Astroparticle Physics
Early observations with the James Webb Space Telescope (JWST) have revealed the existence of an unexpectedly large abundance of extremely massive galaxies at redshifts z ≳ 5: these are in tension with the predictions not only of the standard ΛCDM ...
N. Menci, Shahnawaz A. Adil, Upala Mukhopadhyay, A. A. Sen, S. Vagnozzi   +4 more
semanticscholar   +1 more source

Optimization of target grouping in distributive stereotactic radiosurgery using the excel evolutionary solver

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose Distributive stereotactic radiosurgery (dSRS) is a form of fractionation where groups of metastases are treated with a full single‐fraction dose on different days. The challenge with dSRS is determining optimal target groupings to maximize the distance between targets treated in the same fraction.
Chester Ramsey, Samuel Gallemore, Joseph Bowling   +2 more
wiley   +1 more source

Particle Physics in a Season of Change [PDF]

, 2012
A digest of my opening remarks at the 2011 Hadron Collider Physics Symposium.
arxiv   +1 more source

AAPM‐RSS Medical Physics Practice Guideline 9.b: SRS‐SBRT

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract The purpose of this Medical Physics Practice Guideline (MPPG) is to describe the minimum level of medical physics support deemed prudent for the practice of linear‐accelerator, photon‐based (linac) stereotactic radiosurgery (SRS), and stereotactic body radiation therapy (SBRT) services.
Eileen Cirino, Stanley H. Benedict, Pamela J. Dupre, Per H. Halvorsen, Grace Gwe‐Ya Kim, Meral L. Reyhan, Christopher W. Schneider, Lei Wang, Carl P. Weaver, Sua Yoo   +9 more
wiley   +1 more source

High‐precision localization of radiation isocenter using Winston‐Lutz test: Impact of collimator angle, phantom position, and field size

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study aimed to evaluate the impact of collimator angle, ball bearing (BB) phantom position, and field size on the accuracy of Winston‐Lutz (WL) test–derived radiation isocenters. Methods WL tests were performed on four TrueBeam linear accelerators.
Weiliang Du
wiley   +1 more source

Muon Collider Physics at Very High Energies [PDF]

, 2000
Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.
arxiv   +1 more source

Improving VMAT dose calculation accuracy and planning quality via a GPU‐accelerated Fourier transform dose calculation algorithm

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Background Inverse planning typically utilizes fast, less accurate dose calculation algorithms during the iterative optimization process, thus leading to dose calculation errors (DCEs) and suboptimal plans that often require dose normalization and/or plan re‐optimization.
Kenny Guida, Chaoqiong Ma, Joy Patel, Krishna Reddy, H. Harold Li   +4 more
wiley   +1 more source