Zobrazeno 1 - 10
of 2 646
pro vyhledávání: '"Nanopoulos, A."'
Based on a previously derived superstring model possessing a cosmological sector that mimics Starobinsky inflation, we analyze several questions addressed in the recent literature: the generation of an effective $R^2$-term, the stability of the sgold
Externí odkaz:
http://arxiv.org/abs/2410.16541
We introduce an in-depth study of an unprobed pMSSM region offering a natural solution to dark matter. Since the 1980s this region has been referred to as the "bulk", consisting of sub 200 GeV neutralinos and right-handed smuons. The bulk satisfies r
Externí odkaz:
http://arxiv.org/abs/2409.09474
Autor:
Basilakos, Spyros, Nanopoulos, Dimitri V., Papanikolaou, Theodoros, Saridakis, Emmanuel N., Tzerefos, Charalampos
In light of NANOGrav data we provide for the first time possible observational signatures of Superstring theory. Firstly, we work with inflection-point inflationary potentials naturally realised within Wess-Zumino type no-scale Supergravity, which gi
Externí odkaz:
http://arxiv.org/abs/2409.02936
Autor:
Hooft, Gerard t, Phillips, William D, Zeilinger, Anton, Allen, Roland, Baggott, Jim, Bouchet, Francois R, Cantanhede, Solange M G, Castanedo, Lazaro A M, Cetto, Ana Maria, Coley, Alan A, Dalton, Bryan J, Fahimi, Peyman, Franks, Sharon, Frano, Alex, Fry, Edward S, Goldfarb, Steven, Langanke, Karlheinz, Matta, Cherif F, Nanopoulos, Dimitri, Orzel, Chad, Patrick, Sam, Sanghai, Viraj A A, Schuller, Ivan K, Shpyrko, Oleg, Lidstrom, Suzy
Despite its amazing quantitative successes and contributions to revolutionary technologies, physics currently faces many unsolved mysteries ranging from the meaning of quantum mechanics to the nature of the dark energy that will determine the future
Externí odkaz:
http://arxiv.org/abs/2404.11724
Publikováno v:
Physical Review D 109, 115031 (2024)
We propose Generalized No-Scale Supergravity, the simplest scenario for Effective Super-Natural Supersymmetry, naturally solving the supersymmetry electroweak fine-tuning problem and including natural dark matter. A light right-handed slepton bulk re
Externí odkaz:
http://arxiv.org/abs/2310.03622
Autor:
Basilakos, Spyros, Nanopoulos, Dimitri V., Papanikolaou, Theodoros, Saridakis, Emmanuel N., Tzerefos, Charalampos
The no-scale flipped SU(5) superstring framework constitutes a very promising paradigm for physics below the Planck scale providing us with a very rich cosmological phenomenology in accordance with observations. In particular, it can accommodate Star
Externí odkaz:
http://arxiv.org/abs/2309.15820
Autor:
Basilakos, Spyros, Nanopoulos, Dimitri V., Papanikolaou, Theodoros, Saridakis, Emmanuel N., Tzerefos, Charalampos
In this Letter, we derive for the first time a characteristic three-peaked GW signal within the framework of no-scale Supergravity, being the low-energy limit of Superstring theory. We concentrate on the primordial gravitational wave (GW) spectrum in
Externí odkaz:
http://arxiv.org/abs/2307.08601
Recent BICEP/Keck data on the cosmic microwave background, in combination with previous WMAP and Planck data, impose strong new constraints on the tilt in the scalar perturbation spectrum, $n_s$, as well as the tensor-to-scalar ratio, $r$. These cons
Externí odkaz:
http://arxiv.org/abs/2112.04466
In a recent paper, we identified a cosmological sector of a flipped $SU(5)$ model derived in the free fermionic formulation of the heterotic superstring, containing the inflaton and the goldstino superfields with a superpotential leading to Starobins
Externí odkaz:
http://arxiv.org/abs/2112.01211
We consider proton decay and $g_\mu - 2$ in flipped SU(5) GUT models. We first study scenarios in which the soft supersymmetry-breaking parameters are constrained to be universal at some high scale $M_{in}$ above the standard GUT scale where the QCD
Externí odkaz:
http://arxiv.org/abs/2110.06833