Results 21 to 30 of about 648,849 (327)
Geometric Bremsstrahlung in the Early Universe [PDF]
, 1995 We discuss photon emission from particles decelerlated by the cosmic expansion. This can be interpretated as a kind of bremsstrahlung induced by the Universe geometry.
Futamase, T. +3 more
core +2 more sources
Conditions for spontaneous homogenization of the Universe [PDF]
, 2010 The present-day Universe appears to be homogeneous on very large scales. Yet when the casual structure of the early Universe is considered, it becomes apparent that the early Universe must have been highly inhomogeneous.
A. Krasiński +33 more
core +1 more source
Horndeski model in nonlinearly realized supergravity
Journal of High Energy Physics, 2019 We construct the Horndeski Lagrangian within non-linearly realized super- gravity. We will show that the bosonic part of the Horndeski Lagrangian can be realized. Gravitino naturally couples to Horndeski sector in a super-covariant way.
Yusuke Yamada, Jun’ichi Yokoyama
doaj +1 more source
Higgs as heavy-lifted physics during inflation
Journal of High Energy Physics, 2019 Signals of heavy particle production during inflation are encoded as nonanalytic momentum scaling in primordial non-Gaussianity. These non-analytic signatures can be sourced by Standard Model particles with a modified Higgs scale uplifted by the slow ...
Yi-Peng Wu
doaj +1 more source
Particle asymmetries in the early universe [PDF]
, 2010 The total lepton asymmetry $l=\sum_f l_f$ in our universe is only poorly constrained by theories and experiments. It might be orders of magnitudes larger than the observed baryon asymmetry $b\simeq {\cal O}(10^{-10})$, $|l|/b \leq {\cal O}(10^{9})$.
Boeckel +19 more
core +1 more source
Extra Dimensions in the Early Universe [PDF]
, 1999 We investigate the possible occurrence of extra spatial dimensions (D = 3+epsilon) in the early universe. A detailed calculation is presented which shows that the crucial signal is the apparent inequality of the cosmological Z-term between matching Lyman
Douglas J. Buettner +4 more
core +2 more sources
Protostar Formation in the Early Universe [PDF]
, 2008 The nature of the first generation of stars in the Universe remains largely unknown. Observations imply the existence of massive primordial stars early in the history of the universe, and the standard theory for the growth of cosmic structure predicts ...
Hernquist, Lars +2 more
core +1 more source
Stellar Evolution in the Early Universe [PDF]
, 2008 Massive stars played a key role in the early evolution of the Universe. They formed with the first halos and started the re-ionisation. It is therefore very important to understand their evolution. In this paper, we describe the strong impact of rotation
André Maeder +22 more
core +1 more source
Mirror Neutrinos and the Early Universe
, 2000 I review the construction of the Exact Parity or Mirror Matter Model and explain how it solves the solar and atmospheric neutrino problems. The oscillation driven relic neutrino asymmetry amplification phenomenon is then used to demonstrate the ...
Volkas, Raymond R
core +1 more source
Large primordial fluctuations in gravitational waves from phase transitions
Journal of High Energy Physics, 2023 It is well-known that first-order phase transitions in the early universe can be a powerful source of observable stochastic gravitational wave backgrounds.
Arushi Bodas, Raman Sundrum
doaj +1 more source