Zobrazeno 1 - 10
of 167
pro vyhledávání: '"Edmund J. Copeland"'
Publikováno v:
Nuclear Physics B, Vol 916, Iss C, Pp 143-207 (2017)
This is the first of a series of detailed papers on string amplitudes with highly excited strings (HES). In the present paper we construct a generating function for string amplitudes with generic HES vertex operators using a fixed-loop momentum forma
Externí odkaz:
https://doaj.org/article/384125e0c4b447c39b244391d9c9f114
We carry out a thorough numerical examination of field theory monodromy inflation at strong coupling. We perform an MCMC analysis using a Gaussian likelihood, fitting multiparameter models using CMB constraints on the spectral index and the tensor to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d6f26fa618a031458bb0f92057816be0
Based on a binary tree model for the self intersection of cosmic string loops containing high harmonics we estimate the number of self-intersections of the parent and daughter loops and the associated cusp production to determine the most likely numb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8119ac45ff5954766c2f6f452ec440f6
Searches for primordial gravitational waves have resulted in constraints in a large frequency range from a variety of sources. The standard Cosmic Microwave Background (CMB) technique is to parameterise the tensor power spectrum in terms of the tenso
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b864f9139aaeeca9f488718947f5f87
Autor:
Edmund J. Copeland, Ana Achúcarro, Yvette Welling, Dong-Gang Wang, Gonzalo A. Palma, Oksana Iarygina
Publikováno v:
Physical Review D
Report No.: DESY-19-015
Physical review / D 102(2), 021302 (2020). doi:10.1103/PhysRevD.102.021302
Report No.: DESY-19-015
Physical review / D 102(2), 021302 (2020). doi:10.1103/PhysRevD.102.021302
Physical review / D D 102(2), 021302 (2020). doi:10.1103/PhysRevD.102.021302
We present a new class of two-field inflationary attractor models, known as shift-symmetric orbital inflation, whose behavior is strongly multifield but whose predictio
We present a new class of two-field inflationary attractor models, known as shift-symmetric orbital inflation, whose behavior is strongly multifield but whose predictio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3236036acc89701ea818dcf69ac6839
https://doi.org/10.1103/physrevd.102.021302
https://doi.org/10.1103/physrevd.102.021302
Autor:
Anastasios Avgoustidis, Finlay Noble Chamings, Anne M. Green, Alkistis Pourtsidou, Edmund J. Copeland
Publikováno v:
Physical Review D. 101
Models in which scalar field dark energy interacts with dark matter via a pure momentum coupling have previously been found to potentially ease the structure formation tension between early and late-Universe observations. In this paper, we explore th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3e7c48c72a31c198b841424cf495cb12
https://doi.org/10.1103/physrevd.101.043531
https://doi.org/10.1103/physrevd.101.043531
Oscillons are extremely long-lived, spatially-localized field configurations in real-valued scalar field theories that slowly lose energy via radiation of scalar waves. Before their eventual demise, oscillons can pass through (one or more) exceptiona
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f21f4976479149e224ad22a8bd11f50
A small fraction, $f$, of cosmic string loops can collapse to form Primordial Black Holes (PBHs). Constraints on the abundance of PBHs can therefore be used to constrain $f$. We update these calculations, taking into account the PBH extended mass fun
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a79d5ba69e697952b52edacf119d10b2
http://arxiv.org/abs/1911.12658
http://arxiv.org/abs/1911.12658
Publikováno v:
Physical review D, 2019, Vol.100(4), pp.043525 [Peer Reviewed Journal]
Physical Review D
Physical Review D
We investigate cosmological models in which dynamical dark energy consists of a scalar field whose present-day value is controlled by a coupling to the neutrino sector. The behaviour of the scalar field depends on three functions: a kinetic function,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bde3c245d62a7f4d382e7a28ac607a11
https://doi.org/10.1103/PhysRevD.100.043525
https://doi.org/10.1103/PhysRevD.100.043525
Publikováno v:
Physical Review D. 99
Scalar fields coupled to gravity through the Ricci scalar have been considered both as dark matter candidates and as a possible modified gravity explanation for galactic dynamics. It has recently been demonstrated that the dynamics of baryonic matter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d88f71576aac91c5f3b27964bc4f412
https://doi.org/10.1103/physrevd.99.043539
https://doi.org/10.1103/physrevd.99.043539