Results 41 to 50 of about 2,154,842 (330)

Investigating dark energy by electromagnetic frequency shifts [PDF]

Eur. Phys. J. Plus, 137, 253 (2022), 2022
The observed red shift $z$ might be composed by the expansion red shift $z_{\rm C}$ and an additional frequency shift $z_{\rm S}$, towards the red or the blue, by considering Extended Theories of Electromagnetism (ETE). Indeed, massive photon theories - the photon has a real mass as in the de Broglie-Proca theory or an effective mass as in the Standard-
arxiv   +1 more source

Solid-State Effects on the Optical Excitation of Push-Pull Molecular J-Aggregates by First-Principles Simulations [PDF]

, 2018
J-aggregates are a class of low-dimensional molecular crystals which display enhanced interaction with light. These systems show interesting optical properties as an intense and narrow red-shifted absorption peak (J-band) with respect to the spectrum of ...
Calzolari, Arrigo, Corni, Stefano, Guerrini, Michele   +2 more
core   +3 more sources

Extreme red shifted SERS nanotags [PDF]

Chemical Science, 2015
Extreme red-shifted nanotags have been developed and they provide effective SERS with picomolar detection limits when excited at 1280 nm.
Bedics, Matthew A., Kearns, Hayleigh, Cox, Jordan M., Mabbott, Sam, Ali, Fatima, Shand, Neil C., Faulds, Karen, Benedict, Jason B., Graham, Duncan, Detty, Michael R.   +9 more
openaire   +5 more sources

Neutrinos produced by ultrahigh-energy photons at high red shift [PDF]

, 2000
Some of the proposed explanations for the origin of ultrahigh-energy cosmic rays invoke new sources of energetic photons (e.g., topological defects, relic particles, etc.).
A. Borsellino, A. I. Nikishov, A. I. Nikishov, A. Mastichiadis, A. Vilenkin, A. Vilenkin, Alexander Kusenko, C. C. Steidel, C. T. Hill, C. T. Hill, C. T. Hill, D. Fargion, D. J. Bird, D. J. Bird, D. J. Chung, D. J. Chung, E. Waxman, E. Waxman, F. W. Stecker, F. W. Stecker, G. Gelmini, G. Gelmini, G. Pugliese, G. R. Farrar, G. R. Farrar, G. Sigl, G. T. Zatsepin, G. T. Zatsepin, J. J. Condon, J. P. Rachen, J. V. Jelley, K. Benakli, K. Benakli, K. Greisen, K. J. Mork, K. Mannheim, M. A. Lawrence, M. B. Hindmarsh, M. Birkel, M. Takeda, Marieke Postma, P. Bhattacharjee, P. Bhattacharjee, P. Gondolo, P. L. Biermann, P. Madau, R. J. Gould, R. J. Protheroe, R. J. Protheroe, R. J. Protheroe, R. W. Brown, S. Yoshida, T. Stanev, T. Weiler, V. A. Kuzmin, V. A. Kuzmin, V. A. Kuzmin, V. Anguelov, V. Berezinski, V. Berezinsky, V. Berezinsky, V. Berezinsky, V. Kuzmin, V. S. Berezinsky   +63 more
core   +2 more sources

Exploration of natural red-shifted rhodopsins using a machine learning-based Bayesian experimental design

Communications Biology, 2021
Inoue, Takeuchi and colleagues propose a machine learning-based protocol to screen rhodopsins for their likelihood to be red-shifted. After experimental verification, their tool shows remarkable success at identifying rhodopsins that showed red-shift ...
Keiichi Inoue, Masayuki Karasuyama, Ryoko Nakamura, Masae Konno, Daichi Yamada, Kentaro Mannen, Takashi Nagata, Yu Inatsu, Hiromu Yawo, Kei Yura, Oded Béjà, Hideki Kandori, Ichiro Takeuchi   +12 more
doaj   +1 more source

More complete discussion of the time-dependence of the non-static line element for the universe [PDF]

, 1930
In a previous article,(1) I have shown that a continuous transformation of matter into radiation, occurring throughout the universe, as postulated by the astrophysicists, would necessitate a nonstatic line element for the universe, and have shown that ...
Tolman, Richard C.
core   +1 more source

Spectral Red-Shift Versus Broadening from Photon and Dilepton Spectra [PDF]

, 2001
We estimate the photon and dilepton emission rates from hot hadronic matter with in-medium spectral shift and broadening of vector mesons. It is observed that both the WA98 photon data and CERES/NA45 dilepton data can be well reproduced with similar ...
Alam, Jan-e, Roy, Pradip, Sarkar, Sourav, Sinha, Bikash   +3 more
core   +2 more sources

Ultrafast Lasing Dynamics in a CsPbBr3 Perovskite Microplate

Advanced Photonics Research, 2022
The perovskite microlaser is a competitive candidate of light source for optical communication and integrated photonic circuits. Understanding the fundamental mechanism of lasing is crucial for the upcoming devices.
Ju Wang, Haoran Yu, Guodong Liu, Wei Liu, Yiqun Duan, Xue Cheng, Lun Dai, Shufeng Wang, Qihuang Gong   +8 more
doaj   +1 more source

Screening High-z GRBs with BAT Prompt Emission Properties [PDF]

, 2008
Detecting high-z GRBs is important for constraining the GRB formation rate, and tracing the history of re-ionization and metallicity of the universe.
David Palmer, Ed Fenimore, K. S. Dhuga, M. Galassi, M. Stamatikos, N. Gehrels, T. N. Ukwatta, T. Sakamoto   +7 more
core   +2 more sources

Cosmic Concordance and Quintessence [PDF]

, 2000
We present a comprehensive study of the observational constraints on spatially flat cosmological models containing a mixture of matter and quintessence --- a time varying, spatially inhomogeneous component of the energy density of the universe with ...
Affleck I., Barreiro T., Bartelmann M., Bertschinger E., Binetruy P., Blanton M., Bloomfield-Torres L. F., Bond J. R., Burles S., Burles S., Burles S., Croft R. A. C., Davis M., Evrard A. E., Fry J. N., Fukugita M., Hill C., Hill C., Hu W., Huey G., J. P. Ostriker, Leitch E. M., Limin Wang, Linde A., Malhotra S., McDonald P., Myers S. T., Oliveira-Costa A., Paul J. Steinhardt, Peacock J., R. R. Caldwell, Ratra B., Salaris M., Spergel D., Steinhardt P. J., Waga I., Weinberg D. H., Weiss N., Wetterich C.   +38 more
core   +2 more sources